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Surface modification of coconut-based activated carbon by SDS and its effects on Pb2+ adsorption


Coconut-based activated carbons were modified with sodium dodecyl sulfate (SDS). The activated carbons, which were modified by different concentrations of SDS, were characterized by acid/base titrations, textural analysis (BET), atomic absorption spectrochemical analysis and Zeta potential measurements. The effects of SDS modification on Pb2+ absorption were studied further. The results indicate that after the modification of SDS, there are new functional groups on the surface of modified activated carbons and the number of functional group has changed remarkably, the total acidity decreases observably, but the total alkalinity increases dramatically. With the increase of surface load with SDS, the Pb2+ adsorption mass of activated carbons increases and the optimal pH for Pb2+ adsorption of the SDS modified activated carbons is 5. The experimental data are simulated better by Freundlich isotherm model for the modified activated carbons, and the experimental data are simulated better by Langmuir isotherm model for unmodified ones.

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Correspondence to Xiao-lan Song  (宋晓岚).

Additional information

Foundation item: Project(2007AA06Z121) supported by the National High Technology Research and Development Program of China; Project(50774095) supported by the National Natural Science Foundation of China; Project(CL12111) supported by the Undergraduate Innovation Experimentation Plan of Central South University, China

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Song, Xl., Zhang, Mw., Zhang, Y. et al. Surface modification of coconut-based activated carbon by SDS and its effects on Pb2+ adsorption. J. Cent. South Univ. 20, 1156–1160 (2013).

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Key words

  • activated carbon
  • surface modification
  • sodium dodecyl sulfate
  • Pb2+ absorption