Abstract
Summary of main observation and conclusionThe AL‐P25 composites (AL = alizarin, P25 = nano titanium dioxide) with oxygen vacancies were synthesized by a simple hydrothermal method and applied for the photoreduction of Cr(VI) under visible light. The AL‐P25 composites were characterized by scanning electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy analysis, Fourier transform infrared spectrometer, thermo‐gravimetric analysis, UV–vis diffuse reflectance spectroscopy, photoluminescence spectroscopy and electron paramagnetic resonance spectroscopy. The results suggested that the AL‐P25 composites were successfully prepared, and alizarin was linked to P25 via Ti—O—C bonds. AL‐P25 composites represented excellent photoreduction efficiency on Cr(VI) under visible light, which was 99.4% after 60 min of illumination. Finally, a photocatalytic mechanism of AL‐P25 composites was proposed that ligand‐metal charge transfer (LMCT) process between alizarin and P25 effectively enhances separation efficiency of photogenerated electrons and holes.
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