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Highly active WO@anatase-SiO aerogel for solar-light-driven phenanthrene degradation: Mechanism insight and toxicity assessment.

08:00 EDT 28th June 2019 | BioPortfolio

Summary of "Highly active WO@anatase-SiO aerogel for solar-light-driven phenanthrene degradation: Mechanism insight and toxicity assessment."

The global energy crisis and water pollution drive the researchers to develop highly effective and less energy intensive water purification technologies. In this study, a highly active WO@TiO-SiO nanocomposite was synthesized and used for photocatalytic degradation of persistent organic pollutants under simulated solar light. The optimum WO@TiO-SiO prepared with 2 wt% WO loading and calcination at 800 °C exhibited higher photocatalytic activity, as the rate constant (k) for phenanthrene degradation was ∼7.1 times of that for the commercial TiO (P25). The extremely large specific surface area (>400 m/g) of WO@TiO-SiO afforded it with enlarged pollutants adsorption performance and abundant active surface sites. The heterojunction of anatase with SiO as well as loading of WO decreased the band gap energy (E) of TiO, which extended the utilization spectrum of TiO to visible region. Formation of Ti-O-Si band indicated the excess charges can cause Brønsted acidity due to the absorption of protons to compensate the charges. Moreover, the migration of photo-excited electrons from the conduction band of anatase to WO and holes in the opposite direction restrained the electron-hole recombination. The photocatalytic degradation mechanism and pathway for phenanthrene degradation were proposed based on experimental analysis and density functional theory (DFT) calculation, and the toxicities of the degradation intermediates were evaluated by quantitative structure-activity relationship (QSAR) analysis. WO@TiO-SiO also showed good separation (settling) performance and high stability. Our work is expected to offer new insight into the photocatalytic mechanism for WO, TiO and SiO based heterojunctions, and rational design and synthesis of highly efficient photocatalysts for environmental application.

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This article was published in the following journal.

Name: Water research
ISSN: 1879-2448
Pages: 369-382

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