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Magnetochemistry
Special Issues
Application of Magnetic Nanomaterials in Water Pollution Treatment
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Application of Magnetic Nanomaterials in Water Pollution Treatment

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Nanospecies".

Deadline for manuscript submissions: closed (20 February 2023) | Viewed by 7375

Special Issue Editors

Dr. Wei Ding

E-Mail Website
Guest Editor
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
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Huaili Zheng

E-Mail Website
Guest Editor
College of Environment and Ecology, Chongqing University, Chongqing 400044, China
Interests: water treatment agents and water treatmen; magnetic coagulants/flocculants; advanced oxidation processes; functional nanomaterials; environmental electrochemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In water treatment materials, the residue phenomenon is a major constraint in the implementation of water remediation processes for urban sewage treatment, as uncontrolled suspension prolongs the settle time and increases operational costs. Conventional water treatment materials that have been functionalized with magnetochemistry have been proven to improve water treatment efficiency because of the shortened setting time and easy recovery of used/exhausted materials. However, the theoretical framework mainly focuses on evaluating the efficiencies of magnetic materials in water treatment as well as the roles of magnetochemistry in whole treatment processes, mechanisms that have still not been explored in great detail. Vavirous experts, including synthetic chemists, physicists, environmentalist, and materials scientists, continuously aim for the development of this promising field by providing a body of knowledge based on evidence demonstrating the efectiveness of magnetic water treatment materials that have been applied in water treatment operations. This Special Issue of the open access journal Magnetochemistry aims to expose frontier research articles that have an impact on the application of magnetic nanomaterials in the field of water pollution treatment. Researchers are invited to submit original research articles on topics such as magnetic catalysts, coagulat/flocculat(s), absorbents, 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.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 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

  • magnetic catalysts
  • coagulat/flocculat(s)
  • absorbents
  • magnetic nanomaterials
  • water pollution treatment

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Published Papers (3 papers)

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13 pages, 34883 KiB  
Article
Fungus-Based Magnetic Nanobiocomposites for Environmental Remediation
by Thais de Oliveira Chaves, Raquel Dosciatti Bini, Verci Alves de Oliveira Junior, Andressa Domingos Polli, Adriana Garcia, Gustavo Sanguino Dias, Ivair Aparecido dos Santos, Paula Nunes de Oliveira, João Alencar Pamphile and Luiz Fernando Cotica
Magnetochemistry 2022, 8(11), 139; https://doi.org/10.3390/magnetochemistry8110139 - 26 Oct 2022
Cited by 3 | Viewed by 2298
Abstract
The use of a variety of microorganisms for the degradation of chemicals is a green solution to the problem of environmental pollution. In this work, fungi–magnetic nanoparticles were studied as systems with the potential to be applied in environmental remediation and pest control [...] Read more.
The use of a variety of microorganisms for the degradation of chemicals is a green solution to the problem of environmental pollution. In this work, fungi–magnetic nanoparticles were studied as systems with the potential to be applied in environmental remediation and pest control in agriculture. High food demand puts significant pressure on increasing the use of herbicides, insecticides, fungicides, pesticides, and fertilizers. The global problem of water pollution also demands new remediation solutions. As a sustainable alternative to commercial chemical products, nanobiocomposites were obtained from the interaction between the fungus M. anisopliae and two different types of magnetic nanoparticles. Fourier transform infrared spectroscopy, optical and electron microscopy, and energy dispersive spectroscopy were used to study the interaction between the fungus and nanoparticles, and the morphology of individual components and the final nanobiocomposites. Analyses show that the nanobiocomposites kept the same morphology as that of the fungus in natura. Magnetic measurements attest the magnetic properties of the nanobiocomposites. In summary, these nanobiocomposites possess both fungal and nanoparticle properties, i.e., nanobiocomposites were obtained with magnetic properties that provide a low-cost approach benefiting the environment (nanobiocomposites are retrievable) with more efficiency than that of the application of the fungus in natura. Full article
(This article belongs to the Special Issue Application of Magnetic Nanomaterials in Water Pollution Treatment)
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23 pages, 4092 KiB  
Article
Synthesis of a Doped α-Fe2O3/g-C3N4 Catalyst for High-Efficiency Degradation of Diazinon Contaminant from Liquid Wastes
by Tariq J. Al-Musawi, Rasoul Asgariyan, Murat Yilmaz, Nezamaddin Mengelizadeh, Abolfazl Asghari, Davoud Balarak and Mohammad Darvishmotevall
Magnetochemistry 2022, 8(11), 137; https://doi.org/10.3390/magnetochemistry8110137 - 22 Oct 2022
Cited by 20 | Viewed by 2407
Abstract
In this work, a hematite/porous graphite carbon-nitride (α-Fe2O3/g-C3N4) catalyst was synthesized through the doping of hematite loaded onto porous graphite carbon-nitride using a heat treatment process. Then, the ability of catalyst was evaluated to degrade [...] Read more.
In this work, a hematite/porous graphite carbon-nitride (α-Fe2O3/g-C3N4) catalyst was synthesized through the doping of hematite loaded onto porous graphite carbon-nitride using a heat treatment process. Then, the ability of catalyst was evaluated to degrade diazinon (DZN) for the first time, mainly via the sonophotocatalytic process. Among the samples, the greatest DZN degradation was observed in the sonophotocatalytic system, which separated 100% of DZN from the aqueous solution after 50 min, while the removal percentages for the sonocatalytic, photocatalytic, and adsorption systems were 72.9, 89.1, and 58.1%, respectively. The results of scavengers showed that both sulfate and hydroxyl radicals (•OH) participated in removing DZN, although positive holes and negative •OH played a major role. Moreover, the removal efficiencies of the target pollutant using the sonophotocatalytic process were higher than those using the photocatalytic, sonocatalytic, and adsorption processes. The reaction profile followed pseudo-first-order kinetics, and the reaction rate coefficient for the sonophotocatalytic system was 2.2 times higher than that of the photocatalytic system and 2.64 times higher than that of the sonocatalytic system. The energy consumption of the sonophotocatalytic system after 60 min was 11.6 kWh/m3, while it was 31.1 kWh/m3 for the photocatalytic system. A DZN removal percentage of 100% was obtained after 50 min under the following conditions: UV intensity of 36 watts, ultrasound frequency of 36 kHz, DZN concentration of 50 mg/L at pH 5, and α-Fe2O3/g-C3N4 dosage of 0.4 g/L. The catalyst reusability was examined with only a 9.9% reduction in efficiency after eight consecutive cycles. The chemical oxygen demand (COD) and total organic compound (TOC) removal percentages were 95.6% and 88.6%, respectively, and the five-day biochemical oxygen demand (BOD5)/COD ratio was 0.16 at the beginning of the degradation process and 0.69 at the end of the process. In addition, toxicological experiments showed that degradation of DZN by the sonophotocatalytic process exhibited low toxicity. All results confirmed that the sonophotocatalytic process using α-Fe2O3/g-C3N4 was a highly efficient process for DZN pollutant removal from liquid wastes. Full article
(This article belongs to the Special Issue Application of Magnetic Nanomaterials in Water Pollution Treatment)
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17 pages, 2525 KiB  
Article
The Synthesis of Metal–Organic-Framework-Based Ternary Nanocomposite for the Adsorption of Organic Dyes from Aqueous Solutions
by Norah Salem Alsaiari, Haitham Osman, Abdelfattah Amari and Mohamed A. Tahoon
Magnetochemistry 2022, 8(10), 133; https://doi.org/10.3390/magnetochemistry8100133 - 19 Oct 2022
Cited by 8 | Viewed by 2094
Abstract
In the present study, a ternary magnetic nanocomposite (SiO2/MnFe2O4/ZIF-8) was synthesized via the embedding of the SiO2/MnFe2O4 nanocomposite within the metal–organic framework (ZIF-8). The synthesized nanocomposite was characterized using suitable techniques including [...] Read more.
In the present study, a ternary magnetic nanocomposite (SiO2/MnFe2O4/ZIF-8) was synthesized via the embedding of the SiO2/MnFe2O4 nanocomposite within the metal–organic framework (ZIF-8). The synthesized nanocomposite was characterized using suitable techniques including FT-IR, XRD, SEM, TEM, VSM, and BET. The nanocomposite showed a high surface area (SBET = 831 m2·g−1) and superparamagnetic behavior (23.7 emu·g−1). All characterization techniques confirmed the successful combination of three nanocomposite parts (MnFe2O4, SiO2, and ZIF-8). The nanocomposite was examined for the adsorption of organic dyes, malachite green (MG) and methyl red (MR), from aqueous solutions. The adsorption conditions including ionic strength, contact time, pH, and adsorbent dosage were optimized by studying their change effect. The SiO2/MnFe2O4/ZIF-8 nanocomposite showed high adsorption capacities (1000.03 and 1111.12 mg/g) for the removal of MG and MR, respectively, from water. The isotherm and kinetics studies indicated that the adsorption of MG and MR dyes on the surface of the SiO2/MnFe2O4/ZIF-8 nanocomposite followed the Langmuir isotherm model and pseudo-second-order kinetic model, suggesting the monolayer chemisorption mechanism. The reusability study of up to five successive cycles indicated the successful reuse of the SiO2/MnFe2O4/ZIF-8 adsorbent for dye removal from wastewater. The comparison of the present adsorbent to the previously reported adsorbents indicated that it is a promising adsorbent for dye adsorption from wastewater and must be investigated in the future for the removal of additional pollutants. Full article
(This article belongs to the Special Issue Application of Magnetic Nanomaterials in Water Pollution Treatment)
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