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Tuning of BixOyCl formation with sonication time during ultrasound-hydrothermal preparation
Zeqing Long,Guangming Zhang,Ting Wei,Lijun Niu,Jia Zhu,Jinwei Li 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
Developing novel and visible-light drive photocatalysts is a hot topic, and bismuth oxychloride is one ofthe popular photocatalysts. In this paper, a series of bismuth oxychloride were synthesized by ultrasonic-hydrothermal method with different ultrasonic time. By simply changing the ultrasonic time, we cancontrol the morphology, structure, stoichiometry and photoelectric performance of bismuth oxychloride. The possible mechanism for the formation of BixOyCl photocatalysts involved the ultrasonic destructionof chemical bonds and increase of oxygen vacancy concentration, and the influence of ultrasonic on thepH during preparation. The sample of ultrasonic 30 min (U-30) showed the best photocatalytic activitydue to the suitable morphology, structure, photoelectric performance, the formation of theheterostructure, and the presence of oxygen vacancies. For the removal of Rhodamine B (/Ciprofloxacin),the reaction rate constant for U-30 was 10.4 (/3.6), 4.9 (/1.6), 6.9 (/4.8), and 9.3 (/2.3) times that of the U-0,U-10, U-20, and U-40, respectively. Photoluminescence spectra showed that the photogeneratedelectron-hole recombination rate decreased gradually with the ultrasonic time. Further, the possiblemechanism of photocatalytic process was investigated. This research provides a green, economical andsimple method to modify bismuth oxychloride.
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