Preparation and application of core-shell structure Ti-Zr-Si composite photocatalyst with strong absorption effect on incident light

Abstract

The invention discloses preparation and application of a core-shell structure Ti-Zr-Si composite photocatalyst with a strong absorption effect on incident light. Zirconium oxychloride octahydrate, tetraethoxysilane and titanium sulfate are used as initial raw materials to prepare titanium-silicon-zirconium sol, and the adding amount of the raw materials is that n (Ti): n (Zr): n (Si) = (2-6): 1: (1-4). Citric acid is used as a metal ion complexing agent, and the mass ratio of citric acid to zirconium oxychloride octahydrate is 0.5: 2. The titanium-silicon-zirconium sol is dried, and the titanium-silicon-zirconium sol is calcined at 800 DEG C to obtain white TiO2-ZrO2-SiO2 composite powder with good crystallinity. Another part of the same titanium-silicon-zirconium sol is prepared, and dipped and calcined to obtain white TiO2-ZrO2-SiO2 composite powder with good crystallinity and calced at 350-450 DEG C for 1-2 hours again to obtain the core-shell structure Ti-Zr-Si composite photocatalyst. The prepared composite photocatalyst has very good adsorption and photocatalysis properties, and the photocatalysis efficiency can be greatly improved. The core-shell structure Ti-Zr-Si compositephotocatalyst has the characteristics of simple process, short period, low energy consumption and low cost.

Description

technical field

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

[0002] In recent years, the problem of environmental pollution has attracted everyone's attention. With the development of the 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 et al. used semiconductor materials for photocatalytic degradation of pollutants, which opened the prelude to 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. But due to the pure phase TiO 2 The powder ...

Examples

Embodiment 1

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

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

Embodiment 2

[0031]A preparation process for 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 embodiment: the calcination temperature after impregnation is 400°C.

[0033] figure 1 It is the white (TiO2) prepared in Example 2 2 -ZrO 2 -SiO 2 ) UV-Vis absorption spectra of (a) and core-shell structure 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 the incident light with a wavelength greater than 400nm. The core-shell structure Ti-Zr-Si composite photocatalyst has a high absorption intensity in the entire visible light range, indicating that it has a strong absorption in response to visible light.

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

technical field

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

[0002] In recent years, the problem of environmental pollution has attracted everyone's attention. With the development of the 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 et al. used semiconductor materials for photocatalytic degradation of pollutants, which opened the prelude to 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. But due to the pure phase TiO 2 The powder ...

Examples

Embodiment 1

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

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

Embodiment 2

[0031]A preparation process for 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 embodiment: the calcination temperature after impregnation is 400°C.

[0033] figure 1 It is the white (TiO2) prepared in Example 2 2 -ZrO 2 -SiO 2 ) UV-Vis absorption spectra of (a) and core-shell structure 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 the incident light with a wavelength greater than 400nm. The core-shell structure Ti-Zr-Si composite photocatalyst has a high absorption intensity in the entire visible light range, indicating that it has a strong absorption in response to visible light.

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

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