锌铝水滑石对亚甲基蓝光催化降解性能  

Photocatalytic Degradation Properties of Methylene Blue over ZnAl Layered Double Hydroxides

作　　者：钱萍萍[1] 薛继龙[1] 潘国祥[2] 李远[1] 倪哲明[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,杭州310032 [2]湖州师范学院化学系,湖州313000

出　　处：《无机化学学报》2012年第7期1348-1352,共5页Chinese Journal of Inorganic Chemistry

摘　　要：采用共沉淀法制备了物质的量的比为3∶1的锌铝水滑石(Zn3Al-LDHs),并用X射线粉末衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)和热重-差热(TG-DTA)等技术对催化剂的结构和性质进行表征。考察了不同催化剂投入量、光照时间等因素对锌铝水滑石降解亚甲基蓝(Methylene Blue)的影响,找到了最佳的催化剂用量为150～200 mg,光照时间为120 min。在最佳实验条件下,光照180 min后亚甲基蓝的特征峰消失,发色基团破坏,其降解率达到了95%左右。此外,通过探讨光催化过程动力学及降解机理,表明该降解反应符合一级反应动力学模型。ZnA1 Layered double hydroxides （Zn3A1-LDHs） with Zn/A1 molar ratio of 3：1 was synthesized by the coprecipitation method. The photocatalysts were characterized by powder X-ray diffraction （XRD）, ultraviolet- visible diffuse reflectance spectroscopy（UV-Vis DRS） and TG-DTA. The effect of the catalyst amount, illumination time was studied on the photocatalytie degradation methylene blue. The results show that the optimum catalyst amount and the illumination time is 150~200 mg, 120 min, respectively. After 180 rain irradiation, the absorption peak of methylene blue solution disappears with a degradation rate of 95% due to the breaking of the chormophorie group. In addition, the degradation kinetics can be described by the first-order kinetic function as suggested by degradation mechanism and the dynamics of the process.

关 键 词：锌铝水滑石 光催化降解 亚甲基蓝 动力学 

分 类 号：O614.241[理学—无机化学] O614.31[理学—化学]