화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.29, No.8, 1086-1093, August, 2012
DOI10.1007/s11814-011-0300-5  Export Citation
Removal of Pb(II) from aqueous solutions by adsorption onto clayey soil of Indian origin: Equilibrium, kinetic and thermodynamic profile
Papita Das Saha, Shamik Chowdhury†, Siddhartha Datta1, and Shyamal K Sanyal1
  • Department of Biotechnology, National Institute of Technology, Mahatma Gandhi Avenue, Durgapur (WB) 713209, India
  • 1Chemical Engineering Department, Jadavpur University, 188, Raja Subodh Chandra Mullick Road, Jadavpur, Kolkata (WB) 700032, India
E-mail:
The feasibility of applying natural, untreated clayey soil as low-cost alternative adsorbent for Pb(II) removal from aqueous solutions was investigated with a batch experimental set-up. Experiments were carried out as a function of initial solution pH (1-8), contact time (10-360 min), initial Pb(II) concentration (20-100 mg L^(-1)), adsorbent dose (0.5-5 g) and temperature (303-333 K). Adsorption equilibrium data were well described by the Langmuir isotherm with maximum adsorption capacity of 121.86 mg g^(-1) at 303 K. Adsorption of Pb(II) followed pseudo-second-order kinetics. Gibbs free energy (ΔG0) was spontaneous for all interactions, and the adsorption process exhibited exothermic enthalpy values. The adsorbent was easily regenerated by using 0.1M HNO3 solution and was reused for five sorptiondesorption cycles without any considerable loss in adsorption capacity. It could be concluded that clayey soil may be used as an inexpensive and effective adsorbent without any treatment or any other modification for the removal of Pb(II) ions from aqueous solutions.
Keywords:Adsorption;Clayey Soil;Pb(II);Equilibrium;Kinetics;Thermodynamics
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