Carboxymethyl cellulose/polyacrylamide composite hydrogel for cascaded treatment/reuse of heavy metal ions in wastewater

Chirag B Godiya; Xiao Cheng; Dawei Li; Zhan Chen; Xiaolin Lu

doi:10.1016/j.jhazmat.2018.09.076

Carboxymethyl cellulose/polyacrylamide composite hydrogel for cascaded treatment/reuse of heavy metal ions in wastewater

J Hazard Mater. 2019 Feb 15:364:28-38. doi: 10.1016/j.jhazmat.2018.09.076. Epub 2018 Oct 6.

Authors

Chirag B Godiya¹, Xiao Cheng², Dawei Li³, Zhan Chen⁴, Xiaolin Lu⁵

Affiliations

¹ State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China. Electronic address: 101101507@seu.edu.cn.
² State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China. Electronic address: 213143021@seu.edu.cn.
³ State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. Electronic address: daweili@nju.edu.cn.
⁴ Department of Chemistry, University of Michigan, 930-North University Avenue, Ann-Arbor, MI 48109, United States. Electronic address: zhanc@umich.edu.
⁵ State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China. Electronic address: lxl@seu.edu.cn.

PMID: 30336333
DOI: 10.1016/j.jhazmat.2018.09.076

Abstract

A new bio-based bilateral hydrogel containing carboxymethyl cellulose (CMC) and polyacrylamide (PAM) was prepared for the wastewater remediation. The obtained CMC/PAM composite hydrogel reveals a strong single-ion affinity for copper (Cu^II), lead (Pb^II) and cadmium (Cd^II) ions, as well as multi-ion absorbability with its equilibrium data following the Langmuir adsorption model and its adsorption process abiding by a pseudo-second-order kinetics. To demonstrate its recycled use for the metal ions, the adsorbed Cu^II ions in the hydrogel were reduced in situ to form homogeneously dispersed Cu nanoparticles (NPs), leading to the Cu NPs-loaded CMC/PAM hydrogel. Reduction of 4-nitrophenol to 4-aminophenol with high efficiency was successfully achieved by this Cu NPs-loaded CMC/PAM hydrogel, verifying the hydrogel's dual functionalities towards the wastewater treatment and catalytic application.

Keywords: Adsorption; Catalysis; Heavy metal ions; Kinetic model; Porous hydrogel.

Publication types

Research Support, Non-U.S. Gov't