Process for preparing rubidium-doped titanium dioxide photocatalytic material by virtue of spray drying method

Abstract

The invention discloses a process for preparing rubidium-doped titanium dioxide photocatalytic material by virtue of a spray drying method. The process comprises the following steps: (1) preparing a rubidium nitrate solution, adding absolute ethyl alcohol and acetic acid, adding nitric acid to adjust the pH value to 1.0-3.0, and adequately stirring at the room temperature, so as to obtain a solution A; (2) adequately stirring ethanol with butyl titanate at the room temperature, so as to prepare a solution B; (3) slowly dropwise adding the solution B into the solution A, and stirring at 20-35 DEG C, so as to obtain sol with viscosity controlled at 20mPa.s-100mPa.s; (4) carrying out spray drying on the sol by virtue of a centrifugal atomizer; and (5) roasting the dried material, so as to obtain the photocatalytic material. By virtue of the process, the rubidium-doped titanium dioxide photocatalytic material with high photocatalytic activity can be obtained.

Description

technical field [0001] The invention relates to a process for preparing a rubidium-doped titanium dioxide photocatalytic material by a spray drying method, and belongs to the technical field of photocatalytic material preparation. Background technique [0002] Since the discovery of the Honda-Fujishima effect in 1972, the field of semiconductor photocatalysis has received widespread attention and research from scholars all over the world. Photocatalysis has broad prospects for applications in energy and the environment. At present, many countries in the world (such as Japan, the United States, etc.) have invested a lot of money and talents to study the technology of photocatalytic degradation of pollutants. Among many studied photocatalysts, nano-TiO 2 Because of its high photocatalytic efficiency, low preparation cost, stable physical and chemical properties, non-toxic and non-corrosive, it has become the most widely studied photocatalyst. There are many techniques for p...

AI Technical Summary

Problems solved by technology

But in its practical application, there are still two main problems: (1) the light absorption wavelength range of the pure titanium dioxide obtained is narrow, only absorbs to some extent in the ultraviolet region, and the utilization rate of sunlight is low (ultraviolet light accounts for the sun's light about 5%) and the photogenerated carriers produced are very easy to recombine, the quantum efficiency is low, and its photocatalytic effect cannot be fully exerted; (2) the titanium dioxide photocatalyst prepared by the sol-gel method needs a long aging time, Moreover, the dry gel particles after natural aging and manual grinding are coarse and have a wide particle size distribution, which is not conducive to roasting to obtain materials with high photocatalytic activity.

However, the high cost of doping these metal ions is not conducive to practical applications.

We found that the current support for alkali metals (such as Rb, Cs, etc.) in TiO 2 Very little research has been done on the effect of doping

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