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.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2012年第7期1348-1352,共5页
Chinese Journal of Inorganic Chemistry
关键词
锌铝水滑石
光催化降解
亚甲基蓝
动力学
Zn3A1-LDHs
photocatalytic degradation
methylene Blue
dynamics
