TY - JOUR
T1 - Low-temperature microwave-assisted synthesis of Bi2WO6/Bi2S3 heterojunction for photocatalytic reduction of Cr(VI) in industrial wastewater
AU - Liu, Yuanping
AU - Shi, Liyan
AU - Srinivasakannan, Chandrasekar
AU - Qu, Wenwen
AU - Lu, Jialin
AU - Liu, Qi
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/8/30
Y1 - 2024/8/30
N2 - Cr(VI) pollution has become a worldwide environmental issue due to its toxicity and non-biodegradability in wastewater. Herein, a Bi2S3/Bi2WO6 (BWS) Z-scheme heterojunction was successfully fabricated via a low-temperature in situ sulfurization process assisted by microwave irradiation and applied to the photocatalytic reduction of Cr(VI) in industrial electroplating wastewater. The effects of Bi2S3 loading, catalyst dosage, light source, and synthesis method on the catalytic performance of the heterojunctions were investigated. Remarkably, the optimized BWS-6 heterojunction achieved 100% Cr(VI) removal within 50 min under LED light irradiation and 30 min under sunlight irradiation, which greatly exceeded the pure Bi2S3 and Bi2WO6. In addition, BWS-6 exhibited high photostability, and it still sustained preferable photocatalytic Cr(VI) reduction activity under sunlight irradiation when the experiment was scaled up 20 times. The high photocatalytic activity of BWS photocatalysts can be ascribed to enlarged surface area, active centers, and intimate interfacial contact of Z-scheme heterojunction, which greatly improve visible-light harvesting, surface adsorption, and the transport efficiency of interfacial charge. Experimental and theoretical calculation results further evidenced a built-in electric field forming at the interface of the Z-scheme heterojunction and unveiled a possible photocatalytic reduction pathway. This work provides valuable information for large-scale applications in the removal of Cr(VI) from industrial wastewater by Z-scheme heterojunctions.
AB - Cr(VI) pollution has become a worldwide environmental issue due to its toxicity and non-biodegradability in wastewater. Herein, a Bi2S3/Bi2WO6 (BWS) Z-scheme heterojunction was successfully fabricated via a low-temperature in situ sulfurization process assisted by microwave irradiation and applied to the photocatalytic reduction of Cr(VI) in industrial electroplating wastewater. The effects of Bi2S3 loading, catalyst dosage, light source, and synthesis method on the catalytic performance of the heterojunctions were investigated. Remarkably, the optimized BWS-6 heterojunction achieved 100% Cr(VI) removal within 50 min under LED light irradiation and 30 min under sunlight irradiation, which greatly exceeded the pure Bi2S3 and Bi2WO6. In addition, BWS-6 exhibited high photostability, and it still sustained preferable photocatalytic Cr(VI) reduction activity under sunlight irradiation when the experiment was scaled up 20 times. The high photocatalytic activity of BWS photocatalysts can be ascribed to enlarged surface area, active centers, and intimate interfacial contact of Z-scheme heterojunction, which greatly improve visible-light harvesting, surface adsorption, and the transport efficiency of interfacial charge. Experimental and theoretical calculation results further evidenced a built-in electric field forming at the interface of the Z-scheme heterojunction and unveiled a possible photocatalytic reduction pathway. This work provides valuable information for large-scale applications in the removal of Cr(VI) from industrial wastewater by Z-scheme heterojunctions.
KW - BiS/BiWO Z-scheme heterojunction
KW - Industrial wastewater
KW - Low temperature
KW - Microwave-assisted synthesis
KW - Photocatalytic reduction of Cr(VI)
UR - http://www.scopus.com/inward/record.url?scp=85193798559&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2024.174842
DO - 10.1016/j.jallcom.2024.174842
M3 - Article
AN - SCOPUS:85193798559
SN - 0925-8388
VL - 997
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 174842
ER -