| 壳聚糖/聚乙二醇/丙烯酸吸附剂对Cu2+、Co2+和Ni2+的吸附选择性和重复利用性 |
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| 引用本文： | 俞洁,郑继东,陆泉芳,杨恕修,王星,张晓敏.壳聚糖/聚乙二醇/丙烯酸吸附剂对Cu2+、Co2+和Ni2+的吸附选择性和重复利用性[J].环境科学学报,2017,37(3):1003-1012. |
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| 作者姓名： | 俞洁 郑继东 陆泉芳 杨恕修 王星 张晓敏 |
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| 作者单位： | 甘肃省生物电化学与环境分析重点实验室, 西北师范大学化学化工学院, 兰州 730070,甘肃省生物电化学与环境分析重点实验室, 西北师范大学化学化工学院, 兰州 730070,1. 甘肃省生物电化学与环境分析重点实验室, 西北师范大学化学化工学院, 兰州 730070;2. 西北师范大学学报编辑部, 兰州 730070,甘肃省生物电化学与环境分析重点实验室, 西北师范大学化学化工学院, 兰州 730070,甘肃省生物电化学与环境分析重点实验室, 西北师范大学化学化工学院, 兰州 730070,甘肃省生物电化学与环境分析重点实验室, 西北师范大学化学化工学院, 兰州 730070 |
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| 基金项目： | 国家自然科学基金资助项目（No.21367023，21567025） |
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| 摘 要： | 采用扫描电镜(SEM)和红外光谱(FT-IR)对辉光放电电解等离子体(GDEP)技术引发制备的壳聚糖/聚乙二醇/丙烯酸(CS/PEG/AA)聚合物吸附剂的形貌和结构进行了表征.研究了该吸附剂对Cu~(2+)、Co~(2+)和Ni~(2+)的吸附选择性、重复利用性和解吸动力学行为,同时结合X射线光电子能谱(XPS)探讨了可能的吸附机理.结果表明,CS、PEG和AA发生接枝共聚形成聚合物,其表面呈现疏松、多孔的三维网络结构;吸附最佳pH为4.8;在含有Cu~(2+)、Co~(2+)和Ni~(2+)的混合溶液中,CS/PEG/AA对Cu~(2+)有较好的吸附选择性;在EDTA-4Na洗脱液中CS/PEG/AA具有优异的再生和重复利用性,解吸动力学符合解吸准二级模型;Cu~(2+)在CS/PEG/AA上的吸附是由离子交换、配位螯合等共同作用的复杂的物理化学过程.
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| 关 键 词： | 壳聚糖(CS) 吸附剂 重金属离子 吸附选择性 重复利用性 吸附机理 |
| 收稿时间： | 2016/5/30 0:00:00 |
| 修稿时间： | 2016/6/27 0:00:00 |
Adsorption selectivity and reusability of chitosan/poly(ethylene glycol)/acrylic acid adsorbent for Cu2+, Co2+ and Ni2+ |
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| YU Jie,ZHENG Jidong,LU Quanfang,YANG Shuxiu,WANG Xing and ZHANG Xiaomin.Adsorption selectivity and reusability of chitosan/poly(ethylene glycol)/acrylic acid adsorbent for Cu2+, Co2+ and Ni2+[J].Acta Scientiae Circumstantiae,2017,37(3):1003-1012. |
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| Authors: | YU Jie ZHENG Jidong LU Quanfang YANG Shuxiu WANG Xing and ZHANG Xiaomin |
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| Institution: | Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070,Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070,1. Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070;2. Editorial Department of the University Journal, Northwest Normal University, Lanzhou 730070,Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070,Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070 and Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070 |
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| Abstract: | The chitosan/poly(ethylene glycol)/acrylic acid (CS/PEG/AA) adsorbent was prepared using glow-discharge electrolysis plasma technique, and then characterized by SEM and FT-IR.The adsorption selectivity and reusability of adsorbent for Cu2+, Co2+ and Ni2+ were investigated in detail. In addition, the adsorption mechanism was also studied by using FT-IR and XPS. The results show that PEG and AA have been successfully grafted on CS. The adsorbent exhibits porous surface with three-dimensional network structure. The optimal pH for the removal of heavy metal ions is 4.8. The CS/PEG/AA has good adsorption selectivity for Cu2+ with the coexistence of Co2+ and Ni2+. The desorption behavior of CS/PEG/AA for Cu2+, Co2+ and Ni2+ in EDTA-4Na solution follows pseudo-second-order model. The adsorption of Cu2+ by CS/PEG/AA is a complex physical-chemical process due to coordination between N atoms and Cu2+, ion-exchange between Na+ and Cu2+. |
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| Keywords: | chitosan (CS) adsorbent heavy metal ions selective adsorption reusability adsorption mechanism |
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