摘要
为解决粉体TiO_2在水体系应用时存在易团聚、固液分离困难、循环使用受到限制等问题,以微孔陶瓷为载体,通过溶胶-凝胶和浸渍工艺制备TiO_2/微孔陶瓷负载型光催化材料.研究负载后TiO_2烧成过程中的物质变化、载体对TiO_2晶型转变温度的影响、TiO_2与载体的结合情况、载体对TiO_2半导体性质的影响及负载型光催化材料对亚甲基蓝的催化降解能力及光催化稳定性.结果表明:经负载后TiO_2从锐钛矿型向金红石型的转变温度由700℃提高到900℃;TiO_2以物理方式黏附到微孔陶瓷表面及孔道;经微孔陶瓷负载TiO_2之后,TiO_2的带隙能由3.04 eV增加到3.06 eV;当TiO_2/微孔陶瓷使用量为1 g,紫外光照射5 h,重复使用6次过程中,对亚甲基蓝溶液的去除率均高于90%,TiO_2/微孔陶瓷具有较高的催化活性和使用稳定性.
The aim of this work is to solve the problem that powder of TiO2 is easy to reunite, difficult to be separated from liquid and recycled. With micro-porous ceramics as carrier, TiO2/micro-porous ceramics photocatalyst was obtained by sol-gel and impregnation process. Changes of TiO2 in the process of sintering, transition temperature from anatase to rutile after coated, interface combination status between carrier and TiO2, changes of semiconductor nature of TiO2 after coated, photocatalyst properties and stability of TiO2/micro-porous ceramics on methylene blue were studied. The results showed the transition temperature from anatase to rutile increased from 700 ~C to 900 ~C after coated on carrier, TiO2 was bonded to the surface and pore of micro-porous ceramics by physical method, the band gap of TiO2 increased from 3.04 eV to 3.06 eV after coated on carrier, and the removal rate of methylene blue was all higher than than that of 90% under ultravi- olet irradiation for 5 h with lg TiO2/micro-porous ceramics within 6 times, thus showingthatTiO2/miero-porous ceramic- shas high catalytic activity and stability.
出处
《河北工业大学学报》
CAS
2017年第4期46-52,共7页
Journal of Hebei University of Technology
基金
天津市科技支撑计划(15ZCZDSF00030)
关键词
微孔陶瓷
溶胶-凝胶
二氧化钛
光催化
去除率
micro-porous ceramics
sol-gel
titanium dioxide
photocatalytic
removal rate
