Adsorption and room temperature degradation of N-nitrosodiphenylamine on zeolites

Zhou, Chun; Yun, Zhi Yu; Xu, Yang; Wang, Yi Meng; Chen, Jia; Zhu, Jian Hua

doi:10.1039/b401004c

Cited by 35 publications

(50 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The only way for these nitrosamines to leave the zeolite is to be removed and degraded by HBr solution during the measurement process. [10] All nitrosamines, trapped in zeolite or dissolved in solution, would be detected by the spectrophotometric method, therefore, the difference between the residual and the initial amount of nitrosamines represents the portion to be converted in the microwave-induced degradation. The second, the limited energy of microwave used here could not break the N-N bond of NDPA ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…However, these arguments are not justified by the experiments. The first, microwave-induced degradation of NDPA was carried out in solution at room temperature so that the parent nitrosamines, degraded fragments, and the possible reformed nitrosamines, if any, would be trapped by zeolite because of the strong adsorptive capability of zeolite, [10] which also hindered the analysis of reaction products. The only way for these nitrosamines to leave the zeolite is to be removed and degraded by HBr solution during the measurement process.…”

Section: Discussionmentioning

confidence: 99%

“…All these zeolites and amorphous silica are commercially available powder products. [10] CAS-1 is an abundant calcium-ion zeolite-like porous material with a pore size close to that of zeolite NaA. [21] Two series of mesoporous silica samples, SBA-15 and MCM-41, were used as the adsorbents.…”

Section: Methodsmentioning

confidence: 99%

“…With two rigid phenyls connected to the N-NO functional group (Scheme 1), NDPA molecule has a large molecular size and it usually adsorbs on zeolite through the way the N-NO group inserts into the zeolite channel. [10] The N-NO bond in NDPA molecule is relatively a weak one with the bond energy of 11 kcal mol −1 , [10] so it is possibly broken by the microwave irradiation with the assistance of zeolite adsorption. To avoid the catalytic degradation of NDPA caused by acidic zeolite, [10] only basic zeolites or siliceous materials are employed to trap the nitrosamine in dichloromethane solution.…”

Section: Introductionmentioning

confidence: 99%

“…[10] The N-NO bond in NDPA molecule is relatively a weak one with the bond energy of 11 kcal mol −1 , [10] so it is possibly broken by the microwave irradiation with the assistance of zeolite adsorption. To avoid the catalytic degradation of NDPA caused by acidic zeolite, [10] only basic zeolites or siliceous materials are employed to trap the nitrosamine in dichloromethane solution. Other two nitrosamines, N -nitrosopyrrolidine (NPYR) and N -nitrosonornicotine (NNN), are also used to examine the microwave-induced degradation of volatile nitrosamines and TSNA in zeolites.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Microwave‐induced degradation of nitrosamines trapped in zeolites

Zhou

Wen

et al. 2008

Asia-Pacific J Chem Eng

Self Cite

View full text Add to dashboard Cite

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).

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microwave‐induced degradation of nitrosamines trapped in zeolites

Zhou

Wen

et al. 2008

Asia-Pacific J Chem Eng

Self Cite

View full text Add to dashboard Cite

show abstract

New Attempt to Reduce the Harm of Smoking: Reducing the Nitrosamines Level in Tobacco Smoke by Microwave Irradiation

Gao

Wang

et al. 2009

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

In order to protect the environment and public health, microwave irradiation was investigated as a means of reducing the nitrosamines level of tobacco smoke under mild conditions where the microwave energy was 1 kW and the irradiation time was shorter than 2 min. The microwave-induced elimination of nitrosamines such as Nnitrosopyrrolidine (NPYR) and N-nitrosodiphenylamine (NDPA) was investigated and the impact of the presence of water and salt in the medium on the reduction was assessed in detail. The existence of water in the medium was crucial for the microwave-induced reduction of NDPA, because the rapid movement of water molecules under the influence of microwaves strongly affects the adjacent nitrosamines leading to their decomposition. This was the first time that microwaves have been used to directly irradiate cigarettes sealed in their packaging, and the nitrosamines content of tobacco and smoke of these irradiated cigarettes were analyzed with care. Irradiation for 90 s with microwave energy of 1kW was seen to reduce 25 to 30% of the nitrosamines in tobacco and 50 to 60% of the levels present in the mainstream smoke of the cigarette. Moreover, lower mutagenic activity and higher CHO cell livability were found for the irradiated cigarettes in comparison with the control according to the results of in vitro tests.

show abstract

Electrochemical Determination of NDPhA via its Electrocatalysis at Porous Au Electrode in Room Temperature Ionic Liquid

et al. 2008

View full text Add to dashboard Cite

N-Nnitrosodiphenylamine (NDPhA) is a typical kind of nonvolatile nitrosamine. Its electrochemical oxidation occurs usually at relative positive potentials (> 1.1 V) even at catalytic noble metal electrodes in aqueous solutions. The formation of oxide and evolution of oxygen at such high potentials makes the analysis of NDPhA on noble metal electrodes difficult. Accordingly, its electrochemical analysis is usually performed in anhydrous organic electrolytes. In this work, room temperature ionic] acting as electrolyte was introduced in this electrochemical analysis systems. It acts as supporting electrolyte itself, has good solubility of organic compounds, and allows a wide performance potential window of noble electrode, and in turn, highly electrocatalytic noble electrode of platinum or gold can be used as working electrodes. After the investigation of the electrocatalytic behavior of NDPhA at a gold electrode in this room temperature ionic liquid electrolyte, high sensitive determination of NDPhA was designed. It is demonstrated that the electrochemical response of NDPhA is determined by a surfacecontrolled process. Therefore, a sensor with high sensitivity was constructed by applying porous Au electrodes with highly electrocatalytic activity and large active surface area. The present approach on one hand broadens the application field of room temperature ionic liquids, and on the other hand provides a sensitive analytical method for environmental detection.

show abstract

Adsorption and room temperature degradation of N-nitrosodiphenylamine on zeolites

Cited by 35 publications

References 30 publications

Microwave‐induced degradation of nitrosamines trapped in zeolites

Microwave‐induced degradation of nitrosamines trapped in zeolites

New Attempt to Reduce the Harm of Smoking: Reducing the Nitrosamines Level in Tobacco Smoke by Microwave Irradiation

Electrochemical Determination of NDPhA via its Electrocatalysis at Porous Au Electrode in Room Temperature Ionic Liquid

Contact Info

Product

Resources

About