CAJ | 학술논문

通过在不同温度下的静态吸附实验，研究了葡萄籽原花青素在大孔树脂HZ818上的吸附热力学及动力学特性。分别采用Langmuir、Freundlich等温式对不同温度下的等温吸附数据进行拟合，采用Largergren拟一级动力学模型、拟二级动力学模型和颗粒内扩散动力学模型对吸附动力学数据进行分析。结果表明：原花青素在HZ818树脂上的吸附量随着温度的升高而增大，等温吸附数据更符合Langmuir等温吸附方程，吸附焓变大于0，吉布斯自由能变小于0，HZ818树脂对原花青素的吸附过程为自发进行的吸热过程；吸附动力学更符合拟二级动力学模型，过程受主要包括颗粒内扩散在内的多因素共同影响。
통과재불동온도하적정태흡부실험，연구료포도자원화청소재대공수지HZ818상적흡부열역학급동역학특성。분별채용Langmuir、Freundlich등온식대불동온도하적등온흡부수거진행의합，채용Largergren의일급동역학모형、의이급동역학모형화과립내확산동역학모형대흡부동역학수거진행분석。결과표명：원화청소재HZ818수지상적흡부량수착온도적승고이증대，등온흡부수거경부합Langmuir등온흡부방정，흡부함변대우0，길포사자유능변소우0，HZ818수지대원화청소적흡부과정위자발진행적흡열과정；흡부동역학경부합의이급동역학모형，과정수주요포괄과립내확산재내적다인소공동영향。
The adsorption thermodynamics and kinetics of grape seeds proanthocyanidins on HZ81 8 macroporous resin were evaluated through the experiments in a batch system at different temperatures.The results indicate that the higher the temperature,the better the adsorptive capacity would be.The Langmuir isotherm model provides a better description for the adsorption equilibrium when compared to the Freundlich isotherm equation in the conditions of the present study.In addition,the thermodynamic constants of the process were also evaluated.The positive values of the adsorption enthalpy and the negative values of the free energy indicate a spontaneous endothermic nature of the process.In order to examine the controlling mechanisms of the process,the kinetic equations of the mass transfer and chemical reaction,the pseudo-first order model,the pseudo-second order model and the intraparticle diffusion model were used to correlate the experimental data respectively.It shows that the pseudo-second order kinetic model can provide a better correlation,and the adsorption process is affected by many factors simultaneously and mainly controlled by intra-particle diffusion.