CaCO3-coated PVA/BC-based composite for the simultaneous adsorption of Cu(II), Cd(II), Pb(II) in aqueous solution

Yu Zhang; Liang Zhang; Ruohui Gao; Lvling Zhong; Juanqin Xue

doi:10.1016/j.carbpol.2021.118227

CaCO₃-coated PVA/BC-based composite for the simultaneous adsorption of Cu(II), Cd(II), Pb(II) in aqueous solution

Carbohydr Polym. 2021 Sep 1:267:118227. doi: 10.1016/j.carbpol.2021.118227. Epub 2021 May 19.

Authors

Yu Zhang¹, Liang Zhang², Ruohui Gao¹, Lvling Zhong¹, Juanqin Xue¹

Affiliations

¹ School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China.
² School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China; Shanxi Provincial Key Laboratory of Gold and Resource, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China. Electronic address: zl98zl@hotmail.com.

PMID: 34119180
DOI: 10.1016/j.carbpol.2021.118227

Abstract

A polymer composite material comprising polyvinyl alcohol/bacterial cellulose/calcium carbonate (PVA/BC/CaCO₃) was prepared for enabling the selective adsorption of toxic heavy metal ions, such as Cd(II), Cu(II), and Pb(II) from solution. FT-IR, SEM and XRD analyses confirmed the successful incorporation of CaCO₃ into the PVA-based polymer by chemical cross-linking with epichlorohydrin. The optimal pH for adsorption of the metal ions onto PVA/BC/CaCO₃ was determined to be 6.0. The pseudo-first-order kinetics model was best-suited for fitting the adsorption kinetics data, and the Langmuir model was best-suited for fitting the thermodynamic adsorption data. The maximum adsorption capacities of PVA/BC/CaCO₃ for Cu(II), Pb(II), and Cd(II) were found to be 57.1, 513.6, and 238.6 mg/g, respectively, at 40 °C. In addition, the adsorbent was found to be highly recyclable. Overall, PVA/BC/CaCO₃ adsorbent has the applicable potential in the removal of heavy metal ions from contaminated solution.

Keywords: CaCO(3); Ion-exchange; PVA; Selective adsorption.