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以膨胀珍珠岩为漂浮型载体,采用溶胶凝胶法制备B和N共掺杂的B-N-TiO_2/EP可见光催化材料和单一N掺杂的N-TiO_2/EP可见光催化材料。应用X射线粉末衍射(XRD)、扫描电镜(SEM)、紫外-可见(UV-Vis)光谱、N2吸脱附(BET)、X射线光电子能谱(XPS)等手段对催化剂进行表征。并以可见光为光源,评价了该催化剂催化降解罗丹明B的活性,考察了不同B掺杂量对该催化材料性能的影响。实验结果表明,与N-TiO_2/EP相比,B-N-TiO_2/EP吸收光谱发生了明显的红移,可见光吸收强度更大。B的掺杂可以抑制TiO_2晶型从锐钛矿向金红石的转变。B0.57-N-TiO_2/EP对罗丹明B降解效果最好,可见光条件下反应3 h,罗丹明B去除率高达93%以上,B0.57-N-TiO_2/EP催化材料重复利用4次仍有75%的去除率,显示了较好的稳定性和重复利用性。
B-N-TiO 2 / EP visible light photocatalytic materials and single N-doped N-TiO 2 / EP visible light photocatalytic materials were prepared by sol-gel method using expanded perlite as the carrier. The catalysts were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy, N2 adsorption and desorption (BET) and X-ray photoelectron spectroscopy (XPS) The catalytic activity of this catalyst for the degradation of rhodamine B was evaluated using visible light as a light source. The effects of different B doping levels on the properties of the catalytic material were investigated. The experimental results show that compared with N-TiO 2 / EP, the absorption spectra of B-N-TiO 2 / EP show obvious red shift, and the visible light absorption intensity is greater. The doping of B can inhibit the transition of TiO 2 crystal form from anatase to rutile. B0.57-N-TiO_2 / EP had the best degradation efficiency on Rhodamine B, the rhodamine B removal rate was over 93% under visible light conditions for 3 h, and the B0.57-N-TiO_2 / EP catalytic material was reused for 4 h There is still 75% removal rate, showing good stability and reusability.