金属有机框架化合物制备多孔碳负载TiO_2光催化剂  

Synthesis of porous carbon supported TiO_2 photocatalyst by metal organic frame compounds

作　　者：苏帅[1] 徐清[1] 范冬梅[1] 干宁[1] SU Shuai;XU Qing;FAN Dong-mei;GAN Ning(Faculty of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2018年第5期102-108,共7页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：浙江省自然科学基金(LY16B050004);宁波市自然科学基金(2014A610045);宁波市科技富民惠民项目(2015C50059);宁波市江北区科技计划项目(2013A0125);宁波大学王宽诚基金

摘　　要：为开发一种易降解水中有机污染物的高效催化剂,使用水热法合成了一种Zn-Ti基的金属有机框架化合物作为前驱体模板,再通过在不同温度下烧结而获得一系列具有高比表面积的介孔新型纳米复合材料.运用XRD、SEM、BET、TG、UV-vis DRS、UV-vis等一系列检测方法对新材料进行表征,并使用高压汞灯作为光源降解亚甲蓝(MB)这一代表性有机污染物来检测其催化效果.结果表明,烧结温度在950℃(ZTOF-P9.5)时表现出良好的催化效果,并且其降解MB的速率是商业型TiO_2(P25)的2.5倍,主要是因为锐钛矿型和金红石型TiO_2混合掺杂;此外,由于Zn2+被碳热还原成金属Zn,而Zn在高于其沸点的条件下蒸发,从而形成较高比表面积和均匀的孔径分布,所以显著提高了该催化剂的光催化活性.To develop a highly efficient catalyst for the degradation of organic pollutants in water,a Zn-Ti based metal organic framework is synthesized as a precursor template using the hydrothermal synthesis method,and then the precursor template is sintered under different temperatures to obtain a series of high specific surface area of mesoporous nanocomposites.The catalyst is characterized by XRD,SEM,BET,TG,UV-vis DRS,UV-vis absorption spectroscopy,and then the high pressure Hg lamp is employed as the light source to degrade the representative organic pollutants-methylene blue（MB）.The results suggest an excellent photocatalytic effect under the catalyst sintering temperature at 950 ℃（ZTOF-P9.5）,and its photocatalytic degradation ability of MB is 2.5 times that of commercial TiO2（P25）.The good results are achieved firstly due to the mixed doping of the anatase and rutile TiO2,followed by the process in which the zinc ions（Zn2＋） are reduced into zinc atom（Zn） and then evaporated under the high temperature.Finally,the catalyst helps form the high specific surface area and homogeneous pore size distribution.As a consequence,the photocatalytic activity of the synthetic catalyst is dramatically enhanced.

关 键 词：水热法 Zn-Ti 介孔纳米材料 光催化 

分 类 号：O69[理学—化学]