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Carbohydr Polym. 2018 Sep 1;195:136-142. doi: 10.1016/j.carbpol.2018.04.081. Epub 2018 Apr 22.

Carboxymethlyated cellulose nanofibrils(CMCNFs) embedded in polyurethane foam as a modular adsorbent of heavy metal ions.

Author information

1
Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, Republic of Korea.
2
Institute of Advanced Composite Materials, Korea Institute of Science and Technology, 92 Chudong ro, Bondong-eup, Wanju-gun, Jeonbuk, 565-905, Republic of Korea.
3
Seoul Centre, Korea Basic Science Institute, Seoul, 02841, Republic of Korea.
4
Institute of Advanced Composite Materials, Korea Institute of Science and Technology, 92 Chudong ro, Bondong-eup, Wanju-gun, Jeonbuk, 565-905, Republic of Korea. Electronic address: jeonghs98@kist.re.kr.
5
Global Technology, SK Innovation, 325, Exporo, Yuseong-gu, Daejeon, 34124, Republic of Korea. Electronic address: azopark@gmail.com.

Abstract

Polyurethane (PU) foam was utilized as an efficient and durable template to immobilize surface-functionalized nanocellulose, carboxymethylated cellulose nanofibrils (CMCNFs), to address some of the challenges for the application of nanocellulose to industrial water purification, such as its agglomeration, difficulties in separation from effluent, and regeneration. The composite foams exhibited well dispersed CMCNFs in PU matrices with open pore structure; the hydrogen bonds result in the enhancement of mechanical strength, which is another requirement of ideal adsorbents for wastewater treatment. The composite foams show high adsorption capacity and the potential for recyclability. The combination of optimal surface modification of nanocellulose with isolation and immobilization in durable PU foam achieved an efficient and cost-competitive bio-sorbent for heavy metal ions.

KEYWORDS:

Carboxymethylated cellulose nanofibril; Metal ion adsorption; Modular adsorbent; Waterborne polyurethane

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