摘要
采用水热法制备了BiPO_4-BiVO_4复合光催化剂,运用XRD,SEM,UV-Vis DRS技术对其进行了表征,并以亚甲基蓝为目标降解物考察了复合光催化剂在模拟太阳光下的光催化性能。实验结果表明:当BiPO_4与BiVO_4的摩尔比(磷钒比)为2∶8时BiPO_4-BiVO_4的光催化性能最优,光照180 min时对亚甲基蓝(初始质量浓度5mg/L)的降解率达96.20%,反应速率常数为0.018 1 min-1,明显优于单纯BiPO_4和BiVO_4。表征结果显示:单斜相的BiPO_4与BiVO_4晶粒实现了复合生长,BiPO_4-BiVO_4(磷钒比2∶8)的晶粒粒径比单纯BiPO_4和BiVO_4小;复合光催化剂在紫外光和可见光区均具有较好的光响应,且其禁带宽度较BiPO_4明显减小。
BiPO4-BiVO4 composite photocatalyst was prepared by hydrothermal method and characterized by XRD, SEM, UV-Vis DRS. Using methylene blue （MB）as the degradation object, the photocatalytic capability of the composite photocatalyst was investigated under simulative sunlight irradiation. The experimental results show that the BiPO4-BiVO4 with 2 ： 8 of molar ratio of BiPO4 to BiVO4 shows the best photocatalytic capability, the degradation rate of MB （initial mass concentration 5 mg/L）is 96.20% after 180 min irradiation and the reaction velocity constant is 0.018 1 min^-1, which are much higher than those on mere BiPO4 and BiVO4. The characterized results indicate that： The growth of monoclinic BiPO4 combined with BiVO4 crystalline is successfully achieved, and the grain size of BiPO4-BiVO4 （the molar ratio of BiPO4 to BiVO4 is 2 ： 8） is smaller than pure BiPO4 and BiVO4; The composite photocatalyst has good light response under ultraviolet light and visible light, and its band-gap is much narrower than that of pure BiPO4.
作者
孙玉颖
吴娟
马东
马天津
崔春月
Sun Yuying Wu Juan Ma Dong Ma Tianjin Cui Chunyue(Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University Qingdao Shandong 266109, China)
出处
《化工环保》
CAS
CSCD
北大核心
2016年第6期630-634,共5页
Environmental Protection of Chemical Industry
基金
国家自然科学基金项目(51208274
21307065)
山东省自然科学基金项目(ZR2011EL044
BS2012HZ005)
青岛农业大学高层次人才启动基金项目(631016)
