ZnO/氧化石墨烯的制备及其对亚硝酸盐的光催化降解

利用沉淀法制备了ZnO光催化剂，并将其负载在氧化石墨烯上，制得ZnO/氧化石墨烯复合材料，研究了该复合材料对亚硝酸钠的光催化降解效果。采用XRD和SEM技术对光催化剂进行表征。考察了初始亚硝酸钠质量浓度、溶液pH、ZnO/氧化石墨烯加入量对亚硝酸钠降解效果的影响。表征结果显示：ZnO/氧化石墨烯晶体的晶型发育良好、结晶度高;新生成的混晶结构提高了催化剂的光催化活性。实验结果表明：在初始亚硝酸钠质量浓度246 mg/L、溶液pH 5、ZnO/氧化石墨烯加入量1.0 g/L的条件下，经过150 min的紫外光降解，亚硝酸钠的质量浓度降至70 mg/L，亚硝酸钠的降解率为71.38%;ZnO与氧化石墨烯的协同效应有效提高了光催化反应体系的效率，ZnO/氧化石墨烯对亚硝酸钠的降解能力远高于氧化石墨烯和ZnO。

Preparation of ZnO/Graphene Oxide and Photocatalytic Degradation of Nitrite

The ZnO photocatalyst was prepared by precipitation method and loaded on graphene oxide to prepare the ZnO/graphene oxide composite. The photocatalytic degradation effect of the composite to nitrite was studied. The photocatalyst was characterized by XRD and SEM. The factors affecting the nitrite degradation were investigated. The characterization results show that：The ZnO/graphene oxide crystal has well-developed structure and high crystallinity;The photocatalytic activity of the catalyst is improved by the new mixed crystal structure. The experimental results show that：Under the conditions of initial sodium nitrite mass concentration 246 mg/L,solution pH 5,ZnO/graphene oxide dosage 1.0 g/L and UV-degradation time 150 min,the sodium nitrite mass concentration is reduced to 70 mg/L with 71.38% of removal rate;The efficiency of the photocatalytic reaction system is improved by the synergistic effect between ZnO and graphene oxide. The degradation ability of ZnO/graphene oxide on sodium nitrite is much higher than that of graphene oxide and ZnO.