Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, 22 Hankou Road, Gu-lou, Nanjing 210093, Jiangsu, China.
J Hazard Mater. 2010 Jul 15;179(1-3):1031-6. doi: 10.1016/j.jhazmat.2010.03.108. Epub 2010 Mar 31.
To enable zeolite to trap bulky environment pollutants such as tobacco specific nitrosamines (TSNAs), we tailored the porous structure of MCM-22 zeolite by desilication to obtain a sample with mesopores centered 3.5 nm, in order to promote the mass transport. The meso-MCM-22 was further functionalized with -SO(3)H group to enhance the efficiency in adsorption of TSNAs. The composites were characterized by XRD and BET methods, and their adsorptive function was assessed in both liquid adsorption of N'-nitrosonornicotine (NNN) and the adsorption of TSNAs in aqueous tobacco-extract solution. Grafting -SO(3)H group on alkaline-treated MCM-22 significantly elevated the adsorption toward nitrosamines, and the resulting composite could reduce above 70% of NNN in dichloromethane solution or 54% of TSNAs in tobacco-extract solution.
为了使沸石能够捕获像烟草特有亚硝胺（TSNAs）这样体积庞大的环境污染物，我们通过脱硅处理来调整 MCM-22 沸石的多孔结构，得到介孔中心位于 3.5nm 的样品，以促进传质。然后，将介孔 MCM-22 进一步功能化 -SO(3)H 基团，以提高对 TSNAs 的吸附效率。采用 XRD 和 BET 方法对复合材料进行了表征，并在 N'-亚硝降烟碱（NNN）的液相吸附和水溶液中烟草提取物中亚硝胺的吸附实验中评估了它们的吸附性能。在碱性处理的 MCM-22 上接枝 -SO(3)H 基团显著提高了对亚硝胺的吸附能力，得到的复合材料可以在二氯甲烷溶液中去除超过 70%的 NNN，或在烟草提取物溶液中去除 54%的 TSNAs。
