Trapping volatile nitrosamines with copper incorporated zeolitesElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b3/b304322c/

Abstract

Modification of zeolite with copper oxide significantly promotes the selectively adsorption of volatile nitrosamines, beneficial for the removal of nitrosamines in cigarette smoke.

Surface functionalization of SBA-15 by the solvent-free method

“…Copper-incorporated SBA-15 prepared by wet impregnation exhibited a high efficiency in trapping volatile nitrosamines despite the pore size of SBA-15 being tremendously larger than the molecular diameter of volatile nitrosamines [27]. Therefore, NPYR, one of the volatile nitrosamines, was used as the probe to survey the catalytic function of copper-incorporated SBA-15 for degradation of nitrosamines.…”

Micro- and mesoporous silicas synthesized in acidic water–ethanol solution of equimolar catanionic surfactant

“…As illustrated in Table 2, the large surface area and/or pore volume did not imply the high adsorptive capacity of N-nitrosohexa-methyleneimine (NHMI), one of small volatile nitrosoamines (VNAs) molecules, in cases of SiO 2 , MCM-41, MCM-48 and SBA-15. Due to the absence of strong adsorption sites in pure siliceous materials [19], the pore diameters of above-mentioned four samples are too large to trap small VNAs molecules. Despite the existence of the considerable micropores in SBA-15, the low capacity may contribute to the large (9.6 nm) and one dimensional mesopores, where small molecules of NHMI (0.59 nm) can easily diffuse out the pores.…”

Pollutant Diseases, Remediation and Recycling

“…For a given zeolite, however, its Al content actually exerts a stronger effect on its gaseous adsorptive capability, because the concentration of metal cation of zeolite relates to the Al content, and these cations form the electrostatic fi eld to pull the N-NO functional group of nitrosamines toward the channels as Fig. 9.6 shown (Xu et al 2003b ;Zhou et al 2004 ). Selective recognition of N -nitrosamine by zeolite ZSM-5 was also confi rmed through computational method (Pinisakul et al 2008 ), in which the adsorption confi gurations of several kinds of N -nitrosamines on the zeolite were investigated.…”

“…Introducing metal compounds is an effective way to improve the performance of zeolites in the adsorption of volatile nitrosamines (Cao et al 2007b ;Xu et al 2003b ), provided the object species and the introduction method are optimized. Many nitrosamines adsorb on zeolite through the way the N-NO groups insert into the zeolite channels , whose manner is similar to the adsorption of NOx in zeolite.…”

“…Zeolites also adsorb nitrosamines in aqueous solution and the adsorption isotherms can be fi tted with Freundlich equation Zhou and Zhu 2005 ). Moreover, several new functional materials can be fabricated by the modifi cation of zeolite with various physical or chemical methods to elevate the performance of nitrosamines trap (Xu et al 2003b ;Cao et al 2007b ;Yang et al 2010b ). Zeolites and other aluminosilicates are also used as tobacco additives (Meier and Siegmann 1999 ;Lin et al 2012a , b ).…”