Liquid adsorption of tobacco specific N-nitrosamines by zeolite and activated carbon

Hierarchical Composites to Reduce N-Nitrosamines in Cigarette Smoke

“…The four components of TSNA, NAB, NAT, NNK, and NNN have different molecular structures ( Scheme 1 ) but their reduction by the MZ2 additive was similar (28%–31%, Table 4 ) within the experimental error. This phenomenon implies the existence of an “insertion model” in the adsorption of TSNA by the hierarchical additive, in which the TSNA molecule inserts its N-NO group inside the channel of the adsorbent because of the electrostatic inducement from the cations in the channel [ 42 ]. In order to fully assess the function of porous additives in cigarette filters in the selective reduction of TSNA, the ratio of TSNA to tar (NFDPM) was calculated from the data of Table 3 and Table 4 .…”

Degradation of N-nitrosodimethylamine (NDMA) and its precursor dimethylamine (DMA) in mineral micropores induced by microwave irradiation

“…Furthermore, DMA, which is a precursor of NDMA, is formed from decomposition of NDMA in some of these treatments, and re-generation of NDMA can occur in the presence of chloramine or nitrite (Mitch and Sedlak, 2002). With the unique shape selectivity, zeolites have been studied for adsorbing nitrosamines from gas stream and solution (Zhou and Zhu, 2005;Pinisakul et al, 2008;Kamaloo et al, 2013;Li et al, 2013;Sun et al, 2014). Strong binding of NDMA molecules occurs in the zeolitic channels because of the interaction between the oxygen or nitrogen atoms of NDMA molecules and the silicon atoms of all-silica MFI framework, sodium atoms of Na-ZSM-5, and hydrogen of H-ZSM-5 (Kamaloo et al, 2013).…”

Various Impregnation Methods Used for the Surface Modification of the Adsorbent: A Review

“…The prominent methods used are chemical treatment and physical treatment methods. Various chemicals such as acids, bases, surfactants, oxidizing agents, metal salts are used for the above processes [7,8,9]. The modification of the surface can be done by metal impregnation, chemical grafting and functionalization techniques [10,11,12].…”