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Catalysts
Special Issues
Recent Advances in Photocatalytic Degradation of Pollutants in Wastewater
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Recent Advances in Photocatalytic Degradation of Pollutants in Wastewater

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

Deadline for manuscript submissions: 31 May 2024 | Viewed by 3509

Special Issue Editor

Dr. Han Gong

E-Mail Website
Guest Editor
College of Marine Sciences, South China Agricultural University, Guangzhou 510000, China
Interests: water/wastewater treatment, advanced oxidation processes, emerging pollutants, toxicology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Due to the rapid development of the economy, various pollutants have been discharged into the water environment. Emerging pollutants, including endocrine-disrupting compounds (EDCs), persistent organic pollutants (POPs), pharmaceuticals and personal care products (PPCPs), microplastics (MPs), nanoparticles (NPs), etc., are frequently detected in water and wastewater. The removal-resistant pollutants bring tremendous challenges to water and wastewater treatment. Novel water/wastewater treatment technologies, e.g., advanced oxidation processes (AOPs), are regarded as promising technologies, with photocatalysis attracting great intertest.

This Special Issue aims to collect recent advances in the photocatalytic degradation of pollutants in wastewater. Original research, reviews, and perspectives focusing on but not limited to the following scopes are all welcome:

  • The development of novel heterogeneous photocatalysts;
  • The development of novel homogeneous photocatalytic processes;
  • Photocatalytic degradation of pollutants from wastewater;
  • Reaction kinetics of photocatalytic degradation;
  • New analytical techniques to probe the reaction intermediates during photocatalysis;
  • Toxicity transformation of contaminants during photocatalysis;
  • The effects of environmental factors on the performance of photocatalysis.

If you would like to submit papers to this Special Issue or have any questions, please contact the editor, Mr. Ives Liu ([email protected]).

Dr. Han Gong
Guest Editor

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 2700 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

  • wastewater treatment
  • photocatalysis
  • novel catalyst
  • pollutants
  • degradation
  • VUV
  • UV
  • LED
  • VIS
  • solar light

Published Papers (2 papers)

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Research

34 pages, 5147 KiB  
Article
Optimization of ZnO Nanoparticles’ Synthesis via Precipitation Method Applying Taguchi Robust Design
by Maria-Anna Gatou, Katerina Kontoliou, Eleni Volla, Konstantinos Karachalios, Grigorios Raptopoulos, Patrina Paraskevopoulou, Nefeli Lagopati and Evangelia A. Pavlatou
Catalysts 2023, 13(10), 1367; https://doi.org/10.3390/catal13101367 - 13 Oct 2023
Cited by 2 | Viewed by 1566
Abstract
Zinc oxide (ZnO) possesses exceptional potential to be utilized in water and wastewater treatment applications, either as a photocatalyst or in membrane incorporation. In the present study, ZnO nanoparticles were synthesized using the precipitation method. The Taguchi approach with the L32b orthogonal [...] Read more.
Zinc oxide (ZnO) possesses exceptional potential to be utilized in water and wastewater treatment applications, either as a photocatalyst or in membrane incorporation. In the present study, ZnO nanoparticles were synthesized using the precipitation method. The Taguchi approach with the L32b orthogonal array was utilized in order to optimize the experimental conditions for the synthesis of the nanoparticles and to ensure that relatively smaller-sized particles were obtained. The design was characterized by ten factors, where nine of them possessed four levels, while one had two levels. This study’s design factors were the type of Zn precursor, the concentration of the Zn precursor, the type of precipitating agent, the precipitation agent’s concentration, the type of utilized solvent, the pH value of the solvent, the temperature used during the synthetic procedure, the calcination temperature, the time of stirring during synthesis, as well as the stirring speed. The influences of those factors on the selected response parameters (the average crystallite size, degree of crystallinity, energy band gap (Eg), and photodegradation constant (k)) were then evaluated. XRD analysis and the calculated Eg values indicated that the hexagonal wurtzite structure was the only crystalline phase present in the produced samples. The photocatalytic efficiency of all ZnO nanoparticles was examined in the degradation of rhodamine B under UV light irradiation. The optimal conditions were achieved using zinc acetate dihydrate as the Zn precursor at a concentration equal to 0.3 M, sodium hydroxide as the precipitating agent (1.5 M), methanol as the solvent (the pH value of the solvent was equal to 13), a temperature during the synthetic procedure of 70 °C, 600 °C as calcination temperature, a 90 min stirring time, and 700 rpm as the stirring speed. The optimized ZnO sample was synthesized based on the aforementioned conditions and thoroughly characterized. The acquired results confirmed the prediction of the Taguchi approach, and the most enhanced k-value was observed. Full article
(This article belongs to the Special Issue Recent Advances in Photocatalytic Degradation of Pollutants in Wastewater)
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15 pages, 17704 KiB  
Article
Enhanced Solar Light-Driven Photocatalytic Degradation of Tetracycline Using Fe3+-Doped CdO/ZnS Nanocomposite: Mechanistic Insights and Performance Evaluation
by R. Joyce Stella, I. Sreevani, Thirumala Rao Gurugubelli, R. V. S. S. N. Ravikumar and Ravindranadh Koutavarapu
Catalysts 2023, 13(9), 1312; https://doi.org/10.3390/catal13091312 - 21 Sep 2023
Cited by 1 | Viewed by 1548
Abstract
In recent years, studies on the efficient spatial charge separation for broad solar light absorption and water remediation have been a major priority. Moreover, the development of transition metal-doped nanocomposites for this purpose is a new endeavor in current research. Here, we constructed [...] Read more.
In recent years, studies on the efficient spatial charge separation for broad solar light absorption and water remediation have been a major priority. Moreover, the development of transition metal-doped nanocomposites for this purpose is a new endeavor in current research. Here, we constructed an Fe3+-doped CdO/ZnS nanocomposite with a low doping level and investigated the effect of doping on the charge transfer and recombination behavior for improved photocatalytic performance. The X-ray diffraction analysis results indicate that both materials, CdO and ZnS, exhibit a cubic phase structure with an average crystallite size of 35 nm. Morphology analysis of the Fe3+-doped CdO/ZnS nanocomposite confirms the formation of irregularly shaped particle-like structures. From the optical studies, the bandgap energies of CdO/ZnS and Fe3+-doped CdO/ZnS nanocomposites are 3.19 eV and 2.87 eV, respectively, which proved that the iron ions doping reduced the bandgap energy and extended the absorption to the visible range. The efficiency of photodegradation in the tested samples was evaluated using tetracycline under solar light exposure. The experimental results demonstrated that the Fe3+-doped CdO/ZnS nanocomposite outperformed the other samples, exhibiting a significantly higher photocatalytic activity. After 80 min, it achieved a remarkable degradation rate of 97.06%. The Fe3+-doped CdO/ZnS nanocomposite demonstrated good stability and recyclability after five cycles. Radical trapping experiments showed that hydroxyl (•OH) radicals play a key role in photodegradation. Full article
(This article belongs to the Special Issue Recent Advances in Photocatalytic Degradation of Pollutants in Wastewater)
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