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Article

Recyclable Carbon-Based Hybrid Adsorbents Functionalized with Alumina Nanoparticles for Water Remediation

by
Mohamed A. Habila
1,*,
Zeid A. ALOthman
1,
Hussam Musaad Hakami
1,
Monerah R. ALOthman
2 and
Mohamed Sheikh
1
1
Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
2
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Author to whom correspondence should be addressed.
Crystals 2023, 13(4), 598; https://doi.org/10.3390/cryst13040598
Submission received: 15 February 2023 / Revised: 22 March 2023 / Accepted: 27 March 2023 / Published: 1 April 2023
(This article belongs to the Special Issue Feature Papers in Metal/Metal Oxide Nanoparticles)
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Abstract

:
Developing and improving adsorbent materials for wastewater treatment have become crucial for achieving recyclable water and keeping the environment safe. Carbon materials are modified with alumina (Al2O3) using various doping ratios and a solvothermal treatment. The process aims to combine the advantages of stable carbon and alumina materials with an efficient adsorbent for methylene blue removal. Fabricated materials including carbon and carbon/alumina derivatives were characterized with TEM, SEM, EDS, XRD, and FTIR, revealing successful surface modifications. The carbon materials exhibited pore diameters between 23 and 39 µm, while the modified ones showed pore diameters between 1.68 and 6.08 µm. The alumina nanoparticles were formed on a carbon surface with a particle size between 174 nm and 179 nm. Fabricated adsorbents were applied for the removal of methylene blue by adsorption at pH 4. The equilibrium and steady state adsorption stage was achieved after 2 h of reporting fast adsorption behavior. Low ratio carbon doping with alumina improved the adsorption capacity for methylene blue removal, while the excessive doping of carbon materials with alumina led to a reduction in adsorption efficiency. The application of pseudo-first-order and pseudo-second-order kinetic models indicated a fast adsorption mechanism, which agreed with the second-order model. The adsorption capacity for methylene blue was found to be 234 mg/g. Adsorption-isotherms including the Langmuir and Freundlich models were applied to investigate the adsorption mechanism. The results indicate that the Langmuir model fits with the adsorption data, which suggests a monolayer adsorption process.

1. Introduction

Water pollution with dye leads to many negative environmental impacts and has been considered as an industrial hazard to urbanization in recent decades [1,2,3,4,5]. Methylene blue possesses a heterocyclic chemical structure of the molecular formula C16H18N3SCl. Methylene blue has been extensively used for industrial coloring applications. Methylene blue dye applications extend to the coloring of paper, clothes, and leather. This leads to the contamination of industrial effluents and produces environmental, health, and surface water problems [6,7,8]. Methylene blue also has dangerous effects on ecosystems such as contaminating water resources and harming birds and animals. The most common side effects of consuming methylene blue are stomach upsets, diarrhea, vomiting, and bladder diseases. Symptoms also include turning urine or stools green-blue. Other dangerous side effects of methylene blue include dizziness, fainting, and fever. Individuals who are exposed to methylene blue should receive urgent medical attention to avoid complications or serious side effects [9,10].
Environmental regulation has led to the development of a number of wastewater treatment processes including photodegradation, bioremediation, adsorption, extraction, and ion exchange [11,12,13,14,15,16,17,18,19]. Among these processes, many advantages for wastewater purification via the adsorptive removal of methylene blue have been reported including easy processing and low initial cost establishment [20]. Adsorption refers to the physical adhesion of chemicals onto the surface of a solid. Active carbon adsorption is regarded as the most commonly used technique for water treatment due to its ease and reliability [21,22,23,24]. Many adsorption applications have been investigated for their methylene blue removal from wastewater; for example, Kempson et al. investigated the adsorption of methylene blue using a silica-based adsorbent and reported on the effective interaction between the silica structure and S atom in the methylene blue dye [25]. Abdelfatah et al. reported on the green fabrication of iron with the application of Ricinus communis extracts for methylene blue removal from wastewater [26]. Gunture et al. used diesel soot to fabricate carbon for the adsorption of dyes [27]. Maruthapandi et al. applied carbon dots for the free radical-based fabrication of poly(4,4′-diaminodiphenylmethane) for methylene blue adsorption [28]. Hu et al. improved the adsorption of methylene blue by applying thermoresponsive polymers in hybrid network hydrogels [29]. Dhar et al. applied graphene oxide anchored Mg–Al-layered double hydroxides for the efficient adsorption of heavy metals and dyes, and reported that the mechanism of adsorption includes interactions of the S (dye) with H–O, S (dye) with O, and N (dye) with O–H, which were expected to stabilize methylene blue onto the surface of the graphene oxide anchored Mg–Al-layered double hydroxides [30]. Gautam and Hooda prepared magnetic graphene oxide/chitin nanocomposites for dye adsorption including methylene blue, recording an adsorption capacity of 332.61 mg/g [31].
The production of activated carbon is based on the application of natural or carbon rich materials such as coal or a waste-derived carbon skeleton, which has been exposed to chemical and physical activation processes [32,33,34,35,36]. A high temperature is a fundamental factor in the process of carbonization activation; at up to 600–1200 °C, it consumes a high level of energy. However, activation preparation is considered to be a cost-dependent process, especially in large amounts. Hence, there is an urgent need for other cheap materials to be used in water treatment instead of carbon [37,38,39,40,41,42,43]. The trend for fabrication of low-cost adsorbent materials is oriented toward recycling and processing either industrial or agricultural waste in order to produce carbon for adsorption and wastewater treatment applications [35,44,45].
Alumina-based materials have been reported as proper adsorbents for environmental pollutants [46,47,48,49,50,51,52]. Alumina exhibits high stability with a porous character, which enhances water treatment through adsorption applications using high selectivity and low-cost processing [53,54,55,56]. Although the fabrication of alumina anchored carbon adsorbents has previously been investigated, significant research in the relation to methods of fabrication as well as their utilization for various industrial and environmental applications is urgently required. Therefore, this study aimed to fabricate aluminum oxide nanoparticles with recyclable carbon from a waste source as a hybrid adsorbent using a solvothermal process. We sought to investigate and optimize the removal of methylene blue by adsorption onto fabricated adsorbents. Furthermore, we sought to apply the adsorption data with various kinetic and equilibrium isotherm models.

2. Materials and Methods

2.1. Fabrication of Alumina Nanoparticles Anchored with Recyclable Carbon-Based Hybrid Adsorbents

The chemicals and reagents used were of a high purity analytical grade. Aluminum nitrate, ammonium hydroxide, and methylene blue were purchased from Sigma Aldrich, USA. Recyclable carbon from a waste source (palm waste) (C-A-0) was prepared as previously described in our published works [57]. Then, 5 g of carbon was dispersed in a beaker containing 200 mL deionized water including 1.25 g aluminum nitrate to produce C-A-25, and the process was repeated with another aluminum nitrate ratio of 2.5 g to produce C-A-50. The mixtures were stirred for 1 h before ammonium hydroxide was added to allow for the formation of aluminum hydroxide species on the carbon surfaces. The mixtures were then continuously stirred for an additional 3 h. The phases were separated by filtration. The carbon/aluminum species were heated in muffle furnaces in the near absence of oxygen at 600 °C to produce alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbents. The structure and surface characteristics were examined by transmission electron microscopy (TEM) images, which were obtained using a JEOL JEM-2100F electron microscope (Japan), and the surface morphology was characterized by a scanning electron microscope (SEM) (JEOL GSM-7600F, Tokyo, Japan). Fourier transform infrared (FTIR) spectra were recorded using the Bruker Vertex-80 spectrometer to identify surface groups. The powder X-ray diffraction (XRD) patterns of PANalytical X’Pert PRO MPD (Almelo, The Netherlands) were recorded with Ni-filtered Cu Kα radiation (45 kV, 40 mA). In addition, a Micromeritics Gemini VII 2390 Surface Area and Porosity (Norcross, GA, USA) was used for the surface area measurements.

2.2. Application Studies for Adsorption of Methylene Blue onto Alumina Nanoparticles Anchored with Recyclable Carbon-Based Hybrid Adsorbents

A total of 0.05 g of the recyclable carbon C-A-0 and alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbents (C-A-25 and C-A-50) were mixed with the methylene blue solution at a concentration of 50 mg/L. The pH of the mixture was adjusted to the desired pH using a phosphate buffer to adjust the pH of 2, 4, 5, 6, 7, and 8. The mixtures were separately shaken at 150 rpm for 2 h. Finally, the phases were separated by filtration and the methylene blue concentration was measured by UV–Visible spectroscopy. The adsorption capacity was calculated based on Equation (1):
qe = (C0 − Cf) · V/M,
where qe is the adsorption capacity (mg/g) of methylene blue onto the fabricated alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbents.
C0 refers to the initial concentration of methylene blue.
Cf is the final concentration of methylene blue after adsorption.
V is the volume of the adsorption medium.
M is the mass of the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbents (g).
To evaluate contact time effects, the same previous procedures were applied at time intervals of 15, 30, 45, 60, 120, 180, 240, 360, and 480 min. The adsorption conditions were adjusted to an adsorbent dose of 0.05 g, pH 4, and a methylene blue concentration of 50 mg/g. The adsorbent doses for C-A-0, C-A-25, and C-A-50 were similarly evaluated using 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8 g/L. The concentrations of methylene blue dye varied (25, 50, 80, 100, 150 and 200 mg/L) at pH 4, with a time of 120 min and an adsorbent dose of 0.05 and 150 rpm shaking conditions. Kinetic and isotherm models were used to assess the adsorbate/adsorbent equilibrium and predict the nature and rate of the adsorption process.

3. Results and Discussion

3.1. Characteristics of Alumina Nanoparticles Anchored with Recyclable Carbon-Based Hybrid Adsorbents

3.1.1. Microscopic Characterization of Alumina Nanoparticles Anchored with Recyclable Carbon-Based Hybrid Adsorbents

The surface structure of the prepared materials including the recyclable carbon (CA-0), alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-25 (CA-25), and alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-50 (CA-50) was examined by SEM, EDS, and TEM. The recyclable raw carbon materials exhibited a porous structure with the main surface elements C, O, and N (Figure 1 and Figure 2). In addition, a perforated surface is clearly visible in Figure 2, with a pore diameter between 23 and 39 µm. The surface area of raw carbon materials was 568.1 m2/g, which enabled an adsorption capacity for methylene blue removal of 201.8 mg/g (Table 1). The alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-25 (CA-25) showed the porous structure of carbon, with the addition of a surface structure from aluminum oxide, which was confirmed by the EDS analysis detecting C, O, N, and Al, which in turn were related to the presence of aluminum oxide on the surface of recyclable carbon materials (Figure 3 and Figure 4). In addition, the formed particles of alumina on the carbon surfaces exhibited particle sizes between 174 and 179 nm (Figure 4), which was lower than that for the activated raw carbon materials (Figure 2). The surface area of CA-25 materials was 249.7 m2/g, which enabled the adsorption capacity for the methylene blue removal of 234.4 mg/g, which was higher than that reported for activated raw carbon materials. Alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-50 (CA-50) (Figure 5 and Figure 6) were formed with a noticeable particulate on the surface of carbon, which was confirmed by the EDS analysis detecting C, O, N, and Al on the adsorbent surface. In addition, pores on the material surface were reported to have a diameter between 1.68 and 6.08 µm (Figure 6). The surface area of CA-50 materials was 247.0 m2/g, which enabled the adsorption capacity for the methylene blue removal of 156.4 mg/g, which was the lowest compared to that reported for CA-25 and activated raw carbon materials. Al-Gaashani et al. reported a similar modification for the fabrication of carbon adorned with AlO3 and Ag for the adsorption of molybdenum and arsenic, using the same morphological examination of the TEM and SEM images [58]. Such modifications of carbon materials make the surface rich with various electronegative atoms or compounds such as O, N, or Al; related oxide is expected to enhance interactions with pollutant molecules during adsorption and wastewater treatment, leading to the improved performance of adsorbent materials [55,59]. The results obtained in this study agree with the literature, which found that carbon pores are blocked at a higher doping ratio, leading to a lower porous structure but with higher efficiency [60,61].

3.1.2. Structural Characterization of Alumina Nanoparticles Anchored with Recyclable Carbon-Based Hybrid Adsorbents

The surface structure and functional groups of prepared materials including CA-0, CA-25, and CA-50 were examined by XRD (Figure 7). The detected XRD broad peak at two theta of 25 confirmed the amorphous structure of the samples due to the main carbon content of the materials. It has previously been reported that the carbon structures fabricated from waste sources exhibit an amorphous structure [62,63]. However, in cases of the modified samples of alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-25 (CA-25) and alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-50 (CA-50), some peaks were detected at about two theta of 27, 36, 38, 44, 54, 56, 61, and 68, corresponding to (012), (104), (110), (113), (024), (116), (018) and (214), respectively, due to the aluminum oxide modification [64,65]. In addition, low intensity peaks were reported for alumina modified samples due to the effect of the combination with a carbon structure.
The structure and functional groups on the surfaces of prepared materials—including the recyclable carbon (CA-0), alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-25 (CA-25) and alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent-50 (CA-50)—were examined by FTIR (Figure 8). The recyclable carbon (CA-0) surfaces did not exhibit functional groups The spectrum showed peaks related to OH groups at about 3400 to 3600 cm−1 due to adsorbed OH groups in the cases of CA-25 and CA-50. In addition, the CH aliphatic appeared to be between 2800 and 2900 cm−1. Furthermore, some peaks were detected at 518, 728 and 1060 cm−1 due to the Al-O of the aluminum oxide modification [65,66,67].

3.2. Adsorption Studies of Methylene Blue

3.2.1. Investigation of pH Effect

Methylene blue is considered to be a large, organic molecular weight pollutant, which is standard in nature and causes negative environmental impacts when released to water surfaces [19,21,32]. The adsorptive removal of methylene blue dye on the surface of an adsorbent is highly influenced by the surface charge and pH. We evaluated the pH effect on the tendency to adsorb methylene blue on the fabricated carbon and alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbents in the range between 2 and 8. As shown in Figure 9, this was at an initial concentration of 53.65 mg/L. It is clear from this figure that for AC-0, AC-25, and AC-50, the maximum adsorption was at pH 4, while at a pH between 5 and 8, we noticed a decrease in the adsorption capacity. The pH of the methylene blue aqueous solution had an effect on the AC-0, AC-25, and AC-50 surface binding sites as well as on the ionization and/or protonation process of methylene blue dye molecules. In addition, AC-25 showed the best adsorption capacity, which may be attributed to the presence of aluminum oxide nanoparticles, enhancing the adsorption of methylene blue compared to the original carbon; by increasing the amount of aluminum oxide nanoparticles, carbon pores are blocked, leading to a decrease in adsorption efficiency [68]. The adsorption efficiency depends on the surface area as well as the surface functional groups. The reported surface area for AC-0, AC-25, and AC-50 was 568.1 m2/g, 249.7 m2/g, and 247.0 m2/g, respectively (Table 1). The adsorption capacity in the case of AC-0 mainly depended on the surface area as the FTIR (Figure 8) showed no particular surface groups. while in the case of the modified adsorbents AC-25 and AC-50, the presence of Al-O and OH (Figure 8) may play the most important role for methylene blue adsorption. The mechanism of the adsorption of methylene blue onto AC-0, AC-25, and AC-50 may include various electronegative atoms in adsorbents such as Al–O and OH and N and S atoms in methylene blue dye. These forces may include dipole–dipole interactions and/or Van der Waals forces.

3.2.2. Effect of Adsorbent Dose, Contact Time, and Kinetic Model Evaluation

The effect of the CA-0, CA-25, and CA-50 doses on the adsorption process was studied in the range between 0.2 g/L and 0.8 g/L, as shown in Figure 10A. The maximum adsorption capacities were between 150 and 234 mg/g for CA-0, CA-25, and CA-50, with the lowest reported for CA-50. The adsorption capacity was decreased by increasing the adsorbent dose because of the presence of unused adsorbent surfaces [57,69].
The amount of MB adsorbed onto CA-0, CA-25, and CA-50 was examined to evaluate the effect of time between 15 min and 480 min (Figure 10B). The adsorption capacity of methylene blue onto CA-0, CA-25, and CA-50 was increased by changing the time from 15 to 120 min, and after 120 min, there was no observed increase because the equilibrium state was reached. In addition, the adsorption capacities were 83.3 mg/g, 99.2 mg/g, and 68.8 mg/g for CA-0, CA-25, and CA-50 at the equilibrium state, using an adsorbent dose of 0.05 g, methylene blue concentration of 50 mg/L, 25 °C, and shaking rate of 150 rpm. Moreover, we investigated the methylene blue uptake by adsorption onto CA-0, CA-25, and CA-50 toward kinetic behavior using the pseudo-first-order and the pseudo-second-order in order to illustrate the process rate [70,71,72,73]. The integrated Equation (2) of the pseudo-first-order is:
log(qe − qt) = log qe − k1t/2.303
where qe is the MB adsorption capacity at the time of equilibrium, while qt is related to the MB adsorption capacity at time t; k1 is the kinetic rate constant in case of applying the pseudo-first-order reaction (min−1) using the prepared materials of CA-0, CA-25, and CA-50.
Figure 10C shows the pseudo-first-order reaction as the relation of the log(qe − qt) as the y axes with t as the x axes, which enable the calculation of values k1 and qe (Table 2).
Furthermore, Equation (3) is the integrated pseudo-second-order kinetic equation:
t/qt = 1/kqe2 + (1/qe) × t
where t is the estimated contact time (min) and qe is in mg of methylene blue/g of the adsorbent including CA-0, CA-25, or CA-50. Moreover, qe2 (mg/g) refers to the amount of methylene blue that was adsorbed at the time of equilibrium.
Figure 10D shows the graph plotting of t/qt with t, which enables the calculation of qe and k (Table 2). From the obtained results, the experimental q and calculated q values were found to be in good correlation, revealing that the pseudo-second-order kinetic model was well-fitted for describing the adsorption data of methylene blue uptake onto CA-0, CA-25, and CA-50. Based on these results, the mechanism of methylene blue adsorption onto recyclable carbon and alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbents may include three steps: the migration of methylene blue in the solution, arrangement on the adsorbent surfaces, and migration in the entire pores of adsorbents. The three-phase adsorption process has been reported to be associated with second-order kinetic behavior during the adsorption of dyes and/or heavy metals. For example, El-Toni et al. reported the application of amino functionalized hollow core–mesoporous shell silica spheres for Pb(II), Cd(II), and Zn(II), which agreed with the second-order kinetics mechanism, with a suggestion of the three stage adsorption mechanism [74]. In addition, AlOthman et al. reported the removal of methylene blue using activated carbon from a mixed waste source, with suggested second-order kinetic model agreement [69].

3.2.3. Isotherm Studies

An analysis of the adsorption data in relation to concentration changes (25, 50, 80, 100, 150, and 200 mg/L) at a constant temperature, pH, shaking time, and adsorbent dose is important to assess the nature of the arrangement of the methylene blue adsorbed molecules on the fabricated CA-0, CA-25, and CA-50 carbon derivatives.
  • Langmuir isotherm [75]
The adsorption of methylene blue onto CA-0, CA-25, and CA-50 was studied using the Langmuir model, which is related to the monolayer formation of adsorbate around the applied CA-0, CA-25, and CA-50 adsorbents. The application of the isotherm model enables more information about the adsorption process and the behavior of the adsorbate during and after the process [76,77,78,79,80]. For example, the Langmuir model assumes that transmigration of the adsorbed ions is not assumed as happening on the plane surface. The application of Equation (4) for the Langmuir model for the uptake of methylene blue onto CA-0, CA-25, and CA-50 is presented in Figure 11A.
C e q e = ( 1 Q max 0 ) C e + 1 Q max 0 K L
where Qomax is the adsorption capacity in its maximum value (mg/g) for the monolayer adsorption-capacity of methylene blue onto CA-0, CA-25, and CA-50; Ce (mg/L) is the methylene blue concentration at equilibrium; qe (mg/g) is the quantity of methylene blue at equilibrium; KL (L/mg) is a constant associated with the affinity between an adsorbent and adsorbate.
The calculated correlation coefficient-R2 for the adsorption of methylene blue onto CA-0, CA-25, and CA-50 (Figure 11A) (Table 3) had high values, indicating that the Langmuir model’s assumption can be applied to describe the adsorption process.
  • Freundlich isotherm [81]
Equation (5) represents the Freundlich model:
Logqe = logK + 1/n logCe
where qe (mg/g) is the amount of methylene blue uptake onto CA-0, CA-25, and CA-50 at equilibrium, Ce (mg/L) is the methylene blue concentration at the time of equilibrium, KF (mg/g)/(mg/L)n is the Freundlich constant, and n is the Freundlich intensity parameter.
The K and n values were calculated by plotting log qe with log Ce, as presented in Figure 11B, and the results for applying the Freundlich model are set out in Table 3, which indicate that the model cannot be used for an applied adsorption process.
Disagreement of the adsorption data for methylene blue onto the fabricated recyclable carbon and alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbents indicates that multi-layer adsorption is not the suggested mechanism. In addition, the chances for a monolayer adsorption mechanism are greater, according to the Langmuir assumptions [74].

4. Conclusions

Wastewater treatment by the adsorption of methylene blue dye was achieved by modified recyclable carbon materials. The solvothermal process was successfully applied to anchor aluminum oxide onto recyclable carbon materials. The hybrid aluminum oxide/carbon structures showed efficient adsorption performance for the removal of methylene blue with adsorption capacities between 150 and 234 mg/g. The adsorption process was found to follow the pseudo-second-order kinetic model and Langmuir isotherm. The adsorbent (CA-0, CA-25, and CA-50) doses were effectively influenced by the adsorption capacity for methylene blue removal, with the highest adsorption capacity being 0.2 g/L. The fabricated hybrid aluminum oxide/carbon structures will enhance future research applications related to the functionalization of waste-derived carbon materials with different metal oxide nanoparticles, which may serve catalysis, photocatalytic, and environmental applications. In addition, the prepared hybrid aluminum oxide/carbon structures can be utilized for broader adsorption applications for the separation of gases, polychlorinated biphenyls, pesticides, hydrocarbon, and/or pharmaceutical wastes.

Author Contributions

Conceptualization, M.A.H., H.M.H. and M.R.A.; Formal analysis, M.A.H., M.R.A. and M.S.; Investigation, M.A.H. and H.M.H.; Methodology, Z.A.A., H.M.H. and M.S.; Resources, Z.A.A. and M.R.A.; Supervision, Z.A.A.; Validation, M.A.H., Z.A.A. and M.S.; Writing—original draft, M.A.H. and M.S.; Writing—review & editing, M.A.H. and Z.A.A. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the National Plan for Science, Technology, and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia, grant number 3-17-01-001-0012.

Data Availability Statement

Samples of the compounds are available from the authors.

Acknowledgments

The authors acknowledge the National Plan for Science, Technology, and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia for its grant with award number 3-17-01-001-0012.

Conflicts of Interest

The authors declare no conflict of interest.

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Crystals 13 00598 g001 550
Figure 1. The SEM (A,B) and EDS (C) of the raw carbon materials.
Figure 1. The SEM (A,B) and EDS (C) of the raw carbon materials.
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Crystals 13 00598 g002 550
Figure 2. The TEM of the raw carbon materials (A,B) are for different places in the same sample.
Figure 2. The TEM of the raw carbon materials (A,B) are for different places in the same sample.
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Crystals 13 00598 g003 550
Figure 3. The SEM (A,B) and EDS (C) of alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-25).
Figure 3. The SEM (A,B) and EDS (C) of alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-25).
Crystals 13 00598 g003
Crystals 13 00598 g004 550
Figure 4. Transmission electron microscopy (TEM) of the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-25) at various scales of (A) 200 nm and (B) 100 nm.
Figure 4. Transmission electron microscopy (TEM) of the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-25) at various scales of (A) 200 nm and (B) 100 nm.
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Crystals 13 00598 g005 550
Figure 5. The SEM (A,B) and EDS (C) of the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-50).
Figure 5. The SEM (A,B) and EDS (C) of the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-50).
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Crystals 13 00598 g006 550
Figure 6. Transmission electron microscopy (TEM) of the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-50) at various scales of (A) 200 nm and (B) 100 nm.
Figure 6. Transmission electron microscopy (TEM) of the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites (C-A-50) at various scales of (A) 200 nm and (B) 100 nm.
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Crystals 13 00598 g007 550
Figure 7. XRD analysis of (a) CA-0, (b) CA-25, and (c) CA-50.
Figure 7. XRD analysis of (a) CA-0, (b) CA-25, and (c) CA-50.
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Crystals 13 00598 g008 550
Figure 8. FTIR analysis of (a) recyclable carbon (CA-0), (b) CA-25, and (c) CA-50.
Figure 8. FTIR analysis of (a) recyclable carbon (CA-0), (b) CA-25, and (c) CA-50.
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Crystals 13 00598 g009 550
Figure 9. Influence of the initial pH of a methylene blue solution (50 mg/L) on the adsorption capacity of the prepared CA-0, CA-25, and CA-50 at a dose of 0.05 g, 25 °C and shaking rate of 150 rpm for 2 h.
Figure 9. Influence of the initial pH of a methylene blue solution (50 mg/L) on the adsorption capacity of the prepared CA-0, CA-25, and CA-50 at a dose of 0.05 g, 25 °C and shaking rate of 150 rpm for 2 h.
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Crystals 13 00598 g010 550
Figure 10. Optimization of the adsorption process of MB onto CA-0, CA-25, and CA-50: (A) adsorbent dose, (B) contact time, (C) pseudo-first-order kinetic model, and (D) pseudo-second-order kinetic model at a shaking rate of 150 rpm, 25 °C, and pH 4.
Figure 10. Optimization of the adsorption process of MB onto CA-0, CA-25, and CA-50: (A) adsorbent dose, (B) contact time, (C) pseudo-first-order kinetic model, and (D) pseudo-second-order kinetic model at a shaking rate of 150 rpm, 25 °C, and pH 4.
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Crystals 13 00598 g011 550
Figure 11. Equilibrium isotherms: (A) Langmuir isotherm and (B) Freundlich isotherm for the adsorption of initial methylene blue connotations of 25, 50, 80, 100, 150, and 200 mg/L onto CA-0, CA-25, and CA-50 at a dose of 0.5 g/L, 25 °C, and shaking rate of 150 rpm for 2 h.
Figure 11. Equilibrium isotherms: (A) Langmuir isotherm and (B) Freundlich isotherm for the adsorption of initial methylene blue connotations of 25, 50, 80, 100, 150, and 200 mg/L onto CA-0, CA-25, and CA-50 at a dose of 0.5 g/L, 25 °C, and shaking rate of 150 rpm for 2 h.
Crystals 13 00598 g011
Table
Table 1. Surface areas and adsorption capacities for the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites.
Table 1. Surface areas and adsorption capacities for the alumina nanoparticles anchored with recyclable carbon-based hybrid adsorbent nanocomposites.
Adsorbent Materials BET Surface Area
(m2/g)		Adsorption Capacity
(mg/g)
C-A-0568.1201.8
C-A-25249.7234.4
C-A-50247.0156.4
Table
Table 2. The kinetic parameters for the adsorption of methylene blue onto CA-0, CA-25, and CA-50.
Table 2. The kinetic parameters for the adsorption of methylene blue onto CA-0, CA-25, and CA-50.
Pseudo-First-OrderPseudo-Second-Order
Adsorbent Materialsqe,exp (mg/g)K1 (min−1)qe,cal (mg/g)R2k2 (g/mg·min)qe,cal (mg/g)R2
C-083.30.048159.40.7824.5 × 0−490.090.991
CA-199.20.02151.10.9751.08 × 10−3102.040.999
CA-268.80.038920.9816.68 × 10−472.990.995
Table
Table 3. Isotherm parameters for the adsorption of methylene blue onto CA-0, CA-25, and CA-50.
Table 3. Isotherm parameters for the adsorption of methylene blue onto CA-0, CA-25, and CA-50.
Langmuir ConstantsFreundlich Constants
KLbQ max.R2KFnR2
C-060.867.8181.80.992835.452.410.2471
CA-1161.291.01158.70.9796102.639.840.0847
CA-24.370.04192.30.938849.260.630.7415
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Habila, M.A.; ALOthman, Z.A.; Hakami, H.M.; ALOthman, M.R.; Sheikh, M. Recyclable Carbon-Based Hybrid Adsorbents Functionalized with Alumina Nanoparticles for Water Remediation. Crystals 2023, 13, 598. https://doi.org/10.3390/cryst13040598

AMA Style

Habila MA, ALOthman ZA, Hakami HM, ALOthman MR, Sheikh M. Recyclable Carbon-Based Hybrid Adsorbents Functionalized with Alumina Nanoparticles for Water Remediation. Crystals. 2023; 13(4):598. https://doi.org/10.3390/cryst13040598

Chicago/Turabian Style

Habila, Mohamed A., Zeid A. ALOthman, Hussam Musaad Hakami, Monerah R. ALOthman, and Mohamed Sheikh. 2023. "Recyclable Carbon-Based Hybrid Adsorbents Functionalized with Alumina Nanoparticles for Water Remediation" Crystals 13, no. 4: 598. https://doi.org/10.3390/cryst13040598

APA Style

Habila, M. A., ALOthman, Z. A., Hakami, H. M., ALOthman, M. R., & Sheikh, M. (2023). Recyclable Carbon-Based Hybrid Adsorbents Functionalized with Alumina Nanoparticles for Water Remediation. Crystals, 13(4), 598. https://doi.org/10.3390/cryst13040598

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