Selective adsorption of Pb2+, Ni2+ and Cr3+ by polyacrylic acid/attapulgite composite adsorbents

doi:10.11949/j.issn.0438-1157.20141244

CIESC Journal ›› 2015, Vol. 66 ›› Issue (2): 618-625.DOI: 10.11949/j.issn.0438-1157.20141244

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Selective adsorption of Pb²⁺, Ni²⁺ and Cr³⁺ by polyacrylic acid/attapulgite composite adsorbents

ZHOU Shouyong¹, XUE Ailian¹, ZHANG Yan¹, WANG Qiwei^1,2, LI Meisheng¹, CHU Xiaozhong¹, ZHAO Yijiang¹, XING Weihong²

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

Received:2014-08-18 Revised:2014-10-22 Online:2015-02-05 Published:2015-02-05
Supported by:
supported by the National Natural Science Foundation of China (21276101), the Jiangsu Province Science and Technology Support Program (BE2013080), the Open Project Program of R&D Center of Xuyi Palygorskite Applied Technology of Chinese Academy of Science (20121005) and the Jiangsu Qing Lan Project and the Six Projects Sponsoring Talent Summits of Jiangsu Province.

聚丙烯酸改性凹土对Pb²⁺、Ni²⁺和Cr³⁺的选择性吸附

周守勇¹, 薛爱莲¹, 张艳¹, 王启伟^1,2, 李梅生¹, 褚效中¹, 赵宜江¹, 邢卫红²

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

通讯作者: 赵宜江
基金资助:
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。

Abstract

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.

Key words: attapulgite, polyacrylic acid, heavy metal ions, adsorption, selectivity, thermodynamics, kinetics

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。

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

CLC Number:

TQ028
X505

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]. CIESC Journal, 2015, 66(2): 618-625.

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.

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Selective adsorption of Pb²⁺, Ni²⁺ and Cr³⁺ by polyacrylic acid/attapulgite composite adsorbents

聚丙烯酸改性凹土对Pb²⁺、Ni²⁺和Cr³⁺的选择性吸附

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