Hierarchical functionalized MCM-22 zeolite for trapping tobacco specific nitrosamines (TSNAs) in solution.
Hierarchical functionalized MCM-22 zeolite for trapping tobacco specific nitrosamines (TSNAs) in solution.
复制标题
DOI：
10.1016/j.jhazmat.2010.03.108
复制
发表时间：
2010-07
影响因子：
13.6
通讯作者：
Jing Yang;Jia Yuan Yang;Yu Zhou;F. Wei;W. Lin;J. Zhu
中科院分区：
文献类型：
--
作者：
Jing Yang;Jia Yuan Yang;Yu Zhou;F. Wei;W. Lin;J. Zhu
为了使沸石能够捕获烟草特有的亚硝胺(TSNAs)等大量环境污染物，我们通过脱硅的方法对MCM-22沸石的孔结构进行了裁剪，得到了中孔中心为3.5 nm的样品，以促进传质。进一步用-SO3H基对Meso-MCM-22进行官能化处理，提高了对TSNAs的吸附效率。用X射线衍射法和BET法对其进行了表征，并考察了其对N‘-亚硝基烟碱(NNN)的液体吸附性能和对烟草水溶液中TSNAs的吸附性能。碱处理的MCM-22分子筛表面接枝-SOH基团显著提高了对亚硝胺的吸附，使二氯甲烷溶液中的NNN和烟草提取物溶液中的TSNAs分别降低了70%以上和54%以上。
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 3.5nm, in order to promote the mass transport. The meso-MCM-22 was further functionalized with –SO3H 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 –SO3H 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.