Guo Zhaobing, Zheng Shourong, Zheng Zheng, Jiang Fang, Hu Wenyong, Ni Lixiao
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, PR China.
Water Res. 2005 Mar;39(6):1174-82. doi: 10.1016/j.watres.2004.12.031.
The selective adsorption of p-chloronitrobenzene (p-CNB) using zeolite as the adsorbent from an aqueous mixture containing p-CNB and o-chloronitrobenzene (o-CNB) was investigated. The maximum adsorption amounts of p-CNB in HZSM-5 zeolite were found to be approximately 4 molecules per unit cell (mol/uc) at all adsorption temperatures investigated. The maximum adsorption amounts of o-CNB in HZSM-5 zeolite were, however, markedly lower than those of p-CNB at different adsorption temperatures. Diffusion results revealed that the diffusivity of p-CNB at 300K was about 100 times higher than that of o-CNB in HZSM-5 zeolite. The remarkable difference in the adsorption amounts and diffusivities between p-CNB and o-CNB resulted in separation factors of 463.6, 96.8 and 21.9 for p-CNB at 278, 300 and 323 K, respectively, indicating a selective adsorption of p-CNB in HZSM-5 zeolite from the aqueous mixture of p- and o-CNB.
研究了以沸石为吸附剂从含有对氯硝基苯（p-CNB）和邻氯硝基苯（o-CNB）的水混合体系中选择性吸附对氯硝基苯的情况。在所研究的所有吸附温度下，发现HZSM-5沸石中对氯硝基苯的最大吸附量约为每晶胞4个分子（mol/uc）。然而，在不同吸附温度下，HZSM-5沸石中邻氯硝基苯的最大吸附量明显低于对氯硝基苯。扩散结果表明，在300K时，对氯硝基苯在HZSM-5沸石中的扩散系数比对氯硝基苯高约100倍。对氯硝基苯和邻氯硝基苯在吸附量和扩散系数上的显著差异导致在278K、300K和323K时，对氯硝基苯的分离因子分别为463.6、96.8和21.9，这表明在HZSM-5沸石中能够从对氯硝基苯和邻氯硝基苯的水混合体系中选择性吸附对氯硝基苯。
