title: Adsorption of nitrosamines by mesoporous zeolite.
abstract: On the basis of a study of the adsorption of zeolite and mesoporous silica, we attempted to create a hierarchical structure in the new nitrosamines trapper. Thus, mesoporous HZSM-5 zeolite was fabricated through impregnating a structure-directing agent into the as-synthesized MCM-41 followed by dry-gel conversion to transform amorphous silica to zeolite crystal. The texture of mesoporous ZSM-5 was tailored by adjusting the Si/Al ratio in the MCM-41 source and the thermal treatment time. The resulting samples were characterized by N(2) adsorption to evaluate their textural properties. One volatile nitrosamine, N-nitrosopyrrolidine (NPYR), was used as probe molecule in instantaneous adsorption to survey the function of the resulting composites. Adsorptions of N'-nitrosonornicotine (NNN) in dichloromethane solution and tobacco-specific nitrosamines (TSNA) in tobacco-extract solution were also utilized for the same purpose. As expected, mesoporous zeolite exhibits a good adsorption capacity in laboratory tests, superior to either microporous zeolite or mesoporous silica, providing a valuable candidate for controlling nitrosamines in the environment.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
authors.forename: Wei Gang
authors.initials: WG
authors.lastname: Lin
authors.forename: Feng
authors.initials: F
authors.lastname: Wei
authors.forename: Fang Na
authors.initials: FN
authors.lastname: Gu
authors.forename: Xin
authors.initials: X
authors.lastname: Dong
authors.forename: Ling
authors.initials: L
authors.lastname: Gao
authors.forename: Ting Ting
authors.initials: TT
authors.lastname: Zhuang
authors.forename: Ming Bo
authors.initials: MB
authors.lastname: Yue
authors.forename: Jian Hua
authors.initials: JH
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D004785:Environmental Pollutants / Q000737:chemistry / Q000302:isolation & purification; D009242:N-Nitrosopyrrolidine / Q000737:chemistry; D009602:Nitrosamines / Q000737:chemistry* / Q000302:isolation & purification; D012822:Silicon Dioxide / Q000737:chemistry; D014026:Nicotiana / Q000737:chemistry; D017641:Zeolites / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D009602:Nitrosamines; D017641:Zeolites; D012822:Silicon Dioxide; D009242:N-Nitrosopyrrolidine; C008655:N'-nitrosonornicotine