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Molecules
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Advanced Oxidation/Reduction Processes in Water Treatment
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Advanced Oxidation/Reduction Processes in Water Treatment

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Green Chemistry".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 1795

Special Issue Editors

Dr. Fuxiang Tian

E-Mail Website
Guest Editor
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Interests: UV-based advanced oxidation processes (UV-AOPs); emerging contaminants; drinking water treatment; disinfection byproducts (DBPs); chlorine; chloramine; chlorine dioxide
Dr. Yuqiong Gao

E-Mail Website
Guest Editor
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Interests: water treatment; advanced oxidation processes; advanced reduction processes; sonochemistry in environmental remediation; disinfection byproducts (DBPs)

Special Issue Information

Dear Colleagues,

Our aim is to create a Special Issue on “Advanced Oxidation/Reduction Processes in Water Treatment” to be published in Molecules. The manuscripts selected for publication will demonstrate state-of-the-art technologies in water and wastewater treatment. Topics of interest for this Special Issue include, but are not limited to, advanced oxidation processes (AOPs) such as photochemical processes, sonolysis, electro-oxidation, the integration of AOPs with other technologies, etc., in the removal of micropollutants and emerging contaminants in water; advanced reduction processes (ARPs), such as photochemical processes, sonolysis, electroreduction, zero-valent iron, and the integration of ARPs with other technologies; etc.

Dr. Fuxiang Tian
Dr. Yuqiong Gao
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. Molecules 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 2700 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 processes
  • advanced reduction processes
  • disinfection byproducts
  • hybrid treatment processes
  • micropollutant removal
  • emerging contaminant removal

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Published Papers (2 papers)

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Research

21 pages, 7483 KiB  
Article
Treatment of Produced Water Using a Pilot-Scale Advanced Electrochemical Oxidation Unit
by Bassam Tawabini and Abdullah Basaleh
Molecules 2025, 30(6), 1272; https://doi.org/10.3390/molecules30061272 - 12 Mar 2025
Viewed by 717
Abstract
The main goal of this study is to optimize the treatment of produced water (PW) using a pilot-scale advanced electrochemical oxidation unit. The electro-cell is outfitted with a boron-doped diamond BDD anode and gas diffusion (GDE) cathode. Synthetic PW was prepared in the [...] Read more.
The main goal of this study is to optimize the treatment of produced water (PW) using a pilot-scale advanced electrochemical oxidation unit. The electro-cell is outfitted with a boron-doped diamond BDD anode and gas diffusion (GDE) cathode. Synthetic PW was prepared in the laboratory following a protocol designed to closely replicate the characteristics of real PW. The PW used in this study had a total dissolved solids (TDS) concentration of 16,000 mg/L and a total organic carbon (TOC) concentration of 250 mg/L. The effect of various electrooxidation parameters on the reduction in TOC was investigated including pH (2–12), electric current (I) (50–200 mA/cm2), and airflow rate (0–4 NL/min). Response surface method RSM with a Box–Behnken design at a confidence level of 95 percent was employed to analyze the impact of the above factors, with TOC removal used as a response variable. The results revealed that the TOC level decreased by 84% from 250 to 40 mg/L in 4 h, current density of 200 mA/cm2, pH of 12, and airflow rate 2 (NL/min). The investigation verified the influential role of diverse operational factors in the treatment process. RSM showed that reducing the airflow rate and increasing pH levels and electric current significantly enhanced the TOC removal. The obtained results demonstrated profound TOC removal, confirming the substantial potential of treating PW using the electrochemical method. Full article
(This article belongs to the Special Issue Advanced Oxidation/Reduction Processes in Water Treatment)
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21 pages, 3162 KiB  
Article
Screening Refractory Dye Degradation by Different Advanced Oxidation Processes
by Imane Ouagued, Marc Cretin, Eddy Petit, Geoffroy Lesage, Abderrahmane Djafer, Abdallah Ouagued and Stella Lacour
Molecules 2025, 30(3), 712; https://doi.org/10.3390/molecules30030712 - 5 Feb 2025
Viewed by 785
Abstract
This study investigated Rhodamine B (RhB) degradation by electro-Fenton (EF), anodic oxidation (AO), and their combination (EF/AO), using a carbon felt cathode coupled to a sub-stoichiometric titanium dioxide Magnéli phase (Ti4O7) anode or a platinized titanium (Ti/Pt) anode. The [...] Read more.
This study investigated Rhodamine B (RhB) degradation by electro-Fenton (EF), anodic oxidation (AO), and their combination (EF/AO), using a carbon felt cathode coupled to a sub-stoichiometric titanium dioxide Magnéli phase (Ti4O7) anode or a platinized titanium (Ti/Pt) anode. The results indicated that operational parameters influenced the kinetics of electrochemical reactions. An increase in current density from 10 to 50 mA cm−2 significantly enhanced the RhB degradation rate; 30 mA cm−2 was the optimal current density, balancing both energy efficiency and degradation performance. Moreover, higher RhB concentrations required longer treatment. The Microtox® bioluminescence inhibition test revealed a significant toxicity decrease of the dye solution during electrochemical degradation, which was highest with EF/AO. Similarly, total organic carbon removal was highest with EF/AO (90% at pH 3), suggesting more efficient mineralization of RhB and its by-products than with EF or AO. Energy consumption remained relatively stable with all oxidation processes throughout the 480 min electrolysis period. High-resolution mass spectrometry elucidated RhB degradation pathways, highlighting chain oxidation reactions leading to the formation of intermediates and mineralization to CO2 and H2O. This study underscores the potential of EF, AO, and EF/AO as effective methods for RhB mineralization to develop sustainable and environmentally friendly wastewater treatment strategies. Full article
(This article belongs to the Special Issue Advanced Oxidation/Reduction Processes in Water Treatment)
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