Adsorption of nitrosamines by mesoporous zeolite.
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.
Lin
Wei Gang
WG
Key Laboratory of Mesoscopic Chemistry of MOE, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
Wei
Feng
F
Gu
Fang Na
FN
Dong
Xin
X
Gao
Ling
L
Zhuang
Ting Ting
TT
Yue
Ming Bo
MB
Zhu
Jian Hua
JH
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*
D004785:Environmental Pollutants; D009602:Nitrosamines; D017641:Zeolites; D012822:Silicon Dioxide; D009242:N-Nitrosopyrrolidine; C008655:N'-nitrosonornicotine