Abstract
TiO2 exposed high energy crystal plane (001) was prepared by the sol-gel process using butyl titanate as the titanium source and hydrofluoric acid as the surface control agent. Ag-TiO2 was prepared by depositing Ag on the crystal plane of TiO2 (101) with a metal halide lamp. The surface morphology, interplanar spacing, crystal phase composition, ultraviolet absorption band, element composition, and valence state of the samples were characterized by using field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectrum (UV-Vis-Abs), and X-ray photoelectron spectroscopy (XPS), respectively. The formation mechanism of high energy crystal plane (001) was discussed, and the photocatalytic activities were evaluated by following degradation of methyl orange. The results show that TiO2 exposed the (001) crystal plane with a ratio of 41.8%, and Ag can be uniformly deposited on the crystal plane of TiO2 (101) by means of metal halide lamp deposition. Under the same conditions, the degradation rate of methyl orange by deposited Ag-TiO2 reaches as much as 93.63% after 60 min using the metal halide lamp (300 W) as an illuminant, 81.89% by non-deposited samples and 75.20% by nano-TiO2, causing a certain blue shift in the light absorption band edge of TiO2. Ag-TiO2 has the best photocatalytic performance at a pH value of 2.
Highlights
The main pollutants in water pollution are inorganic and organic pollutants
The high energy crystal plane TiO2 prepared in Section 2.1 (0.5 g) was dispersed in AgNO3 solution placed in a quartz tube (30 mL), in which the mass ratio of Ag to TiO2 was 1%
The results show that high energy crystalline surface titanium dioxide particles have been prepared successfully
Summary
The main pollutants in water pollution are inorganic and organic pollutants. At present, in terms of the treatment for organic pollutants in sewage, the main methods include electrocatalytic technology [1], electrochemical anodic oxidation [2], surface adsorption [3], and photocatalysis [4]. In the photocatalytic reactions, photogenerated electrons tend to transfer to the (101) crystal plane with lower energy, and accumulating on (101), while photogenerated holes tend to accumulate on (001) crystal plane with a high energy This feature can effectively promote the separation of photogenerated electron hole pairs, thereby improving their photocatalytic performance [32]. Noble metal deposition modification is achieved by changing the electronic distribution and the surface properties of TiO2 , so as to reduce the forbidden band width of TiO2 , increase its light-sensitive wavelength, and improve the utilization rate of sunlight [22]. The photocatalytic properties of the samples were studied, which provided a reference for sewage treatment
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