吸附树脂吸附蜂蜜中羟甲基糠醛的热力学研究

Thermodynamic properties of hydroxymethyl furfural in honey on the macroporous adsorption resin

摘要: 为考察大孔吸附树脂对蜂蜜中羟甲基糠醛(HMF)的吸附可行性，该文采用静态吸附法研究了LSA-800B型大孔树脂对HMF吸附过程的热力学性质。结果表明，在298，308，318 K和研究的浓度范围内，蜂蜜中的HMF在LSA-800B型树脂上的吸附等温线均符合Freundlich等温吸附方程，Freundlich吸附等温线和等量吸附焓表明LSA-800B型树脂对蜂蜜中HMF吸附是放热过程。吸附自由能ΔG＜0表明吸附的自发性，吸附熵变ΔS＜0说明吸附质分子在吸附树脂表面上的运动比在溶液中受到更大的限制。

Abstract: Thermodynamic properties of adsorption of hydroxymethyl furfural(HMF) in honey by macroporous adsorption resins(LSA-800B) were investigated using static adsorption method. Equilibrium data for the adsorption of HMF in honey at 298, 308, 318 K, respectively and investigative concentration range were obtained and were correlated with a Freundlich-type of isotherm equation. Freundlich adsorption isotherms and isosteric enthalpy of adsorption indicate that the process of adsorption of HMF by LSA-800B resin is an exothermic process. The negative value of ΔG indicates the spontaneous nature of the adsorption process. The negative values of the adsorption entropy indicate the more restricted mobility of the HMF on resin surface than that in solution.