Mussel-inspired preparation of layered double hydroxides based polymer composites for removal of copper ions

Jibo Dou; Qiang Huang; Hongye Huang; Defu Gan; Junyu Chen; Fengjie Deng; Yuanqing Wen; Xiaoli Zhu; Xiaoyong Zhang; Yen Wei

doi:10.1016/j.jcis.2018.08.064

Mussel-inspired preparation of layered double hydroxides based polymer composites for removal of copper ions

J Colloid Interface Sci. 2019 Jan 1:533:416-427. doi: 10.1016/j.jcis.2018.08.064. Epub 2018 Aug 25.

Authors

Jibo Dou¹, Qiang Huang², Hongye Huang², Defu Gan², Junyu Chen², Fengjie Deng², Yuanqing Wen², Xiaoli Zhu³, Xiaoyong Zhang⁴, Yen Wei⁵

Affiliations

¹ School of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China; Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
² Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
³ School of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China. Electronic address: xiaolizhu@nwu.edu.cn.
⁴ Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China. Electronic address: zhangxiaoyong@ncu.edu.cn.
⁵ Department of Chemistry and the Tsinghua Center for Frontier Polymer Research, Tsinghua University, Beijing 100084, China; Department of Chemistry and Center for Nanotechnology, Chung-Yuan Christian University, Chung-Li 32023, Taiwan. Electronic address: weiyen@tsinghua.edu.cn.

PMID: 30172152
DOI: 10.1016/j.jcis.2018.08.064

Abstract

A novel ternary composite consisting of Mg/Al layered double hydroxides (LDH), polydopamine (PDA) and poly(methyl vinyl ether-alt-maleic anhydride) (PMVE-MA) was fabricated by a facile combination of mussel-inspired chemistry and a ring-opening reaction. Dopamine can serve as a "minimalist mimic" of mussel adhesive protein to form a layer of polydopamine (PDA) on the LDH surface under rather mild conditions (including air atmosphere, aqueous solution, and catalyst free). Subsequently, the PMVE-MA brushes were immobilized onto the PDA modified LDH via a ring-opening reaction. The morphology and chemical compositions of the as-prepared samples were characterized by SEM, TEM, FT-IR, TGA, and XPS. To evaluate the adsorption performance of the PMVE-MA modified LDH (LDH@PDA@PMVE-MA) composites, the obtained samples were used as adsorbents for the removal of copper ions (Cu²⁺) from an aqueous solution. The results demonstrated that the LDH@PDA@PMVE-MA composites showed a significant improvement in the adsorption efficiency towards Cu²⁺, and the adsorption capacity of the LDH@PDA@PMVE-MA composites was found to be 2 times higher than that of pristine LDH. Adsorption kinetics showed that the experimental data were fitted well by the pseudo-second-order kinetic model. Equilibrium data could be best described by the Langmuir isotherm model, with the maximum monolayer adsorption capacity of 193.78 mg/g. Thermodynamic studies indicated that the adsorption of Cu²⁺ onto the LDH@PDA@PMVE-MA composites is an endothermic and spontaneous process. Importantly, it can be easily regenerated by low-cost reagents, and exhibited high removal efficiencies after four cycles of adsorption-desorption. These results suggest that the LDH@PDA@PMVE-MA nanocomposites are good candidate for Cu²⁺ removal from aqueous solutions.

Keywords: Anhydride; Layered double hydroxide; Mussel-inspired polymerization; Polydopamine; Surface modification.