title: Capturing nitrosamines in tobacco-extract solution by hydrophobic mesoporous silica.
abstract: Adsorption of tobacco-specific nitrosamines (TSNA) by the functionalized MCM-48 mesoporous silica in tobacco-extract solution was studied using batch experiments, in order to explore the new strategy enhancing the efficiency of molecular sieve in the solution with complex composition. The techniques of XRD, N(2) adsorption-desorption at 77K, (29)Si MAS NMR, (27)Al MAS NMR and TG-DSC together with FTIR were used to inspect the mesoporous adsorbents. The hydrophobic character of adsorbent is crucial for the adsorption of TSNA in aqueous solution, and the organic 3-chloropropyltriethoxysilane (CPTES) was employed to functionalize the ordered porous silica through direct co-condensation and post-synthesis grafting methods. Besides, aluminum is also incorporated into the framework of MCM-48 to enhance the adsorption capability of nitrosamines. As the result, about 70% of TSNA can be removed by the chloropropyl-modified Al-containing mesoporous silica, obviously exceeded that by activated carbon, offering the new efficient adsorbents for environment protection.
authors.affiliation: Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wei
authors.forename: Jia Yuan
authors.initials: JY
authors.lastname: Yang
authors.forename: Ling
authors.initials: L
authors.lastname: Gao
authors.forename: Fang Na
authors.initials: FN
authors.lastname: Gu
authors.forename: Jian Hua
authors.initials: JH
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D057927:Hydrophobic and Hydrophilic Interactions; D009602:Nitrosamines / Q000302:isolation & purification*; D010936:Plant Extracts / Q000737:chemistry; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions; D014026:Nicotiana / Q000737:chemistry*
chemical_list: D009602:Nitrosamines; D010936:Plant Extracts; D012996:Solutions; D012822:Silicon Dioxide