Efficient removal of Cu2+ in water by carboxymethylated cellulose nanofibrils: performance and mechanism.

Efficient removal of Cu2+ in water by carboxymethylated cellulose nanofibrils: performance and mechanism. Biomacromolecules. 2019 Nov 11;: Authors: Qin F, Fang Z, Zhou J, Sun C, Chen K, Ding Z, Li G, Qiu X Abstract Simultaneous production and functionalization of cellulose nanofibrils (CNFs) for heavy metal ions removal is an economical and promising solution to expedite their use in water treatment. In this work, carboxymethylated CNFs (CMCNFs) with a carboxylate content up to 2.7 mmol/g are prepared by a combination of carboxymethylation and homogenization, which show a 3.40-3.53 nm in diameter and a 1210.6-383.3 nm in length. The effect of experimental conditions (including pH, carboxylate content, contact time, initial Cu2+ concentration) on the removal performance of CMCNFs for Cu2+ is investigated in detail. Adsorption performance of CMCNFs present a record high equilibrium Cu2+ removal capacity of 115.3 mg/g at pH 5.0. Additionally, the underlying mechanism for the removal of Cu2+ ions was uncovered by coupling the fitting results based on pseudo-second-order kinetic model and Langmuir isotherm model with various characterizations such as scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, EDS mapping and X-ray photoelectron spectroscopy (XPS) , Atomic force microscope (AFM) and X-ray diffraction (XRD). Finally, the potential application of CMCNF-2.7 with high carboxylate content in converting cop...
Source: Biomacromolecules - Category: Biochemistry Authors: Tags: Biomacromolecules Source Type: research