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Catalysts in Chemical Oxidation/Advanced Oxidation Processes (AOP) for Water Purification...
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Catalysts in Chemical Oxidation/Advanced Oxidation Processes (AOP) for Water Purification and Recovery

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (30 October 2022) | Viewed by 9364

Special Issue Editors

Prof. Dr. Hui Zhang

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Guest Editor
Department of Environmental Science and Engineering, School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
Interests: environmental catalysis; advanced oxidation processes (AOPs); persulfate-based AOPs; Fenton-based AOPs; electrochemical AOPs (EAOPs); ozonation and ozone-based AOPs
Dr. Yin Xu

E-Mail Website
Guest Editor
Department of Environmental Engineering, School of Resources and Environmental Science, Hubei University, Wuhan 430062, China
Interests: heterogeneous catalysis; environmental catalytic materials; advanced oxidation processes (AOPs)
Special Issues, Collections and Topics in MDPI journals
Dr. Zhihong Ye

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Guest Editor
Department of Environmental Engineering, College of Environment and Ecology, Chongqing University, Chongqing 400044, China
Interests: environmental electrochemistry; electrochemical advanced oxidation processes; environmental catalysis; photocatalysis

Special Issue Information

Dear Colleagues,

Today, the entire world is facing drinking water scarcity owing to the contamination of groundwater and the discharge of untreated or partially treated industrial wastewater. As is known, some of the refractory organic pollutants or emerging contaminants found in water are difficult to degrade using conventional treatment techniques. To address this issue, the application of catalysts in chemical oxidation/advanced oxidation processes (AOPs), which have recently attracted substantial attention, provides a viable and effective option for attenuation due to the possibility of oxidizing a wide range of toxic or refractory organics.

Catalytic technology has undoubtedly led the scientific advancement of catalysts and catalytic processes over the past few decades. The most evident advantage of the catalytic oxidation process in the field of wastewater treatment is the highly efficient generation of reactive oxygen species (ROS, e.g., hydroxyl radicals (•OH), sulfate radicals (SO4•–), and others), which can effectively attack and degrade target pollutants. In this way, catalysis in chemical oxidation/AOPs plays an important role by transforming pollutants into carbon dioxide, water, and inorganics or, at the very least, into harmless products. Use of this process is viewed as a sustainable approach due to the possibility to increase reaction rates and shorten reaction times. It is worth mentioning that the design, discovery, and preparation of novel catalysts as well as exploration of the catalytic reaction mechanism will play a key enabling role in creating more efficient technologies for water purification.

We welcome submissions to this Special Issue “Catalysts in Chemical Oxidation/Advanced Oxidation Processes (AOPs) for Water Purification and Recovery” in the form of original research papers, reviews, or communications that highlight promising recent research and novel trends in the application of catalysts in chemical oxidation/AOPs for water treatment and purification.

Prof. Dr. Hui Zhang
Dr. Yin Xu
Dr. Zhihong Ye
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. Catalysts 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

  • environmental catalysis
  • advanced oxidation processes (AOPs)
  • persulfate-based AOPs
  • Fenton-based AOPs
  • electrochemical AOPs (EAOPs)
  • photocatalysis
  • water treatment

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Published Papers (4 papers)

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Research

16 pages, 2891 KiB  
Article
Fast and Complete Destruction of the Anti-Cancer Drug Cytarabine from Water by Electrocatalytic Oxidation Using Electro-Fenton Process
by Sule Camcioglu, Baran Özyurt, Nihal Oturan, Clément Trellu and Mehmet A. Oturan
Catalysts 2022, 12(12), 1598; https://doi.org/10.3390/catal12121598 - 7 Dec 2022
Cited by 7 | Viewed by 1918
Abstract
The fast and complete removal of the anti-cancer drug cytarabine (CYT) from water was studied, for the first time, by the electro-Fenton process using a BDD anode and carbon felt cathode. A catalytic amount (10−4 M) of ferrous iron was initially added [...] Read more.
The fast and complete removal of the anti-cancer drug cytarabine (CYT) from water was studied, for the first time, by the electro-Fenton process using a BDD anode and carbon felt cathode. A catalytic amount (10−4 M) of ferrous iron was initially added to the solution as catalyst and it was electrochemically regenerated in the process. Complete degradation of 0.1 mM (24.3 mg L−1) CYT was achieved quickly in 15 min at 300 mA constant current electrolysis by hydroxyl radicals (●OH) electrocatalytically generated in the system. Almost complete mineralization (91.14% TOC removal) of the solution was obtained after 4 h of treatment. The mineralization current efficiency (MCE) and energy consumption (EC) during the mineralization process were evaluated. The absolute (second order) rate constant for the hydroxylation reaction of CYT by hydroxyl radicals was assessed by applying the competition kinetics method and found to be 5.35 × 109 M−1 s−1. The formation and evolution of oxidation reaction intermediates, short-chain carboxylic acids and inorganic ions were identified by gas chromatography-mass spectrometry, high performance liquid chromatography and ion chromatography analyses, respectively. Based on the identified intermediate and end-products, a plausible mineralization pathway for the oxidation of CYT by hydroxyl radicals is proposed. Full article
(This article belongs to the Special Issue Catalysts in Chemical Oxidation/Advanced Oxidation Processes (AOP) for Water Purification and Recovery)
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16 pages, 3891 KiB  
Article
Accelerated Removal of Acid Orange 7 by Natural Iron Ore Activated Peroxymonosulfate System with Hydroxylamine for Promoting Fe(III)/Fe(II) Cycle
by Haibo Li, Linfeng Wang, Dingyuan He, Jie Cai, Wenjie He, Fuzhen Liu, Hanxiao Chen, Hui Zhang and Yin Xu
Catalysts 2022, 12(10), 1148; https://doi.org/10.3390/catal12101148 - 1 Oct 2022
Cited by 1 | Viewed by 1738
Abstract
In this study, peroxymonosulfate (PMS) was activated by cheap and readily available natural iron ore to remove Acid Orange 7 (AO7) in water with the assistance of hydroxylamine (HA). Results show that the presence of HA could accelerate the Fe(II)/Fe(III) cycle on the [...] Read more.
In this study, peroxymonosulfate (PMS) was activated by cheap and readily available natural iron ore to remove Acid Orange 7 (AO7) in water with the assistance of hydroxylamine (HA). Results show that the presence of HA could accelerate the Fe(II)/Fe(III) cycle on the ore surface, promoting the activation of PMS to generate reactive oxidative species. The effects of ore dosage, PMS dosage, HA dosage and initial pH on the degradation of AO7 were investigated in the HA/Ore/PMS system. Under the optimal conditions, the removal of AO7 could reach 93.1% during 30 min, which was 41.4% higher than the ore/PMS system. The AO7 removal increased with the increase of HA, PMS and ore dosage, but was unaffected by the initial solution pH. Based on radical scavenging experiments and EPR tests, the dominant reactive species in the HA/Ore/PMS system were revealed to be the sulfate radical (SO4•−), singlet oxygen (1O2), superoxide radical (O2•−) and hydroxyl radical (•OH), which were responsible for the AO7 degradation. Furthermore, the possible reaction mechanism of PMS activation was proposed. This study provides an efficient technique for the removal of azo dye organic contaminant in water, which has great practical significance. Full article
(This article belongs to the Special Issue Catalysts in Chemical Oxidation/Advanced Oxidation Processes (AOP) for Water Purification and Recovery)
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19 pages, 7189 KiB  
Article
Combining Ultraviolet Photolysis with In-Situ Electrochemical Oxidation for Degrading Sulfonamides in Wastewater
by Zhijie Zheng, Julin Yuan, Xinwei Jiang, Gang Han, Yufang Tao and Xiaogang Wu
Catalysts 2022, 12(7), 711; https://doi.org/10.3390/catal12070711 - 29 Jun 2022
Cited by 7 | Viewed by 1851
Abstract
Ultraviolet photolysis (UVC, 254 nm) was coupled with an electrochemical oxidation process to degrade three kinds of veterinary sulfonamide (sulfamethazine [SMZ] tablets, sulfamonomethoxine [SMM] tablets, and compound sulfamethoxazole [SMX] tablets). The treatment was applied using a flat ceramic microfiltration membrane to study the [...] Read more.
Ultraviolet photolysis (UVC, 254 nm) was coupled with an electrochemical oxidation process to degrade three kinds of veterinary sulfonamide (sulfamethazine [SMZ] tablets, sulfamonomethoxine [SMM] tablets, and compound sulfamethoxazole [SMX] tablets). The treatment was applied using a flat ceramic microfiltration membrane to study the effects of photocatalysts. The effectiveness of degradation of the three sulfonamides was evaluated under different conditions. Dissolved oxygen was provided via aeration, but this resulted in a large decrease in the degradation effectiveness due to the inhibition of free chlorine electrogeneration. The photocatalysts had no promotional effect on sulfonamide removal from wastewater due to reduced UV penetration. Because of the different distribution coefficients of sulfonamides, UV irradiation had different effects on different sulfonamide species. For SMZ and SMM, anionic species exhibited a higher degradation rate, whereas for SMX, degradation was most effective for neutral species. In addition, the free chlorine yield increased as the pH increased. Free chlorine conversion reactions occurred under UV irradiation, with the reactions possibly restrained by sulfonamides. Reactive chlorine species promoted SMM degradation. Compared to UV irradiation or electrochemical oxidation alone, the UV/in-situ electrochemical oxidation process was more effective and is suitable for treating real wastewater under various environmental pH levels. Full article
(This article belongs to the Special Issue Catalysts in Chemical Oxidation/Advanced Oxidation Processes (AOP) for Water Purification and Recovery)
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17 pages, 1355 KiB  
Article
Removal of Organics from Landfill Leachate by Heterogeneous Fenton-like Oxidation over Copper-Based Catalyst
by Sajid Hussain, Eleonora Aneggi, Alessandro Trovarelli and Daniele Goi
Catalysts 2022, 12(3), 338; https://doi.org/10.3390/catal12030338 - 16 Mar 2022
Cited by 19 | Viewed by 2766
Abstract
Landfill leachates are a mixture of high concentration organic and inorganic contaminants and need to be appropriately treated due to their toxicity and severe adverse effects on the environment. Here, we studied the treatment of landfill leachate through a heterogeneous Fenton-like oxidation process [...] Read more.
Landfill leachates are a mixture of high concentration organic and inorganic contaminants and need to be appropriately treated due to their toxicity and severe adverse effects on the environment. Here, we studied the treatment of landfill leachate through a heterogeneous Fenton-like oxidation process using a zirconia supported copper catalyst (Cu/ZrO2). Reaction conditions such as pH, amount of catalyst, oxidant dose, temperature, and reaction time were investigated and their effects on pollutant abatement discussed. AOS (average oxidation state) and COS (carbon oxidation state) parameters were used for the evaluation of the degree of oxidation of the process, obtaining some insight into the formation of oxidized intermediates (partial oxidation) and the total oxidation (mineralization) of the leachate during the reaction. A two-step oxidation process enhanced the overall performance of the reaction with an abatement of organic compounds of 92% confirming the promising activity of a copper-based catalyst for the treatment of liquid waste. Higher catalytic activity was achieved when the following reaction conditions were applied: 70 °C, pH 5, 200 mg/L of catalyst, 30 mL/L of H2O2 dose, and 150 min. In addition, durability of the catalyst under optimized reaction conditions was verified by repeated reaction cycles. Full article
(This article belongs to the Special Issue Catalysts in Chemical Oxidation/Advanced Oxidation Processes (AOP) for Water Purification and Recovery)
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