Oxidation of N-nitrosodimethylamine in a heterogeneous nanoscale zero-valent iron/H<sub>2</sub>O<sub>2</sub>Fenton-like system: influencing factors and degradation pathway

Wang, Lin; Yang, Juan; Li, Yongmei; Lv, Juan; Li, Gucheng

doi:10.1002/jctb.5033

Cited by 12 publications

(7 citation statements)

References 50 publications

(105 reference statements)

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“…Similar results were reported by other researchers. 45−48 This is because anions such as nitrate, sulfate, chloride, phosphate, and bicarbonate have been reported to scavenge • OH to form less active ionic radicals (such as NO 3 • , SO 4 •– , Cl • , PO 4 •2– , and HCO 3 • /CO 3 •– ) than • OH or • O 2 – . 45−48…”

Section: Resultsmentioning

confidence: 99%

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H₂O₂ Fenton-like System

Zhang

Chen

et al. 2018

ACS Omega

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In this work, the degradation of tetracycline (TC) in water by the integrated ultrasound (US)-Fenton process was investigated. For this, a new composite Fe/N–C- x ( x is the molar ratio of iron salt Fe(NO 3 ) 3 ·9H 2 O) catalyst was synthesized through simple carbonization of the mixture of glucose and iron salt Fe(NO 3 ) 3 ·9H 2 O in the presence of ammonium chloride as the nitrogen source. The resultant catalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, vibrating sample magnetometer, and N 2 adsorption–desorption, showing a typical graphite porous structure and good magnetic properties. The results indicated that the optimized Fe/N–C-2 catalyst prepared with a mole ratio of glucose/Fe(NO 3 ) 3 ·9H 2 O/NH 4 Cl of 5:2:16.8 exhibited the highest TC removal in the Fe/N–C-2/H 2 O 2 /US system at a wide pH range from 3.0 to 11.0. At an initial pH of 7.0, TC removal in the Fe/N–C-2/H 2 O 2 /TC/US system was 1.83, 18.69, and 28.75 times of that in Fe/N–C-2/TC/H 2 O 2 , H 2 O 2 /TC/US, and TC/H 2 O 2 systems, showing a positive synergistic action between US and Fe/N–C-2. The effects of catalyst dosage, H 2 O 2 concentration, ultrasonic power, humic acid, and coexisting anions on TC removal were investigated. The preliminary analysis suggested that the Fe–N species and the graphite N dispersed in the carbon matrix are responsible for the efficient catalytic activity. By a simple magnetic separation, the Fe/N–C-2 catalyst was easily recovered and used for the next degradation experiment. Above 88% catalytic ability of Fe/N–C-2 was retained even after six successive runs, suggesting its good reusability. The simple preparation strategy, good magnetic property, and good catalytic ability of the Fe/N–C-2 materials make them promising alternative Fenton-like catalysts for the antibiotics abatement in water.

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Section: Resultsmentioning

confidence: 99%

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H₂O₂ Fenton-like System

Zhang

Chen

et al. 2018

ACS Omega

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“…With Cl − concentration increasing from 0 to 5 mmol L −1 , the removal efficiency of OTC decreased from 93.3% to 43.3% in 40 min; and the degradation rate constant decreased from 0.067 to 0.014 min −1 correspondingly. A previous study 6 indicated that Cl − would compete with • OH in the nanoscale zero‐valent iron/H 2 O 2 Fenton‐like system for the removal of NDMA. In the visible‐light‐driven SCN catalytic system, • OH is one type of ROS for the degradation of OTC.…”

Section: Resultsmentioning

confidence: 99%

“…Other instrumental parameters were set as follows: capillary voltage of 3.0 kV, cone voltage of 40 V, desolvation gas flow of 990 L h –1 , cone gas flow of 50 L h –1 , source temperature of 100 °C and desolvation temperature of 300 °C. In addition to the degradation intermediates detected using UPLC‐ESI‐MS, DMA as an important degradation intermediate was also determined during the degradation period, and it was quantified using HPLC in accordance with our previous studies 6, 29, 30 …”

Section: Methodsmentioning

confidence: 91%

“…Aliquots of 250 mL of water samples before and after photocatalytic degradation reaction (reaction conditions: SCN dose = 1.0 g L −1 , OTC concentration = 10 mg L −1 and initial pH = 7.0) were collected and exposed to monochloramine for 10 days. The procedures and chloramination reaction conditions were in accordance with our previous studies 6, 29, 30 …”

Section: Methodsmentioning

confidence: 99%

“…As is well known, NDMA is an emerging disinfection byproduct generated during water or wastewater chloramination or chlorination in the presence of ammonia 5 . The most effective method to control NDMA formation during the disinfection process is to enhance the removal of its potential precursors 6 . However, there are still some challenges for the removal of these kinds of precursors (like TCs), because most of them are recalcitrant.…”

Section: Introductionmentioning

confidence: 99%

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Green synthesis of sulfur‐doped g‐C₃N₄ nanosheets for enhanced removal of oxytetracycline under visible‐light irradiation and reduction of its N‐nitrosodimethylamine formation potential

Dou

Shen

Zou

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND In this study, sulfur‐doped g‐C3N4 (SCN) nanosheets were synthesized using thiourea as a precursor, and then used to catalyze the degradation of oxytetracycline (OTC) under visible‐light irradiation. OTC was chosen as target contaminant because of it being an important precursor of N‐nitrosodimethylamine (NDMA). RESULTS The removal of OTC was influenced by its initial concentration, initial pH, SCN dosage and water matrices. OTC (≤10 mg L−1) was almost completely removed in 40 min under the conditions of an initial pH of 7.0 and a SCN dose of 1.0 g L−1, and its degradation was well described by the pseudo‐first‐order kinetics model. Water matrices would also influence the degradation of OTC in the system. Electron paramagnetic resonance analysis and trapping experiments confirmed that the function of the radicals for OTC removal followed the order of •O2− > •OH > h+. Eight transformation products were determined during the degradation of OTC, it being removed through four pathways: methyl oxidization, demethylation, decarbonylation and secondary alcohol oxidation. SCN was stable in the system, as the removal efficiency of OTC was not significantly reduced even after three recycles. In addition, 55.5% of NDMA formation potential of OTC was reduced after SCN catalytic oxidation. CONCLUSIONS The results imply that the visible‐light‐driven SCN catalytic oxidation is an effective technology not only for the removal of OTC but also for the reduction of NDMA formation potential. © 2021 Society of Chemical Industry

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Preparation and characterization of antifouling and antibacterial polysulfone ultrafiltration membranes incorporated with a silver–polydopamine nanohybrid

Liu

Huang

et al. 2018

J of Applied Polymer Sci

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A silver–polydopamine (Ag–PDA) nanohybird was used to produce polysulfone (PSf) ultrafiltration membranes with excellent antifouling and antibacterial properties. First, the catechol functional groups of polydopamine (PDA) helped with the in situ immobilization of silver (Ag) nanoparticles (<10 nm) on the PDA sphere surface; this led to the formation of the Ag–PDA nanohybrid. Then, Ag–PDA/PSf hybrid membranes were prepared via the phase‐inversion method, and the influence of Ag–PDA loading on the hybrid membrane properties was systematically investigated. When the content of Ag–PDA was 0.5 wt %, the hybrid membrane achieved optimal separation performance, including a dramatically increased pure water flux and a well‐maintained bovine serum albumin rejection. Furthermore, the Ag–PDA/PSf hybrid membranes presented a significantly enhanced protein‐fouling resistance and a good antibacterial activity. These improvements were attributed to the unique structure and properties of the Ag–PDA nanohybrid because of the synergistic effect of the hydrophilic PDA substrate and well‐distributed Ag nanoparticles. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46430.

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

Abstract: BACKGROUND: N-nitrosodimethylamine (NDMA) is an emerging disinfection

Cited by 12 publications

References 50 publications

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H₂O₂ Fenton-like System

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H₂O₂ Fenton-like System

Green synthesis of sulfur‐doped g‐C₃N₄ nanosheets for enhanced removal of oxytetracycline under visible‐light irradiation and reduction of its N‐nitrosodimethylamine formation potential

Preparation and characterization of antifouling and antibacterial polysulfone ultrafiltration membranes incorporated with a silver–polydopamine nanohybrid

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

Abstract: BACKGROUND: N-nitrosodimethylamine (NDMA) is an emerging disinfection

Cited by 12 publications

References 50 publications

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H2O2 Fenton-like System

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H2O2 Fenton-like System

Green synthesis of sulfur‐doped g‐C3N4 nanosheets for enhanced removal of oxytetracycline under visible‐light irradiation and reduction of its N‐nitrosodimethylamine formation potential

Preparation and characterization of antifouling and antibacterial polysulfone ultrafiltration membranes incorporated with a silver–polydopamine nanohybrid

Contact Info

Product

Resources

About

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

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H₂O₂ Fenton-like System

Ultrasound-Assisted Removal of Tetracycline by a Fe/N–C Hybrids/H₂O₂ Fenton-like System

Green synthesis of sulfur‐doped g‐C₃N₄ nanosheets for enhanced removal of oxytetracycline under visible‐light irradiation and reduction of its N‐nitrosodimethylamine formation potential