Mechanistic study of selective adsorption and reduction of Au (III) to gold nanoparticles by ion-imprinted porous alginate microspheres
2019; Elsevier BV; Volume: 385; Linguagem: Inglês
10.1016/j.cej.2019.123897
ISSN1873-3212
AutoresXiangpeng Gao, Jun Liu, Mingyang Li, Cheng Guo, Hongming Long, Yan Zhang, Lili Xin,
Tópico(s)Nanomaterials for catalytic reactions
ResumoIn this paper, a novel technique combining ion-imprinting and direct templating was applied to synthesize Au (III) imprinted epicholorohydrin/thiourea modified porous alginate adsorbent. The adsorbent has demonstrated outstanding selectivity towards Au (III) from multi-metallic solutions, and the porous structure generated from urea hydrolysis has provided fast adsorption kinetics. The maximum uptake capacity of Au (III) is 184.82 mg/g at 323 K, which is outstanding as a recyclable polysaccharide-based adsorbent. Photo-reduction of Au (III) to gold particles was observed in the adsorption process under UV light exposure, while visible light is not capable of stimulating electrons from the synthesized adsorbent. FT-IR, XPS, and DFT calculation have proved that hydroxyl, carboxyl, and NCS functional groups were involved in the adsorption-photoreduction of Au (III).
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