水热法制备Co/ZnO及其光催化降解邻苯二酚的研究

Preparation of Co/ZnO by hydrothermal method and its application in photocatalytic degradation of catechol

利用水热法合成了一系列掺杂型光催化剂Co/ZnO,并对其进行XRD、SEM、UV-Vis DRS表征。结果表明,Co/ZnO呈短棒状结构,掺杂金属离子Co后的ZnO禁带宽度明显变窄,对可见光的利用率明显高于纯ZnO。通过光催化降解邻苯二酚评价Co/ZnO的光催化性能,结果表明,4%Co/ZnO光催化降解对邻苯二酚的表观速率常数是纯ZnO的1.95倍。在140℃水热反应16 h条件下制备的Co/ZnO光催化活性较好,在400 W金卤灯光照180 min后,对邻苯二酚的降解率可达99%。

A series of doped Co/ZnO photocatalysts are prepared through hydrothermal method and characterized by XRD,SEM and UV-Vis DRS.The results illustrate that the prepared Co/ZnO exhibits a structure of short rod,the width forbidden band of ZnO narrows significantly after doped with Co metal ion and the utilization of visible light by the prepared Co/ZnO is obviously higher than that of pure ZnO.Through evaluating the photocatalytic performance of Co/ZnO in photocatalytic degradation of catechol,it is found that the apparent rate constant of catechol photocatalytic degradation over 4% Co/ZnO is 1. 95 times that over pure ZnO.The Co/ZnO prepared at 140℃ after 16 h of hydrothermal reaction has a better photocatalytic activity,over which the degradation rate of catechol can reach 99% under 180 min of illumination by 400 w metal halide lamp.