摘要
以冰乙酸作为模板剂,采用溶剂热法制备了一种Bi_(2)WO_(6)/UiO-66复合光催化剂,探究了不同UiO-66掺杂量对其光催化性能的影响,通过XRD、FTIR、SEM、N_(2)吸附-脱附、UV-VisDRS、PL等手段对复合材料进行表征,以有机染料罗丹明B(RhB)作为目标降解物评价复合材料的光催化性能.结果表明,该复合材料在可见光下光催化降解RhB时具有很强的活性.经过4次循环实验,光催化剂的催化活性没有明显降低.通过自由基捕获实验证明起主要作用的活性物质为空穴(h^(+)),并提出了可能的光催化降解机理为:UiO-66均匀分布在Bi_(2)WO_(6)的表面,增大了复合材料的比表面积,Bi_(2)WO_(6)光生电子转移到UiO-66的表面,降低了电子空穴复合率,h^(+)则位于Bi_(2)WO_(6)表面,直接氧化有机物达到净化效果.
Bi_(2)WO_(6)/UiO-66 photocatalysts were fabricated through solvothermal method using acetic acid as template.The photocatalytic performance of as fabricated composites with different amounts of UiO-66 adding was explored.The as harvested composites were analyzed by XRD,FTIR,SEM,N2 adsorption-desorption,UV-Vis DRS,PL,etc.Rhodamine B(RhB)was used as the target degradation organic dye for the photocatalytic performance evaluation.The results showed that,the composites performed extinguish activity for the photocatalytic degradation of RhB under visible light.There was no significant decrease of the photocatalytic activity even after 4 cycles.The free radical capture experiments indicate that the electron hole(h^(+))was the main active site.And the possible photocatalytic degradation mechanism was proposed.The specific surface area of the composites were enlarged due to the uniform distribution of UiO-66 on the surface of Bi_(2)WO_(6).The electron-hole pairs recombination rate was decreased due to the photogenerated electrons transferring from Bi_(2)WO_(6) to the surface of UiO-66,and h^(+),which was remained on the surface of Bi_(2)WO_(6),directly oxidized the organics to achieve the purification.
作者
高远
赵珊
梁转转
杨艳青
张卫珂
GAO Yuan;ZHAO Shan;LIANG Zhuanzhuan;YANG Yanqing;ZHANG Weike(College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024)
出处
《环境科学学报》
CAS
CSCD
北大核心
2022年第8期179-185,共7页
Acta Scientiae Circumstantiae
基金
山西省基础研究计划项目(No.201801D221341)。
