Preparation of acrylamide/acrylic acid cellulose hydrogels for the adsorption of heavy metal ions

Binchan Zhao; Huabin Jiang; Zongkun Lin; Shaofan Xu; Jun Xie; Aiping Zhang

doi:10.1016/j.carbpol.2019.115022

Preparation of acrylamide/acrylic acid cellulose hydrogels for the adsorption of heavy metal ions

Carbohydr Polym. 2019 Nov 15:224:115022. doi: 10.1016/j.carbpol.2019.115022. Epub 2019 Jul 5.

Authors

Binchan Zhao¹, Huabin Jiang¹, Zongkun Lin¹, Shaofan Xu¹, Jun Xie¹, Aiping Zhang²

Affiliations

¹ College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, PR China.
² College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China. Electronic address: aiping@scau.edu.cn.

PMID: 31472847
DOI: 10.1016/j.carbpol.2019.115022

Abstract

Modified cellulose hydrogels were prepared by blending and cross-linking with acrylamide and acrylic acid. The structure of hydrogels was characterized and analyzed with fourier transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Under the optimized conditions, the maximum absorption capacity in modified cellulose hydrogels of Cu (II), Pb (II) and Cd (II) ions were 157.51, 393.28 and 289.97 mg/g, respectively. In addition, the metal ion adsorption process accorded with pseudo-second-order rate equation and Langmuir adsorption isotherm. Based on the microstructure analysis and adsorption kinetics, the adsorption mechanisms such as physical, chemical, and electrostatic interactions are discussed. The adsorption process was controlled by the ion-exchange mechanism.

Keywords: Adsorption isotherm; Adsorption kinetics; Heavy metal ions; Modified cellulose hydrogels.