锂铝基类水滑石的制备及其光催化性能表征  

Preparation and photocatalytic properties of hydrotalcite-like Li/Al-LDHs

作　　者：孔婷婷[1] 张颖萍[1] 张亚刚[1] 周安宁[1] 

机构地区：[1]西安科技大学化学与化工学院,西安710054

出　　处：《功能材料》2016年第12期12255-12260,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51074122)

摘　　要：CO2作为温室气体的主要成分,其捕集与光催化利用已成为减排的主要手段。高效节能的CO2吸附剂和光催化剂的制备成为近年来研究的热点。本文采用共沉淀法,制备了一系列类水滑石Li/Al-LDHs(Li/Allayered double hydroxides)催化剂。通过原子吸收光谱(AAS)、X射线衍射(XRD)、扫描电镜(SEM)、热重分析(TG)、紫外可见分光光度计(UV)等技术对样品进行表征。考察了不同制备条件(pH值、水浴时间)及Ti^(4+)的添加对类水滑石的结构、形貌及CO_2光催化性能的影响。结果表明,pH值在7~8,水浴时间为36h时的Li3Al1-LDHs结晶度最好。不同摩尔比的Li/Al-LDHs均具有光催化反应活性;Ti1Li3Al1-LDHs的光催化性能较好,CH4产率较高。CO2 （Carbon dioxide）is the main greenhouse gases.The capture and photocatalysis is considered to be one of the effective approaches for reducing carbon dioxide emission.So,the preparation of CO2 adsorption and photocatalysis materials is being a research hot spot,which is of high efficiency and low enregy consumption.A series of Hydrotalcite like Li/Al-LDHs catalytic materials were prepared by coprecipitation method and charac-terized by atoimc absorption spectrophotometer （AAS）,X ray diffraction （XRD）,scanning electron microscopy （SEM）,thermal gravimetric analysis （TG）and ultraviolet visible spectrophotometer （UV）,etc.The influence of preparation condition（contain ph and water bath time）and adding Ti^4＋on the structure,morphology and CO2 photocatalytic properties of LDHs was discussed.The results showed that,the Li3 Al1-LDHs displays the highest crystallinity when the ph in 7-8 and water bath time for 3 6 h.Meanwhile,all the moles ratios of Li/Al-LDHs were photocatalytic activities.The photocatalytic activity and the productivity of CH4 were improved of Ti1 Li3 Al1-LDHs obtained by adding Ti^4＋.

关 键 词：CO2 光催化 类水滑石 Li/Al-LDHs Ti^4+ 甲烷 

分 类 号：TQ424.1[化学工程]