Preparation of black-pearl reduced graphene oxide-sodium alginate hydrogel microspheres for adsorbing organic pollutants

Jiejie Feng; Hao Ding; Guang Yang; Ruiting Wang; Shuguan Li; Jianing Liao; Zengyuan Li; Daimei Chen

doi:10.1016/j.jcis.2017.07.113

Preparation of black-pearl reduced graphene oxide-sodium alginate hydrogel microspheres for adsorbing organic pollutants

J Colloid Interface Sci. 2017 Dec 15:508:387-395. doi: 10.1016/j.jcis.2017.07.113. Epub 2017 Jul 31.

Authors

Jiejie Feng¹, Hao Ding², Guang Yang¹, Ruiting Wang¹, Shuguan Li¹, Jianing Liao¹, Zengyuan Li¹, Daimei Chen³

Affiliations

¹ Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Xueyuan Road, Haidian, Beijing 100083, PR China.
² Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Xueyuan Road, Haidian, Beijing 100083, PR China. Electronic address: dinghao113@126.com.
³ Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Xueyuan Road, Haidian, Beijing 100083, PR China. Electronic address: chendaimei@cugb.edu.cn.

PMID: 28843928
DOI: 10.1016/j.jcis.2017.07.113

Abstract

The black-pearl reduced graphene oxide-sodium alginate (rGO-SA) hydrogel microspheres are prepared by the external emulsification and thermal reduction method, which are characterized by scanning electron microscope (SEM) and X-ray Diffraction (XRD). Sodium alginate (SA) serves as a template to form a 3D porous network structure, which can prevent the agglomeration and restacking of rGO sheets efficiently. The size of hydrogel microsphere can be controlled by adjusting the size of the liquid drop. The effects of rGO content (wt%), contact time, initial concentration of phenol, adsorption temperature and adsorption dose on the adsorption capacity of rGO-SA microspheres are investigated. The kinetics and isotherm data are well described by the pseudo-second-order kinetic model and the Langmuir equation, respectively. Thermodynamic results demonstrate the spontaneous and endothermic nature of adsorption. This rGO-SA microsphere exhibits the favorable adsorption performance for phenol, BPA and tetracycline. The rGO-SA microsphere might be a potential candidate for efficient adsorbents in water treatment.

Keywords: Adsorption capacity; Hydrogel microsphere; Reduced rGO oxide; Sodium alginate.