화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.33, No.10, 2898-2907, October, 2016
DOI10.1007/s11814-016-0160-0  Export Citation
Equilibrium kinetic and thermodynamic studies of Cr(VI) adsorption onto a novel adsorbent of Eucalyptus camaldulensis waste: Batch and column reactors
Hajira Haroon1, 2, Tayyab Ashfaq1, 3, Syed Mubashar Hussain Gardazi1, 3, Tauqir Ali Sherazi4, Muhammad Ali4, Naim Rashid5, and Muhammad Bilal1, 3, †
  • 1Department of Environmental Science, COMSATS Institute of Information Technology, Abbottabad, 22060, KPK, Pakistan
  • 2Department of Environmental Sciences, University of Haripur, 22620, KPK, Pakistan
  • 3, Pakistan
  • 4Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad, 22060, KPK, Pakistan
  • 5Department of Chemical Engineering, COMSATS Institute of Information Technology, Lahore, 54000, Punjab, Pakistan
E-mail:
Cr(VI) adsorption onto Eucalyptus camaldulensis sawdust (ECS) waste was investigated in batch and column reactors. Various parameters, including the adsorbent dose, pH, initial concentration, particle size, contact time and temperature were optimized. The maximum adsorption capacity (35.58mg g-1, 71.16%) was achieved at pH 2.0. Data fitted well to Freundlich and Halsey’s models (R2=0.992), indicating the multilayer adsorption of Cr(VI). It obeys the pseudo-second order kinetics. Endothermic and non-spontaneous nature of Cr(VI) adsorption was observed with positive values of changes in enthalpy (9.83 kJ mol-1), and Gibbs-free energy (1.52, 1.38, 1.24, 1.10 and 0.97 kJmol-1), respectively. In this column study, the breakthrough curve time increased from 670 to 1,270min by increasing the bed height from 5 to 15 cm, respectively. Column data was found well fitted to bed depth service time model. Adsorption capacity at 60% breakthrough was 2,443.636mg L-1. The study indicates that ECS waste can be a promising adsorbent for Cr(VI) remediation from industrial effluents.
Keywords:Eucalyptus camaldulensis;Chromium (VI);Adsorption Kinetics;Equilibrium Isotherms;Thermodynamics;Column Reactor
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