含Cu水滑石的结构与光催化性能  

Synthesis of CuMgAl Layered Double Hydroxides for Efficient Photocatalysis of Rhodamine B

作　　者：倪哲明[1] 薛继龙[1] 

机构地区：[1]浙江工业大学化学工程与材料学院,杭州310014

出　　处：《高等学校化学学报》2013年第3期503-508,共6页Chemical Journal of Chinese Universities

基　　金：浙江省自然科学基金(批准号:Y406069)资助

摘　　要：采用双滴共沉淀法合成出不同投料摩尔比的碳酸根型水滑石,并用X射线粉末衍射仪(XRD)和傅里叶变换红外光谱仪(FTIR)等对其进行表征,研究了其结构和性质.通过考察水滑石层板中金属阳离子比例和种类的变化对光催化的影响,发现掺入合适比例的Cu阳离子可使水滑石(LDH)的光催化活性有所提高.同时用n(Cu)∶n(Mg)∶n(Al)=2∶1∶1的LDH对50 mL初始浓度为10μmol/L的罗丹明B(RhB)溶液进行光催化实验,发现在13℃(通循环水)、pH=7.84的条件下,150 mg LDHs对罗丹明B的降解率达到85.2%,并且光催化降解量所占比重在50%以上.此外,探讨了光催化过程的动力学和光催化降解机理,发现光催化降解过程符合准二级动力学方程.CuMgAl layered double hydroxides CuMgAL-LDHs with different Cu/Mg/Al molar ratios have been successfully synthesized by the coprecipitation method.The structure and properties of the CuMgAL-LDHs photocatalysts were characterized by X-ray diffraction（XRD）,inductively coupled plasma（ICP） and Fourier transform infrared（FTIR） spectra.The results show that the photocatalytic activity of layered double hydro-xides（LDHs） can be improved with the metal cations of appropriate proportion and species incorporated in octahedral layers of LDHs.The degradation rate with a fixed CuMgAl-LDHs dose of 3 g/L was found to be 85.2% among which the ratio of photocatalytic degradation to total degradation is over 50%,when temperature and pH were 13 ℃ and 7.84,respectively.Meanwhile,it is discovered that the pseudo-second-order kinetic equation best describes the photocatalytic kinetics of Rhodamine B on CuMgAl-LDHs.

关 键 词：水滑石 光催化 罗丹明B 动力学 

分 类 号：O614.121[理学—无机化学]