Ag-TiO2/蒙脱土复合纳米光催化剂的研究

本文以蒙脱土(简称MMT)为载体,利用四氯化钛水解法将纳米TiO2引入到蒙脱土层间,经500℃煅烧后得到稳定结构的TiO2柱撑蒙脱土,再通过化学还原法将金属银负载于其上,合成出载银/二氧化钛柱撑蒙脱土复合光催化剂(Ag-TiO2/MMT).通过XRD、IR、BET、AAS等分析方法对复合光催化剂的物相组成、键合状况、比表面积、元素含量等物化性质进行了表征.对降解亚甲基蓝的光催化活性测试表明具有如下的光催化活性序列:Ag-TiO2/MMT>TiO2/MMT>TiO2(P25),其中Ag-TiO2/MMT由于柱化后具有较大的比表面积和Ag的负载改性而具有最高的光催化活性.

Studies on Ag-TiO2/Montmorillonite Composite Nanosized Photocatalyst

In this paper,Ag-TiO_(2)/montmorillonite(Ag-TiO_(2)/MMT) composite photocatalyst is synthesized by using a method of TiCl_(4) hydrolysis to introduce nanosized TiO_(2) into the interlayer space of montmorillonite(MMT).For obtaining pillared TiO_(2)-MMT with stable structure it was calcined at 500~(o)C,then silver was loaded by a chemical reduction route.The physico-chemical properties of the composite photocatalyst,such as phase composition,bonding status,specific surface area,element content etc.are characterized by using XRD,IR,BET and AAS techniques.The photocatalytic activity for methylene blue degradation is as follows: Ag-TiO_(2)/MMT>TiO_(2)/MMT>TiO_(2)(P25).Among them the Ag-TiO_(2)/MMT has the highest photocatalytic activity because of its larger specific surface area caused by pillaring and modification by loading of silver.