Cross-linked succinyl chitosan as an adsorbent for the removal of Methylene Blue from aqueous solution

• Published in: International journal of biological macromolecules Vol. 49; no. 4; pp. 643 - 651
• Main Authors: Huang, Xiao-Yi, Bu, Huai-Tian, Jiang, Gang-Biao, Zeng, Ming-Hua
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.11.2011
• Subjects: adsorbents; Adsorption; aqueous solutions; Basic dye; chitosan; Chitosan - chemical synthesis; Chitosan - chemistry; Chitosan derivative; Cross-Linking Reagents - chemistry; crosslinking; Differential Thermal Analysis; Diffusion; Dye removal; energy; enthalpy; entropy; Fourier transform infrared spectroscopy; heat production; Hydrogen-Ion Concentration; Kinetics; methylene blue; Methylene Blue - chemistry; Methylene Blue - isolation & purification; Microspheres; Models, Chemical; Solutions; sorption isotherms; Spectroscopy, Fourier Transform Infrared; Thermodynamics; Thermogravimetry; Time Factors; Wastewater treatment; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; X-Ray Diffraction; Dye removal; Chitosan derivative; Adsorption; Basic dye; Wastewater treatment
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2011.06.023

Removal of a basic dye (Methylene Blue) from aqueous solution was investigated using a cross-linked succinyl-chitosan (SCCS) as sorbent. The chemical structures of chitosan and its derivatives were testified by FT-IR. X-ray diffraction, DTG analysis and swelling measurements were conducted to clarify the characteristics of the chemically modified chitosan. The effect of process parameters, such as pH of the initial solution, and concentrations of dyes on the extent of Methylene Blue (MB) adsorption was investigated. The Langmuir isotherm model was used to fit the equilibrium experimental data, giving a maximum sorption capacity of 289.02mg/g at 298K. Kinetic studies showed that the kinetic data were well described by the pseudo-second-order kinetic model. Thermodynamic parameters such as enthalpy change (ΔH°), free energy change (ΔG°) and entropy change (ΔS°) were determined to be −25.32kJmol−1, −6.76kJmol−1 and −62.36Jmol−1K−1, respectively, which leads to a conclusion that the adsorption process is spontaneous and exothermic.