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Hydroxyl oxidize iron modified titanium dioxide composite photocatalyst as well as preparation method and application thereof

A technology of iron oxyhydroxide and titanium dioxide, which is applied in the field of photocatalytic materials, can solve the problems of reducing the recombination rate of electron-hole pairs, few reports of photocatalytic desulfurization, and low photocatalytic efficiency, so as to alleviate the phenomenon of photocorrosion and facilitate the promotion Application, abundant effects

Active Publication Date: 2018-12-11
FUZHOU UNIV
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  • 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

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  • Hydroxyl oxidize iron modified titanium dioxide composite photocatalyst as well as preparation method and application thereof
  • Hydroxyl oxidize iron modified titanium dioxide composite photocatalyst as well as preparation method and application thereof
  • Hydroxyl oxidize iron modified titanium dioxide composite photocatalyst as well as preparation method and application thereof

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Experimental program
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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 , ...

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Abstract

The invention discloses a hydroxyl oxidize iron modified titanium dioxide composite photocatalyst as well as a preparation method and application thereof. According to the preparation method, FeOOH isprepared by adopting a hydrothermal method, TiO2 sol is prepared by adopting a sol-gel method, an then the FeOOH and TiO2 are uniformly mixed and then are sprayed onto a glass fiber sheet so as to prepare the photocatalyst. The composite photocatalyst has the advantages that the TiO2 is modified by the FeOOH, so that the light absorption wavelength range of the catalyst is expanded, in addition,the photo-induced electron-hole recombination rate in the catalyst is decreased, and therefore the degradation effect of the photocatalyst on organic pollutants, especially malodorous sulfur-containedcompounds is effectively improved. Meanwhile, the preparation method for the catalyst has the advantages of being simple, feasible, mild in reaction condition and wide in application prospect in theaspects of photocatalytic degradation of the organic pollutants and indoor and outdoor harmful gas, especially H2S, SO2, mercaptan, sulfur ether and other malodorous sulfur-contained compounds, environmental protection and the like.

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

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Application Information

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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
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