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巯基硅烷改性氧化石墨对砷的吸附性能

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樊伟, 卞战强, 田向红, 张娟. 巯基硅烷改性氧化石墨对砷的吸附性能[J]. 环境化学, 2013, 32(5): 810-818. doi: 10.7524/j.issn.0254-6108.2013.05.013
引用本文: 樊伟, 卞战强, 田向红, 张娟. 巯基硅烷改性氧化石墨对砷的吸附性能[J]. 环境化学, 2013, 32(5): 810-818. doi: 10.7524/j.issn.0254-6108.2013.05.013
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FAN Wei, BIAN Zhanqiang, TIAN Xianghong, ZHANG Juan. Study on arsenic adsorption performance by sulfhydryl silane modified oxidation graphite[J]. Environmental Chemistry, 2013, 32(5): 810-818. doi: 10.7524/j.issn.0254-6108.2013.05.013
Citation: FAN Wei, BIAN Zhanqiang, TIAN Xianghong, ZHANG Juan. Study on arsenic adsorption performance by sulfhydryl silane modified oxidation graphite[J]. Environmental Chemistry, 2013, 32(5): 810-818. doi: 10.7524/j.issn.0254-6108.2013.05.013
shu

巯基硅烷改性氧化石墨对砷的吸附性能

  • 1.

    中国疾病预防控制中心农村改水技术指导中心, 北京, 102200

Study on arsenic adsorption performance by sulfhydryl silane modified oxidation graphite

  • 1.

    National Center for Rural Water Supply Technical Guidance,Chinese Center for Disease Control and Prevention,Beijing, 102200, China

  • 摘要: 为提高氧化石墨(GO)对砷的吸附能力,以3-巯基丙基三甲氧基硅烷为改性剂,制备了巯基改性的氧化石墨(GO-SH),考察其对水中砷的吸附性能.采用单因素实验法考察了初始pH值、吸附剂投加量、温度等对吸附效果的影响,拟合了吸附等温线,并研究了吸附动力学和吸附热力学规律.实验结果表明,在最优条件下,GO-SH对初始浓度为4 mg·L-1的砷去除率达到97.7%;吸附等温线符合Langmuir和Freundlich模型,45 ℃时由Langmuir模型得到的饱和吸附量(Qm)为24.45 mg·g-1;吸附动力学符合准二级模型,内扩散模型符合高浓度砷的吸附动力学;热力学研究表明,吸附过程是自发吸热的反应,以化学吸附为主.
    Abstract: To improve arsenic adsorption capacity by oxidation graphite, thiol-functionalized oxidation graphite was prepared by 3-mercaptopropyltrimethoxysilane, and the arsenic removal ability was investigated. The effect on arsenic adsorption rate by initial pH, the dosage of the adsorbent, temperature were investigated by single factor experiment method, the adsorption isotherm was fitted, then the adsorption kinetics and thermodynamic were studied. The results indicated that the removal rate of arsenic in aqueous solution was up to 97.7% when arsenic initial concentration was 4 mg·L-1. The adsorption isotherm fit the Langmuir model and Freundlich model, and the maximum adsorption capacity was 24.45 mg·g-1 from the Langmuir model at 45 ℃; The dynamic curve fit pseudo second-order model, and the internal diffusion model accorded with high concentration of arsenic adsorption kinetics; Adsorption thermodynamics research showed that the adsorption process was spontaneous endothermic reaction, and chemical adsorption was priority.
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  • 收稿日期:  2012-08-29

巯基硅烷改性氧化石墨对砷的吸附性能

  • 1. 中国疾病预防控制中心农村改水技术指导中心, 北京, 102200
  • 收稿日期:  2012-08-29

摘要: 为提高氧化石墨(GO)对砷的吸附能力,以3-巯基丙基三甲氧基硅烷为改性剂,制备了巯基改性的氧化石墨(GO-SH),考察其对水中砷的吸附性能.采用单因素实验法考察了初始pH值、吸附剂投加量、温度等对吸附效果的影响,拟合了吸附等温线,并研究了吸附动力学和吸附热力学规律.实验结果表明,在最优条件下,GO-SH对初始浓度为4 mg·L-1的砷去除率达到97.7%;吸附等温线符合Langmuir和Freundlich模型,45 ℃时由Langmuir模型得到的饱和吸附量(Qm)为24.45 mg·g-1;吸附动力学符合准二级模型,内扩散模型符合高浓度砷的吸附动力学;热力学研究表明,吸附过程是自发吸热的反应,以化学吸附为主.

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