有机改性硅藻土对聚乙酸乙烯酯乳液吸附性能及其动力学的研究.pdfVIP

第34卷第6期 林　 产　 化　 学　 与　 工　 业 Vol.34 No.6 2014年12月 Chemistry and Industry of Forest Products Dec.2014 doi:10.3969/ j.issn.0253-2417.2014.06.002 有机改性硅藻土对聚乙酸乙烯酯乳液吸附性能 及其动力学的研究 毛翠平,武书彬∗ (华南理工大学制浆造纸工程国家重点实验室, 广东 广州 510640) 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 MAO Cui-ping　　 2 型相关系数R 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。 关键词:　 木质素阳离子表面活性剂;有机硅藻土;聚乙酸乙烯酯(PVAc);吸附 中图分类号:TQ35;TK6;X793　 　 　 　 　 　 文献标识码:A　 　 　 　 　 　 文章编号:0253-2417(2014)06-0008-05 Adsorption Property of Organically Modified Kieselguhr on Polyvinylacetate MAO Cui-ping,WU Shu-bin (State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou,510640,China) Abstract: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 2 coefficient of kinetic model, R 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 t