Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
6.3
3.9
Journals
Catalysts
Special Issues
Advanced Oxidation Treatment of Refractory Polluted Wastewaters
share announcement

Advanced Oxidation Treatment of Refractory Polluted Wastewaters

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

Deadline for manuscript submissions: closed (15 April 2022) | Viewed by 9175

Special Issue Editor

Dr. Paula Oulego

E-Mail Website
Guest Editor
Department of Chemical and Environmental Engineering, University of Oviedo, 33001 Oviedo, Spain
Interests: advanced oxidation processes; (nano)materials synthesis; (nano)materials characterization; catalysis; waste valorization; wastewater treatment

Special Issue Information

Dear Colleagues,

Water scarcity is an issue of great concern due to increasing population and urbanization. Therefore, a proper management of wastewaters is essential to tackle this problem. A variety of conventional methodologies have been developed to treat wastewaters, biological ones being the most widely used. However, wastewaters generated in landfills or industrial process (pulp and paper, refineries, textile industries, etc.) generally contain refractory organic pollutants that are highly toxic and/or non-biodegradable, thus making their direct biological treatment not possible. Advanced oxidation processes are suitable technologies for treatment of these recalcitrant pollutants, since powerful hydroxyl or sulfate radicals as major oxidizing agents are used.

This Special Issue aims to cover the most recent progress and advances in the field of advanced oxidation processes focused on the treatment of refractory wastewaters. This includes but is not limited to activated persulfate, cavitation, electrochemical oxidation, ozonation, photocatalysis, Fenton-based processes, wet air oxidation, and supercritical oxidation and wet peroxide oxidation. This Special Issue also welcomes submissions on novel catalytic materials, hybrid treatment (combination of physicochemical treatments), pilot-scale studies, simulation of wastewater treatment, and assessment of toxicity of treated wastewaters.

Dr. Paula Oulego
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

  • Advanced oxidation processes
  • Catalysis
  • Nanomaterials
  • Non-supported catalysts
  • Refractory pollutants
  • Supported catalysts
  • Toxicity
  • Wastewaters

Published Papers (3 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

11 pages, 2095 KiB  
Article
Evaluation of Kinetic Pseudo-Order in the Photocatalytic Degradation of Ofloxacin
by Giora Rytwo and Arye Lev Zelkind
Catalysts 2022, 12(1), 24; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12010024 - 26 Dec 2021
Cited by 22 | Viewed by 4037
Abstract
Ofloxacin is a highly efficient and widely used antibiotic drug. It is classified as a refractory pollutant due to its poor biodegradability. Consequently, it is commonly found in water sources, requiring efficient methods for its removal. Advanced oxidation processes (AOPs) offer efficient alternatives [...] Read more.
Ofloxacin is a highly efficient and widely used antibiotic drug. It is classified as a refractory pollutant due to its poor biodegradability. Consequently, it is commonly found in water sources, requiring efficient methods for its removal. Advanced oxidation processes (AOPs) offer efficient alternatives since those yield complete degradation not achieved in adsorption or membrane processes. Previous studies suggest ofloxacin degradation follows a pseudo-first or -second order processes, whereas for full removal of refractory pollutants—lower pseudo-orders are required. Monitoring the actual “pseudo-order” degradation kinetics of ofloxacin is needed to evaluate any proposed AOP process. This study presents a simple procedure to evaluate pseudo-orders of AOPs. Photolysis of 20 μM ofloxacin solutions follow pseudo-zero order kinetics, with half-life times (t1/2) of approx. 60 min. TiO2 heterogenous catalysts have been shown to have no influence at low concentrations (0.2 mg L−1), but a significant reduction of half-life time (t1/2 = 20 min) and increase in pseudo-order (0.8) is measured at 2.0 mg L−1. Similar results are obtained with homogenous catalysis by 2.0 mg L−1 H2O2. The combination of H2O2 and TiO2 catalysts shows additional reduction in half-time life with increase in the pseudo-order to 1.2. The conclusions are (1) heterogenous and homogenous photocatalysis can effectively degrade ofloxacin, (2) combined photocatalysis yields higher pseudo-order, being less prone to achieve full removal, and (3) analysis of specific pseudo-orders in AOPs of refractory pollutants helps to further elucidate the efficiency of the processes. Full article
(This article belongs to the Special Issue Advanced Oxidation Treatment of Refractory Polluted Wastewaters)
►▼ Show Figures

Figure 1

15 pages, 4109 KiB  
Article
Synthesis of Oxygen Deficient TiO2 for Improved Photocatalytic Efficiency in Solar Radiation
by Kassim Olasunkanmi Badmus, Francois Wewers, Mohammed Al-Abri, Mohd Shahbaaz and Leslie F. Petrik
Catalysts 2021, 11(8), 904; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11080904 - 26 Jul 2021
Cited by 6 | Viewed by 1963
Abstract
The photocatalytic activities of TiO2 have been limited mainly to absorbing in the ultraviolet spectrum which accounts for only 5% of solar radiation. High energy band gap and electron recombination in TiO2 nanoparticles are responsible for its limitations as a photocatalyst. [...] Read more.
The photocatalytic activities of TiO2 have been limited mainly to absorbing in the ultraviolet spectrum which accounts for only 5% of solar radiation. High energy band gap and electron recombination in TiO2 nanoparticles are responsible for its limitations as a photocatalyst. An oxygen deficient surface can be artificially created on the titanium oxide by zero valent nano iron through the donation of its excess electrons. A visible light active TiO2 nanoparticle was synthesized in the current investigation through simple chemical reduction using sodium boro-hydride. The physical and textural properties of the synthesized oxygen deficient TiO2 photocatalyst was measured using scanning/ transmission electron microscopy while FTIR, XRD and nitrogen sorption methods (BET) were employed for its further characterizations. Photochemical decoloration of orange II sodium dye solution in the presence of the synthesized TiO2 was measured using an UV spectrophotometer. The resulting oxygen deficient TiO2 has a lower energy band-gap, smaller pore sizes, and enhanced photo-catalytic properties. The decoloration (88%) of orange (II) sodium salt solution (pH 2) under simulated solar light was possible at 20 min. This study highlights the effect of surface oxygen defects, crystal size and energy band-gap on the photo-catalytical property of TiO2 nanoparticles as impacted by nano zero valent iron. It opens a new window in the exploitation of instability in the dopant ions for creation of a visible light active TiO2 photocatalyst. Full article
(This article belongs to the Special Issue Advanced Oxidation Treatment of Refractory Polluted Wastewaters)
►▼ Show Figures

Graphical abstract

14 pages, 2682 KiB  
Article
Electrochemical Degradation of Methylene Blue Using a Ni-Co-Oxide Anode
by Emmanuel Onyekachi Nwanebu, Xiaocheng Liu, Elmira Pajootan, Viviane Yargeau and Sasha Omanovic
Catalysts 2021, 11(7), 793; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11070793 - 29 Jun 2021
Cited by 8 | Viewed by 2409
Abstract
The potential of using thermally prepared Ni0.6Co0.4-oxide for the electrochemical degradation of organic contaminants was investigated using methylene blue (MB) in an aqueous solution, as a model pollutant. The results of UV spectroscopy obtained during galvanostatic electrolyses at the [...] Read more.
The potential of using thermally prepared Ni0.6Co0.4-oxide for the electrochemical degradation of organic contaminants was investigated using methylene blue (MB) in an aqueous solution, as a model pollutant. The results of UV spectroscopy obtained during galvanostatic electrolyses at the anode indicated the complete removal of the methylene blue dye. The high removal of chemical oxygen demand (COD) and total organic carbon (TOC) suggested a high level of mineralization of its intermediates. It was found that the electrocatalytic performance of the electrode in the anodic degradation of the organic pollutant was significantly enhanced by the presence of chloride ions in the solution. The improvement in the degradation rate of MB was attributed to the in situ electrogeneration of chlorine active species. The results show that Ni0.6Co0.4-oxide anode can be employed as a stable energy-efficient electrocatalyst in the electrochemical purification of wastewater. Full article
(This article belongs to the Special Issue Advanced Oxidation Treatment of Refractory Polluted Wastewaters)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-3
Back to TopTop