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

He, Yuanzhen; Cheng, Hefa

doi:10.1016/j.watres.2016.02.065

Cited by 33 publications

(7 citation statements)

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“…The formation of acetaldehyde could be attributed to the combination of formaldehyde and unoxidized •CH 3 . A similar reaction was confirmed when NDMA was degraded in the mineral micropores induced microwave irradiation system …”

Section: Resultssupporting

confidence: 66%

Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H₂O₂Fenton-like system: influencing factors and degradation pathway

Wang

Yang

et al. 2016

J. Chem. Technol. Biotechnol

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Section: Resultssupporting

confidence: 66%

Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H₂O₂Fenton-like system: influencing factors and degradation pathway

Wang

Yang

et al. 2016

J. Chem. Technol. Biotechnol

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“…We measured chlorophenol sorption on CBV-720 based on triplicated experiments in the preliminary study. The relative standard deviation (RSD) values were found to be less than 5 % in general for the sorption capacities (Table S1), which is consistent with the results of atrazine and N-nitrosodimethylamine sorption on dealuminated zeolites conducted in our group Hu and Cheng 2013;He and Cheng 2016). To reduce the workload, triplicates were skipped for the rest of the experiments, while comparable reproducibility was expected for the results of all sorption experiments, which is supported by the good R 2 values (0.92-1.00) for the sorption isotherms (Table S2).…”

Section: Methodssupporting

confidence: 87%

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Yang

Cheng

2016

Environ Sci Pollut Res

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Sorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) on a range of dealuminated zeolites were investigated to understand the mechanism of their sorption on microporous minerals, while the influence of common metal cations, solution pH, and humic acid was also studied. Sorption of chlorophenols was found to increase with the hydrophobicity of the sorbates and that of the microporous minerals, indicating the important role of hydrophobic interactions, while sorption was also stronger in the micropores of narrower sizes because of greater enhancement of the dispersion interactions. The presence of metal cations could enhance chlorophenol sorption due to the additional electrostatic attraction between metal cations exchanged into the mineral micropores and the chlorophenolates, and this effect was apparent on the mineral sorbent with a high density of surface cations (2.62 sites/nm 2 ) in its micropores. Under circum-neutral or acidic conditions, neutral chlorophenol molecules adsorbed into the hydrophobic micropores through displacing the Bloosely bound^water molecules, while their sorption was negligible under moderately alkaline conditions due to electrostatic repulsion between the negatively charged zeolite framework and anionic chlorophenolates. The influence of humic acid on sorption of chlorophenols on dealuminated Y zeolites suggests that its molecules did not block the micropores but created a secondary sorption sites by forming a Bcoating layer^on the external surface of the zeolites. These mechanistic insights could help better understand the interactions of ionizable chlorophenols and metal cations in mineral micropores and guide the selection and design of reusable microporous mineral sorbents for sorptive removal of chlorophenols from aqueous stream.

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“…When water molecules desorbed from the hydration shells of cations, a part of microwave energy was consumed. Thus, it resulted in the reduced microwave energy for formation of "hot spots" (He &Cheng 2016, Hu &Cheng 2013. However, the addition of several other cations led to the increase of the removal rate of methyl orange to varying degrees.…”

Section: Effects Of Ionsmentioning

confidence: 99%

Microwave-Assisted High-Efficiency Degradation of Methyl Orange by using CuFe2O4/CNTs Catalysts and Insight into Degradation Mechanism

Liu

Zhang

Liang

et al. 2021

Preprint

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Microwave-assisted catalytic oxidation technology has become an effective technology for rapid removal of organic pollutants in wastewater. In this research, the removal of methyl orange from aqueous solution by CuFe2O4 loaded on carbon nanotubes (CuFe2O4/CNTs) under microwave irradiation was studied. The effects of different loadings (1:2, 1:4, 1:8) of CuFe2O4 on the dielectric loss, magnetic loss, dielectric loss factor, magnetic loss factor and reflection loss of composite materials were studied. The results showed that the microwave adsorption performance was improved by loading CuFe2O4 on CNTs. These different composites were further characterized by SEM, FTIR and XRD techniques. In addition, this article also studied the effects of different microwave irradiation time, pH, and ionic factors on the degradation of methyl orange. In particular, the mechanism of methyl orange degradation by composite materials under different pH conditions was also studied in detail. The results show that the removal rate reaches 97.16% with 5 min under the best conditions, and the composite material has good anti-interference performance. This study may provide a new option to degrade organic dye in wastewater treating.

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

Cited by 33 publications

References 50 publications

Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H₂O₂Fenton-like system: influencing factors and degradation pathway

Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H₂O₂Fenton-like system: influencing factors and degradation pathway

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Microwave-Assisted High-Efficiency Degradation of Methyl Orange by using CuFe2O4/CNTs Catalysts and Insight into Degradation Mechanism

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

Cited by 33 publications

References 50 publications

Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H2O2Fenton-like system: influencing factors and degradation pathway

Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H2O2Fenton-like system: influencing factors and degradation pathway

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Microwave-Assisted High-Efficiency Degradation of Methyl Orange by using CuFe2O4/CNTs Catalysts and Insight into Degradation Mechanism

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Product

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Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H₂O₂Fenton-like system: influencing factors and degradation pathway

Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H₂O₂Fenton-like system: influencing factors and degradation pathway