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可见光激发Pr3+掺杂Y2Sio5/Tio2膜对硝基苯的降解性能
作者:夏光志、茆平1 杨毅1 李燕2 颜学武\刘颖1 
单位:1.南京理工大学环境与生物工程学院 南京210094  2.南京理工大学化工学院 南京210094 
关键词:硅酸钇 上转换材料 二氧化钛 可见光催化 
分类号:X788
出版年,卷(期):页码:2016,44(1):0-0
DOI:
摘要:

采用溶胶-凝胶法制备了 Pr^掺杂上转换材料YzSiO^Pr^YzSiO;)与Ti〇2的复合材料,并以玻璃片(GS)和玻璃纤维滤 膜(OFF)为载体,附载形成Pr^YzSiO/TiO:复合膜。采用X射线衍射仪、扫描电子显微镜、荧光光谱仪和比表面积及孔径分 析仪,对不同载体的Pr^YzSiO^TiO:复合膜的结构性能进行了表征。以硝基苯为目标降解物,考察了薄膜中上转换材料 Pr3+:Y2SiO5与TiO2的最佳质量比和不同载体情况下复合膜的可见光催化性能。结果表明:Pr3+:Y2SiO5与TiO2的最佳质量比 为4%; OS复合膜和OFF复合膜对浓度为5 mg/L硝基苯溶液12 h最佳降解率分别为80%和87%,重复使用4次后的降解 率分别为58%和70%。OFF复合膜综合性能高于OS复合膜,前者对硝基苯在16h去除率可达97%,有机碳(TOC)去除率 高达95%。

 

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Pr^-doped up-conversion materials Y2SiO5 (Pr3+:Y2SiO5) compounded with TiO2 were prepared by a sol-gel method. The Pr3+:Y2SiO5/TiO2 composite films were formed via impregnation of carriers of glass slide (OS) or glass fiber filter (OFF) into the sol. The structural properties of the Pr3+:Y2SiO5/TiO2 composite films were characterized by X-ray diffraction, scanning electron microscopy, fluorescence spectroscopy and specific surface area/pore size analysis, respectively. The visible light catalytic properties of the Pr3+:Y2SiO5/TiO2 composite films prepared at optimum mass ratio of Pr3+:Y2SiO5 to TiO2 and different supporters circumstances for the degradation of nitrobenzene solution were investigated. The results indicate that the optimal mass ratio of Pr3+:Y2SiO5 to TiO2 is 4%, the degradation rates of OS composite film and OFF composite film in 5 mg/L of nitrobenzene solution under visible light irradiation for 12 h are 80% and 87%, respectively. The degradation rates of these films after 4-time reuse are 58% and 70%, respectively. The OFF composite films present a superior visible light photocatalytic property, i.e., the degradation rate and total organic carbon (TOC) removal rate on nitrobenzene under light irradiation for 16 h are 97% and 95%, respectively, which is better than that of the OS composite films.

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