钬掺杂TiO_2/碳气凝胶电极电吸附光催化降解双酚A

Degradation of Bisphenol A by Electrosorptive-Photocatalytic Process on Ho^(3+) Doped TiO_2/Carbon Aerogel Electrode

采用浸渍法在碳气凝胶(CA)基底上负载了Ho掺杂TiO_2纳米颗粒,由SEM表征观察到CA为疏松多孔结构,Ho掺杂TiO_2粒径约为20 nm。XRD显示TiO_2为锐钛矿相。紫外-可见漫反射光谱显示,Ho掺杂TiO_2碳气凝胶的吸收带边红移至403 nm。在可见光照条件下,其光电流密度是Ho掺杂TiO_2/FTO的66倍。Ho掺杂TiO_2碳气凝胶电极进一步应用于对双酚A(BPA)废水的电吸附光催化降解,结果显示,在4.5 h内,双酚A的去除率达到了96.4%,在电吸附和光催化的协同作用下,实现了对双酚A模拟废水的高效降解。

Ho^3＋ doped TiO2 photocatalyst was loaded on carbon aerogel （CA） substrate with good adsorption properties by sol impregnation approach. SEM image showed that CA had network structure, the size of Ho^3＋ doped TiO2 nanoparticles was about 20 nm. The diffraction peaks of anatase TiO2 were exhibited in XRD. The UV-vis diffuse reflectance spectra showed that the optical absorption edge for Ho^3＋ doped TiO2/CA was red-shifted to 403 nm. Under visible light irradiation, the photocurrent density increment on Ho^3＋ doped TiO2/CA was 66 times of that on Ho^3＋ doped TiO//FTO. The Ho^3＋ doped TiOJCA electrode was further applied in the electrosorptive photodegradation of the bisphenol A （BPA） wastewater. The result showed that the removal ratio of BPA in 4.5 h on Ho^3＋ doped TiO2/CA is 96.4%. The efficient degradation of pollutants was achieved by the synergistic effect between electrosorption and photocatalysis.