摘要
调整禁带宽度和抑制光生电子-空穴对复合是提高Bi_(2)O_(3)半导体光催化性能的重要途径。首先采用溶液合成和热处理法成功制备了SiO_(2)@Bi_(2)O_(3)核壳微球,研究了投料比、热处理温度等因素来调控核壳组成和包覆效果。为提高光催化活性,采用Cl掺杂改变SiO_(2)@Bi_(2)O_(3)核壳微球壳层的结构、形貌与组成,通过XRD、SEM、TEM等方法确定了微球壳层为BiOCl-Bi_(24)O_(31)Cl_(10)复合物。调整摩尔比、氨水和NaCl用量等参数,优化SiO_(2)@BiOCl-Bi_(24)O_(31)Cl_(10)核壳微球的均匀包覆效果,大幅提高了对罗丹明B(RhB)的光催化降解效率。在此基础上,阐述了SiO_(2)@Bi_(2)O_(3)核壳微球的形成机理和SiO_(2)@BiOCl-Bi_(24)O_(31)Cl_(10)核壳微球的光催化降解机理。
Tuning the band gap and suppressing the recombination of photogenerated electron-hole pairs are important ways to improve the photocatalytic performance of Bi_(2)O_(3) semiconductors.Firstly,SiO_(2)@Bi_(2)O_(3) core-shell microspheres were successfully prepared by solution synthesis and heat treatment methods.And the core-shell composition and coating effect were controlled by the factors of changing feed ratio and heat treatment temperature.In order to further improve the photocatalytic activity,the structure,morphology and composition of SiO_(2)@Bi_(2)O_(3) core-shell microspheres were changed by Cl doping.According to XRD,SEM and TEM,the shell structure of the microspheres was determined as BiOCl-Bi_(24)O_(31)Cl_(10) complex.The uniform coating effect of SiO_(2)@BiOCl-Bi_(24)O_(31)Cl_(10) core-shell microspheres was optimized by adjusting the molar ratio and dosages of ammonia and NaCl,where the photocatalytic degradation efficiency of rhodamine B was greatly improved.Based on the above results,the formation mechanism of SiO_(2)@Bi_(2)O_(3)core-shell microspheres and the photocatalytic degradation mechanism of SiO_(2)@BiOCl-Bi_(24)O_(31)Cl_(10)core-shell microspheres were reasonably proposed.
作者
张鑫
许蕊
路馨语
牛永安
ZHANG Xin;XU Rui;LU Xinyu;NIU Yong'an(School of Chemical Engineering,Shenyang University of Chemical Techonology,Shenyang 110142,Liaoning,China;School of Materials Science and Engineering,Shenyang University of Chemical Techonology,Shenyang 110142,Liaoning,China)
出处
《化工学报》
EI
CSCD
北大核心
2022年第8期3636-3646,共11页
CIESC Journal
基金
国家自然科学基金项目(51602206)
辽宁省教育厅面上项目(LJKZ0428)
辽宁省自然科学基金面上项目(2022-MS-292)。
