摘要
研究香兰素在大孔吸附树脂LX-02上的吸附平衡、动力学以及动态吸附和解吸过程。考察p H对香兰素吸附的影响,并测定不同温度条件下香兰素的吸附等温线。结果表明:树脂LX-02吸附香兰素的最适p H为4.5;Freundlich模型可以更好地拟合香兰素吸附等温线(R2=1),香兰素在LX-02树脂上的吸附为放热过程,最大吸附量为162.96 mg/g。吸附动力学结果表明,香兰素吸附动力学符合准二阶动力学模型。香兰素在树脂上的传质速率随着温度和浓度的增加而增加,且20 min内即可达到吸附平衡。动态吸附和解吸实验发现,温度升高会导致香兰素在树脂上的吸附量降低,而流量对树脂吸附香兰素的影响可忽略不计,因此,最佳上柱条件为温度298.15 K、流量2 m L/min,最适解吸剂为0.05 mol/L Na OH。
The adsorption equilibrium,kinetics,dynamic adsorption and desorption process of vanillin onto macroporous resin LX-02 were studied. The optimal p H for vanillin adsorption onto the resin was 4. 5.Adsorption isotherms of vanillin were determined at different temperature and they were well fitted to Freundlich equation（ R2= 1）.The adsorption of vanillin onto resin LX-02 was a exothermic process. The maximum adsorption capacity of resin was 162. 96 mg/g. Batch kinetic experiments revealed that the adsorption process followed pseudo-second-order kinetic model.The mass transfer rate of vanillin onto the resin increased with the increase of temperature and initial concentration.The adsorption process was rapid and equilibrium was reached within 20 min.The dynamic adsorption and desorption experiments revealed that the adsorption capacity for vanillin decreased with the increase of temperature.The amount of vanillinadsorbed on LX-02 resin was not obviously affected by the flow rate was 2 mL/min.Thus,the optimal flow rate and temperature of dynamic adsorption process 298. 15 K,respectively. The optimal desorbent was0. 05 mol/L sodium hydroxide.
作者
季迎春
吴菁岚
周精卫
庄伟
应汉杰
JI Yingchun;WU Jinglan;ZHOU Jingwei;ZHUANG Wei;YING Hanjie(Jiangsu National Synergetic Innovation Center for Advanced Materials,College of Biotechnologyand Pharmaceutical Engineering,Nanjing Tech University,Nanjing 211800,China)
出处
《生物加工过程》
CAS
2018年第4期16-22,共7页
Chinese Journal of Bioprocess Engineering
基金
国家自然科学基金(21306086)
江苏省自然科学基金(BK20151452)
