摘要
目的研究黄姜黄色素在大孔树脂上的吸附特性及热力学性质。方法采用静态法考察了8种大孔吸附树脂对黄姜黄色素的吸附及解析特性;根据不同等温吸附模型方程采用Matlab分别对实验数据进行线性及非线性回归,通过比较相关系数的平方确定模型的适用性;计算吸附过程热力学参数。结果4种模型的适用性依次Redlich-peterson>Langmuir>Temkin>Freundlich。吸附焓变和吸附熵变均大于零,吸附自由能小于零,平均吸附能小于20 kJ/mol。结论大孔树脂LX-18G对黄姜黄色素具有较好的吸附和脱附性能。Redlich-peterson模型可更好地描述黄姜色素在LX-18G树脂上的吸附特性,吸附为优惠吸附。吸附过程吸热,以物理吸附为主,吸附自发进行。
Aim To investigate the absorption property and thermodynamics of the yellow pigment extracted from Dioscorea zingiberensis on macroporous resins. Methods The absorption characteristics of eight types of macroporous resins were evaluated. The absorption data were regressed with Langmiur, Freundlich, Redlich-Peterson and Temkin isotherm models respectively, using the toolbox of Matlab. The model fitness was determined by R^2. Thermodynamic parameters were calculated by the Van＇ t Hoff equation. Results The model fitness could be prioritized in order from high to low as： Redlich-Peterson 〉 Langmuir 〉 Terkin 〉 Freundlich isotherms. The thermodynamic parameters were found to be H^0 〉 0, G^0 〈 0, S^0 〉 0, respectively. The average energy was under 20 kJ/mol. Conclusion The LX-18G showed good property for the adsorption of yellow pigment. Redlich-Peterson model could well describe the absorption. The negative value of GO indicates the feasibility and spontaneity of the absorption process. The positive value of H^0 suggests the endothermic nature of the adsorption. The absorption process is dominated by physisorption.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第4期579-583,共5页
Journal of Northwest University（Natural Science Edition）
基金
陕西省重点实验室访问学者专项基金资助项目(07JZF06)
陕西省教育厅重大产业化基金资助项目(04JC03)
关键词
黄姜
黄色素
大孔树脂
模型
热力学
yellow pigment
Dioscorea zingiberensis
macroporousresins
model
thermodynamics
