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Efficient visible-light responsive noble metal-Bi-TiO2 nanometer heterojunction photocatalyst and preparation method thereof

A technology of bi-tio2 and photocatalyst, which is applied in the field of noble metal-Bi-TiO2 nano-heterojunction photocatalyst and its preparation, can solve the limitations of TiO2 photocatalytic technology application, high recombination rate of photogenerated carriers, and solar energy utilization rate Low-level problems, to achieve high visible light catalytic activity, improve photocatalytic efficiency, and strong practicability

Inactive Publication Date: 2014-07-23
伊文涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because it can only use ultraviolet light with a wavelength less than 387nm, and ultraviolet light only accounts for about 4% of solar energy, the utilization rate of solar energy is low; in addition, TiO 2 The recombination rate of photogenerated carriers (electrons and holes) is high, and the photocatalytic efficiency is low
These disadvantages severely limit the TiO 2 Application of photocatalytic technology in practice

Method used

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  • Efficient visible-light responsive noble metal-Bi-TiO2 nanometer heterojunction photocatalyst and preparation method thereof
  • Efficient visible-light responsive noble metal-Bi-TiO2 nanometer heterojunction photocatalyst and preparation method thereof
  • Efficient visible-light responsive noble metal-Bi-TiO2 nanometer heterojunction photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve butyl titanate in absolute ethanol at a volume ratio of 1:3, and stir to obtain solution A; bismuth nitrate is mixed according to the ratio of bismuth to titanium Bi / (n Ti+ no Bi ) = 10% dissolved in a concentration of 4mol L -1 In the dilute nitric acid solution, a clear solution B was obtained; at a stirring speed of 450rpm, the solution B was added dropwise to the solution A to obtain a Bi / Ti mixed sol; the above sol was transferred to a hydrothermal reaction kettle, and hydrothermal React for 10 hours, cool to room temperature, dry the product in vacuum at 80°C for 8 hours after solid-liquid separation, grind it and roast it at 500°C for 4 hours to obtain bismuth-doped titanium dioxide Bi-TiO 2 , recorded as 10% Bi-TiO 2 ; The prepared Bi-TiO 2 Dispersed at a concentration of 0.02mol L -1 HAuCl 4 A mixed solution is obtained in the solution, so that the mass of the precious metal in the mixed solution is equal to that of Bi-TiO 2 The mass ratio of t...

Embodiment 2

[0040] Dissolve butyl titanate in absolute ethanol at a volume ratio of 1:3, and stir to obtain solution A; bismuth nitrate is mixed according to the ratio of bismuth to titanium Bi / (n Ti+ no Bi ) = 10% dissolved in a concentration of 4mol L -1 In the dilute nitric acid solution, a clear solution B was obtained; at a stirring speed of 450rpm, the solution B was added dropwise to the solution A to obtain a Bi / Ti mixed sol; the above sol was transferred to a hydrothermal reaction kettle, and hydrothermal React for 10 hours, cool to room temperature, dry the product in vacuum at 80°C for 8 hours after solid-liquid separation, grind it and roast it at 500°C for 4 hours to obtain bismuth-doped titanium dioxide Bi-TiO 2 , recorded as 10% Bi-TiO 2 ; The prepared Bi-TiO 2 Dispersed at a concentration of 0.02mol L -1 H 2 PtCl 6 A mixed solution is obtained in the solution, so that the mass of the precious metal in the mixed solution is equal to that of Bi-TiO 2 The mass ratio ...

Embodiment 3

[0043] Dissolve butyl titanate in absolute ethanol at a volume ratio of 1:8, and stir to obtain solution A; Bi / (n Ti+ no Bi )=15% dissolved in a concentration of 6mol L -1 In the dilute nitric acid solution, a clear solution B was obtained; at a stirring speed of 400rpm, the solution B was added dropwise to the solution A to obtain a Bi / Ti mixed sol; the above sol was transferred to a hydrothermal reactor, and hydrothermal React for 4 hours, cool to room temperature, dry the product in vacuum at 60°C for 10 hours after solid-liquid separation, grind it and roast it at 450°C for 6 hours to obtain bismuth-doped titanium dioxide Bi-TiO 2 , denoted as 15% Bi-TiO 2 ; The prepared Bi-TiO 2 Dispersed at a concentration of 0.01mol L -1 HAuCl 4 A mixed solution is obtained in the solution, so that the mass of the precious metal in the mixed solution is equal to that of Bi-TiO 2 The mass ratio of the above mixed solution is 0.1%. Stir the above mixed solution in the dark for 30 ...

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Abstract

The invention belongs to the technical field of TiO2 base photocatalysts, and in particular relates to an efficient visible-light responsive noble metal-Bi-TiO2 nanometer heterojunction photocatalyst and a preparation method thereof. The preparation method is characterized in that Bi ion-doped TiO2 which has the controllable shape and grain size, and visible-light responsive capacity is synthesized by adopting a hydrothermal-solvothermal reaction, the spectral responsive range of the photocatalyst is expanded, compared with the common TiO2, the noble metal-Bi-TiO2 nanometer heterojunction photocatalyst obtained through light chemical sedimentation on the surface of the noble metal can further separate photoproduction electron and hole, the photocatalytic efficiency of products is further improved, and an organic pollutant is effectively degraded in a short time, the products obtained by adopting the technology have the high visible-light catalytic activity, the photocatalytic efficiency for degrading the organic pollutant, of parts of the products under visible light is higher than that of the international standard P25 under ultraviolet light. The preparation method is simple and easy, has no pollution, strong practicability, and wide product application range.

Description

technical field [0001] The present invention belongs to TiO 2 Based photocatalyst technology field, specifically related to a noble metal-Bi-TiO with high efficiency visible light response 2 Nano heterojunction photocatalyst and preparation method thereof. Background technique [0002] With the development of economy and society, the current environmental pollution has become a major challenge for human beings. Various water pollution and air pollution have been intensified, resulting in the continuous deterioration of the ecological environment and seriously affecting people's health and quality of life. Therefore, how to purify people and air cost-effectively is a major scientific challenge that we must address and solve. Compared with traditional methods such as physical adsorption, chemical oxidation, and membrane treatment, semiconductor photocatalysis technology drives a series of important chemical reactions through sunlight, which can not only convert low-density s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/644
Inventor 伊文涛闫春燕
Owner 伊文涛
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