Degradation of diazinon by new hybrid nanocomposites N-TiO2/Graphene/Au and N-TiO2/Graphene/Ag using visible light photo-electro catalysis and photo-electro catalytic ozonation: Optimization and comparative study by Taguchi method
| Autor: | Baharak Ayoubi-Feiz, Mohammad Hossein Mashhadizadeh, Mohsen Sheydaei |
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| Rok vydání: | 2019 |
| Předmět: |
Nanocomposite
Diazinon Materials science Graphene Filtration and Separation 02 engineering and technology 021001 nanoscience & nanotechnology Analytical Chemistry Catalysis law.invention chemistry.chemical_compound Electrophoretic deposition 020401 chemical engineering chemistry Chemical engineering law Electrode Degradation (geology) 0204 chemical engineering 0210 nano-technology Visible spectrum |
| Zdroj: | Separation and Purification Technology. 211:704-714 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2018.10.032 |
| Popis: | A series of nitrogen doped TiO2/Graphene/Au (N-TiO2/G/Au) and nitrogen doped TiO2/Graphene/Ag (N-TiO2/G/Au) modified nanocomposite electrodes were prepared by a simple electrophoretic deposition method to assess their visible light photo-electro catalytic and photo-electro catalytic ozonation activities against diazinon. The structural and morphological analyses of the synthesized composites were made by XRD, SEM and EDX while the optical properties were studied by DRS technique. The effect of Au and Ag ratio to N-TiO2, Na2SO4 concentration, voltage and initial pH of the solution was optimized by Taguchi method on the degradation of diazinon using photo-electro catalytic process. High degradation 76.7% for N-TiO2/G/Au and 81.1% for N-TiO2/G/Ag was observed when Au and Ag ratio to N-TiO2 was 0.2 wt%, Na2SO4 concentration = 56 mM, voltage = 900 mV and pH = 6 after 60 min visible light irradiation. The main intermediates of diazinon degradation were identified using GC-MS spectrometry. Finally, the visible light photo-electro catalytic ozonation of diazinon using optimized nanocomposites were studied. The results demonstrate that the photo-electro catalytic ozonation highly enhanced the degradation rate of diazinon (nearly 100%) compared to photo-electro catalytic and ozonation processes, solely. Also, nanocomposites showed good catalytic activities even after seven successive degradation cycles. |
| Databáze: | OpenAIRE |
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