摘 要：以Bi（NO3）3∙5H2O和NaBr、KI为原料，以氧化石墨烯（GO）为载体，通过共沉淀法和沉淀转化等方法制备氧化石墨烯-BiOBr/BiOI复合材料，产品标识为GO(x%)-BiOBr/BiOI，其中nBiOBr/nBiOI=1， x%=1%、2%、3%（GO与BiOBr、BiOI理论质量之和的百分比）。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、紫外可见漫反射（DRS）等表征手段，获取样品的形貌和物相组成。以10mg/L的罗丹明B作为目标物，比较所得各个催化剂的光催化性能。结果表明：在70min以内，催化剂对罗丹明B的降解率由高到低顺序依次为：GO(3%)-BiOBr/BiOI > GO(1%)-BiOBr/BiOI > GO(2%)-BiOBr > GO(2%)-BiOI > GO(2%)-BiOBr/BiOI，沉淀法制备的GO(3%)-BiOBr/BiOI在pH=8的条件下，其光催化效果最好，它降解罗丹明B的降解率达到96。11%；此类催化剂有很高的回收利用价值，在前70min GO(1%)-BiOBr/BiOI对罗丹明B的降解率达到94。39%，回收降解效率为91。08%。另外，沉淀转化法远比共沉淀法光催化效果好，对于GO(2%)-BiOBr/BiOI，前70min内沉淀转化法得到的催化剂对罗丹明B的降解率为52。37%，但共沉淀法制得的产物对其降解率是46。96%（pH=8）。75904

毕业论文关键词：  氧化石墨烯，BiOBr/BiOI复合材料，罗丹明B，可见光催化

Abstract：Series of Graphene oxide-BiOBr/BiOI composite materials were synthesized by coprecipitation and precipitation transformation methods using Bi（NO3）3∙5H2O and NaBr, KI as raw material and graphene oxide (GO) as the carrie。The products are identified as GO (x %) - BiOBr/BiOI, in which nBiOBr/nBiOI was fixed at 1, x % = 1%, 2%, 3% (x% was the percentage of GO to the sum of the theory quality of BiOBr and BiOI )。 These obtained products were characterized by X-Ray diffraction (XRD), BET surface area, Scanning electron microscope (SEM), and UV-vis diffuse reflection (DRS) methods。 Photodecomposition of RhB was chosen as the model system to investigate the catalytic property of the obtained products。 Results show that the degradation rate of RhB with different catalysts decreased in the sequence of GO(3%)-BiOBr/BiOI > GO(1%)-BiOBr/BiOI > GO(2%)-BiOBr > GO(2%)-BiOI > GO(2%)-BiOBr/BiOI。 The highest degradation rate of RhB reaches 96。11% in the early 70 mins, which catalyzed by GO(3%) - BiOBr/BiOI prepared by coprecipitation method under the condition of pH=8。 Besides, the catalyst can be highly recycled。 The degradation rate of RhB still maintained at 91。08% using the recycled catalyst GO (1%) - BiOBr/BiOI as the photocatalyst。 In addition, GO (2%) - BiOBr/BiOI synthesized by precipitation transform method shows better photocatalytic property than that of GO (2%) - BiOBr/BiOI prepared by coprecipitation method, and the degradation rate of RhB was 52。37% , 46。96%, respectively。

Keywords：Graphene oxide, BiOBr/BiOI composite material， Rhodamine B , Visible photocatalytic

目   录

1  前言 1

2  实验部分 1

2。1  试剂和仪器 1

2。2  催化剂的制备方法 2

2。2。1  共沉淀法制备催化剂 2

2。2。2  沉淀转化法制备催化剂 2

2。3  样品表征 2

2。4  光催化性能测定 2

3  结果与讨论 3

3。1  表征谱图分析 3

3。1。1  XRD谱图分析 3

3。1。2  SEM分析 4

3。1。3  紫外-可见漫反射光谱