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Applied Sciences
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Electrochemical Technologies in Water and Wastewater Treatment
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Electrochemical Technologies in Water and Wastewater Treatment

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

Deadline for manuscript submissions: closed (10 October 2022) | Viewed by 5196

Special Issue Editors

Prof. Dr. Carlos Alberto Martinez Huitle

E-Mail Website
Guest Editor
Departamento de Química, Universidade Federal do Rio Grande do Norte, Natal, Brazil
Interests: analytical chemistry; electrochemistry; environmental chemistry; water/wastewater treatment; photocatalysis; electrochemical techniques
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Achille De Battisti

E-Mail Website
Guest Editor
Department of Chemistry, University of Ferrara, Ferrara, Italy
Interests: electrochemistry; environmental chemistry; catalysis; water/wastewater treatment

Special Issue Information

Dear Colleagues,

Over the last two decades, significant efforts have been made by several research groups all around the world in order to develop electrochemically based alternatives to conventional water and wastewater treatment technologies. The advances in this interdisciplinary area have recently encouraged close collaboration between chemists, electrochemists, engineers, and other scientists, particularly in the use of these alternative technologies for decontamination and disinfection of different kinds of effluents as well as water matrices. This Special Issue aims to summarize the current development status of these promising technologies and to point out their strengths and weaknesses. Scientific contributions dealing with processes such as electrochemical reduction, electrocoagulation, electroflotation, and electrochemical oxidation, emphasizing the fundamentals and new approaches developed, are welcome. Papers focusing on electrocatalytic material, the key component of the electrochemical cell, related to different types of electrodes that have been developed in recent years in terms of preparation methods, properties, and performance in the electrochemical treatment of wastewater are particularly welcome. Reports regarding the recent advances in electrogeneration of powerful oxidants (hydroxyl radical, active chlorine, persulfate, ozone, hydrogen peroxide, ferrate, and so on) are also expected.

Papers focused on the latest knowledge and innovation regarding the fast destruction of pollutants by the electro-Fenton process or by photo-assisted electrochemical methods are also of interest, as are those concerning novel electrochemical technologies (hybrid and sequential processes as well as microbial fuel cells) that can be used for treating water and wastewaters. Likewise, attention can be focused on the direct use of sunlight, with a description of emerging solar photo-electrochemical assisted processes. The main aspects of other novel, combined technologies involving photocatalysis, adsorption, nanofiltration, microwaves, and ultrasounds, among others, can also be pointed out. Contributions dealing with the chemical and technological advantages and disadvantages determining the applicability of electrochemical approaches, as well as the possibility of combining renewable energies with electrochemical technologies towards wastewater treatment, are also welcome. Other specific topics could also be covered, including discussions of advantages and recent innovations, challenges associated with the implementation of electrochemical advanced oxidation processes, and future research and engineering needs.

Based on the wide gamut of subjects considered in the Special Issue, it should be of interest to a large number of diverse readers such as researchers, industry experts, public administrators, and students who are interested in both wastewater treatment and electrochemical processes. In addition, this issue could be used for chemistry, electrochemistry, engineering, materials science, biotechnology, environmental engineering, and chemical engineering researchers and students focused on electrochemical advanced oxidation processes. We strongly believe that the future for electrochemical processes is bright, and we expect society to benefit from their applications.

Prof. Dr. Carlos Alberto Martinez Huitle
Prof. Dr. Achille De Battisti
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. Applied Sciences 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 2400 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

  • electrochemical technologies
  • real application
  • advantages and disadvantages
  • electrocatalytic materials
  • hybrid processes
  • chemical/electrochemical mechanisms and models
  • oxidants
  • waste valorization

Published Papers (3 papers)

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Research

12 pages, 929 KiB  
Article
Development of an Advanced Inspection of the Degradation of Volatile Organic Compounds in Electrochemical Water Treatment of Paint-Industrial Water Effluents
by Agneša Szarka, Veronika Mihová, Gabriel Horváth and Svetlana Hrouzková
Appl. Sci. 2023, 13(1), 443; https://doi.org/10.3390/app13010443 - 29 Dec 2022
Cited by 6 | Viewed by 1275
Abstract
This study presents a compact system developed to treat paint-industrial water contaminated by the residues of volatile organic compounds (VOCs) using hybrid electrothermochemical wastewater treatment technology. Different treatment parameters (sample dilution, working current) were studied, and the power of the removal was expressed [...] Read more.
This study presents a compact system developed to treat paint-industrial water contaminated by the residues of volatile organic compounds (VOCs) using hybrid electrothermochemical wastewater treatment technology. Different treatment parameters (sample dilution, working current) were studied, and the power of the removal was expressed by the removal efficiency factor. It was shown that for all of the VOCs, significant removal was obtained with dilution 1:3 (industrial water: deionized water, V:V) and electric current set at 30 A. For advanced inspection of the treatment process, a simple and solventless method has been developed and validated, using headspace sampling combined with gas chromatography-mass spectrometry. Parameters affecting the headspace sampling efficiency were thoroughly studied, including the temperature, time, and mixing rate. The proposed method was partially validated utilizing the selected sampling parameters. The limits of detection ranged between 0.19 µg/L and 4.02 μg/L. The validated analytical method was an efficient tool for the inspection of residual VOCs in paint-industrial water and treated water samples. The new electrochemical water treatment was shown to be helpful in the paint industry’s effluent reuse. Full article
(This article belongs to the Special Issue Electrochemical Technologies in Water and Wastewater Treatment)
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14 pages, 45106 KiB  
Article
Electrochemical and Spectral Studies on Benzylidenerhodanine for Sensor Development for Heavy Metals in Waters
by Ovidiu Teodor Matica, Alina Giorgiana Brotea, Eleonora-Mihaela Ungureanu and Amalia Stefaniu
Appl. Sci. 2022, 12(5), 2681; https://doi.org/10.3390/app12052681 - 4 Mar 2022
Cited by 2 | Viewed by 1499
Abstract
Electrochemical and spectral studies of benzylidenerhodanine (BR) were performed in order to develop new sensors for heavy metals (HMs) based on chemically modified electrodes (CMEs). CMEs were obtained by cycling and by controlled potential electrolysis at different potentials and charges. Film [...] Read more.
Electrochemical and spectral studies of benzylidenerhodanine (BR) were performed in order to develop new sensors for heavy metals (HMs) based on chemically modified electrodes (CMEs). CMEs were obtained by cycling and by controlled potential electrolysis at different potentials and charges. Film formation was demonstrated by recording the CV curves of CMEs in transfer solutions containing ferrocene in 0.1 M TBAP/CH3CN. BR-CMEs were used for the analysis of HMs. Samples of Cd(II), Pb(II), Cu(II), and Hg(II), each possessing concentrations between 10−7 and 10−5 M, were analyzed by using CMEs prepared in different conditions. The most intense signal was obtained for the Pb(II) ion. These BR-CMEs can be used for the analysis of Pb(II) in monitored waters. An electrochemical study was performed at different concentrations of BR in 0.1 M TBAP/CH3CN on a glassy carbon electrode by differential pulse voltammetry, cyclic voltammetry, and rotating disk electrode voltammetry. The complexation ratio in the homogeneous solution has been established by the Mollard method in acetonitrile solutions. Full article
(This article belongs to the Special Issue Electrochemical Technologies in Water and Wastewater Treatment)
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13 pages, 1867 KiB  
Article
Achieving Electrochemical-Sustainable-Based Solutions for Monitoring and Treating Hydroxychloroquine in Real Water Matrix
by Danyelle Medeiros de Araújo, Elisama V. Dos Santos, Carlos A. Martínez-Huitle and Achille De Battisti
Appl. Sci. 2022, 12(2), 699; https://doi.org/10.3390/app12020699 - 11 Jan 2022
Cited by 8 | Viewed by 1518
Abstract
Hydroxychloroquine (HCQ) has been extensively consumed due to the Coronavirus (COVID-19) pandemic. Therefore, it is increasingly found in different water matrices. For this reason, the concentration of HCQ in water should be monitored and the treatment of contaminated water matrices with HCQ is [...] Read more.
Hydroxychloroquine (HCQ) has been extensively consumed due to the Coronavirus (COVID-19) pandemic. Therefore, it is increasingly found in different water matrices. For this reason, the concentration of HCQ in water should be monitored and the treatment of contaminated water matrices with HCQ is a key issue to overcome immediately. Thus, in this study, the development of technologies and smart water solutions to reach the Sustainable Development Goal 6 (SDG6) is the main objective. To do that, the integration of electrochemical technologies for their environmental application on HCQ detection, quantification and degradation was performed. Firstly, an electrochemical cork-graphite sensor was prepared to identify/quantify HCQ in river water matrices by differential pulse voltammetric (DPV) method. Subsequently, an HCQ-polluted river water sample was electrochemically treated with BDD electrode by applying 15, 30 and 45 mA cm−2. The HCQ decay and organic matter removal was monitored by DPV with composite sensor and chemical oxygen demand (COD) measurements, respectively. Results clearly confirmed that, on the one hand, the cork-graphite sensor exhibited good current response to quantify of HCQ in the river water matrix, with limit of detection and quantification of 1.46 mg L−1 (≈3.36 µM) and 4.42 mg L−1 (≈10.19 µM), respectively. On the other hand, the electrochemical oxidation (EO) efficiently removed HCQ from real river water sample using BDD electrodes. Complete HCQ removal was achieved at all applied current densities; whereas in terms of COD, significant removals (68%, 71% and 84% at 15, 30 and 45 mA cm−2, respectively) were achieved. Based on the achieved results, the offline integration of electrochemical SDG6 technologies in order to monitor and remove HCQ is an efficient and effective strategy. Full article
(This article belongs to the Special Issue Electrochemical Technologies in Water and Wastewater Treatment)
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