Uptake and desorption of copper ion using functionalized polymer coated silica gel in aqueous environment

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• 作者：G. Pramod Kumar ; P. Albino Kumar ; Saswati Chakraborty ; Manabendra Ray
• 关键词：Copper uptake and desorption ; Functionalized polymer ; Amine group ; Coordination bond ; Solution pH
• 刊名：Separation and Purification Technology
• 出版年：2007
• 期刊代码：78_13835866
• 类别：ce
• 出版时间：1 October 2007
• 卷：57
• 期：1
• 页码：47-56
• 文件大小：742 K

摘要

A resinous functionalized polymer, aniline formaldehyde condensate (AFC) coated on silica gel was used as an adsorbent to remove copper (Cu²⁺) from aqueous solution under conditions of different initial Cu²⁺ concentration, adsorbent loading, pH and adsorption time. Coordination bond formation between amine group and Cu²⁺ ion was the main mechanism of copper removal. Adsorption increased from 20%at pH 4 to 71%at pH 6 due to less competition from proton. Adsorption equilibrium was achieved within 120–150 min. The kinetics of adsorption followed second order model with rate constant of 0.0021 g/mg min. The adsorption data gave good fit with Langmuir isotherm and yielded Langmuir monolayer isotherm uptake of 76.33 mg/g and adsorption equilibrium parameter of 0.022 L/mg at solution pH of 5.4–5.7 and temperature of 22–25 °C. During desorption studies 97–100%of adsorbed copper ion released in solution in presence of 1N strength of mineral acids HCl, H₂SO₄ and HNO₃. Dynamic study shows that column breakthrough was achieved at 264 bed volume at initial Cu²⁺ of 25 mg/L. Further studies are recommended on regeneration and reuse of AFC coated silica gel after desorption of copper ion.