Bi_2Sn_2O_7粉体微波水热法制备及其吸附-可见光催化性能研究  

Microwave-hydrothermal Synthesis of Bi_2Sn_2O_7 and Its Properties of Absorption-visible Light Photocatalytic

作　　者：李磊[1] 龙腾发[2] 何星存[2] 颜昌琪[1] 陈孟林[2] 钟山[2] 

机构地区：[1]广西师范大学化学化工学院,桂林541004 [2]广西师范大学环境与资源学院,桂林541004

出　　处：《硅酸盐通报》2012年第3期711-715,共5页Bulletin of the Chinese Ceramic Society

基　　金：珍稀濒危动植物生态与环境保护省部共建教育部重点实验室基金项目(桂科能1001Z005);广西师范大学青年骨干教师科研基金;广西研究生教育创新计划项目(2011106020703M42)

摘　　要：以物质的量比为1∶1的Bi(NO3)3.5H2O和Na2SnO3.3H2O为原料,采用微波水热法合成Bi2Sn2O7粉体。采用XRD、SEM对粉体的晶相和形貌进行了表征,并以甲基橙为目标污染物,测试粉体的光催化性能。研究了合成时间、合成温度等因素对样品催化性能的影响,同时以KI、NBT及乙腈作为抑制剂,检测光催化过程产生的活性物质。结果表明:200℃、30 min微波水热合成的2 g/L Bi2Sn2O7粉体在暗光条件下搅拌2 h,对20 mg/L甲基橙溶液的吸附率为40%,将其置于250 W的卤素灯下光照2 h,甲基橙溶液的脱色率达95%以上。活性物种的检测表明光催化过程产生的主要活性物种为·OH和·O2-。Bi2Sn207 were successfully synthesized by microwave-hydrothermal method with Bi （NO3 ）3 ·5H2O/Na2SnO3· 3H2O molar ratio of 1：1 as raw material. The crystalline phase and morphology of samples were characterized by XRD and SEM, and their photocatalytic activities were investigated under 250 W halogen lamp by use of the methyl orange as a target pollutant. The effects of synthesis time, temperature, etc factors on the photocatalytic properties during reaction process were detected by use of KI, NBT that the Bi2Sn207 prepared under the conditions of were studied, and the active species released and acetonitrile as inhibitor. The results showed 200 ℃ and 30 min possessed the optimal photocatalytic property. The adsorption rate of 2 g/L Bi2Sn/O7 on 20 mg/L methyl orange solution stiring for 2 h in dark was about 40%, and then, the solution were placed under 250 W halogen lamp for 2 h, the decolorization of methyl orange solution was more than 95%. Furthermore, the main active species released during the photocatalytic degradation process were hydroxyl radicals and superoxide anion.

关 键 词：Bi2Sn2O7 微波水热法 吸附-可见光催化 

分 类 号：O484[理学—固体物理]