摘要
为使TiO2能在可见光下发挥其于紫外激发的高光催化活性,且易于从处理废水中分离,采用溶胶-凝胶法将TiO2与掺杂稀土离子Er3+的上转换发光剂Er3+∶YAlO3结合再负载到球形活性炭(SAC)表面,制备可见光响应的负载型Er3+∶YAlO3/TiO2-SAC光催化剂并对其进行表征。以甲基橙为目标污染物,研究了制备的催化剂在可见光下催化活性,并探讨不同Er3+∶YAlO3/TiO2的负载方式、负载量等制备条件对光催化剂活性的影响。结果表明,结合方式为Er3+∶YAlO3/TiO2烧结后与SAC在乙醇介质中混合并进行30min磁力搅拌、以Er3+∶YAlO3/TiO2与SAC质量比为1∶4时制备的光催化剂活性最高,甲基橙的脱色率在240min可达97%以上。
In order to develop the high photocatalytic activity of TiO2 under visible light as it under ultraviolet light and easy to be separated from treated waste water, a visible light response and spherical activated carbon （SAC） supported photocatalyst （ Er^3＋ ： YAlO3/TiO2-SAC ） doped with upconversion luminescence agent Er^3＋ ： YAlO3 was prepared by immobilizing Er^3＋ ： YAlO3/TiO2, obtained by combination of Er^3＋ ： YAlO3 and TiO2 using sol-gel method, on the surface of SAC. Methyl orange （MO） was selected as the target compound and the effects of preparation methods and loading amount of Er^3＋ ： YAlO3/TiO2 to SAC on the photocatalytic oxidation activity were investigated. The results showed that Er^3＋ ： YAlO3could perform as the upconversion luminescence which converted the visible light provided by the LED lamp upto ultra violet light. Photocatalysts passed calcination of Er^3＋ ： YAlO3/TiO2, followed by mixed with SAC at 1 ： 4 in weight ratio in ethanol for 30min, possessed the highest photocatalytic activity, which could removed more than 97% of the MO within 240min under visible light irradiation.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第8期1295-1300,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50908096
50908097)
中国博士后科学基金(20100471251)
关键词
可见光
上转换发光
TIO2
活性炭
光催化
visible light
upconversion luminescence
TiO2
activated carbon
photocatalysis
