离子液体-水混合介质中合成介孔TiO_2及光催化活性  

Synthesis and photocatalytic activity of mesoporous TiO_2 from ionic liquid-water solvent mixture

作　　者：陈孝云[1] 陆东芳[2] 谭非[1] 林淑芳[1] 

机构地区：[1]福建农林大学材料工程学院,福建福州350002 [2]福建农林大学园林学院,福建福州350002

出　　处：《材料热处理学报》2013年第10期17-24,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(31000269);福建省高校杰出青年科研人才培育计划(JA11072);福建省教育厅基金(JA10121)

摘　　要：以四氯化钛为钛源，离子液体1-丁基-3-甲基咪唑六氟磷酸盐（[Bmim]PF6）／水为混合溶剂，采用液相水解-沉淀法合成纳米TiO2光催化剂。以苯酚为模型物，考察了TiO2紫外下催化活性。采用XRD、TG／DSC、TEM、FTIR、DRS、低温N2物理吸附．脱附等技术对催化剂的结构进行表征。结果表明，在离子液体／水混合溶剂中合成TiO2的光催化活性较纯水溶剂中合成TiO2的光催化活性高，且在较宽的活化温度范围内（500—700℃）都表现出较高的光催化活性。这-结果可归因于在离子液体／水混合介质中合成的TiO2颗粒小、分散性好、比表面积大（138m^2／g）、吸附性能强。另外，离子液体的存在-定程度上降低了TiO2粒子表面羟基数量及表面酸度，提高了锐钛矿相TiO2向金红石相转变的温度。Mesoporous TiO2 was synthesized by a hydrolysis-precipitation method using ionic liquid （[ Bmim] PF6 ）-water mixture as solvent and using TiCl4 as precursor. Catalyst characterization of the material was studied by means of XRD, TG/DSC, TEM, FTIR, DRS and N2 adsorption-desorption. The photocatalytic activity of TiO2 was investigated by the degradation of phenol under ultraviolet light irradiation. The results show that TiO2 synthesized in ionic liquid （ [ Bmim ] PF6 ）-water solvent mixture exhibits higher activity at wide calcination temperatures （ 500 - 700℃） than that synthesized in water solvent. The higher photocatalytic activity is attributed to the small grain size, better dispersion and high specific surface area （138 m2/g） of the catalyst. In addition, ionic liquid can reduce the surface hydroxyl groups and surface acidity in the catalyst of TiO2 , and retards phase transformation.

关 键 词：离子液体 二氧化钛 介孔 光催化 

分 类 号：TQ012[化学工程] X703[环境科学与工程—环境工程]