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New Materials and Catalysis in Environmental Protection
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New Materials and Catalysis in Environmental Protection

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 October 2024) | Viewed by 4966

Special Issue Editors

Dr. Jorge Sambeth

E-Mail Website
Guest Editor
Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. J. Ronco”, (CINDECA) CONICET-UNLP-CIC, 47 n° 257, 1900 La Plata, Buenos Aires, Argentina
Interests: heterogeneous catalysis; synthesis and characterization of materials; catalytic pyrolysis; catalytic cracking
Dr. Miguel Andrés Peluso

E-Mail Website
Guest Editor
Laboratorio UPL (CICPBA-UNLP), M.B. Gonnet, Buenos Aires, Argentina
Interests: recycling; batteries; PET; plastics, LIBS; lithium; glycolysis; catalysis; life cycle; circular economy; metal oxides; Zn; Mn
Special Issues, Collections and Topics in MDPI journals
Dr. Jorge Colman Lerner

E-Mail Website
Guest Editor
Centro de Investigación Y Desarrollo en Ciencias Aplicadas, CIC-CONICET-UNLP, La Plata, Argentina
Interests: heterogeneous catalysis; synthesis and characterization of materials; environmental catalysis

Special Issue Information

Dear Colleagues,

The increasing consumption of products and energy has significant implications for the environment. In order to address this challenge, it is crucial to develop novel materials, rethink existing ones, and explore the concept of a circular economy for metals, with a focus on producing hydrogen, fuels, and eliminating pollutants.

This Special Issue of Molecules aims to showcase the latest trends and future projections in the field while emphasizing the importance of rational material design to achieve sustainable development goals and mitigate negative environmental impacts. Specifically, this Special Issue will highlight the following key areas:

We invite researchers and experts from various disciplines to submit their original contributions and review papers to this Special Issue of Molecules. Together, we can foster innovation and drive progress towards a greener world.

We look forward to receiving your valuable contributions.

Dr. Jorge Sambeth
Prof. Dr. Miguel Andrés Peluso
Dr. Jorge Colman Lerner
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • catalytic materials for biofuel production and hydrogen generation
  • fuel production from plastic waste: novel catalysts and processes
  • advancements in reforming technologies: development of innovative catalysts
  • utilizing waste materials for the development of new functional materials
  • novel materials for efficient removal of pollutants from water and air

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Published Papers (5 papers)

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Research

14 pages, 3278 KiB  
Article
High-Efficiency and Fast Hydrogen Production from Sodium Borohydride: The Role of Adipic Acid in Hydrolysis, Methanolysis and Ethanolysis Reactions
by Savas Gurdal
Molecules 2024, 29(20), 4893; https://doi.org/10.3390/molecules29204893 - 16 Oct 2024
Viewed by 600
Abstract
In this study, hydrogen production through the hydrolysis, ethanolysis, and methanolysis reactions of NaBH4 using adipic acid as a catalyst was investigated for the first time. Adipic acid solutions were prepared with methanol and ethanol at concentrations of 0.1, 0.2, 0.3, 0.4, [...] Read more.
In this study, hydrogen production through the hydrolysis, ethanolysis, and methanolysis reactions of NaBH4 using adipic acid as a catalyst was investigated for the first time. Adipic acid solutions were prepared with methanol and ethanol at concentrations of 0.1, 0.2, 0.3, 0.4, and 0.5 M. In these reactions, NaBH4-MR (methanolysis) and NaBH4-ER (ethanolysis) reactions were carried out at 30, 40, and 50 °C with NaBH4 concentrations of 1.25%, 2.5%, and 5%. Hydrolysis reactions (NaBH4-HR) were conducted at 0.1 M under the same conditions. In the ethanolysis and methanolysis reactions at 30 °C, total hydrogen conversion was achieved at 0.3 M, 0.4 M, and 0.5 M. However, in the hydrolysis reactions, total hydrogen production was only obtained at 50 °C. It was observed that in the NaBH4-MR and NaBH4-ER reactions, total hydrogen conversion could be achieved within 4–5 s. The utilization of adipic acid as a catalyst for hydrogen production from NaBH4 through ethanolysis and methanolysis reactions is proposed as a highly efficient and fast method, characterized by impressive conversion rates. Full article
(This article belongs to the Special Issue New Materials and Catalysis in Environmental Protection)
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14 pages, 9691 KiB  
Article
RuNi/TiZr-MMO Catalysts Derived from Zr-Modified NiTi-LDH for CO-Selective Methanation
by Zhihui Li, Jiteng Ma and Xinfa Dong
Molecules 2024, 29(14), 3309; https://doi.org/10.3390/molecules29143309 - 13 Jul 2024
Viewed by 752
Abstract
CO-selective methanation (CO-SMET) is an efficient hydrogen-rich (H2-rich) gas purification technology for proton exchange membrane fuel cells. It is vital to develop suitable catalysts with good low-temperature activity for CO-SMET reactions. In this study, RuNi/TiZrx-mixed metal oxide (RuNi/TiZrx [...] Read more.
CO-selective methanation (CO-SMET) is an efficient hydrogen-rich (H2-rich) gas purification technology for proton exchange membrane fuel cells. It is vital to develop suitable catalysts with good low-temperature activity for CO-SMET reactions. In this study, RuNi/TiZrx-mixed metal oxide (RuNi/TiZrx-MMO) catalysts with different molar ratios of Zr/Ti, derived from a Zr-promoted NiTi-layered double hydroxide (NiTi-LDH) precursor were successfully prepared using the co-precipitation and wet impregnation methods. The RuNi/TiZr0.2-MMO catalyst possesses higher catalytic performance in a lower temperature window of 180–280 °C, which can reduce the CO concentration to be below 10 ppm. The characterization results obtained from XRD, BET, SEM, TEM, XPS, TPR, and TPD suggest that the addition of ZrO2 increases the surface area of the catalyst, improves the dispersion of metallic nanoparticles, increases the reducibility of Ni species on the RuNi/TiZr0.2-MMO catalyst’s surface, and enhances the adsorption and activation ability of CO, resulting in remarkable catalytic performance at lower reaction temperatures. Moreover, the RuNi/TiZr0.2-MMO catalyst demonstrated long-term catalytic stability and carbon resistance. Full article
(This article belongs to the Special Issue New Materials and Catalysis in Environmental Protection)
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15 pages, 5260 KiB  
Article
Nanoporous Au Behavior in Methyl Orange Solutions
by Andrea Pinna, Giorgio Pia, Nicola Melis, Mirko Prato, Maria Giorgia Cutrufello, Elisa Sogne, Andrea Falqui and Luca Pilia
Molecules 2024, 29(9), 1950; https://doi.org/10.3390/molecules29091950 - 24 Apr 2024
Viewed by 758
Abstract
Nanoporous (NP) gold, the most extensively studied and efficient NP metal, possesses exceptional properties that make it highly attractive for advanced technological applications. Notably, its remarkable catalytic properties in various significant reactions hold enormous potential. However, the exploration of its catalytic activity in [...] Read more.
Nanoporous (NP) gold, the most extensively studied and efficient NP metal, possesses exceptional properties that make it highly attractive for advanced technological applications. Notably, its remarkable catalytic properties in various significant reactions hold enormous potential. However, the exploration of its catalytic activity in the degradation of water pollutants remains limited. Nevertheless, previous research has reported the catalytic activity of NP Au in the degradation of methyl orange (MO), a toxic azo dye commonly found in water. This study aims to investigate the behavior of nanoporous gold in MO solutions using UV-Vis absorption spectroscopy and high-performance liquid chromatography. The NP Au was prepared by chemical removal of silver atoms of an AuAg precursor alloy prepared by ball milling. Immersion tests were conducted on both pellets and powders of NP Au, followed by examination of the residual solutions. Additionally, X-ray photoelectron spectroscopy and electrochemical impedance measurements were employed to analyze NP Au after the tests. The findings reveal that the predominant and faster process involves the partially reversible adsorption of MO onto NP Au, while the catalytic degradation of the dye plays a secondary and slower role in this system. Full article
(This article belongs to the Special Issue New Materials and Catalysis in Environmental Protection)
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13 pages, 6076 KiB  
Article
PVP Passivated δ-CsPbI3: Vacancy Induced Visible-Light Absorption and Efficient Photocatalysis
by Jianfeng Wen, Xin Du, Feng Hua, Yiting Gu, Ming Li and Tao Tang
Molecules 2024, 29(7), 1670; https://doi.org/10.3390/molecules29071670 - 8 Apr 2024
Viewed by 1057
Abstract
The aqueous instability of halide perovskite seriously hinders its direct application in water as a potential photocatalyst. Here, we prepared a new type of polyvinylpyrrolidone (PVP) passivated δ-CsPbI3 (δ-CsPbI3@PVP) microcrystal by a facile method. This material can be uniformly dispersed [...] Read more.
The aqueous instability of halide perovskite seriously hinders its direct application in water as a potential photocatalyst. Here, we prepared a new type of polyvinylpyrrolidone (PVP) passivated δ-CsPbI3 (δ-CsPbI3@PVP) microcrystal by a facile method. This material can be uniformly dispersed in water and stably maintain its crystal structure for a long time, breaking through the bottleneck of halide perovskite photocatalysis in water. Under visible light, δ-CsPbI3@PVP can almost completely photodegrade organic dyes (including Rhodamine B, methylene blue, and crystal violet) in only 20 min. The efficient photocatalytic activity is attributed to the enhanced visible light absorption arising from PbI2 defects in δ-CsPbI3@PVP and the intrinsic low photoluminescence quantum yield of δ-CsPbI3, which induces efficient light absorption and photocatalytic activity. We highlight δ-CsPbI3@PVP as an effective aqueous photocatalyst, and this study provides new insights into how to exploit the potential of halide perovskite in photocatalytic applications. Full article
(This article belongs to the Special Issue New Materials and Catalysis in Environmental Protection)
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15 pages, 6103 KiB  
Article
Monometallic and Bimetallic Catalysts Supported on Praseodymium-Doped Ceria for the Water–Gas Shift Reaction
by Weerayut Srichaisiriwech and Pannipa Tepamatr
Molecules 2023, 28(24), 8146; https://doi.org/10.3390/molecules28248146 - 18 Dec 2023
Cited by 1 | Viewed by 1228
Abstract
The water–gas shift (WGS) performance was investigated over 5%Ni/CeO2, 5%Ni/Ce0.95Pr0.05O1.975, and 1%Re4%Ni/Ce0.95Pr0.05O1.975 catalysts to decrease the CO amount and generate extra H2. CeO2 and Pr-doped CeO2 [...] Read more.
The water–gas shift (WGS) performance was investigated over 5%Ni/CeO2, 5%Ni/Ce0.95Pr0.05O1.975, and 1%Re4%Ni/Ce0.95Pr0.05O1.975 catalysts to decrease the CO amount and generate extra H2. CeO2 and Pr-doped CeO2 mixed oxides were synthesized using a combustion method. After that, Ni and Re were loaded onto the ceria support via an impregnation method. The structural and redox characteristics of monometallic Ni and bimetallic NiRe materials, which affect their water–gas shift performance, were investigated. The results show that the Pr addition into Ni/ceria increases the specific surface area, decreases the ceria crystallite size, and improves the dispersion of Ni on the CeO2 surface. Furthermore, Re addition results in the enhancement of the WGS performance of the Ni/Ce0.95Pr0.05O1.975 catalyst. Among the studied catalysts, the ReNi/Ce0.95Pr0.05O1.975 catalyst showed the highest catalytic activity, reaching 96% of CO conversion at 330°. It was established that the occurrence of more oxygen vacancies accelerates the redox process at the ceria surface. In addition, an increase in the Ni dispersion, Ni surface area, and surface acidity has a positive effect on hydrogen generation during the water–gas shift reaction due to favored CO adsorption. Full article
(This article belongs to the Special Issue New Materials and Catalysis in Environmental Protection)
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