| 聚丙烯酸改性凹土对Pb2+、Ni2+和Cr3+的选择性吸附 |
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| 引用本文： | 周守勇,薛爱莲,张艳,王启伟,李梅生,褚效中,赵宜江,邢卫红. 聚丙烯酸改性凹土对Pb2+、Ni2+和Cr3+的选择性吸附[J]. 化工学报, 2015, 66(2): 618-625. DOI: 10.11949/j.issn.0438-1157.20141244 |
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| 作者姓名： | 周守勇 薛爱莲 张艳 王启伟 李梅生 褚效中 赵宜江 邢卫红 |
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| 作者单位： | 1.淮阴师范学院化学化工学院, 淮安市新型环境功能材料重点实验室, 江苏省低维材料化学重点建设实验室, 江苏 淮安 223300;2.南京工业大学化学化工学院, 材料化学工程国家重点实验室, 江苏 南京 210009 |
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| 基金项目： | 国家自然科学基金项目(21276101)；江苏省科技支撑计划(工业)项目(BE2013080)；中科院盱眙凹土中心开放课题项目(20121005)；江苏省高校“青蓝工程”资助项目；江苏省六大人才高峰项目。 |
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| 摘 要： | 通过凹土的表面功能化开发高性能低成本的吸附材料,采用溶液聚合法在其表面接枝聚丙烯酸,制备出聚丙烯酸/凹土吸附材料(PAA/ATP),系统考察了PAA/ATP对Pb2+、Ni2+和Cr3+三元混合体系的吸附性能。结果表明:PAA/ATP复合吸附材料的有机物接枝率为14.1%,其结构中出现聚丙烯酸的特征官能团;PAA/ATP吸附Pb2+的动力学符合拟二级动力学,即化学吸附是速率控制步骤,说明PAA/ATP对Pb2+的吸附是一个有化学作用的过程,吸附过程与Pb2+和吸附剂PAA/ATP表面官能团之间的电子转移或电子共用有关;PAA/ATP对Pb2+的吸附符合Langmuir吸附等温模型;PAA/ATP对Pb2+、Ni2+和Cr3+的竞争吸附能力依次为Pb2+ > Cr3+ > Ni2+,即对Pb2+具有较好的选择性吸附。
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| 关 键 词： | 凹土 聚丙烯酸 重金属离子 吸附 选择性 热力学 动力学 |
| 收稿时间： | 2014-08-18 |
| 修稿时间： | 2014-10-22 |
Selective adsorption of Pb2+, Ni2+and Cr3+by polyacrylic acid/attapulgite composite adsorbents |
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| ZHOU Shouyong,XUE Ailian,ZHANG Yan,WANG Qiwei,LI Meisheng,CHU Xiaozhong,ZHAO Yijiang,XING Weihong. Selective adsorption of Pb2+, Ni2+and Cr3+by polyacrylic acid/attapulgite composite adsorbents[J]. Journal of Chemical Industry and Engineering(China), 2015, 66(2): 618-625. DOI: 10.11949/j.issn.0438-1157.20141244 |
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| Authors: | ZHOU Shouyong XUE Ailian ZHANG Yan WANG Qiwei LI Meisheng CHU Xiaozhong ZHAO Yijiang XING Weihong |
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| Affiliation: | 1.Huaian Key Laboratory of Advanced Environment Functional Materials, Key Laboratory for Chemistry of Low-Dimensional Materials of Jiangsu Province, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an 223300, Jiangsu, China;2.State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China |
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| Abstract: | Attapulgite (ATP) is a hydrous layer-ribbon magnesium aluminum silicate mineral with a unique three-dimensional structure. Due to its natural abundance, extremely good mechanical/thermal stability, its one-dimensional nanoscale, and a large quantity of silanol groups on the surface, attapulgite is a very good candidate for low-cost materials as adsorbents. To increase adsorption capacity and selectivity, attapulgite must be treated with organo-functional groups to produce specific sites on the surface. Polyacrylic acid/attapulgite (PAA/ATP) was prepared by grafting PAA onto γ-methacryloxypropyl trimethoxy silane (MPS)-modified attapulgite surface via solution polymerization. PAA/ATP was characterized by thermogravimetry (TG) and X-ray photoelectron spectroscopy (XPS). The selective adsorption of ternary mixed heavy metal ions (Pb2+, Ni2+ and Cr3+) by polyacrylic acid/attapulgite composite adsorbents was evaluated in batch experiments by varying contact time and initial ion concentration. The kinetic data was fitted with the pseudo-second-order kinetic model, and the equilibrium data obtained was analyzed with the Langmuir and Freundlich isotherm equations. The kinetic data followed pseudo-second-order equation, indicating the chemical adsorption was the rate-limiting step process. The equilibrium adsorption data of Pb2+ could be described well with the Langmuir isotherm model. Obviously, PAA/ATP showed excellent adsorption selectivity for Pb2+ compared with Ni2+ and Cr3+ in terms of distribution coefficient and separation factor, which was also confirmed by XPS. |
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| Keywords: | attapulgite polyacrylic acid heavy metal ions adsorption selectivity thermodynamics kinetics |
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