Interactions between Earth Materials and Environmental Contaminants—from Structural Aspect to Mechanistic Interpretation

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (29 October 2023) | Viewed by 5824

Special Issue Editors

Geosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144, USA
Interests: crystal structure of clay minerals; interactions of crystals with environmental contaminants; environmental remediations using nano materials and Earth materials
Special Issues, Collections and Topics in MDPI journals
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Interests: crystal structure and surface reactivity of clay minerals; design and synthesis of nanostructured materials for energy and environmental science

Special Issue Information

Dear Colleagues,

The extensive use of Earth materials for environmental protection and contamination remediation resulted in numerous studies on their potential application. However, most studies were focused on practical aspects, such as the efficiency and capacity for contaminant removal and the evaluation of physical and chemical conditions that promote or diminish contaminant removal. Fewer studies have focused on the mechanisms of contaminant removal by Earth materials from structural aspects and at molecular scales. As such, this call for papers to the Special Issue on “Interactions between Earth Materials and Environmental Contaminants—From Structural Aspect to Mechanistic Interpretation” was targeted to elucidating fundamentals of interactions between the Earth materials and different types of contaminants. It is anticipated that the outcome of the Special Issue will be a collection of about 20 excellent articles. Most importantly, the results would help scientists, engineers, and citizens from around the globe to better use Earth materials to fight against different types of contamination and to achieve maximum environmental protection.

With regard to the contents of submitted manuscripts, anything pertaining to the interactions between contaminants and Earth materials will fit into the Special Issue well. However, as the title of the journal implies, the investigations between the crystal structure and the efficiency of contaminant removal are extremely important and thus the focus of this Special Issue. In addition to Earth materials, modification of Earth materials to increase their efficiency and productivity will also fall into this category. Moreover, the elucidation of Earth materials as additives for industrial applications from the perspective of mechanistic evaluation is also welcome. Manuscripts pertaining to deciphering the role of interactions between Earth materials and contaminants; instrumental characterization of raw and modified Earth materials; hybrid materials with Earth materials as part of the components; and integrated use of waste materials for environmental applications are also welcome. Overall, we anticipate a great turn out of cutting edge research on Earth materials for environmental applications from a crystal structural point of view.

We are looking forward to your contributions. I wish you a productive 2022

Dr. Zhaohui Li
Dr. Yi Zhou
Guest Editors

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Keywords

  • earth materials
  • clays
  • zeolites
  • interactions
  • contaminants
  • removal
  • mechanisms
  • applications

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Published Papers (2 papers)

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Research

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13 pages, 5322 KiB  
Article
Nanostructured Iron Oxides: Structural, Optical, Magnetic, and Adsorption Characteristics for Cleaning Industrial Effluents
by Suriyaprabha Rajendran, Shivraj Gangadhar Wanale, Amel Gacem, Virendra Kumar Yadav, Inas A. Ahmed, Jari S. Algethami, Shakti Devi Kakodiya, Timsi Modi, Amnah Mohammed Alsuhaibani, Krishna Kumar Yadav and Simona Cavalu
Crystals 2023, 13(3), 472; https://doi.org/10.3390/cryst13030472 - 9 Mar 2023
Cited by 18 | Viewed by 2882
Abstract
Globally, efforts are being made to upgrade and improvise the current wastewater treatment technologies. Industrial wastewater is being generated exponentially, owing to the expansion in chemical industries and civilizations necessitating remediation to prevent further environmental damage and lower associated human risks. In this [...] Read more.
Globally, efforts are being made to upgrade and improvise the current wastewater treatment technologies. Industrial wastewater is being generated exponentially, owing to the expansion in chemical industries and civilizations necessitating remediation to prevent further environmental damage and lower associated human risks. In this work, iron oxide nanoparticles (IONPs) have been developed and employed as an efficient nanocatalyst for heavy metal adsorption via the chemical route. The shape, absorbance optical, crystal phase, and magnetization of as-prepared magnetic nanostructures were characterized using XRD (X-ray diffraction), UV-Vis (ultraviolet-visible), HRTEM (High-resolution transmission electron microscopy), FTIR (Fourier transfer infrared spectroscopy), and VSM. Further, the adsorption ability of iron oxide to remove the bulk metallic elements considering cadmium (Cd), lead (Pb), zinc (Zn), chromium (Cr), copper (Cu), and nickel (Ni), present in industrial effluents, were studied. The Maghemite Fe2O3 crystal phase having an R-3c group is observed in the XRD results. An identical shape of spherical nanostructures is determined using TEM including ≈21 nm for pure Fe2O3. A removal % was studied by using ICP-OES, and showed a Cr (61.2%), Cd (98%), Cu (66%), Ni (64%), Zn (97%), and Pb (98%) removal ability. The application of such monitored nanomaterials to effluent cleaning and sewage discharge emitted via labs and petrochemical industries could be expanded. Full article
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Review

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15 pages, 2912 KiB  
Review
Application of Co3O4 in Photoelectrocatalytic Treatment of Wastewater Polluted with Organic Compounds: A Review
by Fanyue Zhao and Hongchao Ma
Crystals 2023, 13(4), 634; https://doi.org/10.3390/cryst13040634 - 7 Apr 2023
Cited by 6 | Viewed by 2185
Abstract
The negative effects of refractory organic substances in water on the environment and life have aroused worldwide attention. The efficiency of using photoelectrocatalysis (PEC) to degrade refractory organic pollutants depends to a large extent on the properties of the photoanode semiconductor. Therefore, the [...] Read more.
The negative effects of refractory organic substances in water on the environment and life have aroused worldwide attention. The efficiency of using photoelectrocatalysis (PEC) to degrade refractory organic pollutants depends to a large extent on the properties of the photoanode semiconductor. Therefore, the selection of a satisfactory photoanode semiconductor material to promote the production of intermediate reactive species (hydroxyl radicals and superoxide radicals) has become a key issue in improving the efficiency of PEC. Among the available catalysts, transition metal oxides have received a lot of attention in recent years due to their low price and significant advantages. Due to its outstanding photoelectrocatalytic properties, Co3O4 has emerged as a candidate to serve as a photoelectrocatalyst specifically for the oxidation of water with oxygen in these materials. This paper summarizes in detail the recent advances in Co3O4 materials for PEC, both pure Co3O4 and Co3O4-based composites. In addition, this review discusses the impact of strategies on the performance of photoelectrocatalysts, such as synthesis methods, crystal surface structures, and composites. Finally, this review concludes with a presentation of the challenges and workable solutions for Co3O4-based materials in PEC, along with a discussion of their potential for future research. Full article
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