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Desalination and Water Treatment Volume 51, 2013 - Issue 13-15
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Articles

Adsorption of lead from aqueous solution onto coir-pith activated carbon

Pradeep Kumar Department of Chemical Engineering and Technology, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India
,
Ramamohan Rao Department of Chemical Engineering, Indian Institute of Technology, Roorkee, 247 667, India
,
Shri Chand Department of Chemical Engineering, Indian Institute of Technology, Roorkee, 247 667, India
,
Sushil Kumar Department of Chemical Engineering, Birla Institute of Technology and Science (BITS), Pilani, Rajasthan, 33 031, India
,
K.L. Wasewar Advanced Separation and Analytical Laboratory, Department of Chemical Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur, Maharashtra, 440 010, IndiaCorrespondence[email protected]
&
Chang Kyoo Yoo EMSEL (Environmental Management & Systems Engineering Lab), Department of Environmental Science and Engineering, College of Engineering, Kyung Hee University, Yongin, 446-701, South KoreaCorrespondence[email protected]
Pages 2529-2535 | Received 07 Jun 2011, Accepted 23 Sep 2012, Published online: 02 Apr 2013
 
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Abstract

Adsorption of lead (Pb(II)) from aqueous solution using H2SO4-activated carbon developed from coir pith (CPAC) was studied. Batch experiments were performed to explain the effect of initial pH (pH 0), contact time, adsorbent dose, and temperature on adsorption. A pH 0 of 5.0, a dose of 1 g L−1 for adsorption at a concentration of Pb of 20 mg L−1 were the optimal conditions. The adsorption of lead onto CPAC was found to be a gradual process and the quasi-equilibrium condition reached in 4 h. The adsorption followed pseudo-second-order kinetics and the adsorption equilibrium followed the Temkin isotherm. Thermodynamic parameters such as ΔG 0, ΔH 0, and ΔS 0 were evaluated by applying the Arrhenius and Van’t Hoff equations, and it was found that adsorption of Pb(II) on CPAC was spontaneous and endothermic.

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