高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (2): 217.doi: 10.7503/cjcu20160664

• 物理化学 • 上一篇    下一篇

部分还原氧化石墨烯-Fe3O4对水中Mn(Ⅱ)的快速去除

布林朝克1, 郭婷2, 张邦文1(), 戴志安1, 俞慧涛1, 邢瑞光1, 资卢雄1   

  1. 1. 内蒙古科技大学材料与冶金学院
    2. 能源与环境学院, 包头014010
  • 收稿日期:2016-09-21 出版日期:2017-02-10 发布日期:2017-01-17
  • 作者简介:联系人简介: 张邦文, 男, 博士, 教授, 主要从事面向能源及环保的功能材料研究. Email: bangwenz@126.com
  • 基金资助:
    国家自然科学基金(批准号: 51164026)、 内蒙古自然科学基金(批准号: 2015MS0219)和内蒙古科技大学材料与冶金学院青年人才孵化器平台(批准号: 2014CY012)资助

Fast Removal of Aqueous Mn(Ⅱ) Using Partially Reduced Graphene Oxide-Fe3O4

BULIN Chaoke1, GUO Ting2, ZHANG Bangwen1,*(), DAI Zhian1, YU Huitao1, XING Ruiguang1, ZI Luxiong1   

  1. 1. School of Materials and Metallurgy
    2. College of Energy and Environment,Inner Mongolia University of Science and Technology, Baotou 014010, China
  • Received:2016-09-21 Online:2017-02-10 Published:2017-01-17
  • Contact: ZHANG Bangwen E-mail:bangwenz@126.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.51164026), the Natural Science Foundation of Inner Mongolia, China(No.2015MS0219) and the Talent Incubation Funding of School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, China(No.2014CY012)

摘要:

采用改进的Hummers法制备了氧化石墨烯(GO), 继而用一步共沉淀法制备了部分还原氧化石墨烯-四氧化三铁复合物(PRGO-Fe3O4). 采用X射线衍射(XRD)、 场发射扫描电子显微镜(FESEM)、 X射线能量色散光谱(EDX)、 高分辨透射电子显微镜(HRTEM)、 选区电子衍射(SAED)及傅里叶变换红外光谱(FTIR)等技术对其进行了分析表征; 考察了pH值、 接触时间、 吸附材料用量、 共存物质、 GO的还原、 循环使用次数等因素对Mn(Ⅱ)吸附行为的影响. 结果表明, PRGO-Fe3O4中Fe3O4颗粒分布均匀, 大小为15~20 nm, 剩磁和矫顽力均很小. 因Fe3O4颗粒的锚定作用, 石墨烯片层很薄, 使PRGO-Fe3O4对Mn(Ⅱ)表现出高效的吸附性能和良好的循环使用性能: 当pH=7、 PRGO-Fe3O4用量为500 mg/g时, 对201.3211 mg/L的Mn(Ⅱ)溶液仅3 min即达吸附平衡, 吸附率和吸附量分别为99.35%和404.49 mg/g, 磁分离仅需10 s, 经5次循环吸附后, 容量保持率为首次的78%. 机理与热力学研究结果表明, 吸附为吸热、 自发的单层化学吸附.

关键词: 部分还原氧化石墨烯-四氧化三铁, Mn(Ⅱ)的快速去除, 吸附性能

Abstract:

Partially reduced graphene oxide-Fe3O4 composite(PRGO-Fe3O4) was prepared by one step co-precipitation onto graphene oxide(GO) synthesized by modified Hummers method. The as obtained composite was characterized by XRD, FESEM, EDX, HRTEM, SAED, XPS and FTIR. The impact of pH, contact time, dosage, foreign substances, reduction of GO and cycle times on the adsorption performance of the composite towards Mn(Ⅱ) were investigated and the dsorption isotherm, thermodynamics and kinetics were analyzed. The results indicate that Fe3O4 distribute evenly and uniformly in the as-obtained composite, with a fine particle size of 15—20 nm, resulting in a low remanence and coercivity. The composite shows efficient adsorption property and good recycability towards aqueous Mn(Ⅱ) owing to the thin GO sheets in its structure caused by the anchoring effect of Fe3O4. Adsorption equilibrium was reached within 3 min with the adsorption percent and capacity of 99.35% and 404.49 mg/g, respectively, under the conditions of pH=7, dosage 500 mg/L, and initial concentration of Mn(Ⅱ) of 201.32 mg/L, with the subsequent magnetic separation taking only 10 s. After five consecutive cycles, the adsorption capacity of the composite remians 78% that of the first cycle. Analyses on the mechanism and thermodynamics show that the adsorption is an endothermic, sponta-neous and monolayer chemical adsorption step.

Key words: Partially reduced graphene oxide-Fe3O4(PRGO-Fe3O4), Fast removal of Mn(Ⅱ), Adsorption property

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