双功能化磁性纳米修复剂对多重金属的快速、高效钝化行为  

Fast and Efficient Immobilization Behavior of Bifunctional Magnetic Nano-Amendment Against Multi-heavy Metal

作　　者：梁静 韩露 李宝 时珍珠 刘星驰 彭李超[1,5] 邹雪艳[1,4,5] LIANG Jing;HAN Lu;LI Bao;SHI Zhen-Zhu;LIU Xing-Chi;PENG Li-Chao;ZOU Xue-Yan(Engineering Research Center for Nanomaterials,Henan University,Kaifeng,Henan 475004,China;School of Pharmacy,Henan University,Kaifeng,Henan 475004,China;College of Chemistry and Chemical Engineering,Henan University,Kaifeng,Henan 475004,China;State Key Laboratory of Cotton Biology,Henan University,Kaifeng,Henan 475004,China;Collaborative Innovation Center of Nano Functional Materials and Applications of Henan Province,Henan University,Kaifeng,Henan 475004,China)

机构地区：[1]河南大学纳米材料工程研究中心,开封475004 [2]河南大学药学院,开封475004 [3]河南大学化学化工学院,开封475004 [4]河南大学棉花生物学国家重点实验室,开封475004 [5]河南大学纳米功能材料及其应用河南省协同创新中心,开封475004

出　　处：《无机化学学报》2021年第11期1981-1990,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家重点研发计划(No.2018YFC1603002);中国博士后科学基金第69批面上资助(No.2021M690913);河南省高等学校重点科研项目(No.21A150012);河南大学2020年度大学生创新创业训练计划项目(No.2020101511,2020102008,2020101503,2020101505)资助。

摘　　要：采用“一锅法”制备了四氧化三铁/半胱氨酸(Fe_(3)O_(4)/Cys)磁性纳米微球,随后对Fe_(3)O_(4)/Cys进行亚氨基二乙酸(IDA)修饰得到Fe_(3)O_(4)/Cys/IDA磁性双功能化纳米微球。研究发现Fe_(3)O_(4)/Cys中的L-Cys是通过—SH基团接枝到Fe_(3)O_(4)表面的,随后IDA分子中的羧基与Fe_(3)O_(4)/Cys中的—NH_(2)形成酰胺键,最终形成多支链多羧基的Fe_(3)O_(4)/Cys/IDA磁性纳米修复剂。基于修复剂表面短支链-长支链交替的多羧基结构,实现了羧基基团的高密度接枝。同时,Fe_(3)O_(4)/Cys/IDA磁性纳米微球对Pb^(2+)、Cd^(2+)、Cu^(2+)、Co^(2+)、Ni^(2+)、Zn^(2+)为专性吸附,而对Hg^(2+)属于非专性吸附,且吸附重金属后得到的钝化产物均表现了良好的稳定性。另外,Fe_(3)O_(4)/Cys/IDA对重金属离子的吸附符合Langmuir模型,属于单层均相吸附,其吸附过程符合准二级动力学模型,最大吸附量为49.05 mg·g^(-1)。Ferroferric oxide/L-cysteine(Fe_(3)O_(4)/Cys)magnetic nanospheres were synthesized by one pot method.Sub-sequently,the obtained Fe_(3)O_(4)/Cys were further modified by conjugating iminodiacetic acid(IDA)to obtain Fe_(3)O_(4)/Cys/IDA nanospheres.It was indicated that L-Cys was grafted on the surface of Fe_(3)O_(4)by—SH group and Fe_(3)O_(4)/Cys/IDA,with more branched chains and more—COOH groups,was obtained by amido bond formed by the—NH_(2)group of Fe_(3)O_(4)/Cys and the—COOH group of IDA.Due to the alternative short and long chains grafting,Fe_(3)O_(4)/Cys/IDA nanospheres displayed high density modification of—COOH groups.Meanwhile,we found that the adsorption of Pb^(^(2+)),Cd^(^(2+)),Cu^(^(2+)),Co^(^(2+)),Ni^(^(2+)),Zn^(^(2+))ions by Fe_(3)O_(4)/Cys/IDA nanospheres were specific adsorption and that of Hg^(^(2+))ions was unspecific adsorption.And all the complexes(Fe_(3)O_(4)/Cys/IDA-M,M was the metal)obtained after immobiliza-tion exhibited good stability.Experimental equilibrium data were also analyzed by the Langmuir and Freundlich models,and the best fit was obtained with the Langmuir isotherm equation,which was monolayer homogeneous adsorption.The kinetic study indicated that the adsorption kinetic data was well described by the pseudo-second kinetic model and the maximum immobilization capacity was 49.05 mg·g^(-1),which was a fast and efficient heavy met-al immoblization material.

关 键 词：四氧化三铁 多羧基 重金属 接枝机理 动力学 热力学 

分 类 号：O614.81[理学—无机化学]