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Advanced Oxidation Technologies for Water and Wastewater Treatment
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Advanced Oxidation Technologies for Water and Wastewater Treatment

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: 20 January 2026 | Viewed by 2054

Special Issue Editors

Dr. Qiao Wang

E-Mail Website
Guest Editor
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, China
Interests: advanced oxidation technologies; water and wastewater treatment; emerging contaminants; functional materials; water toxicity
Dr. Huarui Li

E-Mail Website
Guest Editor
School of Civil Engineering, Yantai University, Yantai, China
Interests: emerging contaminants; water/wastewater treatment; advanced oxidation; heterogeneous catalysis; nanomaterials; persulfates
Dr. Jialin Jia

E-Mail Website
Guest Editor
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
Interests: advanced oxidation technologies; water treatment; photocatalytic oxidation technology; persulfate oxidation technology; sterilization and disinfection

Special Issue Information

Dear Colleagues,

The escalation of water pollution and resource scarcity necessitates innovative solutions, with Advanced Oxidation Technologies (AOTs) offering transformative potential by leveraging reactive species to degrade persistent pollutants that are challenging to target with conventional water/wastewater treatment methods. While AOTs excel in environmental remediations, barriers like high energy demands, operational costs, and potential secondary pollution risks demand advancements in efficiency, scalability, and sustainability. Moreover, there remain obscurities regarding reaction mechanisms, including unclear radical/unradical regulation pathways, insufficient quantitative models for multi-factor interactions, and a lack of in situ characterization of dynamic interfacial processes.

We invite you to contribute to a Special Issue on Advanced Oxidation Technologies (AOTs) for Water and Wastewater Treatment. This Special Issue will highlight cutting-edge research that aims to optimize AOT performance through the development of novel materials, hybrid systems, and reactor designs, while addressing real-world complexities in industrial, municipal, and saline matrices. Key topics of interest include, but are not limited to, the following:

  • Catalytic Ozonation Processes;
  • Electro-Fenton, Photo-Fenton, and Heterogeneous Fenton Systems;
  • Photocatalytic/Electrocatalytic Oxidation Processes;
  • Noval catalyst and reactor designs;
  • Persulfate/Peroxymonosulfate/Permanganate/Perferrate Activation Strategies;
  • Catalytic Membrane Processes;
  • Generation mechanisms and quantification of reactive oxygen species (ROS);
  • Plasma-driven water treatment technologies;
  • AOT–Bioremediation hybrid systems;
  • Machine Learning-driven AOP prediction and optimization.

We seek interdisciplinary contributions bridging fundamental science and practical applications, focusing on cost-effective, energy-efficient solutions that support global water quality standards and circular economy goals. Submissions on emerging AOT innovations, process optimization, and sustainability strategies are particularly encouraged.

Dr. Qiao Wang
Dr. Huarui Li
Dr. Jialin Jia
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 250 words) can be sent to the Editorial Office for assessment.

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. Water 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 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

  • advanced oxidation technologies
  • water treatment
  • pollutant removal
  • catalyst design
  • oxidation mechanisms

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

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22 pages, 5100 KB  
Article
Fe-Doped g-C3N4 for Enhanced Photocatalytic Degradation of Brilliant Blue Dye
by Rongjun Su, Haoran Liang, Hao Jiang, Guangshan Zhang and Chunyan Yang
Water 2025, 17(22), 3220; https://doi.org/10.3390/w17223220 - 11 Nov 2025
Viewed by 460
Abstract
Brilliant blue, as a pigment food additive, has all the characteristics of printing and dyeing wastewater and belongs to persistent and refractory organic compounds. The photocatalysis–Fenton reaction system consists of two parts: photocatalytic reaction and Fenton reaction. Electrons promote the decomposition of H [...] Read more.
Brilliant blue, as a pigment food additive, has all the characteristics of printing and dyeing wastewater and belongs to persistent and refractory organic compounds. The photocatalysis–Fenton reaction system consists of two parts: photocatalytic reaction and Fenton reaction. Electrons promote the decomposition of H2O2 to produce •OH. In addition, the effective separation of e- and h+ by light strengthens the direct oxidation of h+, and h+ reacts directly with OH− to produce •OH, which can further promote the removal of organic pollutants. In this paper, g-C3N4 and Fe/g-C3N4 photocatalysts were prepared by the thermal polycondensation method. Fe/g-C3N4 of 15 wt% can reach 98.59% under the best degradation environment, and the degradation rate of g-C3N4 is only 7.6% under the same conditions. The photocatalytic activity of the catalysts was further studied. Through active species capture experiments, it is known that •OH and •O2− are the main active species in the system, and the action intensity of •OH is greater than that of •O2−. The degradation reaction mechanism is that H2O2 combines with Fe2+ in Fe/g-C3N4 to generate a large amount of •OH and Fe3+, and the combination of Fe-N bonds accelerates the cycle of Fe3+/Fe2+ and promotes the formation of •OH, thereby accelerating the degradation of target pollutants. •O2− can reduce Fe3+ to Fe2+, Fe2+ reacts with H2O2 to produce •OH, which promotes degradation, and •O2− itself also plays a role in degradation. In addition, under the optimal experimental conditions obtained by response surface experiments, the fitting degree of first-order reaction kinetics is 0.96642, and the fitting degree of second-order reaction kinetics is 0.57884. Therefore, this reaction is more in line with first-order reaction kinetics. The adsorption rate is only proportional to the concentration of Fe/g-C3N4. Full article
(This article belongs to the Special Issue Advanced Oxidation Technologies for Water and Wastewater Treatment)
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Review

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21 pages, 2338 KB  
Review
Electrochemical Ammonia Oxidation in Water Treatment: A Comprehensive Review on Mechanisms, Catalysts, and Implementation Challenges
by Xuanxu Shen and Fang Ma
Water 2025, 17(21), 3106; https://doi.org/10.3390/w17213106 - 30 Oct 2025
Viewed by 1295
Abstract
The discharge of ammonia-rich wastewater poses significant threats to water quality and ecosystem health, driving the need for efficient and sustainable treatment technologies. The electrochemical ammonia oxidation reaction (eAOR) has emerged as a promising alternative to conventional biological and physicochemical methods, offering advantages [...] Read more.
The discharge of ammonia-rich wastewater poses significant threats to water quality and ecosystem health, driving the need for efficient and sustainable treatment technologies. The electrochemical ammonia oxidation reaction (eAOR) has emerged as a promising alternative to conventional biological and physicochemical methods, offering advantages such as in situ oxidant generation, tunable product selectivity, and applicability under challenging water matrices. This comprehensive review systematically examines the mechanisms, catalyst design, and environmental factors influencing eAOR performance. Two primary pathways are detailed: direct eAOR, involving stepwise dehydrogenation of NH3 on the electrode surface, and indirect eAOR, mediated by electrogenerated reactive chlorine species (RCS). The mechanisms—including the Oswin-Salomon and Gerischer-Mauerer pathways for direct oxidation, as well as breakpoint chlorination and radical-mediated routes for indirect oxidation—are critically discussed alongside experimental and theoretical evidence. Recent advances in electrocatalyst development are highlighted, covering noble metals, non-noble transition metal oxides, alloys, and hybrid materials, with an emphasis on enhancing activity, selectivity toward N2, and durability. Key operational parameters such as pH, chloride concentration, and coexisting ions are analyzed for their impact on reaction kinetics and byproduct formation. Finally, the review identifies current challenges—including catalyst poisoning, toxic byproduct generation, and scalability—and outlines future research directions aimed at advancing eAOR toward energy-efficient, resource-recovering water treatment systems. Full article
(This article belongs to the Special Issue Advanced Oxidation Technologies for Water and Wastewater Treatment)
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