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Sulfonated modification of cotton linter and its application as adsorbent for high-efficiency removal of lead(II) in
Cuihua Dong1, Haiguang Zhang2, Zhiqiang Pang2
1Key Laboratory of Pulp & Paper Science and Technology, Shandong Polytechnic University, Jinan 250353, China; Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Abstract:
Sulfonated modification of cotton linter and its novel application as adsorbent for Pb(2+) in effluent were investigated. Results show that sulfonated cotton linter (SCL) has strong adsorbability for Pb(2+), more than 85% of Pb(2+) can be removed at lower Pb(2+) concentration (<20 mg/L). Its adsorbability for Pb(2+) is related to effluent pH, temperature, and initial Pb(2+) concentration. The adsorption process can reach equilibrium within 8 min, which can be described through the pseudo-second-order kinetic model. The adsorption isotherm is closely fitted with the Temkin isotherm model, which suggests that the adsorption of Pb(2+) on SCL can be regarded as chemical adsorption. The adsorption process of Pb(2+) on SCL is non-spontaneous and endothermic, based on the value of Gibbs free energy and enthalpy. Compared with commercial activated carbon, SCL is simple to prepare and does not require any special technology.
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