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

Sustainability

Chengwen Song¹  Shuaihua Wu²  Murong Cheng²  Ping Tao²  Mihua Shao² 

[1] School of Environment Science and Engineering, Dalian Maritime University, 1 Linghai Road, Dalian 116026, China;

关键词: coconut shell carbons;    removal;    porous;    isotherm;    kinetics;   

DOI  :  10.3390/su6010086

来源: mdpi

【 摘 要 】

Removal of Pb²⁺ 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 m²/g is obtained and demonstrates good adsorption potential on removal of Pb²⁺ 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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.