Facile and Green Synthesis of Carboxylated Cellulose Nanocrystals as Efficient Adsorbents in Wastewater Treatments
writer：Xue-Meng Fan,Hou-Yong Yu,Duan-Chao Wang,Zhong-Hao Mao,Juming Yao
keywords：cellulose nanocrystal, Fe2+/H2O2 oxidation, dye adsorption, copper ion adsorption
source：期刊
specific source：ACS Sustainable Chemistry & Engineering
Issue time：2019年
A simple and eco-friendly Fe2+/H2O2 oxidation of microcrystalline celluloses (MCCs) to prepare cellulose nanocrystals (CNCs) with high carboxylation content is proposed. The effffects of reaction times on the morphology, microstructure, and chemical and thermal properties of isolated carboxylated CNCs were investigated. The oxidative decomposition of Fe2+/H2O2 solution of MCC yielded CNCs with a size of 92?140 nm in length and 19?23 nm in width.The CNCs extracted at 6 h possessed the highest carboxyl content (2.2 mmol/g) with a zeta potential of ?41 mV and a thermal decomposition temperature of greater than 325 °C.These CNCs are effiffifficient adsorbents for dyes (methylene blue) and metal ions (copper ion) found in wastewater, with removal rates of up to 95.6 and 82.3%, respectively.