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Catalysts
Special Issues
Electrocatalytic Wastewater Treatment: Resource Utilization and New Technology
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Electrocatalytic Wastewater Treatment: Resource Utilization and New Technology

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

Deadline for manuscript submissions: closed (31 March 2025) | Viewed by 3098

Special Issue Editors

Prof. Dr. Hao Xu

E-Mail Website
Guest Editor
Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: electrocatalytic oxidation; electrochemical scale removal; electrochemical sterilization; metal oxide electrode
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jiangtao Feng

E-Mail Website
Guest Editor
Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: electrochemical nitrate reduction; electrochemical hydrogen evolution; advanced oxidation process; adsorption
Special Issues, Collections and Topics in MDPI journals
Dr. Dan Shao

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi’an 710021, China
Interests: electrochemical oxidation; electrode material; wastewater treatment; emerging contaminant; microplastics

Special Issue Information

Dear Colleagues,

Electrocatalytic wastewater treatment uses electrons as green reagents or initiators of various reactive species to destroy pollutants in water, and is thus regarded as an alternative to traditional wastewater treatment technologies or a supporting method. In addition, hydrogen, ammonia and other value-added chemicals may be generated during the electrocatalytic wastewater treatment process, which increases the economic value of the process. In recent years, with the development of science and technology, various new electrocatalytic wastewater treatment technologies have emerged, and related fields have become the focus of scientific research. To this end, we are organizing a Special Issue focused on the development of new electrocatalytic wastewater treatment technology and resource utilization. Areas of interest include:

  • New catalysts
  • New reactors
  • New processes
  • New products

If you would like to submit papers to this Special Issue or have any questions, please contact the in-house editor, Mr. Ives Liu (ives.liu@mdpi.com).

Prof. Dr. Hao Xu
Prof. Dr. Jiangtao Feng
Dr. Dan Shao
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

  • electrochemical oxidation
  • electrochemical reduction
  • electrocatalyst
  • electrochemical reactor
  • wastewater treatment

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Published Papers (2 papers)

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Research

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17 pages, 6174 KiB  
Article
Enhancing H2O2 Generation Using Activated Carbon Electrocatalyst Cathode: Experimental and Computational Insights on Current, Cathode Design, and Reactor Configuration
by Maria del Mar Cerrillo-Gonzalez, Amir Taqieddin, Stephanie Sarrouf, Nima Sakhaee, Juan Manuel Paz-García, Akram N. Alshawabkeh and Muhammad Fahad Ehsan
Catalysts 2025, 15(2), 189; https://doi.org/10.3390/catal15020189 - 18 Feb 2025
Viewed by 566
Abstract
Granular activated carbon (GAC) serves as a cost-efficient electrocatalyst cathode in electrochemical water treatment. This study investigates the impact of current intensity and cathode mesh size on the electrocatalytic generation of reactive oxygen species (ROS), i.e., hydrogen peroxide (H2O2) [...] Read more.
Granular activated carbon (GAC) serves as a cost-efficient electrocatalyst cathode in electrochemical water treatment. This study investigates the impact of current intensity and cathode mesh size on the electrocatalytic generation of reactive oxygen species (ROS), i.e., hydrogen peroxide (H2O2) and hydroxyl radicals (•OH), for removing p-nitrophenol (PNP) as a representative contaminant. The findings suggest that these parameters exert a factorial effect on PNP removal, which is statistically endorsed via the analysis of variance. The −20 + 40 mesh GAC exhibited superior electrocatalytic performance due to its optimal balance of porosity and active surface area. Additionally, the reactor configuration was also studied. Employing two reactors in series configuration resulted in a 23% increase in H2O2 generation and a 32% enhancement in overall PNP removal compared with the single reactor configuration. This enhancement is attributed to (i) the enhanced electroactive area, (ii) the greater retention time of PNP over the electrocatalyst surface, and (iii) the increased dissolved oxygen and H2O2 content in the second reactor, promoting the overall H2O2 generation. Numerical simulations were conducted to compute H2O2 concentration profiles, providing a detailed representation of the physical, chemical, and electrochemical processes. The model exhibited a high degree of accuracy compared with the experimental measurements, with R2 values ranging from ~0.76 to 0.99 and MAE values between ~0.04 and 0.23 mg/L. The simulation results highlight a strong interplay between H2O2 generation, its reaction kinetics during PNP removal, and electrode utilization efficiency. These findings emphasize the importance of optimizing the applied current magnitude and reactor operation duration to maximize electrode efficiency and H2O2 generation and utilization, while minimizing electrochemical bubble blockage. Overall, this study provides fundamental insights to optimize the electroactive area for enhanced ROS generation toward efficient contaminant removal, supporting sustainable groundwater remediation technologies in the face of emerging pollutants. Full article
(This article belongs to the Special Issue Electrocatalytic Wastewater Treatment: Resource Utilization and New Technology)
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Review

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20 pages, 2772 KiB  
Review
Enhancing Trace Pb2⁺ Detection via Novel Functional Materials for Improved Electrocatalytic Redox Processes on Electrochemical Sensors: A Short Review
by Duowen Yang, Xinyu Wang and Hao Xu
Catalysts 2024, 14(7), 451; https://doi.org/10.3390/catal14070451 - 14 Jul 2024
Cited by 2 | Viewed by 1856
Abstract
The efficient detection of lead ions (Pb2⁺) is significant for environmental protection and public health. Electrochemical detection has emerged as one of the most promising technologies due to its low detection limits, high sensitivity, and cost-effectiveness. However, significant challenges remain, including [...] Read more.
The efficient detection of lead ions (Pb2⁺) is significant for environmental protection and public health. Electrochemical detection has emerged as one of the most promising technologies due to its low detection limits, high sensitivity, and cost-effectiveness. However, significant challenges remain, including issues related to sensitivity, selectivity, interference, and the stability of electrode materials. This review explores recent advancements in the field, focusing on integrating novel catalytic materials and innovative sensor construction methods. Particular emphasis is placed on enhancing the electrocatalytic redox processes on sensor surfaces using advanced nanomaterials such as MXenes, ferrite-based nanomaterials, carbon nanomaterials, and metal–organic frameworks (MOFs). Additionally, the role of biomaterials and enzymes in improving electrochemical sensors’ selectivity and anti-interference capabilities is discussed. Despite the impressive low detection limits achieved, real-world applications present additional challenges due to the complex composition of environmental samples. The review concludes with future perspectives on overcoming these challenges by leveraging the unique properties of catalytic materials to develop more effective and reliable electrochemical sensors for trace Pb2⁺ detection. Full article
(This article belongs to the Special Issue Electrocatalytic Wastewater Treatment: Resource Utilization and New Technology)
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