HPEI接枝改性PAN/GO-PAA静电纺纳米复合纤维膜对Au(Ⅲ)的吸附

以丙烯酸(AA)为单体,过氧化苯甲酰(BPO)为引发剂,通过原位聚合法,在氧化石墨烯(GO)表面包覆聚丙烯酸(PAA),得到GO-PAA纳米复合物.将GO-PAA纳米复合物分散在聚丙烯腈(PAN)基体中,利用静电纺丝技术得到PAN/GO-PAA静电纺纳米复合纤维膜.利用化学接枝反应在PAN/GO-PAA静电纺纳米复合纤维膜表面接枝超支化聚乙烯亚胺(HPEI),构筑HPEI-g-PAN/GO-PAA静电纺纳米复合纤维膜.研究了HPEI-g-PAN/GO-PAA静电纺纳米复合纤维膜对Au(Ⅲ)的吸附性能.结果表明:HPEI-g-PAN/GO-PAA静电纺纳米复合纤维膜对Au(Ⅲ)的最大吸附量为1 808.60 mg·g^－1,在吸附过程中,部分Au(Ⅲ)被还原为片状和不规则颗粒状的Au单质.在共存离子体系中,HPEI-g-PAN/GO-PAA对Au(Ⅲ)具有较好的吸附选择性.

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

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.