Removal of carcinogens in environment: Adsorption and degradation of N′-nitrosonornicotine (NNN) in zeolites

Cao, Yi; Yun, Zhi Yu; Yang, Jing; Dong, Xinfa; Zhou, Chun; Zhuang, Ting Ting; Yu, Qing; Liu, Hua Dao; Zhu, Jian Hua

doi:10.1016/j.micromeso.2007.01.058

Cited by 41 publications

(38 citation statements)

References 27 publications

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“…When the diameter of the sorbate molecules is larger than the pore opening, it could only access the external surfaces of the porous minerals due to steric hindrance. Besides the external surface, NDMA molecules can only sorb on 4A by inserting the N-nitroso functional groups (NeN]O) inside the narrow pore channels (0.4 nm) (Cao et al, 2007), which explains its low sorption on 4A. On the other hand, sorbents with very large pore sizes also have low sorption capacities as their pore wall surfaces are essentially identical to the external surface to the sorbate molecules (Hu et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

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

Cheng

2016

Water Research

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Section: Resultsmentioning

confidence: 99%

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

Cheng

2016

Water Research

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“…To assess the ability of the sample to trap the nitrosamines in smoke, 20 cigarettes were continually smoked in a glass chamber in which citrate-phosphate buffer containing ascorbic acid (100 mL, 0.02 mol) was used to absorb the nitrosamines. [53] The solution was extracted with dichloromethane and the mean amount of the nitrosamines was determined as previously reported. [8] …”

Section: à2mentioning

confidence: 99%

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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“…The amount of N-nitrosamines degraded by NaA zeolite in the process of TPSR was also low, e. g., 14.3 lmol N g -1 for NPYR, 23.5 lmol N g -1 for NHMI, and 112.8 lmol N g -1 for NDMA. Nevertheless, NaA zeolite could strongly adsorb these N-nitrosamines so that the profile of nitrogen oxides (NOx) that formed in the degradation of N-nitrosamines as the products and were liberated at elevated temperature [6,10], had a climax temperature higher than 650 K. For the bulky NNN with a molecular size of 0.80 nm, NaA zeolite could only degrade ca. 4.5 lmol N g -1 , see Fig.…”

Section: Methodsmentioning

confidence: 99%

New Strategy to Reduce the Harmful Effects of Smoking: Reducing the Level of N‐nitrosamines in Mainstream Smoke by NaA Zeolite and In vitro and In vivo Investigations

Gao

Wang²,

et al. 2008

CLEAN Soil Air Water

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A new effort to control the pollution caused by smoking by use of zeolite sieving the N-nitrosamines in smoke is depicted and assessed in this paper, which is a first preliminary approach to demonstrate the performance characteristics of zeolite for the reduction of the concentration of N-nitrosamines in the cigarette smoke. Smoking causes global pollution and is difficult to control because smoke is a complex system containing thousands of components. A new strategy is presented here for the reduction of the harmful effects of smoking through dispersion of zeolite into the tobacco rod of cigarettes to eliminate the N-nitrosamines once they form in the smoke, and both in vitro and in vivo tests were employed to check the efficiency of this strategy. The impact of zeolite on the combustion of tobacco and the total toxicity of smoke are evaluated for the first time. Lower mutagenic activity and higher CHO cell livability were found for the test cigarette containing zeolite in comparison with the control, and no significant damage was detected in 30-day animal experiments when exposed to the cigarette smoke. This confirms the feasibility of the new strategy and promotes the potential application of zeolite for protecting public health.

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Removal of carcinogens in environment: Adsorption and degradation of N′-nitrosonornicotine (NNN) in zeolites

Cited by 41 publications

References 27 publications

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

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

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

New Strategy to Reduce the Harmful Effects of Smoking: Reducing the Level of N‐nitrosamines in Mainstream Smoke by NaA Zeolite and In vitro and In vivo Investigations

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