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Removal of lead(II) from aqueous solutions by activated carbon developed from surplus sludge

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Abstract

Activated carbon (AC) was prepared from surplus sludge using chemical activation method with the assistance of ZnCl2. The influences of process parameters on the AC’s specific surface area and adsorption capacity for Pb2+ were examined to optimize these parameters. The optimal conditions for the preparation of AC were determined to be activation temperature of 500 °C, activation time of 1 h, impregnation ratio of 1:1 (solid-to-liquid volume) with the 30% ZnCl2 solution (mass fraction), giving the BET surface area of 393.85 m2/g and yield of 30.14% with 33.45% ash. Also, the pyrolysis temperature was found to be the most important parameter in chemical activation. FTIR spectra provided the evidence of some surface structures such as C=C and C-O-C. In the adsorption studies, a rise in solution pH led to a significant increase in adsorption capacity when the pH value varied from 3.0 to 7.0, and the optimal pH for removal of Pb2+ was 7.0. It was observed that the pseudo-second-order equation provided better correlation for the adsorption rate than the pseudo-first-order and the Langmuir model fitted better than the Freundlich model for adsorption isotherm. The adsorption capacity of AC to Pb2+ was 11.75 mg/L at solution pH 7.0, the equilibrium time 480 min and 25 °C. Moreover, the adsorption process is endothermic according to the value of enthalpy change.

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China

    Zhu-wu Jiang  (蒋柱武)

  2. Faculty of Environmental Science and Engineering Technology, Fujian University of Technology, Fuzhou, 350118, China

    Zhu-wu Jiang  (蒋柱武), Xue-jiang Wang  (王学江) & Xue Ning  (宁薛)

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  1. Zhu-wu Jiang  (蒋柱武)
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  2. Xue-jiang Wang  (王学江)
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  3. Xue Ning  (宁薛)
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Correspondence to Zhu-wu Jiang  (蒋柱武).

Additional information

Foundation item: Project supported by the Open Fund of State Key Laboratory of Photocatalysis, China

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Jiang, Zw., Wang, Xj. & Ning, X. Removal of lead(II) from aqueous solutions by activated carbon developed from surplus sludge. J. Cent. South Univ. 21, 3568–3574 (2014). https://doi.org/10.1007/s11771-014-2337-1

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  • DOI: https://doi.org/10.1007/s11771-014-2337-1

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