Adsorptive removal of Pb(II) by activated carbon prepared from Spartina alterniflora: equilibrium, kinetics and thermodynamics

Bioresource Technology
Kunquan Li, Xiaohua Wang

Abstract

Low-cost activated carbon was prepared from Spartina alterniflora by phosphoric acid activation for the removal of Pb(II) from dilute aqueous solution. The effect of experimental parameters such as pH, initial concentration, contact time and temperature on the adsorption was studied. The obtained data were fitted with the Langmuir and Freundlich equations to describe the equilibrium isotherms. The kinetic data were fitted with the Lagergren-first-order, pseudo-second-order and Elovich models. It was found that pH played a major role in the adsorption process. The maximum adsorption capacity for Pb(II) on S. alterniflora activated carbon (SAAC) calculated from Langmuir isotherm was more than 99 mg g(-1). The optimum pH range for the removal of Pb(II) was 4.8-5.6. The Freundlich isotherm model was found to best describe the experimental data. The kinetic rates were best fitted to the pseudo-second-order model. Thermodynamic study showed the adsorption was a spontaneous exothermic process.

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Citations

Jan 16, 2013·Bioresource Technology·Mi LiGuangren Qian
Feb 13, 2016·Journal of Hazardous Materials·Shunlong PanLianjun Wang
Nov 14, 2013·Journal of Environmental Sciences (China)·Zengsheng ZhangJianfu Zhao
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Aug 14, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wei WeiJimin Xie
Oct 24, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Qiantao ShiXiaoguang Meng
Nov 23, 2021·Environmental Technology·Chang LiuShuangchen Ma

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