摘要
从8种不同结构的阴离子交换树脂中筛选出D318树脂对水溶液中苏氨酸和谷氨酸的静态吸附分离及其热力学性质进行了研究。结果表明,langmuir模型对实验数据的拟合度优于Freundlich模型,且苏氨酸和谷氨酸在树脂吸附过程中都表现为优惠吸附。热力学研究结果表明,在293～313 K条件下,苏氨酸吸附量为8～10 mg/g的吸附焓变为30.026～31.615 kJ/mol,自由能变为-14.337～-26.340 kJ/mol、吸附熵变为-48.616～-16.855 J/(mol.K);而谷氨酸吸附量为30～50 mg/g的吸附焓变为-58.036～-60.053 kJ/mol,自由能变为-85.017～-137.647 kJ/mol、吸附熵变为92.084～247.905 J/(mol.K)。
The adsorption and thermodynamic behavior of threonine and glutamic acid in aqueous solution on D318 resin selected from eight different structural anion exchange resins were investigated by the static method. Two models of Langmuir and Freundlich were used to simulate the equilibrium adsorption isotherm curves of threonine and glutamic acid. The results show that the adsorption isotherm curves of threonine and glutamic acid on D318 resin fit in better with Langmuir adsorption isotherm equation and the adsorption of them on D318 resin behave benefitful adsorption. The study of thermodynamics show that when the adsorption of threonine are 8 - 10 mg/g in 293 - 313 K, adsorption enthalpy change AH are 30. 026 - 31. 615 kJ/mol, free energys AG - 14. 337 - -26. 340 kJ/mol, entropys of adsorption AS -48. 616 - - 16. 855 J/（mol · K） ; and when the adsorption of glutamic acid are 30 - 50 mg/g in 293 - 313 K, adsorption enthalpy △H are -58. 036 - -60. 053 kJ/mol, free energys △G -85.017 - - 137. 647 kJ/mol, entropys of adsorption △S 92. 084 - 247. 905 J/（ mol · K）.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第4期452-456,共5页
Chinese Journal of Applied Chemistry
关键词
阴离子交换树脂
苏氨酸
谷氨酸
吸附分离
热力学性质
anion exchange resin
threonine
glutamic acid
adsorption separation
thermodynamic property
作者简介
通讯联系人：彭奇均，男，教授；E-mail：qjpeng@puNicl．wx．js．cn；研究方向：工业分离
