摘要
通过静态吸附实验,选择AB-8型大孔树脂对花生壳总黄酮进行吸附,研究了吸附过程中的热力学特性。采用Freundlich、Langmuir和Temkin 3种常用的吸附等温方程拟合形成吸附等温线方程,在此基础上利用热力学函数计算吸附过程中的吸附焓变ΔH、熵变ΔS和自由能变ΔG。结果表明:该吸附是一个物理过程;Freundlich吸附等温线模型能可靠地反映吸附过程,20、25、30、35、40℃5个温度下的特征参数n值都大于1,表明吸附是优惠吸附;吸附过程中焓变ΔH大于0且与温度无关、熵变ΔS大于0和自由能变ΔG小于0,表明吸附是由熵推动的自发的吸热过程。
Through static adsorption experiments, thermodynamic characteristics of adsorption process were studied by choosing AB -8 type macroporous resin for adsorption of total flavonoids from peanut hull. The adsorption enthalpy variable AH, the entropy variable AS and the free energy variable AG in the adsorption process were calculated by using the thermodynamic function on the basis of the adsorption isotherm of Freundlich, Langmuir and Temkin. The results showed that the adsorption was a physical process; Freundlich adsorption isotherm model could reliably reflect the acteristic parameters n value under the five different temperatures including 20,25,30,35,40 ℃ were higher than 1, indicating that the adsorption was a preferential adsorption. In the process of adsorption, the enthalpy variable ΔH 〉 0, which had nothing to do with the temperature, the entropy variable ΔS 〉 0 and the free energy variable ΔG 〈 0, indicating that the adsorption was a spontaneous endothermic process driven by entropy.
作者
张斌
伍亚华
孙兰萍
ZHANG Bin;WU Yahua;SUN Lanping(School of Food and Biological Engineering,Bengbu University,Bengbu 233030,Anhui,Chin)
出处
《中国油脂》
CAS
CSCD
北大核心
2018年第7期36-40,共5页
China Oils and Fats
基金
安徽省高校学科(专业)拔尖人才学术资助项目(gxbj ZD50)
蚌埠学院学术带头人及后备人选项目
安徽省质量工程省级名师工作室(2016msgzs044)
关键词
大孔树脂
花生壳总黄酮
吸附热力学
macroporous resin
peanut hull total flavonoids
adsorption thermodynamics
