dos Anjos Fernanda S C, Vieira Eunice F S, Cestari Antonio R
Departamento de Química/CCET, Universidade Federal de Sergipe, 49000-000 São Cristovão, Sergipe, Brazil.
J Colloid Interface Sci. 2002 Sep 15;253(2):243-6. doi: 10.1006/jcis.2002.8537.
Chitosan can use its protonated amine groups to adsorb strongly anionic species from diluted solutions. In this work, adsorption and thermochemical data on the interaction of the dye indigo carmine with chitosan in aqueous medium were found, in order to obtain new adsorption data on this relatively unexplored chitosan field. The studies were carried out by the batch method from 35 to 50 degrees C. The adsorption results were well fitted to both Langmuir and Freundlich adsorption models. The increase in the temperature decreased the adsorption of the dye. The enthalpy of interaction, when a monolayer of the dye was formed on the chitosan surface, delta(int)H, of -23.2 kJ mol(-1) was encountered for all temperature ranges studied. The spontaneity of the interaction is indicated by the delta(int)G values from -9.1 to -8.2 kJ mol(-1). Other thermodynamic quantities were also calculated and are discussed.
壳聚糖可以利用其质子化的胺基从稀溶液中强烈吸附阴离子物质。在这项工作中，发现了染料靛蓝胭脂红与壳聚糖在水介质中相互作用的吸附和热化学数据，以便在这个相对未被充分探索的壳聚糖领域获得新的吸附数据。研究在35至50摄氏度下采用分批法进行。吸附结果与朗缪尔和弗伦德利希吸附模型都拟合得很好。温度升高会降低染料的吸附。在所研究的所有温度范围内，当在壳聚糖表面形成单层染料时，相互作用焓Δ(int)H为-23.2 kJ·mol⁻¹。相互作用的自发性由-9.1至-8.2 kJ·mol⁻¹的Δ(int)G值表明。还计算并讨论了其他热力学量。
