The Synthesis of Novel Porous Functional Materials for use as Nitrosamine Traps

Xu, Yang; Jiang, Qi; Cao, Yi; Yi, Wei; Yun, Zhi Yu; Xu, Jia; Wang, Ying; Zhou, Chun; Shi, Li; Zhu, Jian Hua

doi:10.1002/adfm.200400009

Cited by 45 publications

(32 citation statements)

References 38 publications

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“…As the amount of zirconia coating increased, both the BET surface area and pore volume of the resulting composites decreased progressively (Table 1) because the guest mainly coated the inner surface of the host, as revealed previously. [9] Low-angle XRD patterns (Figure 3 A) demonstrate that after impregnation of zirconia, the mesoporous materials kept the original order of M2S1, onto which three well-resolved peaks with high intensity are indexed as P6mm. As the amount of zirconia rose from 1 to 10 % (w/w), the intensity of the (100) peak progressively declined, in a similar manner to the reported CuO/SBA-15 sample from a onepot synthesis, [9] but the decrease in intensity of our samples may have been because of the change in X-ray scattering rather than weakening of the mesoporous order from the introduction of the metal oxide.…”

Section: à3mentioning

confidence: 98%

“…Tobacco smoke consists of more than 4000 individual components in the vapor and particulate phases; [7] therefore, it is difficult to capture a target such as nitrosamines that are well known as strong carcinogens. [7,8] Because of their unique selective adsorption abilities, zeolite and modified mesoporous silica can effectively capture volatile nitrosamines in smoke, [8][9][10] but these ordered porous materials are hardly able to specifically trap tobacco-smoke nitrosamine, another type of strong carcinogen that exists in the particles suspended in smoke, because these particles are usually micrometers in size, [7] thus exceeding the pore size of these adsorbents, which is in the nanometer range.…”

Section: Introductionmentioning

confidence: 99%

“…Common SBA-15 cannot trap nitrosamines in smoke for two reasons: 1) the geometric limitation of the mesoporous channels for the tobacco-specific nitrosamines exists in particles that are micrometers in size, as mentioned previously; [7] 2) the lack of cations to provide strong adsorptive sites for volatile nitrosamines in the vapor phase of smoke. [9] The smoke of Chinese Virginia-type cigarettes mainly contains volatile nitrosamines, [10] therefore, the 3D net-linked M2S1 cannot efficiently decrease the level of nitrosamines in smoke either because of its pure siliceous composition. On the contrary, 5 % ZrO 2 /M2S1 showed an excellent ability to remove about 37 % of the nitrosamines from mainstream smoke.…”

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confidence: 99%

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Functional Mesoporous Material Derived from 3D Net‐Linked SBA‐15

Zhou

Gao

et al. 2009

Chemistry A European J

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A novel, versatile functional mesoporous material with the structure of SBA-15 but a specific 3D net-linked morphology has been prepared by using a facile method. This material has been assessed for its ability to reduce the level of nitrosamines in tobacco smoke so that the actual effect of this material in the reduction of carcinogenic environmental pollutants in a complex chemical system can be verified. By adjusting the force field during the hydrolysis and condensation processes of tetramethyl orthosilicate (TMOS) in an aqueous reaction system, the SBA-15 silica, which has a special morphology in that it is long and fiberlike from a microscopic view but large and block-like from a macroscopic angle, has been successfully synthesized. Moreover, the synthetic product is no longer a powder but a block because of its specific 3D net-linked morphology, which enables the material not only to trap particles in smoke but also to potentially be applied as a device. To strengthen the adsorptive capability of this porous material, a dry-impregnation procedure was applied in which zirconia was coated on the silica wall without changing the morphology. As expected, this functional material shows a high activity in the adsorption of N'-nitrosonornicotine (NNN), a bulky tobacco-specific nitrosamine, in solution and of N-nitrosopyrrolidine (NPYR), a volatile nitrosamine, in the gas stream. Furthermore, this 3D net-linked SBA-15 material can efficiently decrease the amount of nitrosamines and total number of particles in mainstream smoke when it is tested as an additive in the filter of a cigarette, thus providing powerful protection for the environment and public health.

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Section: à3mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Functional Mesoporous Material Derived from 3D Net‐Linked SBA‐15

Zhou

Gao

et al. 2009

Chemistry A European J

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“…[10,12] Adsorption of NDPA in zeolite limited the movement of the adsorbate, meanwhile the interaction between the channel wall and the nitrosamine anchored the molecule. (Scheme 2), which realized the rupture of N-NO bond by microwave irradiation.…”

Section: Discussionmentioning

confidence: 99%

“…[12] Two grams of triblock copolymer P123 (EO 20 2 O, where X is 0.034, 0.10, 0.17, and 0.34 for preparation of sample with the mass percentages of CuO as 1, 3, 5, and 10 mass percent, respectively. The solution was stirred for 24 h at 313 K and heated at 373 K for another 24 h under static condition.…”

Section: Methodsmentioning

confidence: 99%

Microwave‐induced degradation of nitrosamines trapped in zeolites

Zhou

Wen

et al. 2008

Asia-Pacific J Chem Eng

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A new method is reported for the degradation of nitrosamines trapped by zeolites. Significant amount of N -nitrosodiphenylamine (NDPA) in dichloromethane solution, up to one-third, could be degraded by microwave within 1 min once they were adsorbed by zeolite. The nitrosamine molecule, resulting from the electrostatic interaction between the N-NO group of NDPA and the cation of zeolite, could be partially anchored inside the channel of zeolite depending on the degree of structure matching between the adsorbent and the adsorbate. Anchoring of nitrosamines limited their movement so that they were degraded by microwave irradiation. Mesoporous SBA-15 and amorphous silica in solution could also promote the microwave-induced degradation of NDPA, owing to the interaction between the surface Si-OH and the N-NO group of NDPA, and introducing copper oxide increased the conversion of NDPA. In addition, the influence of pore structure of zeolite on the microwave-induced degradation of volatile nitrosamines was examined and discussed, and NaA exhibits a stronger adsorption than NaY for N -nitrosopyrrolidine (NPYR).

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Multiple Functionalization of Mesoporous Silica in One‐Pot: Direct Synthesis of Aluminum‐Containing Plugged SBA‐15 from Aqueous Nitrate Solutions

Wang

Zhuang

et al. 2007

Adv Funct Materials

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Aluminum‐containing plugged mesoporous silica has been successfully prepared in an aqueous solution that contains triblock copolymer templates, nitrates, and silica sources but without using mineral acid. The acidity of the solution can be finely tuned from pH 1.4 to 2.8 according to the amount of the introduced aluminum species which ranged from an Al/Si molar ratio of 0.25/1 to 4.0/1. The aluminum nitrate additive in the starting mixture, along with the weak acidity produced by the nitrates, contributes to the formation of plugged hexagonal structures and the introduction of different amounts of aluminum species into the mesostructure. Characterization by X‐ray diffraction, transmission electron microscopy, and N2 sorption measurements show that the Al‐containing plugged silicas possess well‐ordered hexagonal mesostructures with high surface areas (700–860 m2 g–1), large pore volume (0.77–1.05 cm3 g–1) and, more importantly, combined micropores and/or small mesopores in the cylindrical channels. Inductively coupled plasma–atomic emission spectrometry results show that 0.7–3.0 wt % aluminum can be introduced into the final samples. 27Al MAS NMR results display that about 43–60% aluminum species are incorporated into the skeleton of the Al‐containing silicas and the amount of the framework aluminum increases as the initial added nitrates rises. Scanning electron microscopy images reveal that the directly synthesized Al‐containing plugged silica has a similar morphology to that of traditional SBA‐15. Furthermore, the Al‐containing plugged samples have excellent performances in the adsorption and the catalytic decomposition of isopropyl alcohol and nitrosamine. Finally, the direct synthesis method is used to produce plugged mesoporous silicas that contain other metals such as chromium and copper, and the resultant samples also show good catalytic activities.

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The Synthesis of Novel Porous Functional Materials for use as Nitrosamine Traps

Cited by 45 publications

References 38 publications

Functional Mesoporous Material Derived from 3D Net‐Linked SBA‐15

Functional Mesoporous Material Derived from 3D Net‐Linked SBA‐15

Microwave‐induced degradation of nitrosamines trapped in zeolites

Multiple Functionalization of Mesoporous Silica in One‐Pot: Direct Synthesis of Aluminum‐Containing Plugged SBA‐15 from Aqueous Nitrate Solutions

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