Synergetic photoelectrocatalytic reactors for environmental remediation: A review

Meng, Xiangchao; Zhang, Zisheng; Li, Xingang

doi:10.1016/j.jphotochemrev.2015.07.003

Cited by 138 publications

(43 citation statements)

References 177 publications

(230 reference statements)

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“…The application of external potential or current significantly improves the photocatalytic degradation efficiency, due to the decrease in recombination rate and formation of radicals simultaneously in both (photocatalytic and electrochemical) processes. In the case of photoanodes, the photo-generated electrons are transferred to the external circuit and they are concentrated in the cathode, while photo-generated holes are accumulated in the anode, which guarantees a significant decrease in e − /h + recombination rate [50]. Reactive radicals and highly oxidant species formed both on the cathode and anode can react with pollutants present in wastewater.…”

Section: Speciesmentioning

confidence: 99%

“…The photocatalytic material (semiconductor) should be immobilized at the electrode surface in order to avoid the complicated separation of the photocatalyst applied in the slurry system. In the proper reactor arrangement, the immobilization of the photocatalyst does not decrease its photocatalytic activity [50].…”

Section: Photoelectrode Typementioning

confidence: 99%

“…In the case the photoelectrochemical reactor, the counter electrode is a cathode or anode, depending on the working electrode-photoanode or photocathode. The counter electrode plays an important role in the inhibition of recombination between e − and h + by using the external constant potential or current [21,50]. Other factors, like scavengers, should also be considered along with the external bias, since they can reduce recombinations, due to bulk and surface recombinations.…”

Section: Counter Electrodementioning

confidence: 99%

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Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Kuśmierek

2020

Catalysts

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Industrial sources of environmental pollution generate huge amounts of industrial wastewater containing various recalcitrant organic and inorganic pollutants that are hazardous to the environment. On the other hand, industrial wastewater can be regarded as a prospective source of fresh water, energy, and valuable raw materials. Conventional sewage treatment systems are often not efficient enough for the complete degradation of pollutants and they are characterized by high energy consumption. Moreover, the chemical energy that is stored in the wastewater is wasted. A solution to these problems is an application of photoelectrocatalytic treatment methods, especially when they are coupled with energy generation. The paper presents a general overview of the semiconductor materials applied as photoelectrodes in the treatment of various pollutants. The fundamentals of photoelectrocatalytic reactions and the mechanism of pollutants treatment as well as parameters affecting the treatment process are presented. Examples of different semiconductor photoelectrodes that are applied in treatment processes are described in order to present the strengths and weaknesses of the photoelectrocatalytic treatment of industrial wastewater. This overview is an addition to the existing knowledge with a particular focus on the main experimental conditions employed in the photoelectrocatalytic degradation of various pollutants with the application of semiconductor photoelectrodes.

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Section: Speciesmentioning

confidence: 99%

Section: Photoelectrode Typementioning

confidence: 99%

Section: Counter Electrodementioning

confidence: 99%

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Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Kuśmierek

2020

Catalysts

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“…Over the last four decades, photocatalysis has been extensively studied and developed . This advanced technique can potentially be applied in various areas such as water splitting to evolve hydrogen and oxygen, decomposition of pollutants in waste water and polluted air, disinfection, recently developed CO 2 reduction, and N 2 fixation . Aiming to sufficiently use sunlight as the energy source for a photocatalytic process, it is significant to develop a material with high both ultraviolet and visible light‐driven photoactivity.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Meng

Zhang

2018

AIChE Journal

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A photoreactor packed with glass beads coated by palladium nanoparticles-modified BiVO 4 was tested and analyzed in phenol degradation under UV-Visible light. The photocatalytic activity of Pd-BiVO 4 under visible light is higher than TiO 2 under UV light, as we previously reported. In this work, we try to use the Pd-BiVO 4 in a large scale by coating the glass beads with it, a potentially industrial-scale use. For comparison, a flat-plate reactor and a slurry reactor were also examined. The photocatalytic activity of Pd-BiVO 4 in phenol degradation was found to be higher than that of TiO 2 in all systems (slurry, flat-plate, and packed beads reactor [PBR]). Furthermore, PBR exhibited higher energy efficiency compared to the flat-plate reactor in phenol oxidation. The superior performance of this reactor is due primarily to the highly exposed catalyst surface area, high mass transfer coefficient, and effective delivery of both photons and reactants to the catalyst surfaces.

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“…Therefore, an effective, non-toxic and low cost process is required for this goal, that advanced oxidation processes (AOPs) based on production of hydroxyl radicals (•OH), including Fenton, sonolysis, heterogeneous and homogeneous photocatalysis, ozonation, etc. are effective method for degrade pollutants [11][12][13][14][15][16]. In odder word, hybrid systems including of two or more individual AOPs have higher efficiency for degradation pollutants [17].…”

Section: Introductionmentioning

confidence: 99%

Sonophotocatalytic degradation of trypan blue and vesuvine dyes in the presence of blue light active photocatalyst of Ag3PO4/Bi2S3-HKUST-1-MOF: Central composite optimization and synergistic effect study

Mosleh

Rahimi

Ghaedi

et al. 2016

Ultrasonics Sonochemistry

142

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An efficient simultaneous sonophotocatalytic degradation of trypan blue (TB) and vesuvine (VS) using Ag3PO4/Bi2S3-HKUST-1-MOF as a novel visible light active photocatalyst was carried out successfully in a continuous flow-loop reactor equipped to blue LED light. Ag3PO4/Bi2S3-HKUST-1-MOF with activation ability under blue light illumination was synthesized and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), photoluminescence (PL) and diffuse reflectance spectra (DRS). The effect of operational parameters such as the initial TB and VS concentration (5-45mg/L), flow rate (30-110mL/min), irradiation and sonication time (10-30min), pH (3-11) and photocatalyst dosage (0.15-0.35g/L) has been investigated and optimized using central composite design (CCD) combined with desirability function (DF). Maximum sonophotodegradation percentage (98.44% and 99.36% for TB and VS, respectively) was found at optimum condition set as: 25mg/L of each dye, 70mL/min of solution flow rate, 25min of irradiation and sonication time, pH 6 and 0.25g/L of photocatalyst dosage. At optimum conditions, synergistic index value was obtained 2.53 that indicated the hybrid systems including ultrasound irradiation and photocatalysis have higher efficiency compared with sum of the individual processes.

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Synergetic photoelectrocatalytic reactors for environmental remediation: A review

Cited by 138 publications

References 177 publications

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads

Sonophotocatalytic degradation of trypan blue and vesuvine dyes in the presence of blue light active photocatalyst of Ag3PO4/Bi2S3-HKUST-1-MOF: Central composite optimization and synergistic effect study

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Synergetic photoelectrocatalytic reactors for environmental remediation: A review

Cited by 138 publications

References 177 publications

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Semiconductor Electrode Materials Applied in Photoelectrocatalytic Wastewater Treatment—an Overview

Experimental analysis of a photoreactor packed with Pd‐BiVO4‐Coated glass beads

Sonophotocatalytic degradation of trypan blue and vesuvine dyes in the presence of blue light active photocatalyst of Ag3PO4/Bi2S3-HKUST-1-MOF: Central composite optimization and synergistic effect study

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Experimental analysis of a photoreactor packed with Pd‐BiVO₄‐Coated glass beads