Poly(acryloyl hydrazide)-grafted cellulose nanocrystal adsorbents with an excellent Cr(VI) adsorption capacity
- Authors
- Park, Sang-Hee; Shin, Seung Su; Park, Chan Hyung; Jeon, Sungkwon; Gwon, Jaegyoung; Lee, Sun-Young; Kim, Sung-Jun; Kim, Hyung-Ju; Lee, Jung-Hyun
- Issue Date
- 15-7월-2020
- Publisher
- ELSEVIER
- Keywords
- Cellulose nanocrystal; Atom transfer radical polymerization; Adsorbents; Cr(VI) removal
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.394
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 394
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/54383
- DOI
- 10.1016/j.jhazmat.2020.122512
- ISSN
- 0304-3894
- Abstract
- In this study, we prepared poly(acryloyl hydrazide) (PAH)-grafted cellulose nanocrystal (CNC-PAH) particles via the atom transfer radical polymerization method for application to Cr(VI) adsorption. The closely-packed PAH chains grafted on the cellulose nanocrystal (CNC) surface provide a high density of amine groups that can adsorb Cr(VI) through strong electrostatic, hydrogen bonding and chelating interactions. CNC-PAH exhibited the optimum Cr(VI) adsorption capacity at the solution pH = 3, where its electrostatic attraction with Cr(VI) was maximized. Cr(VI) was chemisorbed in CNC-PAH by following the Langmuir isotherm mechanism (homogeneous monolayer adsorption). The Cr(VI) adsorption kinetics of CNC-PAH was controlled predominantly by intra-particle diffusion resistance imparted by the PAH shell layer. Thermodynamic analysis revealed that Cr(VI) adsorption of CNC-PAH is a spontaneous and endothermic process. Importantly, CNC-PAH grafted with the higher M-w( similar to 50 kg mol(-1)) PAH exhibited a rapid Cr(VI) adsorption rate and remarkably high Cr(VI) adsorption capacity (similar to 457.6 mg g(-1) at 298.15 K), exceeding those of previously reported adsorbents owing to its numerous Cr(VI)-adsorptive amine groups provided by the closely-packed grafted PAH polymers. Furthermore, CNC-PAH showed excellent reusability to maintain its high adsorption ability during repeated adsorption-desorption cycles owing to the covalently binding nature of the PAH polymers.
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