Applications of Magnetic Materials in Water Treatment

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Applications of Magnetism and Magnetic Materials".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 666

Special Issue Editors

College of Environment and Ecology, Chongqing University, Chongqing 400044, China
Interests: magnetic adsorbents; magnetic catalyst carriers; magnetic coagulants/flocculants; transition metal coordination chemistry; functional materials
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Guest Editor
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Interests: water treatment; environmental protection; magnetic coagulation; magnetic adsorption; advanced oxidation process; catalyst; self-floating water treatment agent; sludge dewatering; hazardous pollutants' removal
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the field of water treatment materials, the phenomenon of residues is a major constraint for implementing urban wastewater treatment and restoration. Uncontrolled suspensions prolong the sedimentation time and increase operational costs. The application of magnetic fields in water treatment processes has been shown to enhance the efficiency and effectiveness of these processes. The presence of a magnetic field can have a significant impact on various aspects of water treatment, including coagulation, flocculation, sedimentation, and filtration. However, the current theoretical framework mainly focuses on evaluating the efficiency of magnetic materials in water treatment and the role of magnetochemistry throughout the treatment process, without a detailed exploration of its mechanisms. Various experts, including synthetic chemists, physicists, environmentalists, and materials scientists, have been devoted to developing this promising field. They have provided an evidence-based knowledge system demonstrating the effectiveness of magnetic water treatment materials, which has been applied in water treatment operations. This Special Issue is published in the open access journal Magnetochemistry aiming to disclose cutting-edge research articles that have an impact on the application of magnetic nanomaterials in water pollution control. Researchers are invited to submit original research papers on topics such as magnetic catalysts, coagulants/flocculants, adsorbents, etc.

Dr. Wei Ding
Prof. Dr. Huaili Zheng
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. Magnetochemistry is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • the enhanced effect of magnetic field on water treatment processes
  • the molecular approaches to the preparation of multifunctional magnetic materials
  • magnetic catalysts/adsorbents
  • magnetic coagulation/ flocculation
  • magnetic separation
  • magnetic precipitator

Published Papers (1 paper)

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Research

15 pages, 2255 KiB  
Article
A Novel Magnetic Nano-Adsorbent Functionalized with Green Tea Extract and Magnesium Oxide to Remove Methylene Blue from Aqueous Solutions: Synthesis, Characterization, and Adsorption Behavior
by Wenchao Lin, Yaoyao Huang, Shuang Liu, Wei Ding, Hong Li and Huaili Zheng
Magnetochemistry 2024, 10(5), 31; https://doi.org/10.3390/magnetochemistry10050031 - 24 Apr 2024
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Abstract
In this study, a novel green tea/Mg-functionalized magnetic nano-adsorbent, denoted as GTE-MgO-Fe3O4 NPs, was developed and applied to the extraction of Methylene Blue (MB) from water-based solutions. The GTE-MgO-Fe3O4 NPs were synthesized by incorporating green tea extracts [...] Read more.
In this study, a novel green tea/Mg-functionalized magnetic nano-adsorbent, denoted as GTE-MgO-Fe3O4 NPs, was developed and applied to the extraction of Methylene Blue (MB) from water-based solutions. The GTE-MgO-Fe3O4 NPs were synthesized by incorporating green tea extracts (GTE) and Mg species onto the surface of Fe3O4 nanoparticles using a hydrothermal method. Characterization analyses corroborated the successful functionalization of the Fe3O4 surface with GTE and Mg species, resulting in a superparamagnetic adsorbent equipped with abundant surface functional groups, which promoted MB adsorption and facilitated magnetic separation. Batch experiments revealed that different operating parameters had an impact on the adsorption behavior, such as adsorbent dosage, pH, coexisting ions, contact time, the initial MB concentration, and temperature. The investigations of adsorption kinetics and isotherms emphasized that the MB adsorption onto GTE-MgO-Fe3O4 NPs was an exothermic process dominated by chemisorption. The experimental adsorption capacity of GTE-MgO-Fe3O4 NPs for MB surpassed 174.93 mg g−1, markedly superior to the performance of numerous other adsorbents. Ultimately, the utilized GTE-MgO-Fe3O4 NPs could be effectively regenerated through acid pickling, retaining over 76% of its original adsorption capacity after six adsorption–desorption cycles, which suggested that GTE-MgO-Fe3O4 NPs was a suitable adsorbent for eliminating MB from effluent. Full article
(This article belongs to the Special Issue Applications of Magnetic Materials in Water Treatment)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Exploring the utilization of magnetic materials as adsorbents for high-risk contaminants removal from wastewaters– a review
Authors: Oana-Georgiana Dragos-Pinzaru, Nicoleta Lupu, Horia Chiriac, Gabriela Buema
Affiliation: National Institute of Research and Development for Technical Physics (NIRDTP), Iasi, Romania

Title: Magnetic nanocomposites based on rice husk-derived zeolites for chlorogenic acid adsorption
Authors: Tainara Ramos Neves1; Letícia Ferreira Lacerda Schildt1; Maria Luiza Lopes Sierra e Silva1; João Otávio Donizette Malafatti2; Vannyla Viktória Viana Vasconcelos1; Simone Quaranta3; Sandra Aparecida DuFerreira4; Elaine Cristina Paris1
Affiliation: 1)Department of Chemistry, Federal University of São Carlos, São Carlos 13565-905, Brazil 2)Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação,São Carlos 13560-970, Brazil 3)Institute for the Study of Nanostructured Materials, Italian National Research Council (ISMN–CNR), 00010 Rome, Italy 4)Department of Chemistry, Laboratory of Analysis and Water Treatment, Federal University of Espírito Santo, Vitória 29075-910, Brazil
Abstract: Removal of polyphenol contaminants in industrial wastewater is regarded as a significant challenge Needless to say, adsorption has been emerging as a promising method for the removal of polyphenols and for water remediation in general. This study explores chlorogenic acid(CGA,a polyphenol-related compound) adsorption on zeolite-based magnetic nanocomposites. zeolites synthesis took advantage of high purity silica extracted from rice husks, and hydrothermal treatment in order to enhance specific surface area (SSA). Notably, a 18 h hydrothermally-zeolite (Z18), proved to be the most effective in adsorbing CGA from water due to a remarkable SSA (217.69 m2/g). Furthermore, Z18 was functionalized (Z18 M) with a silane (3-aminopropyl)triethoxysilane (APTES)-trimethylchlorosilane (TMCS) mixture and immobilized onto cuprospinel (CuFe2O4) particles. The resulting magnetic nanocomposites, namely Z18:CuFe2O4 and Z18 M:CuFe2O4, achieved a 31.96% and 79.53% CGA adsorption rate, respectively. In addition Z18 M:CuFe2O4 was tested for cytotoxicity and was found to be non-toxic to plants. Finally, over 85% of the nanocomposite mass was recovered by applying an external magnetic field. These results suggest that magnetic nanocomposites are amenable to in polyphenols removal from industrial wastewater, thereby supporting the circular economy principles by valorizing agro-industrial waste.

Title: Evaluation of the adsorption of methyl blue (MB) onto tea leaf extract mediated composite metal magnetic adsorbent: Performance and elucidation of key adsorption mechanisms
Authors: Wei Ding1; Huaili Zheng1; Yaoyao Huang2
Affiliation: 1)Chongqing University; 2)Chongqing Technology and Business University

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