氨基功能化磁性氧化石墨烯吸附亚甲基蓝的性能探讨  

Discussion on adsorption property of amino-functionalized magnetic graphene oxide to methylene blue

作　　者：常会[1] 范文娟[1] 曾成华[1] 邹旺材 CHANG Hui;FAN Wen-juan;ZENG Cheng-hua;ZOU Wang-cai(College of Biology & Chemical Engineering, Panzhihua University, Panzhihua 617000,China)

机构地区：[1]攀枝花学院生物与化学工程学院

出　　处：《冶金分析》2019年第8期52-60,共9页Metallurgical Analysis

基　　金：四川省科技计划项目(2015RZ0029);结构化学国家重点实验室开放项目(20150012);四川省大学生创新创业训练计划项目(201711360020)

摘　　要：以改进的hummers法制备的氧化石墨烯为载体,采用共沉淀法制备出磁性氧化石墨烯,再以乙二胺修饰,制备出氨基功能化磁性氧化石墨烯(EDA-MGO)。通过傅里叶红外变换光谱(FI-IR)、扫描电子显微镜(SEM)和X射线衍射仪(XRD)对材料的官能团、表面形貌和结构组成进行表征,分析EDA-MGO的磁分离和回收性能,并探讨EDA-MGO对亚甲基蓝的吸附性能。结果表明,立方相纳米级磁性Fe3O4均匀负载于氧化石墨烯表面,氨基功能化成功,且EDA-MGO具有很好的磁分离和回收性能。室温下,当亚甲基蓝初始质量浓度为100mg/L、体积为100mL、吸附剂质量为0.07g、pH值为7、吸附时间为150min时,EDA-MGO对亚甲基蓝的吸附率和吸附量分别为97.56%和139.37mg/g,其吸附过程符合拟二级动力学模型和Langmuir等温吸附模型。吸附剂循环使用6次后,吸附量为108.33mg/g,表明EDA-MGO具有很好的再生循环使用能力。The graphene oxide prepared by modified hummers method was used as carrier to prepare magnetic graphene oxide by coprecipitation method. Then the amino-functionalized magnetic graphene oxide (EDA-MGO) was prepared via ethanediamine modification. The functional groups, surface morphology and structure composition of EDA-MGO were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and X-ray diffractometer (XRD). The magnetic separation and recovery properties of EDA-MGO were analyzed. Moreover, the adsorption property of EDA-MGO to methylene blue was also discussed. The results showed that the cubic-phase nano magnetic Fe 3O 4 was uniformly loaded onto the surface of graphene oxide. The amino-functionalization was successful. The prepared EDA-MGO exhibited good magnetic separation and recovery properties. The adsorption rate and adsorption capacity of EDA-MGO to methylene blue was 97.56% and 139.37 mg/g at room temperature, respectively, under the following conditions: the initial mass concentration of methylene blue was 100 mg/L;the volume was 100 mL;the adsorbent mass was 0.07 g;the pH was 7;the adsorption time was 150 min. The adsorption process conformed to the pseudo-second order dynamic model and Langmuir isothermal adsorption model. The adsorbing capacity of adsorbent was still 108.33 mg/g after recycle for 6 times, indicating that EDA-MGO had good performance in regeneration cycle.

关 键 词：氨基功能化 磁性氧化石墨烯 吸附 亚甲基蓝 

分 类 号：O643[理学—物理化学]