Simultaneously enhanced degradation of N, N-dimethylacetamide and reduced formation of iron sludge by an efficient electrolysis catalyzed ozone process in the presence of dissolved silicate

Xiong, Zhaokun; Li, Jiayi; Li, You; Yuan, Yue; Jiang, Yanni; Yao, Gang; Lai, Bo

doi:10.1016/j.jhazmat.2020.124725

Cited by 25 publications

(4 citation statements)

References 49 publications

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“…Thus, the repolarization process can form numerous tiny electrolytic cells, and further contribute to the electrochemical oxidation efficiency. Meanwhile, the amount of H 2 O 2 produced by the cathode also increased due to the increase in mass transfer rate between electrons [ 47 ], which resulted in a large increase in ·OH and the regeneration of catalyst supported on the carbon-based particle electrode. Ultimately, the removal efficiency of metronidazole improved.…”

Section: Resultsmentioning

confidence: 99%

“…However, a further increase in the O 3 aeration rate reduced the enhancement in the degradation effect. This result may be due to the excess O 3 reducing the conductivity of solution [ 47 ] or bubbles generated from excessive aeration leading to insufficient contact between the solution and the anode and/or particle electrode, which slowed down the process of the reaction. The experimental data were fitted by pseudo-first-order dynamics, and the parameter results are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Shen et al [ 54 ] also reported that ·O 2 − was the reactive oxygen radical generated in Mg-doped ZnO catalytic ozonation. ·OH and ·O 2 − were generally generated from the radical chain reactions of the decomposition of ozone and H 2 O 2 that generated in situ on cathode as follows [ 47 ]:

…”

Section: Resultsmentioning

confidence: 99%

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Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

et al. 2022

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A novel material of self-shaped ZnO-embedded biomass carbon foam pellets (ZnO@BCFPs) was successfully synthesized and used as fluidized particle electrodes in three-dimensional (3D) electro-peroxone systems for metronidazole degradation. Compared with 3D and 2D + O3 systems, the energy consumption was greatly reduced and the removal efficiencies of metronidazole were improved in the 3D + O3 system. The degradation rate constants increased from 0.0369 min−1 and 0.0337 min−1 to 0.0553 min−1, respectively. The removal efficiencies of metronidazole and total organic carbon reached 100% and 50.5% within 60 min under optimal conditions. It indicated that adding ZnO@BCFPs particle electrodes was beneficial to simultaneous adsorption and degradation of metronidazole due to improving mass transfer of metronidazole and forming numerous tiny electrolytic cells. In addition, the process of metronidazole degradation in 3D electro-peroxone systems involved hydroxyethyl cleavage, hydroxylation, nitro-reduction, N-denitrification and ring-opening. The active species of ·OH and ·O2− played an important role. Furthermore, the acute toxicity LD50 and the bioconcentration factor of intermediate products decreased with the increasing reaction time.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

et al. 2022

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“…DMAc (C 0 = 200 mg/L) was removed by 95.4% in water solution with a reaction rate constant k = 0.0258 min −1 using CuFe 2 O 4 /O 3 catalyzed-ozone process (Zhang et al 2018). In the electrolysis catalyzedozone process of ECO-Na 2 SiO 3 /Fe/O 3 , the rate constant increased to k = 0.112 min −1 in degradation reaction of DMAc compound in water (Xiong et al 2021).…”

Section: Introductionmentioning

confidence: 98%

Synthesis of CuxCo3−xO4 nanocatalyst for degradation of nitrogenous organic wastewater in Fenton-like membrane reactor

Zhou

Chen

et al. 2022

Appl Water Sci

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Membrane Fenton-like process with cobalt–copper spinel catalyst is proposed to degrade nitrogenous organic hazardous in wastewater. Cu-auxiliary cobalt oxide (CuxCo3–xO4) was synthesized with the dispersion co-precipitation method. As-prepared CuCo2O4 performed as the best catalyst for Fenton degradation on nitrogen-containing organic compound as methylene blue (C16H18N3ClS) in water and N,N-dimethylacetamide [CH3CON(CH3)2] in industrial wastewater. Lattice substation of Cu2+ to Co2+ ion increased the oxygen vacancies and catalytic activity. The catalyst stability was improved owing to hybrid polarization confinement (total metal elution less than 0.8 mg/L). Methylene blue in water (C0 = 100 mg/L) was completely decolorized in 50 min using 0.6 g/L CuCo2O4 and 0.09 M H2O2 at intrinsic pH 6.7. Degradation reaction rate constant was increased by two folds as k = 0.076 min−1 catalyzed by CuCo2O4 over k = 0.039 min−1 by Co3O4. DMAc-contaminant wastewater of high CODs 19,080 mg/L was treated using 2.4 g/L CuCo2O4 and 2.4 M H2O2 at intrinsic pH = 7.6. Removal rate of DMAc was enhanced from 81 to 99% in the ceramic membrane reactor when H2O2 was activated, and self-sweeping effect was suppressed. As a result, Total Organic Nitrogen (2900 mg/L) in the wastewater was mineralized by 99.9% with a fast transformation to inorganic NO3− ion. Biodegradability of the resistant organic wastewater was remarkably improved, and BOD/COD was increased by 18 folds.

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The effect of crystal structure of MnO2 electrode on DMAC removal: degradation performance, mechanism, and application evaluation

Hu,

Zhou,

Liu

et al. 2024

Environ Sci Pollut Res

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Simultaneously enhanced degradation of N, N-dimethylacetamide and reduced formation of iron sludge by an efficient electrolysis catalyzed ozone process in the presence of dissolved silicate

Cited by 25 publications

References 49 publications

Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

Synthesis of CuxCo3−xO4 nanocatalyst for degradation of nitrogenous organic wastewater in Fenton-like membrane reactor

The effect of crystal structure of MnO2 electrode on DMAC removal: degradation performance, mechanism, and application evaluation

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