摘要
以木质素阳离子表面活性剂为改性剂制备有机改性硅藻土,并研究其对溶解和胶体性物质(DCS)模型物聚乙酸乙烯酯(PVAc)的吸附效果。主要探讨了PVAc质量浓度、吸附时间、吸附温度对吸附效果的影响,并在此基础上进一步推算得到了吸附过程的动力学和热力学参数:动力学模型相关系数R2均高于0.99;热力学参数ΔS=-61.39 J/mol,ΔH=-12.03 KJ/mol。实验发现,有机改性硅藻土对PVAc有良好的吸附效果,符合Langmuir吸附模型,升高温度可以增强PVAc在有机硅藻土上的吸附性能,对吸附过程的进行有促进作用;该吸附过程符合伪二阶动力学模型,属于物理吸附过程。
The kieselguhr was modified by lignin-based cationic surfactant which was obtained from the Mannich reaction. Modified organic kieselguhr exhibited an excellent adsorption of dissolved and colloidal substances （ DCS ） . In this paper, polyvinylacetate （ PVAc ） was chosen as the simulacrum of stickies. The effects of PVAc dosages, adsorption time and temperature on adsorption were discussed. Meanwhile, kinetic and thermodynamic parameters were obtained. Correlation coefficient of kinetic model, R^2 were all beyond 0. 99; the thermodynamic parameters ΔS, ΔH were -61. 39 J/mol and-12. 03 kJ/mol, respectively. The adsorption of PVAc on organic kieselguhr matched with the Langmuir model. The higher temperature was positive for the adsorption process. The adsorption process obeyed the pseudo-second-order kinetic model, and belonged to physical type.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2014年第6期8-12,共5页
Chemistry and Industry of Forest Products
基金
国家重点基础研究发展计划(2013CB228101)
中国国家高技术研究发展计划(2012AA101806)
