Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

Chengwen Song, Shuaihua Wu, Murong Cheng, Ping Tao, Mihua Shao and Guangrui Gao
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Chengwen Song: School of Environment Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China
Shuaihua Wu: School of Environment Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China
Murong Cheng: School of Environment Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China
Ping Tao: School of Environment Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China
Mihua Shao: School of Environment Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China
Guangrui Gao: School of Environment Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China

Sustainability, 2013, vol. 6, issue 1, 1-13

Abstract: Removal of Pb 2+ from aqueous solutions using coconut shell carbons produced by KOH activation is performed in this paper. Morphology and pore structure characteristic of coconut shell carbons are analyzed by SEM and nitrogen adsorption techniques. Effects of adsorbent concentration, agitation time and initial ion concentration on the adsorption behavior are investigated, and adsorption isotherm and kinetics on coconut shell carbons are also studied. The results show that high weight ratio of KOH/sample is favorable to produce rich porous structure. The resultant coconut shell carbons with a high specific surface area of 1135 m 2 /g is obtained and demonstrates good adsorption potential on removal of Pb 2+ from aqueous solutions. Adsorption data fit well with Freundlich and Halsey isotherms. The kinetic studies indicate that adsorption behavior can be described by pseudo-second-order kinetic model, which also follows external diffusion and intra-particle diffusion in the adsorption process.

Keywords: coconut shell carbons; removal; porous; isotherm; kinetics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2013
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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