In-situ synthesis of carbon dot at cellulose nanofiber for durable water treatment membrane with high selectivity. (1st March 2021)

• Record Type: Journal Article
• Authors: Ahn, Jungbin; Pak, Sewon; Song, Younghan; Kim, Hyungsup
• Is Part Of: Carbohydrate polymers. Volume 255(2021)
• Publication Date: 2021-03-01
• Subjects: Carbon dot (CD) -- In-situ synthesis -- CD@CNF membrane -- Morphological durability -- Water treatment; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.117387
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Carbon dot (CD) was in-situ synthesized at the surface of cellulose nanofibers (CNF). The CD anchored to the CNF via amide bonding and increased the interactions of CNFs. The CD@CNF film showed outstanding morphological durability in aqueous solutions. The CD on the surface increased the pure water flux of the CD@CNF membrane. The CD@CNF membrane showed selective cationic dye removal and reusability. Abstract: In this work, carbon dot (CD) was in-situ synthesized and attached to cellulose nanofiber (CNF) via hydrothermal process. The in-situ synthesized CD uniformly enveloped the CNF surface by means of amide bonding, without significant changes of the chemical structure of CNF. The prepared CD@CNF composite showed rough and bumpy morphology. The attached CD increased the interaction between the fibers and enhanced the thermal stability and the dimensional stability in aqueous solution. CD@CNF showed excellent performance as a dye-rejection membrane with high-water flux (∼32 LMH bar −1 ) and high rejection rate (∼99.8 %), as well as the selective removal of cationic dye. This study suggests a novel synthesizing method of durable CNF membrane by envelopment of CD for effective water treatment.