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为使TiO2能够在可见光下发挥其于紫外激发下的高光催化活性,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,再将其负载到球形活性炭(SAC)表面,制备出可见光响应的负载型Er3+:YAlO3/TiO2-SAC光催化剂。通过XRD、EDS、SEM与FSA等手段对制备的光催化剂进行晶相、表面结构与元素分布、发光光谱等表征。以甲基橙为目标污染物,研究制备的光催化剂在可见光下的催化活性。结果表明,Er3+:YAlO3可以作为上转换发光材料,它吸收可见光并发射紫外光进而激发TiO2。700°C煅烧制备的催化剂具有最佳的光催化活性,可见光下表观反应速率常数可达0.0197min-1。
In order to make TiO2 exhibit its high photocatalytic activity under UV excitation in visible light and easily separated from the treated wastewater, TiO2 was combined with Er3 +: YAlO3, an upconversion luminescent material doped with rare earth ions Er3 + by sol-gel method, And then loaded onto the surface of spherical activated carbon (SAC) to prepare a visible-light-responsive supported Er3 +: YAlO3 / TiO2-SAC photocatalyst. The prepared photocatalysts were characterized by XRD, EDS, SEM and FSA. The crystal structure, surface structure, elemental distribution and luminescence were characterized. With methyl orange as the target pollutant, the catalytic activity of the prepared photocatalyst under visible light was studied. The results show that Er3 +: YAlO3 can be used as upconverting luminescent material, which absorbs visible light and emits ultraviolet light and then activates the TiO2 photocatalyst prepared by calcination at 700 ° C. The apparent reaction rate constant under visible light can reach 0.0197min -1.