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Toxics
Special Issues
Effective Catalytic Processes for Water and Wastewater Treatment
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Effective Catalytic Processes for Water and Wastewater Treatment

A special issue of Toxics (ISSN 2305-6304). This special issue belongs to the section "Toxicity Reduction and Environmental Remediation".

Deadline for manuscript submissions: closed (25 August 2024) | Viewed by 6112

Special Issue Editors

Prof. Dr. Tao Zeng

E-Mail Website
Guest Editor
College of Environment, Zhejiang University of Technology, Hangzhou, China
Interests: environmental nanotechnology; advanced water purification technologies; treatment of emerging contaminants
Dr. Jie Yu

E-Mail Website
Guest Editor
College of Quality & Safety Engineering, China Jiliang University, Hangzhou, China
Interests: water pollution control technology; environmental functional materials; catalytic interface processes

Special Issue Information

Dear Colleagues,

Water scarcity and pollution have become significant global challenges, affecting both the environment and public health. In response to these critical issues, this Special Issue aims to address the development of effective catalytic processes for water and wastewater treatment. The demand for sustainable and efficient technologies has escalated with the growing need for clean water resources. This Special Issue invites researchers to contribute original papers, reviews, and communications focusing on advanced catalytic methods for water purification, pollutant removal, and wastewater treatment. Our aim is to explore novel and eco-friendly catalytic approaches that enhance water quality, ensure water availability, and promote a cleaner environment. Topics of interest include, but are not limited to, the following:

  1. Advanced oxidation processes (AOPs) for water purification.
  2. Nanocatalysts for contaminant removal.
  3. Catalytic material design and synthesis for water treatment.
  4. Heterogeneous and homogeneous catalysis in water purification.
  5. Novel catalysts for emerging pollutant degradation.
  6. Catalytic ozonation and photocatalysis for wastewater treatment.
  7. Catalytic reactors and their application in water purification.
  8. Catalytic removal of heavy metals and organic pollutants.
  9. Sustainable and eco-friendly catalytic approaches for water treatment.

We encourage researchers and scientists in the field of water and wastewater treatment to contribute their valuable research to this Special Issue. The aim is to foster knowledge exchange and promote advancements in effective catalytic processes for sustainable water management.

Prof. Dr. Tao Zeng
Dr. Jie Yu
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. Toxics 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 2600 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

  • catalytic processes
  • water treatment
  • wastewater treatment
  • water purification
  • pollutant removal
  • advanced oxidation processes
  • environmental catalysts
  • nanomaterials for water treatment
  • remediation of water pollutants

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Published Papers (4 papers)

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Research

16 pages, 20893 KiB  
Article
Degradation of Sodium Acetate by Catalytic Ozonation Coupled with MnOx/NiOOH-Modified Fly Ash
by Ruifu Chen, Hao Zhang, Shengyu Shao, Huajun Xu, Kaicheng Zhou, Yinzhi Jiang and Pengfei Sun
Toxics 2024, 12(6), 412; https://doi.org/10.3390/toxics12060412 - 4 Jun 2024
Viewed by 871
Abstract
Fly ash, a type of solid waste generated in power plants, can be utilized as a catalyst carrier to enhance its value-added potential. Common methods often involve using a large amount of alkali for preprocessing, resulting in stable quartz and mullite forming silicate [...] Read more.
Fly ash, a type of solid waste generated in power plants, can be utilized as a catalyst carrier to enhance its value-added potential. Common methods often involve using a large amount of alkali for preprocessing, resulting in stable quartz and mullite forming silicate dissolution. This leads to an increased specific surface area and pore structure. In this study, we produced a catalyst composed of MnOx/NiOOH supported on fly ash by directly employing nickel hydroxide and potassium permanganate to generate metal active sites over the fly ash surface while simultaneously creating a larger specific surface area and pore structure. The ozone catalytic oxidation performance of this catalyst was evaluated using sodium acetate as the target organic matter. The experimental results demonstrated that an optimal removal efficiency of 57.5% for sodium acetate was achieved, surpassing even that of MnOx/NiOOH supported catalyst by using γ-Al2O3. After loading of MnOx/NiOOH, an oxygen vacancy is formed on the surface of fly ash, which plays an indirect oxidation effect on sodium acetate due to the transformation of ozone to •O2− and •OH over this oxygen vacancy. The reaction process parameters, including varying concentrations of ozone, sodium acetate, and catalyst dosage, as well as pH value and the quantitative analysis of formed free radicals, were examined in detail. This work demonstrated that fly ash could be used as a viable catalytic material for wastewater treatment and provided a new solution to the added value of fly ash. Full article
(This article belongs to the Special Issue Effective Catalytic Processes for Water and Wastewater Treatment)
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16 pages, 4995 KiB  
Article
Sustainable Electrochemical Activation of Self-Generated Persulfate for the Degradation of Endocrine Disruptors: Kinetics, Performances, and Mechanisms
by Xiaofeng Tang, Zhiquan Jin, Rui Zou, Yi Zhu, Xia Yao, Mengxuan Li, Shuang Song, Shuangliu Liu and Tao Zeng
Toxics 2024, 12(2), 156; https://doi.org/10.3390/toxics12020156 - 17 Feb 2024
Cited by 1 | Viewed by 1643
Abstract
This study presents an electrolysis system utilizing a novel self-circulation process of sulfate (SO42−) and persulfate (S2O82−) ions based on a boron-doped diamond (BDD) anode and an activated carbon fiber (ACF) cathode, which is designed [...] Read more.
This study presents an electrolysis system utilizing a novel self-circulation process of sulfate (SO42−) and persulfate (S2O82−) ions based on a boron-doped diamond (BDD) anode and an activated carbon fiber (ACF) cathode, which is designed to enable electrochemical remediation of environmental contaminants with reduced use of chemical reagents and minimized residues. The production of S2O82− and hydrogen peroxide (H2O2) on the BDD anode and ACF cathode, respectively, is identified as the source of active radicals for the contaminant degradation. The initiator, sulfate, is identified by comparing the degradation efficiency in NaSO4 and NaNO3 electrolytes. Quenching experiments and electron paramagnetic resonance (EPR) spectroscopy confirmed that the SO4−· and ·OH generated on the ACF cathode are the main reactive radicals. A comparison of the degradation efficiency and the generated S2O82−/H2O2 of the divided/undivided electrolysis system is used to demonstrate the superiority of the synergistic effect between the BDD anode and ACF cathode. This work provides evidence of the effectiveness of the philosophy of “catalysis in lieu of supplementary chemical agents” and sheds light on the mechanism of the generation and transmission of reactive species in the BDD and ACF electrolysis system, thereby offering new perspectives for the design and optimization of electrolysis systems. Full article
(This article belongs to the Special Issue Effective Catalytic Processes for Water and Wastewater Treatment)
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15 pages, 7276 KiB  
Article
Facile Synthesis of a Novel AgIO3/CTF Heterojunction and Its Adsorption–Photocatalytic Performance with Organic Pollutants
by Liqiang Shen, Tingting Ye, Yehui Chen, Bei Chu, Hui Chen, Jinxing Hu and Yan Yu
Toxics 2024, 12(2), 133; https://doi.org/10.3390/toxics12020133 - 6 Feb 2024
Viewed by 1499
Abstract
With the development of modern industry, the issue of water pollution has garnered increasing attention. Photocatalysis, as a novel green environmental technology that is resource-efficient, environmentally friendly, and highly promising, has found extensive applications in the field of organic pollutant treatment. However, common [...] Read more.
With the development of modern industry, the issue of water pollution has garnered increasing attention. Photocatalysis, as a novel green environmental technology that is resource-efficient, environmentally friendly, and highly promising, has found extensive applications in the field of organic pollutant treatment. However, common semiconductor materials exhibit either a relatively low photocatalytic efficiency in the visible light range or an inefficient separation of photogenerated charges, resulting in their limited ability to harness solar energy effectively. Consequently, the development of new photocatalysts has become a pivotal focus in current photocatalysis research to enhance solar energy utilization. This research provides a brief explanation of the photocatalytic mechanism of the AgIO3/CTF heterojunction photocatalyst. Due to the localized surface plasmon resonance (LSPR) effect, the Ag nanoparticles demonstrate significant absorption in the visible light region, playing a crucial role in the highly efficient photocatalytic reduction of organic pollutants. Full article
(This article belongs to the Special Issue Effective Catalytic Processes for Water and Wastewater Treatment)
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11 pages, 4140 KiB  
Article
Effects of Cu (II) on the Growth of Chlorella vulgaris and Its Removal Efficiency of Pollutants in Synthetic Piggery Digestate
by Yaqiong Zeng, Xiaoqing Chen, Jiaming Zhu, Dingbiao Long, Yue Jian, Qiong Tan and Hao Wang
Toxics 2024, 12(1), 56; https://doi.org/10.3390/toxics12010056 - 11 Jan 2024
Cited by 2 | Viewed by 1660
Abstract
C. vulgaris has a positive effect on the removal of nutrients from pig farm biogas slurry. However, swine wastewater often contains heavy metal ions, such as Cu (II), which may have impacts on the nutrient removal performance of C. vulgaris. Additionally, the [...] Read more.
C. vulgaris has a positive effect on the removal of nutrients from pig farm biogas slurry. However, swine wastewater often contains heavy metal ions, such as Cu (II), which may have impacts on the nutrient removal performance of C. vulgaris. Additionally, the heavy metal ions in wastewater can be adsorbed by microalgae. In this study, the stress effect of Cu (II) on the growth of Chlorella vulgaris, the Cu (II) removal by microalgae, and the effect of different concentrations of Cu (II) on the nutrient removal efficiency of C. vulgaris in biogas slurries were explored. The results showed that the microalgae biomass of microalgae on the sixth day of the experiment was the highest in the treatment with a Cu (II) concentration of 0.5 mg/L, which was 30.1% higher than that of the 2.5 mg/L group. C. vulgaris had higher removal efficiencies of Cu (II) at a Cu (II) concentration of 0.1~1.5 mg/L. The–OH, C=O, –COOH, and C–O groups on the surface of the algal cells play a significant role in the removal of Cu (II). The removal rates of COD, NH3–N, TN, and TP by C. vulgaris at a Cu (II) concentration of 0.5 mg/L were the highest, which were 89.0%, 53.7%, 69.6%, and 47.3%, respectively. Full article
(This article belongs to the Special Issue Effective Catalytic Processes for Water and Wastewater Treatment)
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