writer：Mei-Li Song, Hou-Yong Yu, Lu-Min Chen, Jiaying Zhu, Yan- Yan Wang, Juming Yao, Zhuanyong Zou, and Ka
keywords：Cellulose nanocrystals, Multi-branch, Carboxyl content, Adsorption performance, Flocculation performance
source：期刊
Issue time：2019年

A simple multi-branch strategy was employed to increase the carboxyl contents

on CNC surface. The effects of various sequential grafting of ascorbic acid or citric acid on

the morphology, microstructure, thermal stability, dye adsorption capability (methylene blue)

and coagulation–flocculation capacity (model Kaolin suspension) of the functionalized CNCs

were investigated. Cellulose nanocrystals with multi-carboxyl groups (CNC-g-AA-g-CA)

showed better thermal stability (Tmax=359.3oC), and possessed the highest carboxylic groups

of 4.073mmol/g, which led to a high absolute zeta potential value up to 47.7 mV.

Furthermore, the CNC-g-AA-g-CA exhibited excellent coagulation?flocculation capability to

kaolin suspension with a turbidity removal rate of 91.07% and good cationic dye (methylene

blue) removal rate of 87.8%, indicating that the CNC-g-AA-g-CA can be used as excellent

adsorbent and efficient flocculants. Besides, CNC-g-AA-g-CA have good stabilizing effects

on soybean oil/water Pickering emulsions and the resultant Pickering emulsion volume can

remain for 30 days or longer.