College of Natural Resources and Environment, South China Agricultural University, Guangzhou, PR China.
Int J Biol Macromol. 2011 Nov 1;49(4):643-51. doi: 10.1016/j.ijbiomac.2011.06.023. Epub 2011 Jun 30.
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.
采用交联琥珀酰壳聚糖（SCCS）作为吸附剂，研究了从水溶液中去除碱性染料（亚甲蓝）的方法。通过傅里叶变换红外光谱（FT-IR）验证了壳聚糖及其衍生物的化学结构。通过 X 射线衍射、DTG 分析和溶胀测量来阐明化学改性壳聚糖的特性。考察了初始溶液 pH 值和染料浓度等工艺参数对亚甲蓝（MB）吸附程度的影响。采用 Langmuir 等温模型拟合平衡实验数据，在 298 K 时得出最大吸附容量为 289.02 mg/g。动力学研究表明，准二级动力学模型能够很好地描述动力学数据。测定了热力学参数，如焓变（ΔH°）、自由能变（ΔG°）和熵变（ΔS°），分别为-25.32 kJmol(-1)、-6.76 kJmol(-1)和-62.36 Jmol(-1) K(-1)，这表明吸附过程是自发的和放热的。
