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A method for intermediate loading of gold to improve photocatalytic activity of branched titanium dioxide

A technology of photocatalytic activity and titanium dioxide, which is applied in the field of improving the photocatalytic activity of titanium dioxide thin film, and intermediate loading of gold to improve the photocatalytic activity of branched structure titanium dioxide nanowire thin film, which can solve the problems of low light utilization efficiency and low quantum efficiency, and achieve high light Catalytic activity, improvement of photocatalytic activity, and effect of increasing contact area

Active Publication Date: 2017-09-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Pure titanium dioxide film is used in the field of photocatalysis, and its activity is restricted by two factors: first, the electrons and holes generated after light excitation are easy to recombine, and the quantum efficiency is low; second, the forbidden band width of titanium dioxide is 3.2 eV, and the corresponding excitation With a wavelength of 387 nm, it can only absorb 5% of the total solar energy reaching the ground, and the utilization efficiency of visible light is extremely low

Method used

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  • A method for intermediate loading of gold to improve photocatalytic activity of branched titanium dioxide
  • A method for intermediate loading of gold to improve photocatalytic activity of branched titanium dioxide
  • A method for intermediate loading of gold to improve photocatalytic activity of branched titanium dioxide

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Experimental program
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Effect test

Embodiment 1

[0025] Step 1 Prepare nanowire reaction solution

[0026] Add nitric acid and melamine in the hydrogen peroxide solution whose mass percentage concentration is 30%, mix to get reaction solution I, wherein the concentration of nitric acid is 0.45 mol / liter, and the concentration of melamine is 0.016 mol / liter;

[0027] Step 2 Preparation of nanowire array

[0028] Submerge the clean metal titanium sheet in the reaction solution I and react at 80°C for 48 hours.

[0029] Step 3 Nanowire intermediate heat treatment

[0030] The metal titanium sheet obtained in step 2 was cleaned with deionized water in ultrasonic waves, dried, and then heat-treated at 260° C. for 1 hour with a heating rate of 5° C. / min, and cooled with the furnace.

[0031] Step 4 Prepare gold-loaded reaction solution

[0032] Add chloroauric acid and methanol in deionized water, and mix to obtain reaction solution II, wherein the concentration of chloroauric acid is 4.2×10 -5 mol / L, the concentration of meth...

Embodiment 2

[0048] Step 1 Prepare nanowire reaction solution

[0049] Add nitric acid and melamine in the hydrogen peroxide solution whose mass percentage concentration is 30%, mix to get reaction solution I, wherein the concentration of nitric acid is 0.45 mol / liter, and the concentration of melamine is 0.016 mol / liter;

[0050] Step 2 Preparation of nanowire array

[0051] Submerge the clean metal titanium sheet in the reaction solution I and react at 80°C for 48 hours.

[0052] Step 3 Nanowire intermediate heat treatment

[0053] The metal titanium sheet obtained in step 2 was cleaned with deionized water in ultrasonic waves, dried, and then heat-treated at 260° C. for 1 hour with a heating rate of 5° C. / min, and cooled with the furnace.

[0054] Step 4 Prepare gold-loaded reaction solution

[0055] Add chloroauric acid and methanol in deionized water, and mix to obtain reaction solution II; wherein the concentration of chloroauric acid is 3.4×10 -4 mol / L, methanol concentration 1....

Embodiment 3

[0061] Step 1 Prepare nanowire reaction solution

[0062] Add nitric acid and melamine in the hydrogen peroxide solution whose mass percentage concentration is 30%, mix to get reaction solution I, wherein the concentration of nitric acid is 0.45 mol / liter, and the concentration of melamine is 0.016 mol / liter;

[0063] Step 2 Preparation of nanowire array

[0064] Submerge the clean metal titanium sheet in the reaction solution I and react at 90°C for 12 hours.

[0065] Step 3 Nanowire intermediate heat treatment

[0066] The metal titanium sheet obtained in step 2 was cleaned with deionized water in ultrasonic waves, dried, and then heat-treated at 260° C. for 1 hour with a heating rate of 5° C. / min, and cooled with the furnace.

[0067] Step 4 Prepare gold-loaded reaction solution

[0068] Add chloroauric acid and methanol in deionized water, and mix to obtain reaction solution II, wherein the concentration of chloroauric acid is 5.2×10 -6 mol / L, the concentration of meth...

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Abstract

The invention discloses a method for effectively improving the photocatalytic activity of a branched structure titanium dioxide nanowire film through intermediate gold loading, which comprises the following steps: adding nitric acid and melamine into a hydrogen peroxide solution to obtain a reaction solution I; immersing a metal titanium plate in the reaction In solution Ⅰ, react for 12-72 hours; take out the metal titanium sheet, wash with deionized water, dry, and heat-treat for 0.5-5 hours; add chloroauric acid and methanol to deionized water to obtain reaction solution Ⅱ; heat-treated metal The titanium sheet is immersed in the reaction solution II, irradiated by ultraviolet light, then immersed in a sulfuric acid solution, reacted for 12 to 72 hours, washed with deionized water, and dried to obtain a titanium dioxide nanowire film with a branched structure. The invention adopts the method of carrying gold in the middle, effectively increases the contact area between the nano-gold particles and the titanium dioxide, and remarkably improves the photocatalytic activity of the film.

Description

technical field [0001] The invention relates to a method for improving the photocatalytic activity of a titanium dioxide thin film, in particular to a method for intermediate gold loading to improve the photocatalytic activity of a branched structure titanium dioxide nanowire thin film, which belongs to the field of new materials. Background technique [0002] Titanium dioxide film has the advantages of low cost, non-toxicity, stable chemical properties, high catalytic activity and recyclability, and has been widely used in the fields of photocatalysis, photoelectrocatalysis, solar cells and gas sensors. Common titanium dioxide film structures include nanowires, nanoflowers, nanorods, etc. Compared with the above-mentioned nanostructures, the titanium dioxide branched structure has a larger specific surface area, which is more conducive to full contact with the reactants. At the same time, it has multiple light scattering effects, which can promote light absorption and impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J21/06B01J35/02B82Y30/00B82Y40/00A62D3/17A62D101/26A62D101/28B01J35/00
Inventor 吴进明钱欣悦
Owner ZHEJIANG UNIV