离子液体@TiO2纳米复合材料的制备及其光催化性能

Synthesis of Ionic Liquid@TiO_2 Nanocomposites and Their Photocatalytic Performance

利用—Si—O—共价键将离子液体嫁接在纳米TiO_2表面,制备离子液体@TiO_2纳米复合材料,并利用红外光谱、差热分析、元素分析等技术手段进行了分析。光催化性能研究表明,在紫外光照射60 min后,[C8tespim]Br@TiO_2([C8tespim]:N-3-(3-三乙氧基硅烷基丙基)-4,5-二氢咪唑)复合材料能够将甲基橙100%脱色,明显优于TiO_2P25的光催化降解性能。同时发现其光催化性能与阴离子类型有密切关系,活性顺序为[C8tespim]Br@TiO_2<[C8tespim]PF6@TiO_2<[C8tespim]Tf2N@TiO_2。

IL@ TiO2 nanocomposites were synthesized by grafting ionic liquids（ ILs） onto the surface of TiO2 via —Si—O— covalent bond. The prepared nanocomposites were acharacterized by IR,thermal gravitydifferential analysis and elemental analysis. [C8tespim]Br@ TiO2（ [C8tespim]： N-3-triethoxysilypropyl-4,5-dihydroimidazole） can catalyze the degradation of methyl orange to almost colourless after being illuminated by ultraviolet light for 60 min. The superior performance of prepared nanocomposites compared to that of TiO2 nanopaticles suggests that anion-exchange can tailor the photocatalytic activity,and the activity order is[C8tespim]Br@ TiO2〈 [C8tespim]PF6@ TiO2〈 [C8tespim]Tf2N@ TiO2（ Tf2N： bis [（ trifluoromethyl）sulfonyl]imide）.