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Journals
Catalysts
Special Issues
Photocatalytic and Enzymatic Degradation of Water Pollutants
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Photocatalytic and Enzymatic Degradation of Water Pollutants

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

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 4039

Special Issue Editors

Prof. Dr. Pedro Modesto Alvarez Pena

E-Mail Website
Guest Editor
Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Badajoz, Spain
Interests: advanced oxidation processes; catalyst preparation and characterization; water and wastewater treatment technologies
Special Issues, Collections and Topics in MDPI journals
Dr. Ana Rey

E-Mail Website
Guest Editor
Universidad de Extremadura, Departamento de Ingeniería Química y Química Física, Badajoz, Spain
Interests: advanced oxidation processes; heterogeneous catalysis; wastewater and drinking water treatment; catalytic and photocatalytic ozonation; catalytic wet peroxide oxidation; preparation and characterization of catalysts; kinetics; contaminants of emerging concern; disinfection by-products
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The presence of a growing number of pollutants of special concern in water resources has alerted the scientific community to seek sustainable and cost-efficient technologies to deal with these contaminants. Thus, research works to provide in-depth studies of methods such as biological processes, membrane and adsorption technologies or advanced oxidation processes (AOPs) to control pollution in water and wastewater are challenging.

Among these methods, photocatalysis using UV-vis radiation (typically solar radiation or from low-cost lamps such as LEDs) and a semiconductor catalyst (e.g., TiO2, WO3, etc.) to produce holes and reactive oxygen species (ROS) with oxidation potential high enough to mineralize recalcitrant pollutants leaving no toxic by-products in water is of paramount interest today. Also, studies about enzymatic degradation of water pollutants due to the selective and efficient catalytic activity of some enzymes such as laccases and peroxidases are in the research spotlight.

This special issue on Photocatalytic and enzymatic degradation of water pollutants invites contributions dealing with the synthesis, characterization and/or applications of photocatalysts in reactions with water pollutants in the presence of UV-vis radiation. Also, it calls for papers on isolation, purification and/or immobilization of enzymes with activity towards the degradation of hazardous water pollutants, including contaminants of emerging concern. Catalyst (photocatalyst and/or enzymes) activity, reaction mechanisms, reusability and the impact of process conditions and reactors on the process efficiency to remove specific water pollutants or surrogate pollution parameters such as TOC or COD are of great interest. The aim is to look for conditions that would make photocatysis and or enzyme degradation of water pollutants promising methods to be scaled-up.

Prof. Dr. Pedro Modesto Alvarez Pena
Dr. Ana Rey
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 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

  • Contaminants of emerging concern
  • Enzyme
  • Photocatalyst
  • Water and wastewater treatment

Published Papers (1 paper)

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Research

22 pages, 7308 KiB  
Article
Insights into the Stability and Activity of MIL-53(Fe) in Solar Photocatalytic Oxidation Processes in Water
by Jorge López, Ana M. Chávez, Ana Rey and Pedro M. Álvarez
Catalysts 2021, 11(4), 448; https://doi.org/10.3390/catal11040448 - 30 Mar 2021
Cited by 22 | Viewed by 3456
Abstract
MIL-53(Fe) is a metal organic framework that has been recently considered a heterogeneous photocatalyst candidate for the degradation of water pollutants under visible or solar radiation, though stability studies are rather scarce in the literature. In this work, MIL-53(Fe) was successfully synthesized by [...] Read more.
MIL-53(Fe) is a metal organic framework that has been recently considered a heterogeneous photocatalyst candidate for the degradation of water pollutants under visible or solar radiation, though stability studies are rather scarce in the literature. In this work, MIL-53(Fe) was successfully synthesized by a solvothermal method and fully characterized by X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), N2 adsorption–desorption isotherm, Thermogravimetric analysis coupled with mass spectrometry (TGA-MS), UV-visible diffuse reflectance spectroscopy (DRS), elemental analysis and wavelength dispersive X-ray fluorescence (WDXRF). The effects of pH, temperature, solar radiation and the presence of oxidants (i.e., electron acceptors) such as ozone, persulfate and hydrogen peroxide on the stability of MIL-53(Fe) in water were investigated. The as-synthetized MIL-53(Fe) exhibited relatively good stability in water at pH 4 but suffered fast hydrolysis at alkaline conditions. At pH 4–5, temperature, radiation (solar and visible radiation) and oxidants exerted negative effect on the stability of the metal–organic framework (MOF) in water, resulting in non-negligible amounts of metal (iron) and linker (terephthalic acid, H2BDC) leached out from MIL-53(Fe). The photocatalytic activity of MIL-53(Fe) under simulated solar radiation was studied using phenol and metoprolol as target pollutants. MIL-53(Fe) on its own removed less than 10% of the pollutants after 3 h of irradiation, while in the presence of ozone, persulfate or hydrogen peroxide, complete elimination of pollutants was achieved within 2 h of exposure to radiation. However, the presence of oxidants and the formation of some reaction intermediates (e.g., short-chain carboxylic acids) accelerated MIL-53(Fe) decarboxylation. The findings of this work suggest that MIL-53(Fe) should not be recommended as a heterogeneous photocatalyst for water treatment before carrying out a careful evaluation of its stability under actual reaction conditions. Full article
(This article belongs to the Special Issue Photocatalytic and Enzymatic Degradation of Water Pollutants)
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