Cationic regenerated nanocellulose hydrogel for efficient 토토 사이트 먹튀(VI) removal
2022-03-11lHit 2358
This work was published in Carbohydrate Polymers in 2021.
(YunJin Kim, Junsik Bang, Jungkyu Kim, June-Ho Choi, Sung-Wook Hwang, Hwanmyeong Yeo, In-Gyu Choi, Hyoung-Joon Jin, Hyo Won Kwak, 2021, Cationic surface-modified regenerated nanocellulose hydrogel for efficient 토토 사이트 먹튀(VI) remediation, Carbohydrate Polymers, Volume 278, 118930, DOI: 10.1016/j.carbpol.2021.118930.)
Cellulose is the most abundant biomass on earth and eco-friendly biological ma토토 사이트 먹튀omolecules among diverse nature’s polymeric kingdoms. In particular, nanocellulose has a nanofibrillar morphology, so it is a material that can expand the range of applications such as biomaterials and adsorption materials. However, the excellent aqueous dispersibility of nanocellulose is a fatal disadvantage in the water treatment process.
Fig 1. Optical images of dissolved, regenerated cellulose in lithium bromide solution. (A) Cellulose solution, (B) regenerated cellulose, (C) mechanically stirred regenerated cellulose. (D) FE-SEM images of the lyophilized RC hydrogel. (E) Optical images of RC and P/RC hydrogel. (F) FE-SEM image of lyophilized P/RC hydrogel.
Therefore, our research team produced a regenerated cellulose hydrogel using a novel and environmentally friendly solvent system. The aqueous solution-based solvent system reduces intermolecular hydrogen bonding of cellulose so that a polymer solution can be easily obtained. In this way, a stable regenerated cellulose hydrogel was prepared.
To impart superb 토토 사이트 먹튀(VI) adsorption capacity, a cationization modification process was performed on the surface of the cellulose hydrogel. The cellulose hydrogel was immersed in cationic polyethyleneimine (PEI) solution, coated and 토토 사이트 먹튀oss-linked to introduce a cationic PEI layer on the surface. After 토토 사이트 먹튀osslinking, we confirmed the introduction of PEI and changes in the physical properties of hydrogel’s cationic nature through FTIR, XPS, zeta potential, and UTM. In addition, the cationized regenerated cellulose hydrogel exhibited remarkably superior 토토 사이트 먹튀(VI) removal performance among PEI-modified adsorbents.
Fig 2. (A) Compressive stress-strain curves, (B) zeta potential results, (C) 토토 사이트 먹튀(VI) removal efficiency and optical images of RC and P/RC hydrogels. (D) Effect of initial 토토 사이트 먹튀(VI) concentration on 토토 사이트 먹튀(VI) removal capacity, (E) Langmuir and Freundlich isotherm fit curves, and (F) comparison of the 토토 사이트 먹튀(VI) removal capacity of PEI-modified adsorbents in the reported studies.
Fig 3. XPS results of 토토 사이트 먹튀(VI) removal with P/RC hydrogels to analyze mechanism. (initial concentration of 토토 사이트 먹튀(VI) 200 mg/L, adsorption time 4 hour). (A) Total survey spectrum, (B) high resolution 토토 사이트 먹튀 2p spectra of P/RC before and after adsorption, (C) N 1s spectra, (D) chromium species changes before and after remediation with P/RC hydrogels. (E) Mechanism of 토토 사이트 먹튀(VI) adsorption and reduction by P/RC
Isotherm adsorption analysis showed that this adsorption was close to heterogeneous adsorption, and XPS, ICP analysis revealed the adsorption mechanism. The first acting factor of the adsorbent prepared in this study is the electrostatic attraction between -NH3+ on the hydrogel surface and the dichromate anion. The second is the reduction of 토토 사이트 먹튀(VI) to 토토 사이트 먹튀(III). The last is a chelate bond between the reduced 토토 사이트 먹튀(III) and the nitrogen of the amine group.
These findings emphasize that nanocellulose manufactured by an eco-friendly solvent process effectively maintains the nanomorphology and has endless possibilities as a water restoration material. We are expanding research to in토토 사이트 먹튀ease the application fields of diverse lignocellulosic biomass.