水热合成锰离子掺杂磷酸银及其光催化性能  

Hydrothermal synthesis and photocatalytic activity of Mn^(2+)-doped Ag_3PO_4

作　　者：陶萍芳[1] 覃利琴[1] 欧小梅 王荣芳[1] 罗志辉[1] 周能[1] 

机构地区：[1]广西农产资源化学与深度利用重点实验室(培育基地)广西高校桂东南特色农产资源高效利用重点实验室玉林师范学院化学与食品科学学院,广西玉林537000

出　　处：《无机盐工业》2017年第6期90-93,共4页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(21565028);广西自然科学基金项目(2015GXNSFBA139043);玉林师范学院校级科研项目(2015YJZD04)

摘　　要：以水热法合成了二价锰离子掺杂的磷酸银多面体光催化剂。通过X射线衍射(XRD)、扫描电镜(SEM)、紫外可见漫反射吸收光谱(UV-Vis DRS)、光致发光光谱(PL)等对光催化剂进行了表征。以亚甲基蓝溶液为模拟污染物检测了光催化剂的光催化活性,考察了掺杂不同量二价锰离子的磷酸银对亚甲基蓝溶液光催化性能的影响。结果表明:制备的光催化剂为立方晶相多面体磷酸银,二价锰离子在磷酸银内部形成缺陷能级或杂质能级,提高了光生电子-空穴对的分离效率,提高了光催化活性。掺杂6%(物质的量分数)二价锰离子的磷酸银的催化活性最高,0.08 g光催化剂降解200 m L质量浓度为8 mg/L的亚甲基蓝溶液,10 min后降解率达到98.19%。The Mn2＋-doped polyhedral Ag3PO4 photocatalystwas synthesized by hydrothermal method,and characterized by X-ray diffraction, scanning electron microscopy, UV -vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy.The photocatalytic activity ofAg3PO4,doped with different molar mass of Mn2＋ ,was evaluated by degradation of methylene blue aqueous solution.The results showed that the synthesized samples were cubic polyhedral Ag3PO4.The Mn2＋-doped polyhedral Ag3PO4 samples exhibited a high catalytic activity,which mainly due to the doping process with the forma-tion of new energy level of Mn2＋ or MnO2 between conduction band and valence band of Ag3PO4 to reduce the energy gap and the electron-hole recombination rate.The degradation rate of methylene blue can reached 98.19%,using 0.08 g 6% Mn2＋- doped Ag3PO4 as catalyst,as the initial methylene blue was 200 mL（8 mg / L） ,and illumination time was 10 min.

关 键 词：二价锰离子掺杂 磷酸银 水热法 可见光催化 

分 类 号：TQ131.22[化学工程—无机化工]