不同制备方法对Ag/AgCl光催化脱汞的影响  

Effect of Different Preparation Methods on the Removal of Elemental Mercury over Ag/AgCl Photocatalyst

作　　者：刘牧[1,2] 路好[1] 代冰洁[1] 邢微波 张立享 张安超[1] 

机构地区：[1]河南理工大学机械与动力工程学院,河南焦作454003 [2]神华国能焦作电厂有限公司,河南焦作454001

出　　处：《能源研究与管理》2017年第1期22-26,共5页Energy Research and Management

基　　金：国家自然科学基金项目(51306046;51676064);河南省高校基本科研业务费项目(NSFRF140204);煤燃烧国家重点实验室开放基金项目(FSKLCC1108);河南省自然科学基金项目(12A470003);河南理工大学青年骨干教师项目(YBT2013004)

摘　　要：采用不同制备方法成功地制备了可见光催化剂Ag/AgCl,以VM-3000测汞仪为检测手段,在模拟烟气光催化反应器上考察了该可见光催化剂的单质汞(Hg0)脱除特性;采用N2吸附/脱附、扫描电子显微镜、X-射线衍射、X-射线光电子能谱以及紫外-可见漫反射光谱等表征手段分析了可见光催化剂的物理化学性质。表征分析表明:与改性的共沉淀法制备的Ag/AgCl相比,沉淀-光还原法制备地催化剂的比表面积、总孔容、AgCl衍射峰以及吸光度均有较大幅度的增强;脱汞实验表明荧光灯照射对可见光催化剂的脱汞活性起着重要的作用,在可见光照射下,沉淀-光还原法制备的催化剂表现出最好的脱汞活性,最大脱汞效率高达92%。Visible light responsive Ag/AgCl photocatalysts were successfully prepared by different preparation methods. The removal efficiency of elemental mercury（Hg0） from simulated flue gas over Ag/AgCl was explored in a photocatalytic reactor, A VM-3000 online mercury analyzer was employed to monitor the inlet and outlet Hg0 concentrations. To explore the physical and chemical properties of the photocatalyst, a variety of characterization methods including nitrogen adsorption/desorption, scanning electron microscopy（SEM）, X-ray diffraction（XRD）, X-ray photoelectron spectra（XPS）,and UV-vis diffuse reflectance spectra（DRS） were employed. The characterization results showed that compared with the photocatalyst synthesized by modified co-precipitation method, the photocatalyst prepared by precipitation-photoreduction method displayed larger the BET surface areas, total volume. Moreover, the diffraction peak and absorption spectrum intensity of the photocatalyst synthesized by precipitation-photoreduction method were enhanced. Hg0 removal tests showed that the fluorescent light irradiation had an important effect on the activity of elemental mercury removal. Under visible light irradiation, the photocatalyst prepared by precipitation-photoreduction method displayed a superior Hg0 removal efficiency and the maximum elemental mercury removal efficiency can reach as high as 92%.

关 键 词：Ag/AgCl 光催化剂 可见光 单质汞脱除 

分 类 号：X511[环境科学与工程—环境工程]