氧化石墨烯/ZnO的制备及其对亚甲基蓝的吸附性能

Preparation of Graphene Oxide/ZnO and Its Adsorption Properties for Methylene Blue

采用化学沉淀法合成氧化石墨烯(GO)/ZnO复合材料,并通过多种测试技术对其结构和形貌进行表征。研究反应温度、吸附剂加入量、初始溶液浓度和pH值对亚甲基蓝吸附量的影响。采用准一级动力学、准二级动力学、Elovich和颗粒内扩散四种动力学模型对吸附过程进行描述。结果表明,GO/ZnO吸附亚甲基蓝的速度较快,其吸附过程为吸热反应,较好地符合准二级动力学方程。

Graphene oxide/ZnO composites were synthesized by the chemical precipitation method.The structure and morphologies of composites were characterized by various techniques.The experiments were also performed to evaluate the influential parameters such as temperature,amount of adsorbent,initial concentration and initial pH on methylene blue adsorption.Furthermore,the dynamic model,such as pseudo first order,pseudo second order,intraparticle diffusion and Elovich kinetic model,were discussed to evaluate the adsorption performance of the composite materials.The experimental results show rapid removal and fast adsorption process of methylene blue onto the graphene oxide/ZnO adsorbent.And the adsorption process is an endothermic reaction which conforms to the pseudo second order kinetics equation.