HPEI graft modification PAN/GO-PAA electrospun nanocomposite fibrous membranes for adsorption of Au(Ⅲ)

Abstract

Abstract: Using acrylic acid (AA) as monomer and benzoyl peroxide (BPO) as initiator, polyacrylic acid (PAA) was coated on the surface of graphene oxide (GO) by in-situ polymerization to obtain GO-PAA nanocomposites. The GO-PAA nanocomposites were dispersed in polyacrylonitrile (PAN) matrix, and PAN/GO-PAA electrospun nanocomposite fibrous membranes were obtained by electrospinning technology. HPEI-g-PAN/GO-PAA electrospun nanocomposite fibrous membranes were fabricated by grafting hyperbranched polyethyleneimine (HPEI) on the surface of PAN/GO-PAA electrospun nanocomposite fibrous membranes with chemical grafting reaction. The adsorption performance of HPEI-g-PAN/GO-PAA electrospun nanocomposite fibrous membranes for Au(Ⅲ) was studied by batch experiments. The results showed that the maximum adsorption capacity of HPEI-g-PAN/GO-PAA electrospun nanocomposite fibrous membranes for Au(Ⅲ) was 1 808.60 mg·g^－1. During the adsorption process, partial Au(Ⅲ) was reduced to flake and irregularly granular Au elemental. HPEI-g-PAN/GO-PAA electrospun nanocomposite fibrous membranes had good adsorption selectivity for Au(Ⅲ) in the coexisting ionic system.

Key words: hyperbranched polyethyleneimine, polyacrylonitrile, electrospun nanocomposite fibrous membranes, adsorption, Au(Ⅲ)

CLC Number:

TB383.2

LI Xiao-hua, MA Ying-xia, YANG Hai-jun, MENG Wen-li, ZHONG Xiao-mei. HPEI graft modification PAN/GO-PAA electrospun nanocomposite fibrous membranes for adsorption of Au(Ⅲ)[J]. Journal of Lanzhou University of Technology, 2022, 48(6): 16-27.

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