Environmental Engineering

Korean Journal of Chemical Engineering

, Volume 29, Issue 1, pp 64-71

Biosorption of chromium onto Erythrina Variegata Orientalis leaf powder

  • Gannavarapu Venkata Vamsi AdityaAffiliated withDepartment of Chemical Engineering, Andhra University
  • , Bhagavatula Padma PujithaAffiliated withDepartment of Chemical Engineering, Andhra University
  • , Nalluri Chitti BabuAffiliated withDepartment of Chemical Engineering, Andhra University
  • , Paladugu VenkateswarluAffiliated withPVP Siddhartha Institute of Technology Email author 

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Abstract

The biosorption of chromium from an aqueous solution onto Erythrina Variegata Orientalis leaf powder was investigated in batch operations. The equilibrium agitation time was 180 min. The extent of chromium biosorption increased from 74.2% to 86.4% with decrease in biosorbent size from 150 to 45 μm for a dosage of 30 g/L. The biosorption decreased from 99.1 (0.45 mg/g) to 45.5% (1.64 mg/g) with an increase in chromium initial concentration (C o ) from 22.5 to 180 mg/L. The extent of biosorption was maximum at pH=3. The experimental data were well explained by Langmuir and Redlich-Peterson isotherm models. The biosorption data followed second-order kinetics with a rate constant of 0.078 g/mg-min for 50 g/L of 45 μm size biosorbent. The biosorption was exothermic and feasible. The biosorption was tending towards irreversibility with increasing temperature.

Key words

Chromium Biosorption Erythrina Thermodynamics