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Photo(electro)catalytic Reactions Combined with Ozone Oxidation Technique

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

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 13883

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Special Issue Editors

Prof. Dr. Chung-Shin Yuan

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Guest Editor

Institute of Environmental Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
Interests: advanced oxidation technologies; photothermocatalytic oxidation and reduction; air pollutants sampling and analysis; marine aerosols; atmospheric speciated mercury
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Chung-Hsuang Hung

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Guest Editor

Department of Safety, Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 82445, Taiwan
Interests: photocatalysis; advanced oxidation processes; pollution control technology; clean technology; pollutant transport phenomena
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Photo(electro)catalytic oxidation techniques, including photocatalytic oxidation (PCO) and photoelectrocatalytic oxidation (PECO), have been widely applied for the treatment of dye, medicine, and organic compounds (OCs) in wastewater and waste gases. Photo(electro)catalytic oxidation is a promising technique that uses semi-conductors as catalysts to convert light/electrical energy into chemical energy. Another potential technique is ozone oxidation, which can be used for decomposing OCs due to its strong oxidation capability using ozone and other oxidants as reactants. However, the removal efficiency of OCs solely exerted by ozone is low. Thus, combining ozone oxidation with other advanced oxidation techniques (AOTs), such as photo(electro)catalysis, is an option to effectively enhance the decomposition of various pollutants. Although both ozone and photo(electro)catalytic oxidation have been used to decompose pollutants separately, developing an efficient AOT by combining photo(electro)catalytic and ozonolytic oxidation with potential applications is urgently demanded.

The Special Issue aims to cover the most recent progress and the advances in the field of photo(electro)catalytic techniques combined with ozone oxidation. This includes, but is not limited to, the preparation and characterization of nano-sized photo(electro)catalysts, the degradation of OCs and other pollutants, and the development of ozone-assisted advanced photo(electro)catalytic oxidation techniques for wastewater and waste gas treatment. Any innovative techniques regarding photo(electro)catalytic reactions with/without ozone and other oxidants will be welcomed for publication in this Special Issue.

Prof. Dr. Chung-Shin Yuan
Prof. Dr. Chung-Hsuang Hung
Guest Editors

Manuscript Submission Information

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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

innovative photo(electro)catalytic and ozonolytic techniques
nano-sized photo(electro)catalysts
mobilized and immobilized photo(electro)catalysts
ozonolysis and advanced oxidation techniques
photo(electro)catalytic reactions with/without oxidants
degradation of organic compounds and other pollutants
wastewater and waste gas treatment

Published Papers (5 papers)

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Research

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18 pages, 5270 KiB

Open AccessArticle

Photodegradation of Carbol Fuchsin Dye Using an Fe_2−xCu_xZr_2−xW_xO₇ Photocatalyst under Visible-Light Irradiation

by Rund Abu-Zurayk, Aya Khalaf, Hussien A. Abbas, Rabab A. Nasr, Tarek S. Jamil and Abeer Al Bawab

Catalysts 2021, 11(12), 1473; https://doi.org/10.3390/catal11121473 - 1 Dec 2021

Cited by 5 | Viewed by 2270

Abstract

Fe_2−xCu_xZr_2−xW_xO₇ (x: 0, 0.05, 0.015) nanoparticles were synthesized following the Pechini method and characterized via X-ray diffraction (XRD), transmission electron microscopy (TEM), and diffuse reflectance spectroscopy (DRS) measurements to be used as photocatalysts in colored water remediation. All of the prepared materials were crystallized in a cubic fluorite phase as the major phase. The band gap was reduced upon doping with W⁶⁺ and Cu²⁺ from 1.96 eV to 1.47 eV for Fe_1.85Cu₀.₁₅Zr_1.85W_0.15O₇. Carbol fuchsin (CF) dye was used to determine the photocatalytic degradation efficiency of the prepared catalysts. Degradation efficiency was directly proportional to the dopant’s concentration. Complete removal of 20 mg/L CF was achieved under optimal conditions (pH 9, and catalyst loading of 1.5 g/L) using Fe_1.85Cu_0.15Zr_1.85W_0.15O₇. The degradation rate followed pseudo-first-order kinetics. The reusability for photocatalysts was tested five times, decreasing its efficiency by 4% after the fifth cycle, which indicates that the prepared Fe_1.85Cu_0.15Zr_1.85W_0.15O₇ photocatalyst is a promising novel photocatalyst due to its superior efficiency in dye photodegradation. Full article

(This article belongs to the Special Issue Photo(electro)catalytic Reactions Combined with Ozone Oxidation Technique)

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10 pages, 2956 KiB

Open AccessFeature PaperArticle

Development of Visible-Light-Driven Rh–TiO₂–CeO₂ Hybrid Photocatalysts for Hydrogen Production

by Jong-Wook Hong

Catalysts 2021, 11(7), 848; https://doi.org/10.3390/catal11070848 - 15 Jul 2021

Cited by 7 | Viewed by 2455

Abstract

Visible-light-driven hydrogen production through photocatalysis has attracted enormous interest owing to its great potential to address energy and environmental issues. However, photocatalysis possesses several limitations to overcome for practical applications, such as low light absorption efficiency, rapid charge recombination, and poor stability of photocatalysts. Here, the preparation of efficient noble metal–semiconductor hybrid photocatalysts for photocatalytic hydrogen production is presented. The prepared ternary Rh–TiO₂–CeO₂ hybrid photocatalysts exhibited excellent photocatalytic performance toward the hydrogen production reaction compared with their counterparts, ascribed to the synergistic combination of Rh, TiO₂, and CeO₂. Full article

(This article belongs to the Special Issue Photo(electro)catalytic Reactions Combined with Ozone Oxidation Technique)

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14 pages, 1424 KiB

Open AccessFeature PaperEditor’s ChoiceArticle

Photocatalytic Degradation of Sulfolane Using a LED-Based Photocatalytic Treatment System

by Sripriya Dharwadkar, Linlong Yu and Gopal Achari

Catalysts 2021, 11(5), 624; https://doi.org/10.3390/catal11050624 - 12 May 2021

Cited by 12 | Viewed by 3286

Abstract

Sulfolane is an emerging industrial pollutant detected in the environments near many oil and gas plants in North America. So far, numerous advanced oxidation processes have been investigated to treat sulfolane in aqueous media. However, there is only a few papers that discuss the degradation of sulfolane using photocatalysis. In this study, photocatalytic degradation of sulfolane using titanium dioxide (TiO₂) and reduced graphene oxide TiO₂ composite (RGO-TiO₂) in a light-emitting diode (LED) photoreactor was investigated. The impact of different waters (ultrapure water, tap water, and groundwater) and type of irradiation (UVA-LED and mercury lamp) on photocatalytic degradation of sulfolane were also studied. In addition, a reusability test was conducted for the photocatalyst to examine the degradation of sulfolane in three consecutive cycles with new batches of sulfolane-contaminated water. The results show that LED-based photocatalysis was effective in degrading sulfolane in waters even after three photocatalytic cycles. UVA-LEDs displayed more efficient use of photon energy when compared with the mercury lamps as they have a narrow emission spectrum coinciding with the absorption of TiO₂. The combination of UVA-LED and TiO₂ yielded better performance than UVA-LED and RGO-TiO₂ for the degradation of sulfolane. Much lower sulfolane degradation rates were observed in tap water and groundwater than ultrapure water. Full article

(This article belongs to the Special Issue Photo(electro)catalytic Reactions Combined with Ozone Oxidation Technique)

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16 pages, 5423 KiB

Open AccessArticle

Green Synthesized Palladium Coated Titanium Nanotube Arrays for Simultaneous Azo-Dye Degradation and Hydrogen Production

by Yuan-Chung Lin, Chia-Hung Chen, Kang-Shin Chen, Yen-Ping Peng, Yung-Chang Lin, Shih-Wei Huang, Chien-Er Huang, Hsiao-Wu Lai and Hsing-Wang Li

Catalysts 2020, 10(11), 1330; https://doi.org/10.3390/catal10111330 - 16 Nov 2020

Cited by 8 | Viewed by 2212

Abstract

In this study, electrodes of titanium dioxide nanotube arrays (TNAs) were successfully synthesized by applying the anodic oxidation etching method, as well as the use of green synthetic technology to add reducing agents of tea or coffee to reduce metal palladium from palladium chloride. Synthesis of palladium modified TNAs (Pd/TNAs) was conducted by the microwave hydrothermal method after the metal palladium was reduced. In order to identify the surface structure, light absorption and elemental composition, TNAs and Pd/TNAs were characterized by X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Furthermore, to test the photocurrent density, electron resistance, and hydroxyl radicals by I-t plot, electrochemistry impedance spectroscopy (EIS), and electron paramagnetic resonance (EPR) were investigated. The photocurrent (4.0 mA/cm²) of Pd/TNAs-C (using coffee as the reducing agent) at +1.0 V (vs. Ag/AgCl) was higher than that of the pure TNAs (1.5 mA/cm²), illustrating that Pd/TNAs-C can effectively separate photogenerated electrons and holes. Pd/TNAs is a favorable material as a photoanode for the photoelectrochemical (PEC) removal of organic pollutants in wastewater. Full article

(This article belongs to the Special Issue Photo(electro)catalytic Reactions Combined with Ozone Oxidation Technique)

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Review

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36 pages, 8991 KiB

Open AccessReview

A Review of Electrical Assisted Photocatalytic Technologies for the Treatment of Multi-Phase Pollutants

by Chung-Shin Yuan, Iau-Ren Ie, Ji-Ren Zheng, Chung-Hsuan Hung, Zu-Bei Lin and Ching-Hsun Shih

Catalysts 2021, 11(11), 1332; https://doi.org/10.3390/catal11111332 - 31 Oct 2021

Cited by 10 | Viewed by 2713

Abstract

This article reviews the fundamental theories and reaction mechanisms of photocatalytic technologies with the assistance of electrical field for degrading multi-phase pollutants. Photo(electro)catalysis including photocatalytic oxidation (PCO) and photoelectrocatalytic oxidation (PECO) have been a potential technologies applied for the treatment of organic and inorganic compounds in the wastewaters and waste gases, which has been treated as a promising technique by using semiconductors as photo(electro)catalysts to convert light or electrical energy to chemical energy. Combining photocatalytic processes with electrical field is an option to effectively decompose organic and inorganic pollutants. Although photocatalytic oxidation techniques have been used to decompose multi-phase pollutants, developing efficient advanced oxidation technologies (AOTs) by combining photocatalysis with electrical potential is urgently demanded in the future. This article reviews the most recent progress and the advances in the field of photocatalytic technologies combined with external electrical field, including the characterization of nano-sized photo(electro)catalysts, the degradation of multi-phase pollutants, and the development of electrical assisted photocatalytic technologies for the potential application on the treatment of organic and inorganic compounds in the wastewaters and waste gases. Innovative oxidation techniques regarding photo(electro)catalytic reactions with and without oxidants are included in this review article. Full article

(This article belongs to the Special Issue Photo(electro)catalytic Reactions Combined with Ozone Oxidation Technique)

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