Preparation method for modified nano titanium dioxide suitable for lighting condition of road tunnel

Abstract

The invention relates to a preparation method for modified nano titanium dioxide (TiO2) suitable for a lighting condition of a road tunnel, belongs to the technical field of tunnel pollution treatment, and solves the problem that TiO2 is low in optical catalytic efficiency under lighting waveform and strength of the tunnel. The method comprises: firstly analyzing an optical catalytic mechanism of TiO2 and then determining the preparation method; then selecting iron ions as a modifier, preparing nano TiO2 by using a sol-gel method; by taking butyl titanate as a precursor and ferric nitrate nonahydrate as a ferric ion doping source, stirring the mixture by virtue of a constant temperature magnetic stirrer to prepare a light yellow sol; drying the aged sol in an electric heating constant temperature air dry oven to prepare a dried gel; and finally, calcining the dried gel in a muffle furnace to prepare ferric ion-doped modified TiO2. The optimum doping amount of ferric ions for modifying TiO2 is determined according to test results and optical catalytic degradation experimental effects of an X-ray diffractometer, a transmission electron microscope, an ultraviolet visible light diffuse reflection instrument and an X-ray electron spectrum analyzer, so as to be fit for the lighting condition of the tunnel, so that the TiO2 light absorptivity and optical catalytic activity are improved, and the tail gas concentration of an automobile in the tunnel is reduced.

Description

technical field [0001] The invention is a modified nano-titanium dioxide (TiO 2 ) preparation method for improving TiO 2 The invention relates to the absorption utilization rate and photocatalytic activity of visible light in the tunnel, and reduces the concentration of automobile exhaust in the tunnel, belonging to the technical field of tunnel pollution control. Background technique [0002] With the increasing number of large-scale highway tunnels, urban underground passages and the number of cars in our country, the traffic volume in the tunnels is gradually increasing. Due to the unique semi-enclosed tubular structure of the tunnel, the exhaust air is not smooth, resulting in the concentration of automobile exhaust in the tunnel being significantly higher than that outside the tunnel, resulting in serious air pollution and polluting the facilities in the tunnel, endangering the health of drivers and passengers. Especially when there is a serious traffic jam in the tun...

AI Technical Summary

Problems solved by technology

The present invention is a special lighting environment based on road tunnels, for nano-TiO 2 It can be modified so that it can be used on the pavement or lining surface in the tunnel, absorb and degrade the automobile exhaust in the tunnel, and solve the problem of nano TiO 2 Due to its wide band gap, the problem of low photocatalytic efficiency under specific illumination wavelength and intensity in the tunnel