Visible-light-driven photoelectrocatalytic degradation of diclofenac by N, S–TiO2/TiO2 NTs photoelectrode: performance and mechanism study

Cheng, Xiuwen; Wang, Pu; Liu, Huiling

doi:10.1016/j.jece.2015.06.015

Cited by 22 publications

(7 citation statements)

References 36 publications

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“…The photocatalyst particles are not consumed during the illumination, and hence they can be reused for several cycles until the active surface is blocked by the accumulation of organic matter [22]. The active sites can be maintained by prior biological treatment, which also provides a clearer medium and reduces the competition on the ROS [23].…”

Section: Introductionmentioning

confidence: 99%

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

et al. 2021

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Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research–practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.

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Section: Introductionmentioning

confidence: 99%

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

et al. 2021

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“…This configuration allows for more efficient separation of the charges (e/h −+ ) formed in the process, thereby increasing the lifetime of electron–hole pairs (Hou et al, 2020a , 2020b ; Li et al, 2018 ; Su et al, 2016 ). Photoelectrocatalysis has been shown to efficiently degrade chlorfenvinphos (Fernández-Domene et al, 2019 ; Roselló-Márquez et al, 2021 ), diclofenac (Cheng et al, 2015 ; Liu et al, 2017b ), and methylene blue (Rosa et al, 2020 ; Wu et al, 2019 ). Advances in electrochemistry and materials science (new materials active in visible light) have led to increased interest in using photoelectrochemical processes to eliminate CECs.…”

Section: Visible Light–driven Advanced Oxidation Processesmentioning

confidence: 99%

“…The idea behind photoelectrocatalytic processes is to generate highly reactive oxidative radicals. It can be thought that, mainly, hydroxyl radicals ( • OH) and, to a lesser extent, • O 2 − , H 2 O 2 and h + radicals are responsible for the decomposition mechanism in visible light–driven photoelectrocatalysis, as shown in Cheng et al ( 2015 ).…”

Section: Visible Light–driven Advanced Oxidation Processesmentioning

confidence: 99%

Visible Light–Driven Advanced Oxidation Processes to Remove Emerging Contaminants from Water and Wastewater: a Review

Zawadzki

2022

Water Air Soil Pollut

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The scientific data review shows that advanced oxidation processes based on the hydroxyl or sulfate radicals are of great interest among the currently conventional water and wastewater treatment methods. Different advanced treatment processes such as photocatalysis, Fenton’s reagent, ozonation, and persulfate-based processes were investigated to degrade contaminants of emerging concern (CECs) such as pesticides, personal care products, pharmaceuticals, disinfectants, dyes, and estrogenic substances. This article presents a general overview of visible light–driven advanced oxidation processes for the removal of chlorfenvinphos (organophosphorus insecticide), methylene blue (azo dye), and diclofenac (non-steroidal anti-inflammatory drug). The following visible light–driven treatment methods were reviewed: photocatalysis, sulfate radical oxidation, and photoelectrocatalysis. Visible light, among other sources of energy, is a renewable energy source and an excellent substitute for ultraviolet radiation used in advanced oxidation processes. It creates a high application potential for solar-assisted advanced oxidation processes in water and wastewater technology. Despite numerous publications of advanced oxidation processes (AOPs), more extensive research is needed to investigate the mechanisms of contaminant degradation in the presence of visible light. Therefore, this paper provides an important source of information on the degradation mechanism of emerging contaminants. An important aspect in the work is the analysis of process parameters affecting the degradation process. The initial concentration of CECs, pH, reaction time, and catalyst dosage are discussed and analyzed. Based on a comprehensive survey of previous studies, opportunities for applications of AOPs are presented, highlighting the need for further efforts to address dominant barriers to knowledge acquisition.

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“…Photocatalysis is well-reported in literature for organic pollutants degradation in water environment, under visible and UV light irradiation. Degradation of DCF has also been studied in several reports using the commercial Pd/Al 2 O 3 [22], pyrite nanoparticles synthesized by sonication [23], photoelectrocatalysis under visible light irradiation [24], ozone and peroxone processes [25], heterogeneous photocatalysts [26,27], water radiolysis [28], gamma ray irradiation [29], electron beam irradiation [30], and Co 3 O 4 -CeO 2 as a heterogeneous catalyst for activation of persulfate [31].…”

Section: Introductionmentioning

confidence: 99%

Application of Photocatalytic Falling Film Reactor to Elucidate the Degradation Pathways of Pharmaceutical Diclofenac and Ibuprofen in Aqueous Solutions

et al. 2019

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Diclofenac (DCF) and ibuprofen (IBP) are common pharmaceutical residues that have been detected in the aquatic system. Their presence in the aquatic environment has become an emerging contaminant problem, which has implications for public health. The degradation pathway and identification of transformation products of pharmaceutical residues are crucial to elucidate the environmental fate of photocatalytic decomposition of these pollutants in aqueous media. The degradation process might lead to creation of other possible emerging contaminates. In this study, the degradation of DCF and IBP in aqueous solutions was investigated. To this end, coated TiO2 on a Pilkington Active glass was used as a photocatalyst under UVA illumination, in a planar falling film reactor. Pilkington ActivTM glass was used as a photocatalyst and a falling liquid film generator. Degradation kinetics of both pharmaceuticals followed a pseudo-first-order model. The transformation products of both diclofenac and ibuprofen during the degradation process were detected and identified with gas chromatography–mass spectrometry (GC–MS) and ion chromatography. The results showed that the mineralization rate of both pharmaceuticals through photocatalysis was very low. Low chain carboxylic acids, such as formic, acetic, oxalic, malonic, and succinic acids were the main by-products. A pathway of DCF and IBP degradation was proposed.

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Visible-light-driven photoelectrocatalytic degradation of diclofenac by N, S–TiO2/TiO2 NTs photoelectrode: performance and mechanism study

Cited by 22 publications

References 36 publications

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

Visible Light–Driven Advanced Oxidation Processes to Remove Emerging Contaminants from Water and Wastewater: a Review

Application of Photocatalytic Falling Film Reactor to Elucidate the Degradation Pathways of Pharmaceutical Diclofenac and Ibuprofen in Aqueous Solutions

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