GO改性ZnO/CeO_2复合纳米光催化剂的制备及其光催化性能研究

Preparation and property of GO modified ZnO/CeO_2 nanocomposite photocatalyst

以改进Hummers法制得的氧化石墨烯(GO)为原料,采用溶胶-凝胶法成功合成GO改性氧化锌(ZnO)/二氧化铈(CeO_2)(ZnO/CeO_2)复合纳米光催化剂,并对产物的结构、组成及其形貌进行了表征,并以刚果红(CR)为目标降解污染物,考察了不同配合比的产物在紫外光照射下的光催化性能。研究结果表明:在CeO_2与ZnO摩尔配合比为1∶50,GO用量为0.8g,GO改性ZnO/CeO_2复合纳米光催化剂的用量为1.0g/L,pH=10,反应120min条件下,GO改性ZnO/CeO_2复合纳米光催化剂对100mL(50mg/L)CR的降解率高达94.12%。与相同条件下ZnO/CeO_2复合纳米材料相比,GO改性ZnO/CeO_2复合纳米光催化剂的光催化性能得到了明显提高。

Graphene oxide(GO)modified ZnO/CeO2 nanocomposites with excellent photocatalytic performances were successfully synthesized by a facile sol-gel method utilizing GO sheets as raw materials acquired by modified Hummers’method.The structure,composition and morphology of samples were characterized.The photocatalytic degradation properties of ZnO/CeO2 modified by GO with different addition ratios were examined under UV irradiation applying congo red(CR)dye as model pollutant.The results showed that the composites displayed an enhanced photocatalytic capability in the degradation of CR dye as compared with ZnO/CeO2 nanocomposites under the same conditions.Under the optimum conditions,the optimal pH was 10,the molar ratio of cerium oxide to zinc oxide was 1∶50,GO was 0.8 g,catalyst loading was 1.0 g/L,and the degradation rate of 100 mL(50 mg/L)CR dye with GO modified ZnO/CeO2 under UV light irradiation was up to 94.12%.