Preparation and application of a core-shell structured ti-zr-si composite photocatalyst with strong absorption of incident light

Abstract

Preparation and application of a core-shell structure Ti-Zr-Si composite photocatalyst with strong absorption of incident light, using zirconium oxychloride octahydrate, ethyl orthosilicate, and titanium sulfate as starting materials to prepare titanium silicon Zirconium sol, wherein the amount of raw materials added is n(Ti):n(Zr):n(Si)=2~6:1:1~4. Using citric acid as the metal ion complexing agent, the mass ratio of citric acid to zirconium oxychloride octahydrate is 0.5:2. Titanium silicon zirconium sol was dried and calcined at 800°C to obtain white TiO with good crystallinity 2 -ZrO 2 ‑SiO2 2 Composite powder. After preparing another part of the same titanium-silicon-zirconium sol, impregnated and calcined, white TiO with good crystallinity was obtained. 2 -ZrO 2 ‑SiO2 2 The composite powder is calcined again at 350-450°C for 1-2 hours to obtain a Ti-Zr-Si composite photocatalyst with a core-shell structure. The prepared composite photocatalyst has good adsorption and photocatalytic properties at the same time, which can greatly improve the photocatalytic efficiency. The invention has the characteristics of simple process, short cycle, low energy consumption and low cost.

Description

technical field

[0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a core-shell structure powder, in particular to the preparation and application of a core-shell structure Ti-Zr-Si composite photocatalyst with strong absorption effect on incident light. Background technique

[0002] In recent years, the problem of environmental pollution has always attracted everyone's attention. With the development of textile and printing and dyeing industries, the pollution of dye water has become more and more serious, and it has become a major source of pollution. In 1976, Carey and others used semiconductor materials for photocatalytic degradation of pollutants, which opened the prelude of semiconductor photocatalytic technology in the field of environmental protection. As a typical structural and functional material, TiO 2 Semiconductor photocatalysts have been the most studied materials. However, due to the pure phase TiO 2 Th...

Examples

Embodiment 1

[0027] A core-shell structure Ti-Zr-Si composite photocatalyst preparation process with strong absorption of incident light, the specific process is as follows:

[0028] (1) Step 1: under the condition of continuous magnetic stirring, add alkaline reagent ammonia water to 20 mL of deionized water, adjust pH=7~10, dissolve zirconium oxychloride and metal ion complexing agent in the above deionized water, prepare A uniform and transparent solution with a zirconium ion concentration of 0.05moL / L was obtained, that is, a zirconium precursor solution. Wherein, the mass ratio of zirconium oxychloride and metal ion complexing agent is 0.5:2. The ethyl orthosilicate solution was prepared by dissolving ethyl orthosilicate in absolute ethanol. Dissolve titanium sulfate in deionized water to prepare a titanium solution. The addition amounts of ethyl orthosilicate and titanium sulfate were determined according to n(Ti):n(Zr):n(Si)=6:1:4. Under the condition of continuous magnetic stirr...

Embodiment 2

[0031]The preparation process of a core-shell structure Ti-Zr-Si composite photocatalyst with strong absorption of incident light is the same as in Example 1, except that the calcination time after impregnation is different.

[0032] In this example, the calcination temperature after impregnation was 400°C.

[0033] figure 1 is the white (TiO) prepared in Example 2 2 -ZrO 2 -SiO 2 ) (a) and UV-vis absorption spectra of the core-shell structured Ti-Zr-Si composite photocatalyst (b). It can be seen from the figure that the white (TiO 2 -ZrO 2 -SiO 2 ) The composite photocatalyst hardly absorbs incident light with a wavelength greater than 400 nm. The core-shell structure Ti-Zr-Si composite photocatalyst has a high absorption intensity in the entire visible light range, indicating that its response to visible light has a strong absorption effect.

[0034] figure 2 is white (TiO 2 -ZrO 2 -SiO 2 ) (S1) and the photocatalytic degradation of Rhodamine B by the core-shell...

technical field

[0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a core-shell structure powder, in particular to the preparation and application of a core-shell structure Ti-Zr-Si composite photocatalyst with strong absorption effect on incident light. Background technique

[0002] In recent years, the problem of environmental pollution has always attracted everyone's attention. With the development of textile and printing and dyeing industries, the pollution of dye water has become more and more serious, and it has become a major source of pollution. In 1976, Carey and others used semiconductor materials for photocatalytic degradation of pollutants, which opened the prelude of semiconductor photocatalytic technology in the field of environmental protection. As a typical structural and functional material, TiO 2 Semiconductor photocatalysts have been the most studied materials. However, due to the pure phase TiO 2 Th...

Examples

Embodiment 1

[0027] A core-shell structure Ti-Zr-Si composite photocatalyst preparation process with strong absorption of incident light, the specific process is as follows:

[0028] (1) Step 1: under the condition of continuous magnetic stirring, add alkaline reagent ammonia water to 20 mL of deionized water, adjust pH=7~10, dissolve zirconium oxychloride and metal ion complexing agent in the above deionized water, prepare A uniform and transparent solution with a zirconium ion concentration of 0.05moL / L was obtained, that is, a zirconium precursor solution. Wherein, the mass ratio of zirconium oxychloride and metal ion complexing agent is 0.5:2. The ethyl orthosilicate solution was prepared by dissolving ethyl orthosilicate in absolute ethanol. Dissolve titanium sulfate in deionized water to prepare a titanium solution. The addition amounts of ethyl orthosilicate and titanium sulfate were determined according to n(Ti):n(Zr):n(Si)=6:1:4. Under the condition of continuous magnetic stirr...

Embodiment 2

[0031]The preparation process of a core-shell structure Ti-Zr-Si composite photocatalyst with strong absorption of incident light is the same as in Example 1, except that the calcination time after impregnation is different.

[0032] In this example, the calcination temperature after impregnation was 400°C.

[0033] figure 1 is the white (TiO) prepared in Example 2 2 -ZrO 2 -SiO 2 ) (a) and UV-vis absorption spectra of the core-shell structured Ti-Zr-Si composite photocatalyst (b). It can be seen from the figure that the white (TiO 2 -ZrO 2 -SiO 2 ) The composite photocatalyst hardly absorbs incident light with a wavelength greater than 400 nm. The core-shell structure Ti-Zr-Si composite photocatalyst has a high absorption intensity in the entire visible light range, indicating that its response to visible light has a strong absorption effect.

[0034] figure 2 is white (TiO 2 -ZrO 2 -SiO 2 ) (S1) and the photocatalytic degradation of Rhodamine B by the core-shell...

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