催化学报 ›› 2011, Vol. 32 ›› Issue (1): 129-134.DOI: 10.3724/SP.J.1088.2010.00738

• 研究论文 • 上一篇    下一篇

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   

  1. 华东理工大学精细化工研究所结构可控先进功能材料及其制备教育部重点实验室, 上海 200237
  • 收稿日期:2010-07-29 修回日期:2010-09-27 出版日期:2011-01-13 发布日期:2014-05-22

Preparation of Nano BiOCl Microsphere and Its Fabrication Machanism

LIU Hongqi, GU Xiaona, CHEN Feng*, ZHANG Jinlong   

  1. Key Laboratory for Advanced Materials, Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China
  • Received:2010-07-29 Revised:2010-09-27 Online:2011-01-13 Published:2014-05-22

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.

关键词: 氯氧化铋, 纳米片, 溶剂热, 微球, 光催化, 甲基橙降解

Abstract: Nano BiOCl 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 Bi3+-containing complexes and the formation of a Bi–O–Bi structure in turn. The Bi–O–Bi structure then combines the Bi3+ in the solution via the interlinking action of the glycol and leads to the formation of BiOCl substructure. The BiOCl substructure grows up radially from the crystal nucleus to form a nano microsphere structure. The surface microporous structure of the nano microsphere favors the adsorption and the mass exchange of the dyes, consequently, the as-prepared BiOCl nano microsphere exhibits a good dye-sensitized visible light photocatalytic activity.

Key words: bismuth oxychloride, nanoplate, solvothermal method, microsphere, photocatalysis, methyl orange degradetion