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Toxics
Special Issues
Advanced Oxidation Processes and Biodegradability
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Advanced Oxidation Processes and Biodegradability

A special issue of Toxics (ISSN 2305-6304). This special issue belongs to the section "Toxicity Reduction and Environmental Remediation".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 2188

Special Issue Editors

Dr. Babak Kakavandi

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Guest Editor
Department of Environmental Health Engineering, Alborz University of Medical Sciences, Karaj, Iran
Interests: water and wastewater treatment; heterogeneous catalysts; advanced oxidation process; environmental pollution; environmental monitoring and assessment; environmental science and technology
Dr. Na Tian

E-Mail
Guest Editor
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Interests: advanced oxidation process; environmental chemistry; environmental chemical engineering

Special Issue Information

Dear Colleagues,

Efficient decontamination of different recalcitrant organics from contaminated water/soil/air media is known to be a serious challenge in environmental treatment objectives. Traditional treatment methods are inefficient in terms of the degradation/mineralization of these contaminants in water and wastewater. Advanced oxidation processes (AOPs) should be introduced as effective and satisfactory techniques to degrade a wide range of organic matters. This is on account of their high oxidation potential, environmentally friendliness, high efficiency, and simplicity in operation. In this regard, however, there are some challenges for the practical application of AOPs including: complexity at real scales, toxicity of by-products produced, high-energy consumption, and performance drop in actual samples. Nevertheless, further scientific studies are needed to better understand the mechanisms at play, neutralize the effect of interfering factors, process design engineering, reactions control of oxidation and powerful reactive species generation, improve mineralization efficiency, and enhance the use of sustainable and recyclable catalysts to increase the practical applicability of AOPs. In this Special Issue, entitled “Advanced Oxidation Processes and Biodegradability”, we invite manuscripts on the development, mechanisms, performance and practical application of AOPs (e.g., photocatalysis, ozonation, sonocatalysis, sulfate/iodate/carbonate/chlorine radical-based AOPs, new combinations for AOPs ) for treating the contaminated environments. These may be in the form of reviews, full-length articles, or short communications.

Dr. Babak Kakavandi
Dr. Na Tian
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Toxics 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 2600 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

  • photocatalysis
  • heterogeneous catalysts
  • sulfate-based oxidation
  • degradation and minerialization
  • ozonation
  • refractory contaminants
  • sonocatalysis
  • oxidative biodegradability

Published Papers (2 papers)

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Research

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20 pages, 5422 KiB  
Article
Synergetic Photocatalytic Peroxymonosulfate Oxidation of Benzotriazole by Copper Ferrite Spinel: Factors and Mechanism Analysis
by Masoumeh Golshan, Na Tian, Gcina Mamba and Babak Kakavandi
Toxics 2023, 11(5), 429; https://doi.org/10.3390/toxics11050429 - 4 May 2023
Cited by 11 | Viewed by 1562
Abstract
The development of oxidation processes with the efficient generation of powerful radicals is the most interesting and thought-provoking dimension of peroxymonosulfate (PMS) activation. This study reports the successful preparation of a magnetic spinel of CuFe2O4 using a facile, non-toxic, and [...] Read more.
The development of oxidation processes with the efficient generation of powerful radicals is the most interesting and thought-provoking dimension of peroxymonosulfate (PMS) activation. This study reports the successful preparation of a magnetic spinel of CuFe2O4 using a facile, non-toxic, and cost-efficient co-precipitation method. The prepared material exhibited a synergetic effect with photocatalytic PMS oxidation, which was effective in degrading the recalcitrant benzotriazole (BTA). Moreover, central composite design (CCD) analysis confirmed that the highest BTA degradation rate reached 81.4% after 70 min of irradiation time under the optimum operating conditions of CuFe2O4 = 0.4 g L−1, PMS = 2 mM, and BTA = 20 mg L−1. Furthermore, the active species capture experiments conducted in this study revealed the influence of various species, including •OH, SO4•−, O2•−, and h+ in the CuFe2O4/UV/PMS system. The results showed that SO4•− played a predominant role in BTA photodegradation. The combination of photocatalysis and PMS activation enhanced the consumption of metal ions in the redox cycle reactions, thus minimizing metal ion leaching. Additionally, this maintained the reusability of the catalyst with reasonable mineralization efficiency, which reached more than 40% total organic carbon removal after four batch experiments. The presence of common inorganic anions was found to have a retardant effect on BTA oxidation, with the order of retardation following: HCO3− > Cl− > NO3− > SO42−. Overall, this work demonstrated a simple and environmentally benign strategy to exploit the synergy between the photocatalytic activity of CuFe2O4 and PMS activation for the treatment of wastewater contaminated with widely used industrial chemicals such as BTA. Full article
(This article belongs to the Special Issue Advanced Oxidation Processes and Biodegradability)
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Review

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34 pages, 4397 KiB  
Review
A Review on the Use of Metal Oxide-Based Nanocomposites for the Remediation of Organics-Contaminated Water via Photocatalysis: Fundamentals, Bibliometric Study and Recent Advances
by Evando S. Araújo, Michel F. G. Pereira, Georgenes M. G. da Silva, Ginetton F. Tavares, Carlos Y. B. Oliveira and Pedro M. Faia
Toxics 2023, 11(8), 658; https://doi.org/10.3390/toxics11080658 - 1 Aug 2023
Cited by 5 | Viewed by 2485
Abstract
The improper disposal of toxic and carcinogenic organic substances resulting from the manufacture of dyes, drugs and pesticides can contaminate aquatic environments and potable water resources and cause serious damage to animal and human health and to the ecosystem. In this sense, heterogeneous [...] Read more.
The improper disposal of toxic and carcinogenic organic substances resulting from the manufacture of dyes, drugs and pesticides can contaminate aquatic environments and potable water resources and cause serious damage to animal and human health and to the ecosystem. In this sense, heterogeneous photocatalysis stand out as one effective and cost-effective water depollution technique. The use of metal oxide nanocomposites (MON), from the mixture of two or more oxides or between these oxides and other functional semiconductor materials, have gained increasing attention from researchers and industrial developers as a potential alternative to produce efficient and environmentally friendly photocatalysts for the remediation of water contamination by organic compounds. Thus, this work presents an updated review of the main advances in the use of metal oxide nanocomposites-based photocatalysts for decontamination of water polluted by these substances. A bibliometric analysis allowed to show the evolution of the importance of this research topic in the literature over the last decade. The results of the study also showed that hierarchical and heterogeneous nanostructures of metal oxides, as well as conducting polymers and carbon materials, currently stand out as the main materials for the synthesis of MON, with better photocatalysis performance in the degradation of dyes, pharmaceuticals and pesticides. Full article
(This article belongs to the Special Issue Advanced Oxidation Processes and Biodegradability)
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