作　　者： ; ; ; ; ; ;

机构地区： 广西师范大学化学化工学院

出　　处： 《硅酸盐通报》 2012年第3期711-715,共5页

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： 微波水热法 吸附 可见光催化

领　　域： [理学] [理学]