片状Bi2O3的制备及其光催化性能

利用化学沉淀法，分别以Bi（NO₃）₃·5H₂O为铋源、稀HNO₃为溶剂和HTMA为沉淀剂，制备出片状Bi₂O₃光催化剂.利用SEM、XRD和BET分别对制备的Bi₂O₃形貌、厚度、晶型和比表面积进行表征，并借助紫外可见漫反射和光化学反应仪对材料的光催化性能进行测试.结果表明：制备的片状Bi₂O₃光催化剂形貌较好，厚度均一，a-Bi₂O₃晶型，对可见光的吸收较强，表现出较好的光催化性能.在模拟可见光300W下，3.0h后Bi₂O₃光催化剂对四环素溶液的降解率可以达到82.6%，远远高于市售纳米Bi₂O₃颗粒.

Preparation of Bi2O3 with plate-like and its photocatalytic property

Bi₂O₃ photocatalyst with plate-like morphology was successfully prepared by the method of chemical precipitation which using Bi(NO₃)₃·5H₂O as the source of bismuth, HNO₃ as solvent and HTMA as precipitants, respectively. The morphology, thickness, crystal form and specific surface area of the as-prepared Bi₂O₃ were characterized by SEM, XRD and BET respectively. Furthermore, the photocatalytic performance of the materials was tested by UV-Vis diffuse reflection and photochemical reaction apparatus. The results showed that the obtained Bi₂O₃ photocatalyst with plate-like morphology has good morphology, uniform thickness, a-Bi₂O₃, stronger absorbent for visible-light and exhibits good photocatalytic property. Under the simulated visible light of 300W, the degradation rate of tetracycline wastewater can be reached to 82.6% after 3.0h, which is much higher than that of commercially nanoparticles Bi₂O₃.