Unlock instant, AI-driven research and patent intelligence for your innovation.

Technique for improving visible light catalytic activity of titanium dioxide photocatalyst

A technology of titanium dioxide and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as inefficiency, poor use of light, and inefficiency practical obstacles, etc., to achieve The effect of broad application prospects

Inactive Publication Date: 2009-10-21
李志宏
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the above-mentioned photocatalyst composed of titanium dioxide can hardly use visible light well, and it is very inefficient from the viewpoint of energy conversion efficiency.
Moreover, this inefficiency becomes a great obstacle to practical use

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Select anatase TiO with a particle size of 30-50nm 2 Powder, by Ti:SO 4 2- Add a certain amount of 0.1mol / L sulfuric acid solution at a molar ratio of 10:1, place it in a round bottom beaker, and stir to form a suspension. Gradually heat it to make it boil and condense, and ash occurs at a certain temperature to obtain loose TiO 2 Block: after crushing and grinding the block, it is placed in a neutral atmosphere furnace and fired at 500° C. for 1 hour to obtain an improved product.

[0012] As detected by the methyl orange decolorization test, the powder has visible light catalytic activity, can be excited by visible light with a wavelength of 380-510 nanometers, and the effective excitation wavelength can extend to the green light region.

Embodiment 2

[0014] By Ti:SO 4 2- Add metatitanic acid into a certain amount of 0.3mol / L sulfuric acid solution with a molar ratio of 10:1, put it in a round bottom beaker, stir and gradually heat it to boil and concentrate until it is ashed, crush and grind the ashed product and place it in Fired at 550°C for 8 hours in a neutral atmosphere furnace to obtain an improved product.

[0015] As detected by the methyl orange decolorization test, the powder has visible light catalytic activity, can be excited by visible light with a wavelength of 380-510 nanometers, and the effective excitation wavelength can extend to the green light region.

[0016] At the same time, the test results show that there is no free SO in the above products 4 2- .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a technique for improving the visible light catalytic activity of a titanium dioxide photocatalyst, which is characterized by adopting sulphuric acid to enhance the visible light absorption rate of titanium dioxide. The technique comprises the following steps: (a) adding titanium dioxide powder into a sulphuric acid solution with the concentration of 0.1-0.3 mol / liter according to a mol ratio of Ti: SO4 equal to 10: 1; (b) sufficiently stirring and heating the mixed solution to be boiled, concentrating and drying to be incinerated so as to obtain loose blocks; and (c) grinding the loose blocks into powder to be baked for 1-8 hours under the temperature of 500 DEG C-550 DEG C to obtain the titanium dioxide photocatalyst with improved visible light catalytic activity. After the titanium dioxide is processed by the sulphuric acid, the light absorptive character of the titanium dioxide is enhanced so as to increase the absorption of the visible light, and the visible light catalytic activity is correspondingly enhanced; the technique can be used for processing organic contaminants or metallic ions in polluted water and also be used for purifying air and especially has extensive application prospect in the filed of medicine and sanitation which need serious control of ultraviolet irradiation.

Description

Technical field: [0001] The invention relates to a process for improving the visible light catalytic activity of titanium dioxide photocatalyst, which belongs to the preparation method of titanium dioxide photocatalyst. Background technique: [0002] It is known that photocatalysts composed of anatase-type titanium dioxide can be used for various purposes such as antibacterial tiles, self-cleaning building materials, super-hydrophilic materials, deodorizing / deodorizing materials, water purification, and cancer treatment. Development is actively underway. [0003] However, for anatase carbon dioxide, ultraviolet light below 400 nm is required for excitation. On the other hand, sunlight and artificial light that can be used as excitation light sources contain much more visible light than ultraviolet rays. Unfortunately, the above-mentioned photocatalyst composed of titanium dioxide can hardly be said to make good use of visible light, and is very inefficient from the viewpoi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06
Inventor 李志宏
Owner 李志宏