Liu Peng, Long Chao, Li Qifen, Qian Hongming, Li Aimin, Zhang Quanxing
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China.
J Hazard Mater. 2009 Jul 15;166(1):46-51. doi: 10.1016/j.jhazmat.2008.10.124. Epub 2008 Nov 11.
In this research, the adsorption equilibria of trichloroethylene (TCE) and benzene vapors onto hypercrosslinked polymeric resin (NDA201) were investigated by the column adsorption method in the temperature range from 303 to 333 K and pressures up to 8 kPa for TCE, 12 kPa for benzene. The Toth and Dubinin-Astakov (D-A) equations were tested to correlate experimental isotherms, and the experimental data were found to fit well by them. The good fits and characteristic curves of D-A equation provided evidence that a pore-filling phenomenon was involved during the adsorption of TCE and benzene onto NDA-201. Moreover, thermodynamic properties such as the Henry's constant and the isosteric enthalpy of adsorption were calculated. The isosteric enthalpy curves varied with the surface loading for each adsorbate, indicating that the hypercrosslinked polymeric resin has an energetically heterogeneous surface. In addition, a simple mathematic model developed by Yoon and Nelson was applied to investigate the breakthrough behavior on a hypercrosslinked polymeric resin column at 303 K and the calculated breakthrough curves were in high agreement with corresponding experimental data.
在本研究中，采用柱吸附法研究了三氯乙烯（TCE）和苯蒸气在超交联聚合物树脂（NDA201）上的吸附平衡，温度范围为303至333 K，TCE的压力高达8 kPa，苯的压力高达12 kPa。测试了托特（Toth）方程和杜比宁-阿斯塔科夫（Dubinin-Astakov，D-A）方程以关联实验等温线，发现实验数据与它们拟合良好。D-A方程的良好拟合和特征曲线证明，TCE和苯在NDA-201上吸附过程中存在孔填充现象。此外，还计算了亨利常数和等量吸附焓等热力学性质。每种吸附质的等量吸附焓曲线随表面负荷而变化，表明超交联聚合物树脂具有能量不均匀的表面。此外，应用Yoon和Nelson开发的一个简单数学模型研究了303 K下超交联聚合物树脂柱上的穿透行为，计算得到的穿透曲线与相应的实验数据高度吻合。
