改性累托石负载Zn-TiO_2复合催化剂的制备及其光催化性能的研究  

Preparation and photocatalysis performance study of modified rectories as support to load Zn-TiO_2 composite catalysis

作　　者：徐杰[1] 付林晨 郑建东[1] 凌俊[1] 姚儒霖 刘子伟[1] 

机构地区：[1]滁州学院材料与化学工程学院,安徽滁州239000

出　　处：《环境污染与防治》2017年第1期88-92,共5页Environmental Pollution & Control

基　　金：安徽省质量工程项目(No.2014zjjh042;No.2015sjjd024;No.2015jxtd040);滁州学院校级规划项目(No.2015GH17);国家级大学生创新创业项目(No.201610377022);滁州学院"校绿色化工及核心技术科研创新平台"支持

摘　　要：以碳酸钠对累托石进行改性,并以改性后的累托石为载体,通过溶胶-凝胶法合成改性累托石负载Zn-TiO_2的复合催化剂。采用X射线衍射(XRD)仪、扫描电子显微镜(SEM)、傅立叶红外变换光谱(FTIR)仪、比表面积和孔隙分析仪对催化剂进行表征,研究煅烧温度和Zn掺杂量对催化活性的影响。通过氧化基团捕获实验和复合催化剂重复使用实验,研究了复合催化剂催化氧化酸性大红3R的催化机制和稳定性。结果表明,合成的最优复合催化剂煅烧温度为500℃,Zn掺杂量为0.8%(质量分数),在光照时间为90min时对酸性大红3R的降解率达到100%左右。重复使用3次后,酸性大红3R的降解率下降到78.23%。负载Zn-TiO_2后改性累托石的层状结构变为了片状结构。采用改性累托石作为载体时,其煅烧温度不宜超过700℃。酸性大红3R的降解是以羟基自由基氧化为主,超氧自由基氧化和抑制光生电子-空穴的重新复合为辅的共存氧化机制。Zn-TiO2/rectorie composite photocatalyst was synthesized by using sol-gel method and using rectories as a supporter after modified by Na2CO3. X-ray diffraction （XRD）,the measurement of specific surface area and pore size, scanning electron microscope （SEM） and Fourier transform infrared spectroscopy （FTIR） were used to detect prosperity of catalysis. Zn doping concentration, calcination temperature, catalytic mechanism and repeats times were studied. The results showed that when the calcination temperature was 500 ℃, Zn doping concentration was 0.8% （mass fraction） and irradiation time was 90 min, the degradation efficiency of acid scarlet 3R reached about 100%. The degradation efficiency of acid scarlet 3R decreasesd to 78.23% after 3 times of repeated experiment. The layered structure of modified rectories was destroyed to a certain extent during the preparation process. The calcination temperature should be below 700℃ when using modified rectories as a supporter. The catalytic mechanism might be that the hydroxyl radical was the main active species and superoxide radicals was the secondary active species for degradation of acid scarlet 3R.

关 键 词：改性累托石 TIO2 ZN 光催化 

分 类 号：X703[环境科学与工程—环境工程] TQ426[化学工程]