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Niobium pentoxide/titanium dioxide composite photocatalyst as well as preparation method and application thereof

A technology of niobium pentoxide and titanium dioxide, which is applied in the field of niobium pentoxide/titanium dioxide composite photocatalyst and its preparation, can solve the problems of catalytic effect impact, human body radiation, high energy consumption, etc., and achieve cheap and easy to obtain reaction raw materials, reduce Cost of preparation, effect of avoiding loading problems

Pending Publication Date: 2021-02-19
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have high energy consumption and microwave radiation to the human body
Studies have shown that the surface defects of the material can increase the catalytic performance of the material itself, and the crystallinity of these prepared Nb-Ti binary composite oxides is relatively good, so its catalytic effect has been significantly affected

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  • Niobium pentoxide/titanium dioxide composite photocatalyst as well as preparation method and application thereof
  • Niobium pentoxide/titanium dioxide composite photocatalyst as well as preparation method and application thereof
  • Niobium pentoxide/titanium dioxide composite photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0031] The invention discloses a method for preparing a niobium pentoxide / titanium dioxide composite photocatalyst for purifying nitrogen oxides, comprising the following steps:

[0032] (1) Dissolve the inorganic titanium salt in deionized water and dehydrated ethanol, fully stir to obtain a clear and transparent solution A with a concentration of 5 to 50 g / L, dissolve the niobium salt in deionized ethanol, and fully stir to obtain a concentration of 5~50g / L clear and transparent solution B;

[0033] (2) Add lye dropwise to solution A and solution B obtained in step (1) at room temperature until the pH value of the solution is 8 to 10, and white titanium hydroxide and niobium hydroxide precipitates are obtained respectively, and the precipitates are washed with deionized water and centrifugation to remove impurity ions to obtain titanium hydroxide and niobium hydroxide;

[0034] (3) Obtained by dissolving titanium hydroxide and niobium hydroxide in step (2) respectively with...

Embodiment 1

[0044] Step 1. Slowly add 1g of titanyl sulfate to 40mL of deionized water, stir at 800r / min for 1h until the solution is clear and transparent, adjust the pH of the solution to 9 with ammonia water, and obtain white titanium hydroxide precipitate; add 1.35g of pentachloride Niobium was slowly added to 54 mL of absolute ethanol, stirred at 800 r / min for 2 h until the solution was clear and transparent, and the pH of the solution was adjusted to 9 with ammonia water to obtain a white niobium hydroxide precipitate. The two kinds of white precipitates were filtered and centrifuged to obtain titanium hydroxide solid and niobium hydroxide solid respectively; 5mL mass fraction of 30% hydrogen peroxide aqueous solution was slowly added to the titanium hydroxide solid (the substance of hydrogen peroxide and titanium hydroxide The amount ratio is 10:1), after stirring for 1h, the solid disappears, and an orange-yellow transparent titanium precursor solution is obtained; 5mL mass fractio...

Embodiment 2

[0048] Step 1. Slowly add 10g of titanium sulfate to 200mL of deionized water, stir at 600r / min for 3h until the solution is clear and transparent, adjust the pH of the solution to 8 with ammonia water, and obtain white titanium hydroxide precipitate; add 1.124g of niobium pentachloride Add slowly to 225mL absolute ethanol, stir at 600r / min for 4h until the solution is clear and transparent, adjust the pH of the solution to 10 with ammonia water, and obtain white niobium hydroxide precipitate. The two kinds of white precipitates were filtered and centrifuged to obtain titanium hydroxide solid and niobium hydroxide solid respectively; 2.1mL mass fraction of 30% hydrogen peroxide aqueous solution was slowly added to the titanium hydroxide solid (the amount of hydrogen peroxide and titanium hydroxide The molar ratio is 5:1), after stirring for 1 h, the solid disappears, and an orange-yellow transparent titanium precursor solution is obtained; 0.2 mL of a mass fraction of 30% hydro...

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Abstract

The invention discloses a niobium pentoxide / titanium dioxide composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials for atmospheric protection. The preparation method comprises the following steps: 1) dissolving titanium hydroxide in hydrogen peroxide to obtain a titanium precursor solution, and dissolving niobium hydroxide in hydrogen peroxide to obtain a niobium precursor solution; and 2) mixing the obtained titanium precursor solution and the obtained niobium precursor solution for reaction to obtain asol product, washing the obtained sol product, and conducting drying to obtain the niobium pentoxide / titanium dioxide composite photocatalyst. The niobium pentoxide / titanium dioxide composite photocatalyst disclosed by the invention has excellent photocatalytic activity due to a large number of defects on the surface of the material. Therefore, the niobium pentoxide / titanium dioxide composite photocatalyst has the characteristics of safety, environmental protection, high purity, no toxicity, no harm and industrialization, and the prepared niobium pentoxide / titanium dioxide composite photocatalyst can be used as a photocatalyst to be applied to the field of nitric oxide purification.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials for atmospheric protection, and relates to a niobium pentoxide / titanium dioxide composite photocatalyst and a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x ) content seriously exceeds the standard, which will easily lead to the generation of photochemical smog and acid rain, which will seriously endanger human life, health and safety. At present, the methods for controlling nitrogen oxides mainly include chemical catalytic reduction method and physical adsorption method, etc. These methods have certain defects, such as high temperature or high pressure reaction, there is a certain risk, and impurities are easily introduced during the reaction process or cause secondary pollution, and they are not suitable. Control indoor pollution. The photocatalytic oxidation method has the advantages of mild reaction conditions, strong oxidatio...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01D53/86B01D53/56
CPCB01J23/002B01J23/20B01D53/8628B01J35/39
Inventor 杜高辉毕祥孙东峰苏庆梅余愿许并社
Owner SHAANXI UNIV OF SCI & TECH
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