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

Titanium dioxide composite photocatalyst modified by iron oxyhydroxide and its preparation method and application

An iron oxyhydroxide and titanium dioxide technology, applied in the field of photocatalytic materials, can solve the problems of few reports on photocatalytic desulfurization, low photocatalytic efficiency, and reduced electron-hole pair recombination rate, so as to alleviate the phenomenon of photocorrosion and be beneficial to popularization. Application, abundant effects

Active Publication Date: 2020-12-25
FUZHOU UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its wide band gap (3.2eV for anatase, 3.0eV for rutile) leads to TiO 2 It can only be excited by ultraviolet light, so it is rarely reported in the research of photocatalytic desulfurization
[0005] In view of the above problems, in order to improve the light absorption wavelength range of the catalyst excited, and then improve the degradation efficiency of organic pollutants, harmful gases in the atmosphere, especially malodorous sulfur-containing compounds, the present invention uses FeOOH to TiO 2 modified to prepare a FeOOH / TiO 2 Composite photocatalyst, since the bandgap of FeOOH is generally around 2.2eV, it can use photo-excited electronic transition at 563.6nm, and FeOOH and TiO 2 It can form a heterojunction, so it can promote electron transfer and reduce the recombination rate of electron-hole pairs, thus greatly improving the problem of low photocatalytic efficiency caused by the poor light absorption performance of traditional photocatalysts

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Titanium dioxide composite photocatalyst modified by iron oxyhydroxide and its preparation method and application
  • Titanium dioxide composite photocatalyst modified by iron oxyhydroxide and its preparation method and application
  • Titanium dioxide composite photocatalyst modified by iron oxyhydroxide and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of embodiment 1 FeOOH

[0024] Take 5g FeSO 4 ·7H 2 O was dissolved in deionized water at 70°C, and heated in a constant temperature heating magnetic stirrer to keep the water temperature stable at 70°C, and then slowly added 5g Na 2 CO 3 Powder, adjust the pH to 8 at room temperature after reacting for 1 hour, filter after aging for 3 hours, and wash with hot water at 60°C for several times until it is washed with BaCl 2 Titrate the filtrate with the solution until no obvious precipitation is formed, then dry the filter residue on a watch glass and dry it in an oven to obtain FeOOH.

[0025] figure 1 The nitrogen adsorption-desorption curve (a) and pore size distribution (b) of the obtained FeOOH sample. After calculation, its specific surface area is 199.49m 2 / g, indicating that the prepared FeOOH sample has a larger specific surface area.

Embodiment 2

[0026] Example 2 TiO 2 preparation of

[0027] Add titanium tetrachloride to deionized water, slowly add 8wt% dilute ammonia water dropwise under vigorous stirring to adjust the pH of the solution to 12, leave the obtained white precipitate to age for 4 hours, then repeatedly filter and wash with deionized water to the pH of the eluate is 10, the filter cake is dissolved in distilled water and adjusted to pH 8 with 3.8mol / L dilute nitric acid, and TiO is obtained by ultrasonic treatment 2 Sol, which were calcined at 100°C, 200°C, and 300°C for 10-30h respectively.

Embodiment 3

[0028] Example 3 FeOOH / TiO 2 preparation of

[0029] The FeOOH that embodiment 1 makes and the TiO that does not calcined after ultrasonic in embodiment 2 2 Sol according to FeOOH and TiO 2 The molar ratio is 1:100, and mechanically stirred with a magnetic stirrer to ensure that the sample is evenly mixed, and then the mixed solution is divided into four times, and sprayed evenly on the front and back sides of the 60×80cm glass fiber sheet with a spray gun. After each side is sprayed , dry at room temperature, and then spray the next side, repeat the operation. Wait for both sides to dry naturally, put them in an oven to dry, and then calcinate at 100°C, 200°C, and 300°C for 10-30 hours to obtain a composite photocatalyst.

[0030] figure 2 TiO obtained by calcination at different temperatures 2 (a) with FeOOH / TiO 2 (b) FTIR spectrum. Depend on figure 2 It can be seen that the unmodified TiO 2 At 3430, 1624, 1376cm -1 TiO 2 The characteristic absorption peak of , ...

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

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses an iron oxyhydroxide-modified titanium dioxide composite photocatalyst and its preparation method and application. It adopts a hydrothermal method to prepare FeOOH and a sol-gel method to prepare TiO. 2 sol, then FeOOH and TiO 2 Mix evenly and spray onto fiberglass sheets. This composite photocatalyst uses FeOOH to react with TiO 2 Modify to expand the light absorption wavelength range of the catalyst and reduce the photogenerated electron-hole recombination rate in the catalyst, thereby effectively improving its degradation of organic pollutants, especially malodorous sulfur-containing compounds. At the same time, the preparation method of the catalyst is simple and easy, the reaction conditions are mild, and it can effectively degrade organic pollutants and harmful gases indoors and outdoors, especially such as H 2 S.S.O. 2 , mercaptans, thioethers and other malodorous sulfur-containing compounds, as well as environmental protection, etc. It has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a TiO modified by FeOOH 2 Composite photocatalyst and its preparation method and application. Background technique [0002] The rapid development of the economy and the gradual improvement of the modernization level of industry and agriculture have greatly improved the living standards of human beings. However, the extensive development model of high consumption, high investment, and high pollution has also brought about a series of serious problems such as air pollution and the depletion of mineral energy. Among the above-mentioned problems, the pollution caused by sulfur-containing compounds such as hydrogen sulfide, mercaptan, sulfide, sulfur dioxide, and sulfur trioxide bears the brunt. Taking hydrogen sulfide as an example, as one of the eight major odor pollutants in my country, hydrogen sulfide easily escapes from sulfide-containing wastewater into the a...

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 Patents(China)
IPC IPC(8): B01J23/745B01D53/86B01D53/48
CPCB01D53/8603B01J23/745B01D2255/802B01J35/39
Inventor 员汝胜熊壮丁正新张子重魏英聪
Owner FUZHOU UNIV