Adsorption of Diclofenac sodium (cas 15307-79-6) on bilayer amino-functionalized cellulose nanocrystals/chitosan composite

Add time:08/07/2019    Source:sciencedirect.com

Residual Diclofenac sodium (cas 15307-79-6) (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 [email protected] involves chemical adsorption, and the maximum adsorption capacity obtained from the Langmuir model is 444.44 mg/g. [email protected] exhibits good adsorption capacity and high sustainability; thus, it is a promising composite material for the removal of DS from wastewater.

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