Catalytic activation of peroxymonosulfate with manganese cobaltite nanoparticles for the degradation of organic dyes
| Autor: | Nguyen Trung Dung, Masahito Hatsukano, Ziyi Zhong, Bui Minh Thuy, Tran Viet Thu, Koichi Higashimine, Shinya Maenosono, To Van Nguyen |
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| Rok vydání: | 2019 |
| Předmět: |
General Chemical Engineering
Radical Spinel Nanoparticle chemistry.chemical_element 02 engineering and technology General Chemistry Manganese engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Cobaltite Catalysis chemistry.chemical_compound chemistry engineering Hydrothermal synthesis 0210 nano-technology Methylene blue Nuclear chemistry |
| Zdroj: | RSC advances. 10(7) |
| ISSN: | 2046-2069 |
| Popis: | In this work, we report the facile hydrothermal synthesis of manganese cobaltite nanoparticles (MnCo2O4.5 NPs) which can efficiently activate peroxymonosulfate (PMS) for the generation of sulfate free radicals (SO4˙−) and degradation of organic dyes. The synthesized MnCo2O4.5 NPs have a polyhedral morphology with cubic spinel structure, homogeneously distributed Mn, Co, and O elements, and an average size less than 50 nm. As demonstrated, MnCo2O4.5 NPs showed the highest catalytic activity among all tested catalysts (MnO2, CoO) and outperformed other spinel-based catalysts for Methylene Blue (MB) degradation. The MB degradation efficiency reached 100% after 25 min of reaction under initial conditions of 500 mg L−1 Oxone, 20 mg L−1 MnCo2O4.5, 20 mg L−1 MB, unadjusted pH, and T = 25 °C. MnCo2O4.5 NPs showed a great catalytic activity in a wide pH range (3.5–11), catalyst dose (10–60 mg L−1), Oxone concentration (300–1500 mg L−1), MB concentration (5–40 mg L−1), and temperature (25–55 °C). HCO3−, CO32− and particularly Cl− coexisting anions were found to inhibit the catalytic activity of MnCo2O4.5 NPs. Radical quenching experiments revealed that sulfate radicals are primarily responsible for MB degradation. A reaction sequence for the catalytic activation of PMS was proposed. The as-prepared MnCo2O4.5 NPs could be reused for at least three consecutive cycles with small deterioration in their performance due to low metal leaching. This study suggests a facile route for synthesizing MnCo2O4.5 NPs with high catalytic activity for PMS activation and efficient degradation of organic dyes. |
| Databáze: | OpenAIRE |
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