标题：Removal of anionic dyes by silica-chitosan composite in single and binary systems: Valorization of shrimp co-product “Crangon-Crangon” and “Pandalus Borealis”,
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2017
卷号：8
期号：2
页码：724-739
出版社：University of Mohammed Premier Oujda
摘要：In this work, we study the elimination of two anionic dyes (Reactive Red 23 andReactive Blue 19) in single and binary systems of dyes by adsorption on silicachitosancomposite (Si-Cs). This study focuses on the effectiveness of our Si-Cscomposite synthesized chemically by the extraction of chitosan from shrimp« Pendalus Borealis » and « Crangon-Crangon» co-products by the hydrothermochemicaltechnique. The composite obtained was characterized by infraredspectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope(SEM) and energy dispersive X-ray analysis (EDXA). The Si-Cs composite wasfound to have excellent dyes adsorption capacity in both single and binary systemof dyes. Batch experiments were carried out for adsorption kinetics, isotherms andthermodynamics. Operational parameters studied were pH, contact time,temperature, dye and adsorbent concentrations. Dyes elimination percentage wasbetween 89% and 97% in both systems, with an optimal contact time of 180min.Equilibrium data agreed well with the Freundlich isotherm model. While thekinetics and thermodynamics parameters were used to establish the adsorptionmechanism, the pseudo-second-order kinetic model has presented the best fitting;Thermodynamic studies revealed that the nature of adsorption is not spontaneousand exothermic with a physical adsorption.
关键词：Chitosan;Silica;Composite; Adsorption; Reactive Red 23; Reactive Blue 19; Binary system
