Benignly-fabricated crosslinked polyethylenimine/calcium-alginate fibers as high-performance adsorbents for effective recovery of gold

被引：86

作者：

Bediako, John Kwame ^{[1
,2
]}

Lin, Shuo ^{[1
]}

Sarkar, Amit Kumar ^{[1
]}

Zhao, Yufeng ^{[1
]}

Choi, Jong-Won ^{[1
]}

Song, Myung-Hee ^{[1
]}

Wei, Wei ^{[1
,3
]}

Reddy, D. Harikishore Kumar ^{[1
]}

Cho, Chul-Woong ^{[1
,4
]}

Yun, Yeoung-Sang ^{[1
]}

机构：

[1] Chonbuk Natl Univ, Div Semicond & Chem Engn, Jeonju 561756, Jeonbuk, South Korea

[2] Hongik Univ, Res Inst Sci & Technol HiRIST, Seoul, South Korea

[3] Xinyang Normal Univ, Sch Geog Sci, Nanhu Rd 237, Xinyang 464000, Peoples R China

[4] Chonnam Natl Univ, Dept Bioenergy Sci & Technol, Gwangju, South Korea

来源：

JOURNAL OF CLEANER PRODUCTION | 2020年 / 252卷

基金：

新加坡国家研究基金会;

关键词：

Polyethylenimine; Alginate; Fiber-type adsorbent; Electrostatic interaction; Gold recovery; SELECTIVE ADSORPTION; MODIFIED CELLULOSE; SUGARCANE BAGASSE; AQUEOUS-SOLUTIONS; METHYLENE-BLUE; HEAVY-METALS; BIOSORPTION; REMOVAL; AU(III); IONS;

D O I：

10.1016/j.jclepro.2019.119389

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

High-capacity crosslinked polyethylenimine (PEI)/Ca2+-Alginate fibers were fabricated as fast-kinetics adsorbents for application in gold recovery from urban mines. The benign protocols include strategic blending of PEI and alginate and extrusion into a mixture of CaCl2 and glutaraldehyde (GA) for simultaneous ionotropic gelation between the alginate and calcium ions, followed by chemical fixation of PEI into the Ca2+-Alginate matrix. Adsorption evaluation of the fabricated fibers showed remarkable gold uptakes surpassing 2300 and 1400 mg/g. The gold binding mechanisms were studied and elucidated with the aids of XRD and XPS as involving sequential electrostatic interaction and reduction by the amine, hydroxyl and aldehyde groups. The adsorption process was controlled by intra-particle diffusion mid-way towards equilibrium. The fibers were regenerated through adsorption-desorption cycles using 0.5 M thiourea/1 M HCl. The fibers demonstrated strong competiveness to existing adsorbents and have shown potentials for application as efficient adsorbents for recovery of gold from acidic solutions. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：14

共 61 条

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