Photocatalyzed and Electrochemical Processes for a Cleaner Environment

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

Deadline for manuscript submissions: 15 November 2024 | Viewed by 4597

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Joint Center for Research on Sustainable Chemistry UAEM-UNAM, Autonomous University of the State of Mexico, Toluca 50200, Mexico
Interests: physical and chemical removal of persistent contaminants using new and innovative biomaterials, biochar, and nanomaterials; lifecycle analysis of the chemical removal of persistent contaminants
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Special Issue Information

Dear Colleagues,

Around the globe, the natural environment has been deteriorating due to, among other factors, human activities (food, pharmaceutical and fuel production, waste management, travel, communications, etc.). The actions required to remediate such a phenomenon can be classified into two large groups: preventive and corrective. For both of them, photocatalyzed and electrochemical processes emerge as promising alternatives and, therefore, are worthy of being assessed to increase their number of applications. In the context of prevention, these processes allow us, for instance, to conduct selective partial oxidations or reductions under mild temperature and pressure conditions. Such processes can also be applied to correct an environmental problem in air, water and soil. Therefore, this Special Issue, “Photocatalyzed and electrochemical Processes for a Cleaner Environment”, is dedicated to addressing topics related with to the following:

  • Development of novel photocatalysts and electrodes;
  • Photocatalyzed and electrochemical advanced oxidation processes, i.e., photocatalysis, elctrocatalysis, electro-oxidation, electroperoxonation, electrocoagulation, photo-Fenton, electro-Fenton, and photo-electrocatalysis;
  • Reduction processes, i.e., CO2 conversion through photocatalyzed and/or electrochemical processes;
  • Selective photocatalyzed or photo-electrocatalyzed oxidations;
  • Fuels production through photocatalyzed and/or electrochemical processes;
  • Integration of photocatalyzed processes with others (adsorption, biological, ozone, electrochemical, and persulfate) for pollutant removal;
  • Plasmonic photocatalysis;
  • Water splitting;
  • Photoelectrochemical cells;
  • Photocatalysis–biocatalysis hybrid systems;
  • Electrochemical–biological cells;
  • Valorization of residues through photocatalyzed and/or electrochemical processes;
  • Life cycle assessment of photocatalyzed and/or electrochemical processes;
  • Scaling-up and optimization of photocatalyzed and/or electrochemical processes;
  • Mechanistic insights and computational studies on photocatalyzed and/or electrochemical processes.

Dr. Reyna Natividad
Guest Editor

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Keywords

  • photocatalysis
  • electrocatalysis
  • advanced oxidation processes
  • photo-fenton
  • electro-fenton
  • water splitting
  • CO2 reduction
  • electrochemical cells
  • photoelectrochemical cells (PECs)
  • photocatalysts development
  • plasmonic photocatalysis
  • life cycle assessment (LCA)
  • electrorefinery
  • electrocoagulation
  • hydrogen production

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Published Papers (2 papers)

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Research

19 pages, 4137 KiB  
Article
Au Supported on Bovine-Bone-Derived Hydroxyapatite Catalyzes CO2 Photochemical Reduction toward Methanol
by Sergio Arturo Gama-Lara, Alfredo Rafael Vilchis-Néstor, Deysi Amado-Piña and Reyna Natividad
Catalysts 2024, 14(7), 417; https://doi.org/10.3390/catal14070417 - 29 Jun 2024
Viewed by 855
Abstract
In this work, gold-photo-catalyzed CO2 transformation was conducted and the effect of three variables with two levels was investigated: support (TiO2 and hydroxyapatite from bovine bone (BB)), Au content (5 and 10%) and activation wavelength (254 and 380–700 nm). Reactions were [...] Read more.
In this work, gold-photo-catalyzed CO2 transformation was conducted and the effect of three variables with two levels was investigated: support (TiO2 and hydroxyapatite from bovine bone (BB)), Au content (5 and 10%) and activation wavelength (254 and 380–700 nm). Reactions were conducted in a stirred tank reactor by bubbling CO2 (9 × 10−3 dm3/min) in 0.1 dm3 of 0.5 M NaOH solution. The catalysts were synthesized using AuCl3, TiO2 and BB. Au nanoparticles were obtained by reduction with Hetheroteca inuloides, thus eliminating calcination and hydrogenation to reduce the gold species. By TEM, the particle size distribution was determined, and the synthesized nanoparticle sizes varied in the range of 9 to 19 nm, depending on the support and Au content. By UV–Vis spectroscopy, the energy band gaps of the prepared materials were 2.18 eV (10% Au/BB), 2.38 eV (5% Au/BB), 2.42 eV (BB), 3.39 eV (5% Au/TiO2), 3.41 eV (10% Au/TiO2) and 3.43 eV for pure TiO2. Methanol and formic and acetic acids were identified during the process. Selectivity toward methanol was found to be improved with the 10% Au/BB catalytic system. Full article
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12 pages, 6479 KiB  
Article
Simultaneous Oxidation of Emerging Pollutants in Real Wastewater by the Advanced Fenton Oxidation Process
by Alexis Rubén Bracamontes-Ruelas, Yolanda Reyes-Vidal, José Rafael Irigoyen-Campuzano and Liliana Reynoso-Cuevas
Catalysts 2023, 13(4), 748; https://doi.org/10.3390/catal13040748 - 14 Apr 2023
Cited by 5 | Viewed by 2981
Abstract
Since the conventional processes employed in most wastewater treatment plants (WWTPs) worldwide are not designed to entirely remove or oxidize emerging pollutants, which, due to their incidence and persistence, can cause damage to both the environment and human health, several options for their [...] Read more.
Since the conventional processes employed in most wastewater treatment plants (WWTPs) worldwide are not designed to entirely remove or oxidize emerging pollutants, which, due to their incidence and persistence, can cause damage to both the environment and human health, several options for their degradation and removal have emerged. Coupling the advanced Fenton oxidation process as a polishing or tertiary wastewater treatment alternative within conventional WWTP processes stands out among the treatment options. Therefore, the main objective of this research was to evaluate, at the laboratory level, the ability of the advanced Fenton oxidation process to oxidize triclosan, ibuprofen, DEET (N, N-diethyl-meta-toluamide), carbamazepine, caffeine, and acesulfame-K, which represent several groups of emerging pollutants in real wastewater from the second settling tank of a municipal WWTP. The compound used as a catalyst (Fe2+) supplier in the advanced Fenton oxidation process was ferrous sulfate heptahydrate (FeSO4•7H2O). The results obtained upon application showed that the advanced Fenton oxidation process could simultaneously oxidize and remove practically the total concentration of the above-mentioned emerging pollutants, except for DEET (85.21%), in conjunction with the chemical oxygen demand (COD), total suspended solids (TSS), and fecal coliforms (FC, pathogen group) in the effluent generated by the advanced Fenton oxidation process. Full article
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