高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (8): 1316.doi: 10.7503/cjcu20170062

• 研究论文: 无机化学 • 上一篇    下一篇

羟基氧化铁/膨胀石墨复合材料的制备及除砷机制

焦春磊1, 徐从斌1, 李姝谚1, 杨文杰2, 孙宏亮2, 刘伟江2, 焦振寰3, 林爱军1   

  1. 1. 北京化工大学化学工程学院, 北京 100029;
    2. 环境保护部环境规划院, 北京 100012;
    3. 北京市昌平区水务局, 北京 102200
  • 收稿日期:2017-01-26 修回日期:2017-07-14 出版日期:2017-08-10 发布日期:2017-07-14
  • 通讯作者: 林爱军,男,博士,副教授,主要从事环境修复材料与技术研究.E-mail:environbiol@mail.buct.edu.cn E-mail:environbiol@mail.buct.edu.cn
  • 基金资助:

    北京化工大学中央高校基本科研业务费专项资金(批准号:PYVZ1703)和北京化工大学"双一流"建设专项经费(批准号:PY201606)资助.

Preparation and Arsenic Removal Mechanism of Iron Oxyhydroxide/expanded Graphite Composite Material

JIAO Chunlei1, XU Congbin1, LI Shuyan1, YANG Wenjie2, SUN Hongliang2, LIU Weijiang2, JIAO Zhenhuan3, LIN Aijun1   

  1. 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2. Chinese Academy for Environmental Planning, Beijing 100012, China;
    3. Beijing Changping Water Authority, Beijing 102200, China
  • Received:2017-01-26 Revised:2017-07-14 Online:2017-08-10 Published:2017-07-14
  • Supported by:

    Supported by the Fundamental Research Funds for the Central Universities, China(No.PYVZ1703) and the Higher Education and High-quality and World-class Universities, China(No.PY201606).

摘要:

以膨胀石墨为载体材料,采用改进后的综合法制备的羟基氧化铁(FeOOH)为改性材料,在酸性及超声波振荡的条件下对膨胀石墨进行表面接枝,制得羟基氧化铁/膨胀石墨复合材料,并对材料进行扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)表征,随后测试了其除砷性能,并探讨了反应机理.实验结果表明,复合材料中羟基氧化铁通过氢键与化学键均匀负载在了膨胀石墨表面,为亚微米级球状;使用0.5 g复合材料处理50 mL浓度为0.5 mg/L的模拟含砷废水,90 min后去除率可达到99%,且经过处理可以使废水中的砷浓度达到饮用标准;载铁量越高,材料的除砷性能越好,当载铁量达到55%时,使用0.5 g复合材料处理50 mL浓度为2.0 mg/L的模拟含砷废水,1 h后去除率达到72.6%,是普通膨胀石墨的3倍;该除砷过程由解离的羟基氧化铁与砷在复合材料附近完成,符合二级动力学方程和Temkin等温吸附模型.

关键词: 羟基氧化铁, 膨胀石墨, 除砷机制

Abstract:

Iron oxyhydroxide/expanded graphite composites were prepared via surface grafting under the environment of acid and ultrasonic oscillations, with expanded graphite as carrier material and iron oxyhydroxide(FeOOH) prepared as the modifier. Scanning electronic microscopy(SEM), X-ray diffraction(XRD) X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy(FTIR) techniques were employed to characterize the composite. Then the removal performance of arsenic by the composite was determined. The results show that the iron oxyhydroxide loaded on the surface of expanded graphite evenly as the sub-micron spherical by hydrogen bond and chemical bonds. The removal rate of arsenic can reach 99% using 0.5 g composite to treat 50 mL simulated waste water containing 0.5 mg/L arsenic after 90 min, and the treated waste water can reach the drinking standard. The removal rate of arsenic by the composite improves with the increase of iron content in the composite, and when the iron content in the composite reaches 55%, the removal rate of arsenic can reach 72.6% using 0.5 g composite to treat 50 mL simulated waste water containing 2.0 mg/L arsenic within 60 min, three times as high as that of ordinary expanded graphite. In addition, the dissociated iron oxyhydroxide reacts with arsenic in the vicinity of the composite material and the removal process of arsenic confirms to the secondary dynamics equation and Temkin isotherm adsorption model.

Key words: Iron oxyhydroxide, Expanded graphite, Mechanism of arsenic removal

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