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Title
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Enhanced Visible-Light-Induced Photocatalytic Activity in M(III)Salophen-Decorated TiO2 Nanoparticles for Heterogeneous Degradation of Organic Dyes
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Type
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JournalPaper
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Keywords
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M(III)Salophen; TiO2; Degradation of Organic Dyes, Visible-Light-Induced Photocatalytic Activity
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Abstract
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In this work, the construction of two heterojunction photocatalysts by coordinative anchoring of M(salophen)Cl complexes (M = Fe(III) and Mn(III)) to rutile TiO2 through a silica−aminopyridine linker (SAPy) promotes the visible-light-assisted photodegradation of organic dyes. The degradation efficiency of both cationic rhodamine B (RhB) and anionic methyl orange (MO) dyes by Fe− and Mn−TiO2-based catalysts in the presence of H2O2 under sunlight and low-wattage visible bulbs (12−18 W) is investigated. Anionic MO is more degradable than cationic RhB, and the Mn catalyst shows more activity than its Fe counterpart. Action spectra demonstrate the maximum apparent quantum efficiency (AQY) at 400−450 nm, confirming the visible-light-driven photocatalytic reaction. The enhanced photocatalytic activity might be attributed to the improved charge transfer in the heterojunction photocatalysts evidenced by photoluminescence (PL) and electrochemical impedance spectroscopy (EIS) analyses. A radical pathway for the photodegradation of dyes is postulated based on scavenging experiments and spectral data. This work provides new opportunities for constructing highly efficient catalysts for wastewater treatment.
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Researchers
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Hualin Jiang (Not In First Six Researchers), Pinghua Chen (Fifth Researcher), M J (Fourth Researcher), Narges Keikha (Third Researcher), Masoumeh Rezaei (Second Researcher), A R (First Researcher)
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