Adsorption of diclofenac sodium on bilayer amino-functionalized cellulose nanocrystals/chitosan composite

Journal of Hazardous Materials
Dalin HuXiao-Kun Ouyang

Abstract

Residual diclofenac sodium (DS) in the environment is harmful to human health. A promising method for DS removal is the use of adsorbents functionalized with amino groups that can form an ionic bond with the carboxyl group of DS at a suitable pH. In this work, a novel composite adsorbent composed of cellulose nanocrystals (CNC) and chitosan (CS) has been synthesized and functionalized by ethylenediamine (ED) in both layers. Characterization methods, including scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectrometry, and X-ray photoelectron spectroscopy, were used to confirm the morphology and synthetic mechanism of the double- amino-functionalized adsorbent. Based on the optimization of adsorption conditions and modeling of the adsorption mechanism, the DS adsorption process on CNC-ED@CS-ED involves chemical adsorption, and the maximum adsorption capacity obtained from the Langmuir model is 444.44 mg/g. CNC-ED@CS-ED exhibits good adsorption capacity and high sustainability; thus, it is a promising composite material for the removal of DS from wastewater.

Citations

Jun 19, 2019·International Journal of Environmental Health Research·Mariela A AgotegarayVerónica L Lassalle
Jul 14, 2020·Environmental Science and Pollution Research International·Monika JainMika Sillanpää
Feb 26, 2020·International Journal of Biological Macromolecules·A TshikovhiAjay K Mishra
Aug 24, 2021·Carbohydrate Polymers·Aihua QiaoRongxin Su
Jan 23, 2022·Environmental Science and Pollution Research International·Huajian YuPeipei Meng

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