RGO-ZnO纳米复合材料的制备及其对亚甲基蓝的吸附降解

Preparation of RGO-ZnO nanocomposite and its adsorption and degradation of methylene blue

采用溶剂热法制备了不同石墨烯(RGO)掺杂量(0,3%,6%,9%和12%(摩尔分数))的RGO-ZnO纳米复合材料。通过XRD、SEM、FT-IR和光催化降解测试对复合材料的晶体结构、微观形貌、光谱特性和光催化性能进行了分析。结果表明,RGO的掺杂提高了ZnO的结晶度,但未改变纤锌矿ZnO的纳米结构;纯ZnO的发光强度最高,掺入RGO后Zn-O键的特征吸收峰强度降低,随着RGO掺杂量的增加,复合材料的光致发光强度先降低后升高,当RGO的掺杂量为9%(摩尔分数)时,光致发光强度最低;光催化测试表明,在120 min时,9%(摩尔分数)RGO-ZnO纳米复合材料对亚甲基蓝的降解速率最大为90.24%,光催化性能最优;形貌分析可知,球状ZnO颗粒在片层状RGO上生长,且复合材料的形貌有从球状变成棒状的趋势,RGO和ZnO成功复合。

RGO-ZnO nanocomposites with different graphene(RGO)doping amounts(0,3 mol%,6 mol%,9 mol%and 12 mol%)were prepared by solvothermal method.The crystal structure,micro morphology,spectral characteristics and photocatalytic properties of the composites were analyzed by XRD,SEM,FT-IR and photocatalytic degradation tests.The results showed that the doping of RGO improved the crystallinity of ZnO,but didn’t change the nanostructure of wurtzite ZnO.The luminescence intensity of pure ZnO was the highest,and the characteristic absorption peak intensity of Zn-O bond decreased after the incorporation of RGO.With the increase of RGO doping amount,the photoluminescence intensity of the composites first decreased and then increased.When the doping amount of RGO was 9 mol%,the photoluminescence intensity was the lowest.The photocatalytic test showed that at 120 min,9 mol%RGO-ZnO nanocomposites had the highest degradation rate of methylene blue,90.24%,and the photocatalytic performance was the best.The morphology analysis showed that spherical ZnO particles grew on lamellar RGO,and the morphology of the composite tended to change from spherical to rod,and RGO and ZnO were successfully compounded.