Modified tunicate nanocellulose liquid crystalline fiber as closed loop for recycling platinum-group metals

Title
Modified tunicate nanocellulose liquid crystalline fiber as closed loop for recycling platinum-group metals
Authors
황준연김승민정현수홍승기유하영홍혜진박민상
Keywords
Platinum group metal (PGM); Recycle; Nanocellulose; Liquid crystal; Catalyst; Closed loop
Issue Date
2020-01
Publisher
Carbohydrate polymers
Citation
VOL 228, 115424
Abstract
Rising demand and elemental rarity requires the recycling of precious metals such as platinum group elements (PGMs). Recently, biosorption has been focused on the capability of recovering precious metals, but in practice, recycling is inefficient or far away from a closed-loop material system. Here we use a polyethylenimine (PEI)-grafted spun-fiber made of cellulose nanofibril (CNF) extracted from a tunicate as a biosorbent for PGMs. Liquid crystallinity (LC) of TCNF suspension appears to contribute the generation of well-developed open porous structure in the fiber. We show the fiber has the selectivity and high capacity of Pt (120.2  mg/g, 86%) and Pd (26.5  mg/g, 74.2%) adsorption under the presence of other metals in simulated automobile waste. The adsorbed Pt and Pd with nano-scale clusters were uniformly distributed on the porous surface, which were directly applied as a catalyst. These results propose an easy approach to recover precious metals and reuse them directly, thereby closing loops of metal recycling.
URI
http://pubs.kist.re.kr/handle/201004/70999
ISSN
0144-8617
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KIST Publication > Article
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