银掺杂二氧化钛/活性炭复合材料的制备及其光催化性能研究

为提高二氧化钛/活性炭（AC）复合材料对可见光的利用率,基于溶胶-凝胶法制备了银掺杂的二氧化钛/活性炭复合光催化剂。利用一系列测试方法对光催化剂进行了表征,通过亚甲基蓝（MB）和Cr（Ⅵ）废水的降解效果研究了其光催化活性。结果表明,掺杂银的材料,吸附性能和可见光下的光催化性能均得到提升。在材料投加量为400 mg/L情况下,银-二氧化钛/AC复合光催化剂在30 min内对10 mg/L MB溶液的降解率达到98.55%,在60 min内对20 mg/L MB溶液、10 mg/L Cr（Ⅵ）溶液的降解率分别达到76.92%和53.90%;与未掺杂的材料相比,降解率分别提升了14%、47%、137%。这是由于Ag纳米颗粒可以有效地俘获价带电子,减少电子空穴的复合,从而提高了光催化效果。

Study on preparation of silver-doped titanium dioxide/activated carbon composite material and its photocatalytic performance

To improve the visible light utilization of TiO₂/activated carbon composite material,Ag-doped TiO₂/ activated car-bon composite photocatalyst was prepared based on the sol-gel method.A series of analysis methods were used to characterize the photocatalyst,and its photocatalytic activity was studied through the degradation effect of methylene blue and Cr（Ⅵ）wastewater.The results showed that the Ag-doped material had improved adsorption performance and photocatalytic perfor-mance under visible light.When the material dosage was 400 mg/L,the degradation rate of 10 mg/L MB solution by Ag-TiO₂/AC composite photocatalyst was 98.55% within 30 min,and the degradation rates of 20 mg/L MB solution and 10 mg/L Cr（Ⅵ）solution reached 76.92% and 53.90% within 60 min respectively.Compared with the undoped materials,the degradation rates increased by 14%,47% and 137%,respectively.This was because Ag nanoparticles could effectively capture valence electrons and reduce the recombination of electrons and holes,thus improving the photocatalytic effect.