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1、重庆大学本科学生毕业设计（论文）石墨烯/二氧化锰的制备及其电催化氧化性能研究学 生：万梦学 号：20116568指导教师：刘成伦 专 业：应用化学重庆大学化学化工学院二一五年六月Graduation Design(Thesis) of Chongqing UniversityThe preparation and electrochemical catalytic properties research of Graphene/MnO2 Undergraduate: Wan MengSupervisor: Prof. Liu ChenglunMajor: Applied ChemistryCo
2、llege of Chemistry and Chemical EngineeringChongqing UniversityJune 2015重庆大学本科学生毕业设计（论文） 中文摘要摘 要我国城市化进程迅速发展，城市人口不断增多，产生了大量的城市垃圾，处理垃圾渗滤液成为治理环境过程中面临的一大难题，而电催化氧化法对垃圾渗滤液的处理有显著成效。本文通过氧化还原法成功合成了 MnO2，并通过浸渍法制备出了电催化活性更好的石墨烯（RGO）/MnO 2 复合材料。运用 XRD 和 SEM 表征了复合材料的组成和形貌，并以苯酚溶液为模拟污染物，通过循环伏安检测和差分脉冲检测表征了复合材料的电催化氧化
3、性。对石墨烯/MnO 2 复合材料的合成方法进行了优化，探讨了石墨烯的掺杂量和还原时间对石墨烯/MnO 2 复合材料性能的影响。实验结果指出，当增加石墨烯的掺杂量时，石墨烯/MnO 2 复合材料的电催化活性先增加然后减小，掺杂 15wt%的石墨烯时，石墨烯/MnO 2 复合材料的电催化活性最好，通过差分脉冲法检测，当电解液为 100mg/L 的苯酚溶液时，其峰值电流相比于 MnO2 提高了 54%，其电荷转移电阻降低了 73%。合成复合材料时，以氨水为还原剂，反应时间为 2h 时合成的石墨烯/MnO 2 复合材料具有较好的电催化活性，其电荷转移电阻比未还原的复合材料的降低了 85%，比还原 4
4、h 的降低了20%。 XRD 检测结果表明制备的复合材中 MnO2 为纯度较高、晶型比较单一、结晶度比较好的 -MnO2。SEM 结果表明制备的复合材料中 MnO2 在石墨烯片层上生长，呈层片状分布。循环伏安结果表明，当扫描速度增加增加时，峰值电流增加，峰值电流与扫描速率有着良好的线性关系，可以说明石墨烯/MnO 2 复合材料电催化氧化苯酚为扩散控制过程。关键词：苯酚、石墨烯/MnO 2、电催化、电化学交流阻抗、 XRD重庆大学本科学生毕业设计（论文） ABSTRACTIABSTRACTWith increasing of urban population and increasing urb
5、an waste, waste leachate treatment has become a big problem to environmental governance, through electrochemical method can efficiently loading out most of the garbage leachate pollutants.MnO2 was prepared through oxidation-reduction method，and MnO2 doped with graphene was prepared by impregnation.
6、The electrocatalytic activity of MnO2 was enhanced by doping grapheme. The composition and morphology was determined by XRD and SEM, respectively. The electrocatalytic activity of grapheme/MnO2 to phenol was tested through cyclic voltammetry and differential pulse method. The preparation conditions
7、of composite materials was optimized, and the influences of the amount of grapnene and the reduction times on the electrocatalytic activity of grapheme/MnO2.The results indicated with the increment of graphene amount, the electrocatalytic activity of grapheme/MnO2 was enhanced first, and then was re
8、duced.When the graphene amount was 15wt%, the electrocatalytic activity of grapheme/MnO2 was most. Compared with MnO2, the peak current was 54% more than MnO2, through differential pulse testing with the 100mg/L phenol as electrolyte,and the charge-transfer resistance was reduced 73% testing by elec
9、trochemical impedance spectroscopy.The electrocatalytic activity of grapheme/MnO2 reduced for 2h by ammonium hydroxide was most. The charge-transfer resistance of grapheme/MnO2 reduced for 2h was reduced 85% compared with grapheme/MnO2 oxide, and reduced 20% compared with grapheme/MnO2 reduced for 4
10、h. The result of XRD indicated the MnO2 was -MnO2 with high purity, unitary crystal type and better crystallinity. The SEM declared the MnO2 grew on grapheme sheets, and dispersal as sheets. The result of cyclic voltammetry with the 100mg/L phenol as electrolyte indicated the peak currents increased
11、 linearly with scanning speed and the electriccatalytic oxidation of phenol was controlled by diffusion process. Key words：phenol, grapheme/MnO2, electrocatalytic, electrochemical impedance, XRD重庆大学本科学生毕业设计（论文） 目录II目 录中文 摘要 .IABSTRACT .II1 绪论 .11.1 垃圾渗滤液 .11.1.1 垃圾渗液的特点 .11.1.2 垃圾渗滤液的处理方法 .21.2 电极材料 MnO2 .31.2.1 MnO2的制备 .31.2.2 MnO2的改性 .51.2.3 复合材料的制备方法 .71.3 论文选题的意义及研究内容 .91.3.1 论文的选题意义 .91.3.2 本课题的研究内容 .92 实验方法 .
