Novel nanomagnetic Ag/β-Ag2WO4/CoFe2O4 as a highly efficient photocatalyst under visible light irradiation
New Journal of Chemistry Pub Date: 2018-04-18 DOI: 10.1039/C8NJ00834E
Abstract
A visible light-driven magnetic Ag/β-Ag2WO4/CoFe2O4 nanophotocatalyst is successfully prepared using a facial method and characterized via FT-IR, XRD, SEM, EDS, VSM, DRS, BET, TEM, XPS and PL analysis. The obtained CoFe2O4 nanoparticles and Ag/β-Ag2WO4/CoFe2O4 nanocomposite exhibit a flower-like morphology and average diameter of 35 and 43 nm, respectively. The Ag/β-Ag2WO4/CoFe2O4 nanocomposite exhibits a two-fold enhancement in photocatalytic activity toward the oxidation of primary alcohols under visible light irradiation compared to that of CoFe2O4 and Ag/β-Ag2WO4. The photocatalytic efficiency of the CoFe2O4 and Ag/β-Ag2WO4 nanoparticles is 43% and 51%, respectively, whereas for Ag/β-Ag2WO4/CoFe2O4 it is 85%. This enhancement in photocatalytic activity is attributed to the effective separation of electron–hole pairs. The trapping experiment shows that ˙OH and h+ are the main species involved in the photocatalytic activity of the Ag/β-Ag2WO4/CoFe2O4 nanocomposite system. This robust and high-performance magnetic photocatalyst is recovered easily with a permanent magnet and can be reused five times without significant changes in its efficiency. Also, a radical chain mechanism is proposed.
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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