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Applied Sciences
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Research Advances of Removal of Pollutants by Advanced Oxidation Technologies
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Research Advances of Removal of Pollutants by Advanced Oxidation Technologies

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Environmental Sciences".

Deadline for manuscript submissions: closed (31 May 2020) | Viewed by 10770

Special Issue Editors

Dr. Marcos Larriba

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Guest Editor
Chemical Engineering Department, Complutense University of Madrid, 28040 Madrid, Spain
Interests: the development of novel separation processes based on liquid-liquid extraction using alternative solvents, such as ionic liquids and deep eutectic solvents
Special Issues, Collections and Topics in MDPI journals
Dr. Silvia Álvarez-Torrellas

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Guest Editor
Grupo de Catálisis y Procesos de Separación-CyPS, Dept Ingeniería Química y de Materiales, Facultad de Ciencias Químicas, Complutense University, Avda Complutense S-N, E-28040 Madrid, Spain
Interests: adsorption processes; heterogeneous catalysis; modelling; nanostructured carbon materials
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Juan García Rodríguez

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Guest Editor
Catalysis and Separation Processes Group (CyPS), Department of Chemical and Materials Engineering, Complutense University of Madrid, 28040 Madrid, Spain
Interests: adsorption processes; catalytic wet air oxidation; synthesis and characterization of carbon materials; wastewater treatments; 3-D printing of carbon materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Wastewater treatment plants produce wastes that contain many potential contaminants. Today, as a consequence of stricter legislations, more efficient wastewater treatment technologies are necessary. In this context, advances in chemical water and wastewater treatment have led to the continuous development of a range of processes denominated advanced oxidation technologies. These technologies have shown great potential in treating pollutants at low and high concentrations compared to conventional technologies such as adsorption, air stripping, and biodegradation and have found applications as diverse as industrial, groundwater, and municipal wastewater treatment, industrial sludge destruction, etc. This Special Issue is focused on recent advances in oxidation processes as alternative treatment methods for wastewater contaminants. Original research papers, reviews, and short reviews discussing hybrid processes, heterogeneous semiconductor photocatalysis, persulphate oxidation, catalytic wet air oxidation, catalytic wet peroxide oxidation, advanced electrochemical oxidation technologies, and synthesis and characterization of new heterogeneous catalysts are invited for submission.

Prof. Dr. Marcos Larriba Martínez
Prof. Dr. Silvia Álvarez-Torrellas
Prof. Dr. Juan García Rodríguez
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.

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Keywords

  • Organic contaminants
  • Wastewater treatment
  • Hybrid processes
  • Advanced oxidation technologies
  • Reaction intermediates and mechanisms
  • Heterogeneous catalysts
  • Activity and stability of catalysts

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Published Papers (3 papers)

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Research

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13 pages, 1629 KiB  
Article
Catalytic Degradation of 4-Ethylpyridine in Water by Heterogeneous Photo-Fenton Process
by Nasr Bensalah, Mohammad I. Ahmad and Ahmed Bedoui
Appl. Sci. 2019, 9(23), 5073; https://doi.org/10.3390/app9235073 - 25 Nov 2019
Cited by 2 | Viewed by 3065
Abstract
In this work, the degradation of 4-ethylpyridine (4EP) in water by a heterogeneous photo-Fenton process (H2O2/Fe3O4/ultraviolet irradiation (UV)) was investigated. More rapid and effective 4EP degradation was obtained with H2O2/Fe3 [...] Read more.
In this work, the degradation of 4-ethylpyridine (4EP) in water by a heterogeneous photo-Fenton process (H2O2/Fe3O4/ultraviolet irradiation (UV)) was investigated. More rapid and effective 4EP degradation was obtained with H2O2/Fe3O4/UV than Fenton-like (H2O2/Fe3O4) and UV/H2O2, which is due to the larger production of hydroxyl radicals from the chemical and photolytic decomposition of H2O2. The operational conditions were varied during 4EP degradation experiments to evaluate the effects of pH, catalyst, concentration, and temperature on the kinetics and efficiency of H2O2/Fe3O4/UV oxidation. Under optimal conditions (100 mg/L 4EP, [H2O2] = 1000 mg/L, Fe3O4 = 40 mg/L, pH = 3 and room temperature, 300 rpm), 4EP was totally declined and more than 93% of the total organic carbon (TOC) was eliminated. Liquid chromatography analysis confirmed the formation of aromatic and aliphatic intermediates (4-hydroxypyridine, 4-pyridone, malonic, oxalic, and formic acids) that resulted in being mineralized. Ion chromatography analysis demonstrated the stoichiometric release of NH4+ ions during 4EP degradation by heterogeneous photo-Fenton oxidation. The reuse of the heterogeneous catalyst was evaluated after chemical and heat treatment at different temperatures. The heat-treated catalyst at 500 °C presented similar activity than the pristine Fe3O4. Accordingly, heterogeneous photo-Fenton oxidation can be an alternative method to treat wastewaters and groundwater contaminated with pyridine derivatives and other organic micropollutants. The combination of heterogeneous photo-Fenton oxidation with classical biological methods can be proposed to reduce the overall cost of the treatment in large-scale water treatment plants. Full article
(This article belongs to the Special Issue Research Advances of Removal of Pollutants by Advanced Oxidation Technologies)
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11 pages, 1554 KiB  
Article
Degradation of UV Filter Ethyl 4-Aminobenzoate (Et-PABA) Using a UV-Activated Persulfate Oxidation Process
by Ruirui Han, Qiang Wu, Chihao Lin, Lingfeng Zhang, Zhicai Zhai, Ping Sun, Yingsen Fang, Jiaqiang Wu and Hui Liu
Appl. Sci. 2019, 9(14), 2873; https://doi.org/10.3390/app9142873 - 18 Jul 2019
Cited by 9 | Viewed by 3406
Abstract
In this paper, the ultraviolet/persulfate (UV/PDS) combined oxidation process was used to remove the ethyl 4-aminobenzoate (Et-PABA), one of the typical 4-aminobenzoic acid (PABA)-type UV filters. The effects of various factors on the removal of Et-PABA using the UV/PDS process were investigated, and [...] Read more.
In this paper, the ultraviolet/persulfate (UV/PDS) combined oxidation process was used to remove the ethyl 4-aminobenzoate (Et-PABA), one of the typical 4-aminobenzoic acid (PABA)-type UV filters. The effects of various factors on the removal of Et-PABA using the UV/PDS process were investigated, and the degradation mechanisms of Et-PABA were explored. The results showed that the UV/PDS process can effectively remove 98.7% of Et-PABA within 30 min under the conditions: UV intensity of 0.92 mW·cm−2, an initial concentration of Et-PABA of 0.05 mM, and a PDS concentration of 2 mM. The removal rate of Et-PABA increased with the increase in PDS dosage within the experimental range, whereas humic acid (HA) had an inhibitory effect on Et-PABA removal. Six intermediates were identified based on HPLC–MS and degradation pathways were then proposed. It can be foreseen that the UV/PDS oxidation process has broad application prospects in water treatment. Full article
(This article belongs to the Special Issue Research Advances of Removal of Pollutants by Advanced Oxidation Technologies)
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Review

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17 pages, 1905 KiB  
Review
Contaminants of Emerging Concern Removal by High-Energy Oxidation-Reduction Processes: State of the Art
by Andrea G. Capodaglio
Appl. Sci. 2019, 9(21), 4562; https://doi.org/10.3390/app9214562 - 27 Oct 2019
Cited by 26 | Viewed by 3717
Abstract
The presence of ‘emerging contaminants’, i.e., chemicals yet without a regulatory status and poorly understood impact on human health and environment, in wastewater and aquatic environments is widely reported. No established technology, to date, can simultaneously and completely remove all these contaminants, even [...] Read more.
The presence of ‘emerging contaminants’, i.e., chemicals yet without a regulatory status and poorly understood impact on human health and environment, in wastewater and aquatic environments is widely reported. No established technology, to date, can simultaneously and completely remove all these contaminants, even though some Advanced Oxidation Processes (AOPs,) have demonstrated capacity for some degradation of these compounds. High-energy, radiolytic processing of water matrices using various sources: electron beam (EB), ɣ-rays or non-thermal plasma (NTP) have shown excellent results in many applications, although these remain at the moment isolated examples and scarcely known. High-energy irradiation constitutes an additive-free process that uses short-lived, highly reactive radicals (both oxidating and reducing) generated by water radiolysis, which can instantaneously decompose organic pollutants. Several studies have demonstrated its effectiveness, as a stand-alone process or combined with others, in the rapid decomposition (up to complete mineralization) of organic compounds in pure and complex solutions, and in the removal or inactivation of microorganisms and parasites, without production of leftover residual compounds in solution. High-energy oxidation processes (a.k.a. Advanced Oxidation & Reduction Processes—AORPs) could have a primary role in future strategies addressing emerging contaminants. Full article
(This article belongs to the Special Issue Research Advances of Removal of Pollutants by Advanced Oxidation Technologies)
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