Removal of Pb²⁺ from water environment using a novel magnetic chitosan/graphene oxide imprinted Pb²⁺

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• 作者：Yanhui Wang^a ; LeiLei Li^b ; Chuannan Luo^a ; ^{haoyunlileilei@163.com" class="auth_mail" title="E-mail the corresponding author} ; Xiaojiao Wang^a ; Huimin Duan^a
• 关键词：Magnetic chitosan ; Graphene oxide ; Langmuir ; Adsorption ; Pb2+
• 刊名：International Journal of Biological Macromolecules
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：86
• 期：Complete
• 页码：505-511
• 全文大小：1609 K

文摘

A novel, magnetic chitosan coating on the surface of graphene oxide was (Pb-MCGO) successfully synthesized using Pb²⁺ as imprinted ions for adsorption and removal of Pb²⁺ from aqueous solutions. The magnetic composite bioadsorbent was characterized by SEM, FTIR and XRD measurements. Batch adsorption experiments were performed to evaluate the adsorption conditions, selectivity and reusability. The results showed that the maximum adsorption capacity was 79 mg/g, observed at pH 5 and 303 K. Equilibrium adsorption was achieved within 40 min. The kinetic data could be fitted with a pseudo-second order equation. Adsorption process could be well described by Langmuir adsorption isotherms. The selectivity coefficient of Pb²⁺ and other metal cations onto Pb-MCGO indicated an overall preference for Pb²⁺, which was much higher than non-imprinted MCGO beads. Moreover, the sorbent was stable and easily recovered, the adsorption capacity was about 90% of the initial saturation adsorption capacity after being used five times.