离子液体-水混合介质中合成N、F共掺杂宽光域响应多孔TiO_2光催化剂及性能  

Preparation and Properties of N-F Co-Doped TiO_2 Photocatalyst with Wide Range Light Response and Multipore Structure from Ionic Liquid-Water Mixture Solvent

作　　者：陈孝云[1] 陆东芳[2] 黄锦锋[1] 卢燕凤[1] 郑建强[1] 

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

出　　处：《物理化学学报》2012年第1期161-169,共9页Acta Physico-Chimica Sinica

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

摘　　要：以TiCl4为钛源,离子液体-水为混合溶剂,采用液相水解-沉淀法制得浅黄色的N、F共掺杂宽光域响应多孔TiO2光催化剂(TiONF).以苯酚为模型物,考察了TiONF在紫外光区、可见光区及太阳光下催化活性.采用X射线光电子能谱(XPS)、紫外-可见漫反射光谱(DRS)、透射电镜(TEM)、X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱及低温N2吸附-脱附等技术对TiONF的结构进行表征.结果表明,在离子液体-水混合介质中合成适量N、F共掺杂的TiO2在紫外光区、可见光区及太阳光下均表现出较高的活性,且高于纯水介质中合成TiONF的活性.离子液体-水混合介质有利于N、F进入TiO2晶格中;N、F共掺杂后在TiO2表面生成Ti―O―N键,形成新的能级结构,使催化剂的吸收红移至450-530nm,诱发TiO2可见光催化活性;同时,N、F共掺杂提高了TiO2表面羟基数量;还提高了TiO2相转变温度,减缓了相转变速率.另外,在离子液体-水混合介质中合成的TiONF较纯水介质中合成的TiONF粒子小、分散性好、比表面积大.A yellow N-F co-doped TiO2 photocatalyst （TiONF） exhibited high activity over a wide light spectrum range and a multipore structure was prepared by a hydrolysis-precipitation method using an ionic liquid （[Bmim]PF6）-water mixture as the solvent and TiCl4 as the precursor.Photocatalytic activity was investigated by the photocatalytic degradation of phenol under ultraviolet （UV）,artificial visible （Vis）,and solar light irradiation.X-ray photoelectron spectroscopy （XPS）,UV-Vis diffuse reflectance spectroscopy （DRS）,transmission electron microscopy （TEM）,X-ray diffraction （XRD）,Fourier transform infrared （FTIR）,spectroscopy,and N2 adsorption-desorption were used for catalyst characterization.The results show that TiONF synthesis in an ionic liquid-water mixture solvent with suitable N-F doping gives high activity under UV,Vis,and solar light irradiation,and the activities are higher than those obtained by synthesis in pure water.The ionic liquid-water mixture solvent leads to N and F being incorporated into the TiO2 lattice and N-F co-doping can increase the amount of surface OH-on TiO2.The new bandgap formed by N-F doping can induce a second adsorption edge （450-530 nm）,which can be excited by Vis irradiation and induce Vis activity.N-F co-doping retards the phase transformation.In addition,an ionic liquid-water mixture as a solvent benefits the dispersion of TiO2,increases the SBET and reduces the particle size.

关 键 词：TIO2 N-F共掺杂 离子液体 光催化剂 可见光 

分 类 号：O643.36[理学—物理化学]