Adsorption characteristics of malic acid from aqueous solutions by weakly basic ion-exchange chromatography

被引：17

作者：

Gao, Qiang ^{[1
]}

Pan, Chaogiang ^{[1
]}

Liu, Fabao ^{[1
]}

Lu, Fuping ^{[1
]}

Wang, Depei ^{[1
]}

Zhang, Jian ^{[1
]}

Zhu, Yan ^{[1
]}

机构：

[1] Tianjin Univ Sci & Technol, Key Lab Ind Fermentat Microbiol, Minist Educ, Logist Serv Grp,Coll Biotechnol,TEDA, Tianjin 300457, Peoples R China

来源：

JOURNAL OF CHROMATOGRAPHY A | 2012年 / 1251卷

基金：

美国国家科学基金会;

关键词：

Malic acid; Amberlite IRA-67; Adsorption; Kinetics; Isotherm; Thermodynamics; ORGANIC-ACIDS; ASPERGILLUS-FLAVUS; WASTE-WATER; EQUILIBRIUM; REMOVAL; EXTRACTION; SEPARATION; KINETICS; SORPTION; RESINS;

D O I：

10.1016/j.chroma.2012.06.057

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

In this study, we reported the effects of temperature, malic acid loading concentration, and resin dose on malic acid adsorption by IRA-67 in batch experiments. The kinetic data well fitted the pseudo-second-order kinetic model. Both the equilibrium and ultimate adsorption slightly decreased with increased temperature from 303 to 323 K at 74.7 g/L malic acid loading concentration. The malic acid adsorption was revealed as a homogeneous adsorbent process by the Langmuir model and film diffusion process at loading concentrations of 18.2-94.5 g/L malic acid by the Boyd plot. The values of effective diffusion coefficient D-i also increased with the temperature. Based on Eq. (15), the negative values of Delta G degrees and Delta H degrees revealed that the adsorption process was spontaneous and exothermic. The negative value of Delta S degrees also indicated the decrease in the solid-liquid interface randomness at this interface when malic acid is adsorbed by IRA-67. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：148 / 153

页数：6

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