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Method for enhancing Cr<6+> photocatalysis of TiO2

A technology of photocatalysis and photocatalysis, applied in the field of pollutant treatment, can solve the problem of low efficiency of catalytic reduction of Cr6+, achieve the effect of improving photocatalytic treatment capacity, reducing treatment cost and reducing use

Inactive Publication Date: 2017-02-22
过冬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because TiO 2 The photogenerated electrons are easy to recombine with the photogenerated holes, pure TiO 2 Catalytic reduction of Cr 6+ is not efficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An enhanced TiO 2 Photocatalytic Cr 6+ The method, described method adopts titanium dioxide / aminated graphene oxide composite photocatalyst, the content of described aminated graphene oxide is 0.5wt%.

[0020] The preparation method of described titanium dioxide / aminated graphene oxide composite photocatalyst comprises:

[0021] (1) Mix the flake graphite of 2 weight parts, the concentrated sulfuric acid of 300 weight parts and the phosphoric acid of 30 weight parts, slowly add the potassium permanganate of 15 weight parts, stir at 45 ℃ for 9 hours;

[0022] (2) At 0° C., add 300 parts by weight of deionized water and 20 parts by weight of hydrogen peroxide at a concentration of 10 wt % to the mixture, and stir for 5 minutes;

[0023] (3) separate and successively wash the product with deionized water, hydrochloric acid of 10wt% concentration and absolute ethanol, and vacuum-dry to obtain graphene oxide;

[0024] (4) Disperse the graphene oxide in 15 parts by weight ...

Embodiment 2

[0029] An enhanced TiO 2 Photocatalytic Cr 6+ The method, described method adopts titanium dioxide / aminated graphene oxide composite photocatalyst, the content of described aminated graphene oxide is 3wt%.

[0030] The preparation method of described titanium dioxide / aminated graphene oxide composite photocatalyst comprises:

[0031] (1) 5 parts by weight of flake graphite, the concentrated sulfuric acid of 500 parts by weight and the phosphoric acid of 60 parts by weight are mixed uniformly, slowly add the potassium permanganate of 20 parts by weight, and stir at 55 DEG C for 18 hours;

[0032] (2) At 5°C, add 500 parts by weight of deionized water and 50 parts by weight of hydrogen peroxide at a concentration of 30 wt% to the mixture, and stir for 10 minutes;

[0033] (3) separate and wash the product successively with deionized water, 30wt% concentration of hydrochloric acid and absolute ethanol, and vacuum-dry to obtain graphene oxide;

[0034] (4) Disperse the graphene...

Embodiment 3

[0039] An enhanced TiO 2 Photocatalytic Cr 6+ The method, described method adopts titanium dioxide / aminated graphene oxide composite photocatalyst, and the content of described aminated graphene oxide is 1wt%.

[0040] The preparation method of described titanium dioxide / aminated graphene oxide composite photocatalyst comprises:

[0041] (1) Mix the flake graphite of 3 weight parts, the concentrated sulfuric acid of 400 weight parts and the phosphoric acid of 50 weight parts, slowly add the potassium permanganate of 20 weight parts, stir at 50 ℃ for 12 hours;

[0042] (2) At 0° C., add 400 parts by weight of deionized water and 30 parts by weight of hydrogen peroxide at a concentration of 20 wt % to the mixture, and stir for 10 minutes;

[0043] (3) separate and wash the product successively with deionized water, hydrochloric acid of 20wt% concentration and absolute ethanol, and vacuum-dry to obtain graphene oxide;

[0044] (4) Disperse the graphene oxide in 20 parts by wei...

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PUM

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Abstract

The invention discloses a method for enhancing Cr<6+> photocatalysis of TiO2. By adopting titanium dioxide / aminated graphene oxide, the catalytic activity is 4.76 times as much as that of pure TiO2, and the photocatalysis capability on Cr<6+> is extremely improved.

Description

technical field [0001] The invention relates to the technical field of pollutant treatment, in particular to an enhanced TiO 2 Photocatalytic Cr 6+ Methods. Background technique [0002] Hexavalent chromium (Cr 6+ ) is one of the common heavy metal pollutants, which has strong carcinogenicity and teratogenicity, and can exist stably in the natural environment. Traditional Cr 6+ The treatment method is: add NaHSO 3 , FeSO 4 and other reducing agents to reduce Cr(VI) to Cr 3+ Afterwards, Cr(III) is precipitated in an alkaline solution to achieve the removal effect, but it requires a large consumption of reducing agent and may cause secondary pollution. Therefore, the development of efficient and environmentally friendly processing Cr 6+ method is imminent. [0003] TiO 2 As a green photocatalyst, it can donate electrons under the excitation of ultraviolet light to make Cr 6+ Restore faster. But because TiO 2 The photogenerated electrons are easy to recombine with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24A62D3/37A62D101/43
CPCA62D3/37B01J27/24A62D2101/43B01J35/39
Inventor 过冬
Owner 过冬