BiOCl纳米片微球的制备及其形成机理

刘红旗;顾晓娜;陈锋;张金龙

【期刊名称】《催化学报》

【年(卷),期】2011(032)001

【摘要】以乙二醇为溶剂,采用溶剂热法制备了BiOCl纳米片微球.BiOCl纳米片交织在一起,形成开放的微孔结构.不同条件下合成的BiOCl形貌分析表明,纳米片微球的形成是乙二醇辅助生长的过程:乙二醇的2个氧原子与1个或2个铋离子配位生成含铋多聚络合物.在溶剂热过程中,Bi3+离子催化乙二醇聚合脱水,生成的水分子反过来原位促进金属醇盐的水解,进而缩聚形成Bi-O-Bi结构.Bi-O-Bi单元利用乙二醇的配位交联作用逐步从溶液相汲取流离的铋离子,生长形成更大的BiOCl组装结构.这些BiOCl纳米片单元以晶核为中心呈辐射状生长,最终形成纳米片微球结构.该微球表面微孔结构有利于其对染料的吸附和传质,因而表现出较好的染料敏化可见光光催化活性.%Nano BiOCI microsphere was prepared by the solvothermal method using glycol as solvent. The as-prepared nano microsphere was composed numerous BiOCl nanoplates, which are fabricated together to form opening microporous structure. The preparation of BiOCl under different solvothermal conditions indicated that the formation of nano microsphere follows a glycol-assisted growth process. Two oxygen atoms in glycol coordinate with one or two Bi3+ ions to produce Bi3+-containing complexes. During the solvothermal treatment, glycol molecules were condensed via the catalysis of Bi3+ ions to produce H2O, which promoted the hydrolysis of