Abstract
In this paper, defective TiO2 with catalytic activity under no visible light conditions was prepared. As a templating agent, deep eutectic solvent (DES) was produced using choline chloride and glycerol (ChCl/G), and a series of DES-TiO2 photocatalysts were synthesized utilizing the sol–gel method to study the effect of DES dosage on TiO2. The results indicate that the optimal catalytic performance of TiO2 is achieved with a DES:Ti(M) ratio of 2.0. The X-ray photoelectron spectroscopy (XPS) tests and Electron spin resonance spectroscopy (EPR) of the samples showed the presence of a large number of oxygen defects in the lattice of TiO2. The Ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS) analysis and photocatalytic degradation experiments of the samples showed that the response range to light was expanded to include the visible and near-infrared spectrum in addition to the UV spectrum. The photocatalytic degradation rate of 20 mg/L methylene blue reached 88.8 % within 2 h, which was 4.96 times higher than pure TiO2 and much higher than a commercially available P25 catalyst with good cycling stability.
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