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Removal of Pb2+ and Cd2+ by adsorption on clay-solidified grouting curtain for waste landfills

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Abstract

Pb2+ and Cd2+ in leachate were adsorbed on clay-solidified grouting curtain for waste landfills with equilibrium experiment. The cation exchange capacity was determined with ammonium acetate. And the concentration of heavy metal cations in leachate was determined with atomic absorption spectrophotometer. Their equilibrium isotherms were measured, and the experimental isotherm data were analyzed by using Freundlich and Langmuir models. The results show that the adsorption capacities of the heavy metal cations are closely related to the compositions of clay-solidified grouting curtain, and the maximum adsorption appears at the ratio of cement to clay of 2:4 in the experimental conditions. At their maximum adsorption and pH 5.0, the adsorption capacities of Pb2+ and Cd2+ are 16.19 mg/g and 1.21 mg/g. The competitive adsorption coefficients indicate that the adsorption of clay-solidified grouting curtain for Pb2+ is stronger than that for Cd2+. The adsorption process conforms to Freundlich’s model with related coefficient higher than 0.996.

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Authors and Affiliations

  1. School of Bridge and Structural Engineering, Changsha University of Science and Technology, 410076, Changsha, China

    Chen Yong-gui PhD

  2. School of Geoscience and Environmental Engineering, Central South University, 410083, Changsha, China

    Chen Yong-gui PhD & Zhang Ke-neng

  3. School of Civil Engineering, Hunan University, 410082, Changsha, China

    Chen Yong-gui PhD & Zou Yin-sheng

  4. School of Chemistry and Chemical Engineering, Central South University, 410083, Changsha, China

    Deng Fei-yue

Authors
  1. Chen Yong-gui PhD
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  2. Zhang Ke-neng
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  3. Zou Yin-sheng
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  4. Deng Fei-yue
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Correspondence to Chen Yong-gui PhD.

Additional information

Foundation item: Project (200065) supported by University Key Teacher Foundation of the Ministry of Education of China

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Chen, Yg., Zhang, Kn., Zou, Ys. et al. Removal of Pb2+ and Cd2+ by adsorption on clay-solidified grouting curtain for waste landfills. J Cent. South Univ. Technol. 13, 166–170 (2006). https://doi.org/10.1007/s11771-006-0150-1

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  • DOI: https://doi.org/10.1007/s11771-006-0150-1

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