高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

选择性萃取对沉积物非残渣态、粘土矿物结构及吸附特性的影响

王晓丽2, 李鱼1,2, 王一喆3, 董德明2, 李绪谦2   

    1. 华北电力大学能源与环境研究中心, 北京 102206;
    2. 吉林大学环境与资源学院, 长春 130012;
    3. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:2007-05-14 修回日期:1900-01-01 出版日期:2008-02-10 发布日期:2008-02-10
  • 通讯作者: 李鱼

Effect of Selective Extraction on the Non-residual Fractions, Structures and Adsorption Characteristics of Clay Mineral in the Surficial Sediments

WANG Xiao-Li2, LI Yu1,2*, WANG Yi-Zhe3, DONG De-Ming2, LI Xu-Qian2   

    1. Energy and Environmental Research Centre, North China Electric Power University, Beijing 102206, China;
    2. College of Environment and Resources, Jilin University, Changchun 130012, China;
    3. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2007-05-14 Revised:1900-01-01 Online:2008-02-10 Published:2008-02-10
  • Contact: LI Yu

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被引次数

14

摘要： 用NH2OH·HCl, (NH4)2C2O4和H2O2对表层沉积物中非残渣态的Mn氧化物、Fe/Mn氧化物和有机质进行选择性化学萃取, 同时提取粘土矿物, 并对提取前后的表层沉积物样品进行了比表面积、FTIR、ESEM和XRD等分析. 结果表明, 萃取后沉积物的比表面积显著增大, 沉积物颗粒的分散度随之增大, 晶体边缘逐渐清晰, 棱角逐渐分明, 但沉积物的XRD和FTIR谱图变化不大, 原因在于XRD和FTIR谱图中的特征峰主要是由矿物组分产生的. 萃取后随着沉积物分散度的增大, 晶体颗粒表面粗糙度减弱, 沉积物的吸附能力降低, 表明颗粒表面特征对重金属的吸附起到一定作用; 而沉积物的比表面积与沉积物吸附能力之间的反比关系说明沉积物主要吸附组分对其吸附的贡献远远大于沉积物表面与孔隙结构的贡献.

关键词: 表层沉积物, 选择性萃取, Fe/Mn氧化物, 粘土矿物, 吸附

Abstract: The selective extraction and separation of Mn oxides, Fe/Mn oxides and organic materials were performed via NH2OH·HCl, (NH4)2C2O4 and H2O2, and the surface area, infrared spectra, scanning electron micrographs and X-ray powder diffraction patterns of the sediments before and after extraction treatments were also investigated. The results indicate that the surface and particulate characteristics of the sediments after each extraction significantly changed, and the BET specific surface area increased, dispersing degree of the sediment particles enhanced, as well as the crystal structure was more distinct. But XRD and FTIR spectra changed slightly after each extraction due to the identified peaks were mainly contributed by minerals in the sediments. The adsorption capacities of the sediments after extraction decreased along with the dispersing degree increase of the sediment particles, the coarse of sediment surfaces was weakened, implying that the surface characteristics of the sediments also contributed to the adsorption of heavy metals to the sediments. And the negative correlation between the BET specific surface areas and the adsorption capacities of the sediments suggests that the adsorption contributions from the sediment components were significantly greater than those from surface and pore structure of the sediments.

Key words: Surficial sediments, Selective extraction, Fe/Mn oxides, Clay mineral, Adsorption

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