Strong Pyro-Electro-Chemical Coupling of Elbaite/H<sub>2</sub>O<sub>2</sub> System for Pyrocatalysis Dye Wastewater
Elbaite is a natural silicate mineral with a spontaneous electric field. In the current study, it was selected as a pyroelectric catalyst to promote hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) for dye decomposition due to its pyro-electro-chemical coupling. The behaviors a...
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| Auteurs principaux: | , , , , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
MDPI AG
2021
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| Accès en ligne: | https://doaj.org/article/e339c40f60ca4559abec66cd70d2deed |
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| Résumé: | Elbaite is a natural silicate mineral with a spontaneous electric field. In the current study, it was selected as a pyroelectric catalyst to promote hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) for dye decomposition due to its pyro-electro-chemical coupling. The behaviors and efficiency of the elbaite/H<sub>2</sub>O<sub>2</sub> system in rhodamine B (RhB) degradation were systematically investigated. The results indicate that the optimal effective degradability of RhB reaches 100.0% at 4.0 g/L elbaite, 7.0 mL/L H<sub>2</sub>O<sub>2</sub>, and pH = 2.0 in the elbaite/H<sub>2</sub>O<sub>2</sub> system. The elbaite/H<sub>2</sub>O<sub>2</sub> system exhibits high recyclability and stability after recycling three times, reaching 94.5% of the degradation rate. The mechanisms of RhB degradation clarified that the hydroxyl radical (·OH) is the main active specie involved in catalytic degradation in the elbaite/H<sub>2</sub>O<sub>2</sub> system. Moreover, not only does elbaite act as a pyroelectric catalyst to activate H<sub>2</sub>O<sub>2</sub> in order to generate the primary ·OH for subsequent advanced oxidation reactions, but it also has the role of a dye sorbent. The elbaite/H<sub>2</sub>O<sub>2</sub> system shows excellent application potential for the degradation of RhB. |
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