以ZnO、Bi（NO₃）₃·5H₂O、KI为原料，聚乙二醇400为溶剂，利用溶剂热法制备了ZnO-BiOI复合催化剂。通过XRD、SEM、EDX、BET和DRS对产物的结构、形貌、元素组成、比表面积及光学性质进行了表征。以联苯胺水溶液为降解对象，对复合催化剂的光催化性能及循环利用性能进行了研究。结果表明，制备过程中，当ZnO与Bi（NO₃）₃·5H₂O的质量比为3：100时，ZnO-BiOI复合催化剂为纳米微球状且结构均匀，平均粒径为2~3 μm；可见光照反应40 min时，联苯胺的降解率可达到90%以上，具有较高的光催化活性，这可归因于该样品的高结晶度、大比表面积与窄禁带宽度。循环使用3次后，联苯胺的降解率仍为75%，且降解过程符合一级动力学特征。

ZnO-BiOI composite catalysts are prepared via solvothermal method by using ZnO,Bi(NO₃)₃·5H₂O and KI as raw materials,and polyethylene glycol 400 as solvent.The structure,morphology,elemental composition,specific surface area and optical properties of the samples are respectively studied by XRD,SEM,EDX,BET and DRS.The photocatalytic performance and recycling performance of the samples are evaluated by taking benzidine solution as degradation target.It is found that the as-prepared composite catalysts are nano-spheres,uniform in structure,with an average particle size of 2-3 μm when the mass ratio of raw materials is m(ZnO):m(Bi(NO₃)₃·5H₂O)=3:100 during the preparation of catalysts.After exposed to visible light for 40 min,the degradation efficiency of benzidine over ZnO-BiOI composite catalysts can exceed 90%.It verifies that the catalysts possess a higher photocatalytic activity,which can be attributed to their high crystallinity,large specific surface area and low band gap energy.After the composite catalysts has been used continuously for 3 cycles,the degradation efficiency of benzidine over them can still reach 75%.The degradation process conforms to the first-order kinetics.

张晶晶(1995-),女,硕士研究生,研究方向为无机材料,1336055897@qq.com