| 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 |
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| 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。 |
| 关键词: 锌铝水滑石 光催化降解 亚甲基蓝 动力学 |
| 基金项目: |
| Abstract: ZnAl Layered double hydroxides (Zn3Al-LDHs) with Zn/Al 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 photocatalytic degradation methylene blue. The results show that the optimum catalyst amount and the illumination time is 150~200 mg, 120 min, respectively. After 180 min irradiation, the absorption peak of methylene blue solution disappears with a degradation rate of 95% due to the breaking of the chormophoric 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. |
| Keywords: Zn3Al-LDHs photocatalytic degradation methylene Blue dynamics |
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| 钱萍萍,薛继龙,潘国祥,李 远,倪哲明.锌铝水滑石对亚甲基蓝光催化降解性能[J].无机化学学报,2012,28(7):1348-1352. |
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