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Tuning of BixOyCl formation with sonication time during ultrasound-hydrothermal preparation
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.jiec.2020.01.014
Zeqing Long , Guangming Zhang , Ting Wei , Lijun Niu , Jia Zhu , Jinwei Li

Abstract Developing novel and visible-light drive photocatalysts is a hot topic, and bismuth oxychloride is one of the 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 can control the morphology, structure, stoichiometry and photoelectric performance of bismuth oxychloride. The possible mechanism for the formation of BixOyCl photocatalysts involved the ultrasonic destruction of chemical bonds and increase of oxygen vacancy concentration, and the influence of ultrasonic on the pH during preparation. The sample of ultrasonic 30 min (U-30) showed the best photocatalytic activity due to the suitable morphology, structure, photoelectric performance, the formation of the heterostructure, 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 photogenerated electron-hole recombination rate decreased gradually with the ultrasonic time. Further, the possible mechanism of photocatalytic process was investigated. This research provides a green, economical and simple method to modify bismuth oxychloride.

中文翻译:

在超声-水热制备过程中用超声时间调节 BixOyCl 的形成

摘要 开发新型可见光驱动光催化剂是一个热门话题,而氯氧化铋是一种流行的光催化剂。本文采用不同超声时间的超声-水热法合成了一系列三氯氧化铋。通过简单地改变超声时间,我们可以控制三氯氧化铋的形貌、结构、化学计量和光电性能。BixOyCl 光催化剂形成的可能机制涉及化学键的超声破坏和氧空位浓度的增加,以及制备过程中超声对 pH 值的影响。由于合适的形貌、结构、光电性能、异质结构的形成,超声 30 min (U-30) 的样品表现出最佳的光催化活性,以及氧空位的存在。对于去除罗丹明 B (/环丙沙星),U-30 的反应速率常数为 U-的 10.4 (/3.6)、4.9 (/1.6)、6.9 (/4.8) 和 9.3 (/2.3) 倍0、U-10、U-20 和 U-40。光致发光光谱表明,随着超声时间的延长,光生电子-空穴复合率逐渐降低。此外,研究了光催化过程的可能机制。本研究为氯氧化铋的改性提供了一种绿色、经济、简便的方法。光致发光光谱表明,随着超声时间的延长,光生电子-空穴复合率逐渐降低。此外,研究了光催化过程的可能机制。本研究为氯氧化铋的改性提供了一种绿色、经济、简便的方法。光致发光光谱表明,随着超声时间的延长,光生电子-空穴复合率逐渐降低。此外,研究了光催化过程的可能机制。本研究为氯氧化铋的改性提供了一种绿色、经济、简便的方法。
更新日期:2020-04-01
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