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Processes
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Wastewater Treatment by Advanced Oxidation Processes
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Wastewater Treatment by Advanced Oxidation Processes

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: closed (31 August 2022) | Viewed by 6916

Special Issue Editors

Dr. Maria Jose Martin de Vidales

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Guest Editor
Mechanical, Chemical and Industrial Design Engineering Department, ETSIDI, Universidad Politécnica de Madrid (UPM), 28012 Madrid, Spain
Interests: wastewater treatment; advanced oxidation processes; photocatalytic processes; electrochemical processes; removal of contaminants of emerging concern from water and wastewater; scaling-up of wastewater treatments; coupling of different advanced oxidation processes
Special Issues, Collections and Topics in MDPI journals
Dr. Sara Mateo Fernandez

E-Mail Website
Guest Editor
Department of Chemical Engineering, Autonomous University of Madrid, Cantoblanco, 28049 Madrid, Spain
Interests: bioelectrochemistry; wastewater treatment; water regeneration; electrochemistry; microbial fuel cell; environmental biotechnology
Special Issues, Collections and Topics in MDPI journals
Dr. José Fernando Pérez

E-Mail Website
Guest Editor
Department of Chemical Engineering, Universidad de Castilla-La Mancha, 13001 Ciudad Real, Spain
Interests: sustainability; water; wastewater; potabilization; advanced oxidation processes; electrochemistry

Special Issue Information

Dear Colleagues,

In recent years, society has become concerned with the presence of persistent contaminants in water and wastewater, because they cannot be easily removed by conventional treatments and, even at low concentrations, can entail problems for public health such as disorders in endocrine and neurological systems, reproductive capabilities, and the hormonal control or various types of cancer (breast, ovary, prostate, testes, etc.). Thus, if conventional treatments performed in municipal wastewater treatment plants (MWTPs) fail to completely remove them from wastewater, it is necessary to look for alternative treatments. In this context, advanced oxidation processes (AOPs) such as photocatalytic processes, electrochemical processes, ozonation, Fenton, etc. are considered as a good option for the treatment of wastewater polluted with these pollutants, because they are a very efficient technology for the removal of a great variety of organic pollutants thanks to the massive generation of hydroxyl radicals and many other mediated oxidants produced at high concentrations on the anode surface. The robustness and high efficiency of this approach has been checked in many works for the treatment of water and wastewater polluted with different organic compounds, and now scientific effort is focused on its application for the removal of very persistent pollutants. On the other hand, these processes have demonstrated a high efficiency for disinfection water. Thus, this Special Issue seeks to publish interesting research works that demonstrate high-efficiency AOPs for the treatment of water and wastewater. Authors with expertise in these topics are invited to submit their original manuscripts and review articles to Processes.

Dr. Maria Jose Martin de Vidales
Dr. Sara Mateo
Dr. José Fernando Pérez
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. Processes 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 2400 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 (AOPs)
  • disinfection
  • wastewater treatment
  • photocatalytic processes
  • electrochemical processes
  • ozonation
  • Fenton
  • photoFenton

Published Papers (3 papers)

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Research

15 pages, 5994 KiB  
Article
Photodegradation and Mineralization of Phenol Using TiO2Coated γ-Al2O3: Effect of Thermic Treatment
by Claudia Martinez-Gómez, Israel Rangel-Vazquez, Ramon Zarraga, Gloria del Ángel, Beatriz Ruíz-Camacho, Francisco Tzompantzi, Esmeralda Vidal-Robles and Alejandro Perez-Larios
Processes 2022, 10(6), 1186; https://doi.org/10.3390/pr10061186 - 14 Jun 2022
Cited by 4 | Viewed by 1889
Abstract
It is well-known that γ-Al2O3 possesses large, specific areas and high thermal, chemical, and mechanical resistance. Due to this, it is the most-used support for catalysts, in this case TiO2, as it enables it to achieve better dispersion [...] Read more.
It is well-known that γ-Al2O3 possesses large, specific areas and high thermal, chemical, and mechanical resistance. Due to this, it is the most-used support for catalysts, in this case TiO2, as it enables it to achieve better dispersion and improves the activity in catalytic photodegradation reactions. In a previous work, it was observed that the optimal content of TiO2 in γ-Al2O3 was around 15% since the degradation of phenol results were maximized and a synergistic effect was generated by the interaction of both oxides. In addition, an increase in acidity crystal size and the generation of localized, oxygen-vacant, electronic states in the forbidden band of γ-Al2O3, were observed. This study focuses on the effect of the calcination temperature on a γ-Al2O3-TiO2 catalyst (15% w/w of TiO2) and its impact on photocatalytic activity. The catalysts prepared here were characterized by X-ray diffraction, N2 adsorption–desorption, FTIR-pyridine adsorption, MAS-NMR, HRTEM-FFT, UV-vis, and fluorescence spectroscopy. Full article
(This article belongs to the Special Issue Wastewater Treatment by Advanced Oxidation Processes)
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30 pages, 8941 KiB  
Article
Molybdenum Modified Sol–Gel Synthesized TiO2 for the Photocatalytic Degradation of Carbamazepine under UV Irradiation
by Chukwuka Bethel Anucha, Emin Bacaksiz, Vassilis N. Stathopoulos, Pavlos K. Pandis, Christos Argirusis, Constantina-Dia Andreouli, Zoi Tatoudi and Ilknur Altin
Processes 2022, 10(6), 1113; https://doi.org/10.3390/pr10061113 - 2 Jun 2022
Cited by 4 | Viewed by 1735
Abstract
Pharmaceutical CEC compounds are a potential threat to man, animals, and the environment. In this study, a sol–gel-derived TiO2 (SynTiO2) was produced and subsequently sonochemically doped with a 1.5 wt% Mo to obtain the final product (Mo (1.5 wt%)/SynTiO2 [...] Read more.
Pharmaceutical CEC compounds are a potential threat to man, animals, and the environment. In this study, a sol–gel-derived TiO2 (SynTiO2) was produced and subsequently sonochemically doped with a 1.5 wt% Mo to obtain the final product (Mo (1.5 wt%)/SynTiO2). The as-prepared materials were characterized for phase structure, surface, and optical properties by XRD, TEM, N2 adsorption–desorption BET isotherm at 77 K, and PSD by BJH applications, FTIR, XPS, and UV-Vis measurements in DRS mode. Estimated average crystallite size, particle size, surface area, pore-volume, pore size, and energy bandgap were 16.10 nm, 24.55 nm, 43.30 m2/g, 0.07 cm3/g, 6.23 nm, and 3.05 eV, respectively, for Mo/SynTiO2. The same structural parameters were also estimated for the unmodified SynTiO2 with respective values of 14.24 nm, 16.02 nm, 133.87 m2/g, 0.08 cm3/g, 2.32 nm, and 3.3 eV. Structurally improved (Mo (1.5 wt%)/SynTiO2) achieved ≈100% carbamazepine (CBZ) degradation after 240 min UV irradiation under natural (unmodified) pH conditions. Effects of initial pH, catalyst dosage, initial pollutant concentration, chemical scavengers, contaminant ions, hydrogen peroxide (H2O2), and humic acid (HA) were also investigated and discussed. The chemical scavenger test was used to propose involved photocatalytic degradation process mechanism of CBZ. Full article
(This article belongs to the Special Issue Wastewater Treatment by Advanced Oxidation Processes)
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31 pages, 9755 KiB  
Article
Photocatalytic Degradation of Diazo Dye over Suspended and Immobilized TiO2 Catalyst in Swirl Flow Reactor: Kinetic Modeling
by Waleed Jadaa, Anand Prakash and Ajay K. Ray
Processes 2021, 9(10), 1741; https://doi.org/10.3390/pr9101741 - 28 Sep 2021
Cited by 12 | Viewed by 2657
Abstract
The degradation kinetics of Direct Blue 15 (DB15), a diazo dye, were studied over a suspended and immobilized TiO2 catalyst. For all experiments, the kinetics experiments were performed in a swirl flow photoreactor under the influence of UV light. The effect of [...] Read more.
The degradation kinetics of Direct Blue 15 (DB15), a diazo dye, were studied over a suspended and immobilized TiO2 catalyst. For all experiments, the kinetics experiments were performed in a swirl flow photoreactor under the influence of UV light. The effect of different parameters: dye concentration, catalyst loading, and light intensity, on the DB15 kinetics was investigated. The kinetic rates were assessed using apparent (ka) approach, a single value of reaction rate (kr) and adsorption constant (K), and approach of kr as of variable. The DB15 mineralization was discussed as well. Using a dip-coating device, the P25 catalyst was deposited on a Pyrex glass. The thin film surface characterization was examined. The coated catalyst was evaluated by checking the effect of two variables: initial dye concentration and light intensity on the DB15 kinetics. In terms of the ka approach, the results demonstrated that DB15 degradation is described by the pseudo first-order kinetics model. The Langmuir-Hinshelwood (L-H) model was fitted well with the experimental data for the number of process variables. L-H constant kr was determined as a function of three parameters: initial dye concentration, catalyst loading, and light intensity. The ka values were evaluated and compared with experimental results. In terms of three variables, ka can be expressed as ka=0.15 [C]o−0.69 [W]0.73 I0.91 1+0.17 [C]o  while the empirical model results in the following expression, ka=0.77 [C]o−1.65 [W]0.73 Io0.89. It was observed that 83.64% mineralization was achieved after a period of 16 hrs. In terms of immobilized catalyst, the DB15 degradation kinetics was described by a pseudo first-order model for different dye concentrations. Meanwhile, a power-law model described the impact of light intensity on dye kinetics. In addition, the coated catalyst was successfully reusable with high efficiency for up to four cycles. Full article
(This article belongs to the Special Issue Wastewater Treatment by Advanced Oxidation Processes)
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