title: Cross-linked succinyl chitosan as an adsorbent for the removal of Methylene Blue from aqueous solution.
abstract: 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 289.02 mg/g at 298 K. 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 -25.32 kJmol(-1), -6.76 kJmol(-1) and -62.36 Jmol(-1) K(-1), respectively, which leads to a conclusion that the adsorption process is spontaneous and exothermic.
authors: College of Natural Resources and Environment, South China Agricultural University, Guangzhou, PR China.
authors: Xiao-Yi
authors: XY
authors: Huang
authors: Huai-Tian
authors: HT
authors: Bu
authors: Gang-Biao
authors: GB
authors: Jiang
authors: Ming-Hua
authors: MH
authors: Zeng
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000138:chemical synthesis / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004055:Differential Thermal Analysis; D004058:Diffusion; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry / Q000302:isolation & purification*; D008863:Microspheres; D008956:Models, Chemical; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D013818:Thermogravimetry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D014961:X-Ray Diffraction
chemical_list: D003432:Cross-Linking Reagents; C118639:N-succinyl-chitosan; D012996:Solutions; D014874:Water Pollutants, Chemical; D048271:Chitosan; D008751:Methylene Blue