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Bioresour Technol. 2014 Aug;165:166-73. doi: 10.1016/j.biortech.2014.02.069. Epub 2014 Feb 28.

Adsorption characteristics of arsenic from micro-polluted water by an innovative coal-based mesoporous activated carbon.

Author information

  • 1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China. Electronic address: kimkung@126.com.
  • 2State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China. Electronic address: xujin_gong@126.com.
  • 3School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China.
  • 4School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China. Electronic address: zhangxinranhit@163.com.
  • 5School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China. Electronic address: 190684328@qq.com.

Abstract

An innovative coal-based mesoporous activated carbon (NCPAC) was prepared by re-agglomeration, oxidation and two-step activation using coal-blending as precursor. Adsorption capacities of As(III) and As(V) ions (<0.5mg/L) onto NCPAC as a function of pH, adsorbent dose, initial arsenic concentrations, contact time, and adsorption isotherms at 7°C was investigated. The innovative methods promoted total pore volume (1.087cm(3)/g), mesoporosity (64.31%), iodine numbers (1104mg/g), methylene blue (251.8mg/g) and ash contents (15.26%). The adsorption capacities of NCPAC for As(III) and As(V) were found to be strongly dependent on pH and contact time. The optimal pH value was 6. The equilibrium time was 60min for adsorption of As(III) and As(V) by NCPAC. The Langmuir model fitted the experimental data well for both As(III) (R(2)=0.9980) and As(V) (R(2)=0.9988). Maximum adsorption capacities of As(III) and As(V) (C0=0.50mg/L) by NCPAC were 1.491 and 1.760mg/g, respectively.

Copyright © 2014 Elsevier Ltd. All rights reserved.

KEYWORDS:

Adsorption; Arsenic; Coal-blending; Mesoporosity; Two-step activation

PMID:
24631151
[PubMed - in process]
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