Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Chaoyang District, Beijing, PR China.
Bioresour Technol. 2013 Oct;145:37-42. doi: 10.1016/j.biortech.2013.02.064. Epub 2013 Feb 26.
To identify the adsorption characteristics of 1,3-propanediol on beta zeolite, the effects of temperature, zeolite dose, and 1,3-propanediol concentration were studied through batch experiments. The results showed that the pseudo-second order model expressed the kinetic data better. The experimental and theoretical adsorption capacities were 116.2 and 119.0 mg/g at 293 K, respectively. The adsorption equilibrium data were observed to satisfy the Freundlich isotherm model. Based on the Boyd plot, intraparticle diffusion primarily governed the uptake process. Moreover, thermodynamic parameters, such as changes in standard free energy (ΔG(0)), standard enthalpy (ΔH(0)), and standard entropy, were estimated. The negative values of ΔG(0) and ΔH(0) (-9.4 kJ/mol) indicated that the adsorption process was spontaneous, exothermic, and feasible. Finally, the activation energy derived from the Arrhenius equation suggested that the interaction mainly constitute physical adsorption.
为了确定 1,3-丙二醇在β沸石上的吸附特性，通过批量实验研究了温度、沸石剂量和 1,3-丙二醇浓度的影响。结果表明，准二级模型更好地表达了动力学数据。在 293 K 时，实验和理论吸附容量分别为 116.2 和 119.0 mg/g。吸附平衡数据符合 Freundlich 等温线模型。根据 Boyd 图，内扩散主要控制了吸附过程。此外，还估算了热力学参数，如标准自由能（ΔG(0)）、标准焓（ΔH(0)）和标准熵的变化。-9.4 kJ/mol 的负ΔG(0)和ΔH(0)值表明吸附过程是自发的、放热的和可行的。最后，Arrhenius 方程得出的活化能表明，相互作用主要由物理吸附构成。
