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以活性炭(AC)为原材料,采用铁盐化学沉淀法耦合壳聚糖-戊二醛交联改性技术制备磁性活性炭(MAC)。以MAC为载体,采用溶胶-凝胶法制备不同Br/Ti掺杂比的Br-N共掺杂TiO_2/MAC可见光催化复合材料(Brx-N-TiO_2/MAC)。通过XRD、UV-Vis漫反射、BET吸附实验、SEM、XPS表征其结构和化学特征。以水杨酸为模型分子进行光催化降解,评价不同Brx-N-TiO_2/MAC材料的可见光催化活性。实验结果表明,相较于N-TiO_2/MAC可见光催化剂,Br-N共掺杂更能促进催化剂对可见光的吸收。Br_(0.35)-N-TiO_2/MAC对水杨酸的降解效果最好,暗吸附1h、光催化3h后,Br_(0.35)-N-TiO_2/MAC对水杨酸的降解率达到83%,高浓度水杨酸会对光催化反应产生一定的抑制作用,该催化材料重复利用三次后仍有78%的去除率,显示了较好的稳定性。
Activated carbon (AC) was used as raw material to prepare magnetic activated carbon (MAC) by the method of iron salt chemical precipitation coupled with chitosan-glutaraldehyde crosslinking modification. The Br-N co-doped TiO 2 / MAC photocatalytic composite (Brx-N-TiO 2 / MAC) with different Br / Ti doping ratio was prepared by sol-gel method using MAC as the carrier. The structure and chemical characteristics of the composites were characterized by XRD, UV-Vis diffuse reflectance, BET adsorption, SEM and XPS. The photocatalytic degradation of different Brx-N-TiO 2 / MAC materials with salicylic acid as a model molecule was evaluated. The experimental results show that Br-N co-doping can promote the absorption of visible light more than the N-TiO 2 / MAC visible light catalyst. The degradation of salicylic acid by Br_ (0.35) -N-TiO_2 / MAC was the best, and the degradation rate of salicylic acid by Br_ (0.35) -N-TiO_2 / MAC was 83% High concentrations of salicylic acid will have a certain inhibitory effect on the photocatalytic reaction, the catalytic material still has 78% removal rate after repeated use of three times, showing good stability.