Removal of anionic dye eosin Y from aqueous solution using ethylenediamine modified chitosan

• Published in: Carbohydrate polymers Vol. 84; no. 4; pp. 1350 - 1356
• Main Authors: Huang, Xiao-Yi, Bin, Jian-Ping, Bu, Huai-Tian, Jiang, Gang-Biao, Zeng, Ming-Hua
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 02.04.2011; Elsevier
• Subjects: Adsorbents; Adsorption; agitation; Applied sciences; aqueous solutions; Chemistry; Chitosan; Chitosan derivative; crosslinking; Effluent treatment; energy; enthalpy; entropy; Eosin Y; Exact sciences and technology; Fourier transform infrared spectroscopy; General and physical chemistry; heat production; Natural polymers; particle size; Physicochemistry of polymers; Sorbent; sorption isotherms; Starch and polysaccharides; Surface physical chemistry; temperature; X-ray photoelectron spectroscopy; zeta potential; Effluent treatment; Eosin Y; Chitosan; Adsorption; Chitosan derivative; Sorbent; Epichlorhydrin; Adsorption isotherm; Temperature effect; Eosin; Aqueous medium; Crosslinked polymer; Organic dye; Liquid solid adsorption; Crosslinking; Experimental study; Organic adsorbent; Diamine; Chemical modification; Chitosan derivatives; Preparation; Oside polymer; Kinetics; Heat of adsorption; Successive reaction
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2011.01.033

In this study, chitosan was cross-linked with ethylenediamine (EDA) to prepare an outstanding sorbent for the removal of anionic dye eosin Y from aqueous solution. FTIR, DTG, XPS and zeta potential analysis were used to characterize the sorbent. The effect of particle size, solution pH, agitation rate, temperature, adsorbent dosage (50–500mg/L), contact time (10min–24h) and initial concentration of dye (50–300mg/L) on the adsorption process was investigated. Langmuir and Freundlich adsorption models were applied to describe the isotherms and isotherm constants, and the data fitted well with Langmuir model with a maximum adsorption capacity of 294.12mg/g at 25°C. Kinetic studies followed the pseudo second-order rate model, which indicated that the chemisorption is the rate-limiting step. Thermodynamic parameters such as enthalpy change (ΔH°=−5.004kJ/mol), free energy change (ΔG°<0) and entropy change (ΔS°=−11.656J/(molK)) indicate the exothermic and spontaneous nature of adsorption.