Absorption properties of Cd2+ ion imprinted poly(fulvic acid)

doi:10.11949/j.issn.0438-1157.20161156

Abstract

Abstract:

Cd²⁺ ion imprinted polymer (MFA-IIP) was synthesized by inverse suspension copolymerization of modified fulvic acid monomer. Adsorption study showed that adsorption kinetics of MFA-IIP to Cd²⁺ is in accordance with pseudo-second-order kinetic model with correlation coefficient of 0.9977. The adsorption of heavy metal ions on MFA-IIP polymer thermodynamically follows single-molecule surface Langmuir adsorption model. In presence of competitive Pb²⁺and Cr³⁺ ions, the polymer exhibited strong selection and recognition to template ion with relative selectivity coefficient of Cd²⁺/Pb²⁺ and Cd²⁺/Cr³⁺ at 4.32 and 13.47, respectively. When other metal ions with different valences existed in aqueous solution, selective recognition of MFA-IIP polymer to Cd²⁺ would be much more obvious.

Key words: ion imprinted, modified fulvic acid, adsorbents, kinetics, thermodynamics

摘要：

以改性黄腐酸为功能单体，反相悬浮聚合法制备了Cd²⁺离子印迹聚合物，并研究其吸附性能。动力学模型表明，黄腐酸基Cd²⁺离子印迹聚合物对Cd²⁺的吸附符合准二级动力学吸附模型，相关系数达到0.9977；热力学研究发现，黄腐酸基Cd²⁺离子印迹聚合物吸附重金属离子的形式为单分子层表面吸附，与Langmuir等温吸附模型相符；竞争吸附实验显示，竞争离子Pb²⁺、Cr³⁺存在时，Cd²⁺/Pb²⁺、Cd²⁺/Cr³⁺的相对选择性系数分别为4.32、13.47，说明MFA-IIP对模板离子拥有较强的选择识别性能，竞争离子化合价不同，选择识别性更加显著。

关键词: 离子印迹, 改性黄腐酸, 吸附剂, 动力学, 热力学

CLC Number:

TQ424.3

SHANG Hongzhou, ZHAO Jingdong, HE Junnan, SUN Xiaoran. Absorption properties of Cd²⁺ ion imprinted poly(fulvic acid)[J]. CIESC Journal, 2017, 68(5): 1940-1945.

尚宏周, 赵敬东, 何俊男, 孙晓然. 黄腐酸基Cd²⁺离子印迹聚合物的吸附性能测试[J]. 化工学报, 2017, 68(5): 1940-1945.

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Absorption properties of Cd²⁺ ion imprinted poly(fulvic acid)

黄腐酸基Cd²⁺离子印迹聚合物的吸附性能测试

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