Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science and Technology), Ministry of Education, College of Biotechnology, Logistics Service Group, Tianjin University of Science and Technology, Tianjin 300457, China.
J Chromatogr A. 2012 Aug 17;1251:148-153. doi: 10.1016/j.chroma.2012.06.057. Epub 2012 Jun 26.
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 ΔG° and ΔH° revealed that the adsorption process was spontaneous and exothermic. The negative value of ΔS° also indicated the decrease in the solid-liquid interface randomness at this interface when malic acid is adsorbed by IRA-67.
在这项研究中，我们报告了温度、苹果酸加载浓度和树脂剂量对 IRA-67 批量吸附苹果酸的影响。动力学数据很好地符合伪二级动力学模型。在 74.7 g/L 的苹果酸加载浓度下，随着温度从 303 K 升高到 323 K，平衡和最终吸附略有下降。通过 Boyd 图，苹果酸吸附被揭示为一种均相吸附剂过程，在 18.2-94.5 g/L 的苹果酸负载浓度下，由朗缪尔模型和薄膜扩散过程决定。有效扩散系数 D(i)的值也随温度升高而增加。根据方程 (15)，ΔG°和ΔH°的负值表明吸附过程是自发的和放热的。ΔS°的负值也表明当 IRA-67 吸附苹果酸时，固-液界面的无序度降低。
