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Heterogeneous ultraviolet-Fenton oxidation catalyst and preparation and application thereof

A Fenton oxidation, heterogeneous technology, applied in the direction of physical/chemical process catalysts, oxidized water/sewage treatment, chemical instruments and methods, etc., can solve the secondary pollution of iron-containing sludge, the catalyst is not easy to recycle, and the iron ions are easy to Loss and other problems, to achieve the effect of high utilization efficiency, easy separation, and enhanced bactericidal effect

Active Publication Date: 2015-03-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a new heterogeneous UV-Fenton oxidation catalyst to solve the problem of using homogeneous Fenton reagent agent loss and iron-containing sludge in the past. The problem of secondary pollution, and the problems of easy loss of iron ions, low treatment efficiency and difficult recovery of catalysts in existing heterogeneous Fenton oxidation catalysts; at the same time, establish a new preparation method for heterogeneous UV-Fenton oxidation catalysts

Method used

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  • Heterogeneous ultraviolet-Fenton oxidation catalyst and preparation and application thereof
  • Heterogeneous ultraviolet-Fenton oxidation catalyst and preparation and application thereof
  • Heterogeneous ultraviolet-Fenton oxidation catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare 32 mL of an aqueous solution of 2.5 mg / mL disodium dodecyl glutamate, add 0.48 mL of 0.1M HCl, and stir in a water bath at 80°C for 30 minutes; after cooling to room temperature, add ethanol according to the water:ethanol volume ratio of 1:1.35, and stir For 30 minutes, add 3-aminopropyltrimethoxysilane and orthosilicic acid according to the molar ratio of disodium dodecyl glutamate, 3-aminopropyltrimethoxysilane, and tetraethyl orthosilicate to 1:2.3:2.67 Ethyl ester, stirred at 30°C for 30 minutes; when the color of the solution was slightly milky white, insert a glass slide cleaned by ethanol ultrasound, let it stand at room temperature for 2 hours, take out the glass slide, ultrasonically in ethanol for 10 minutes, and dry at 80°C to obtain a SiO 2 mesoporous film. Will deposit mesoporous SiO with vertical channels 2 The glass slide of the film was placed in a mixed solution of ethanol / ethanolamine with a volume ratio of 1:5, refluxed at 80°C for 24h, rins...

Embodiment 2-4

[0042] Same as Example 1, change the template agent type, water and ethanol volume ratio, template agent, 3-aminopropyltrimethoxysilane, tetraethyl orthosilicate (i.e. template agent / APS / TEOS) mutual molar ratio to prepare, the same Obtained vertical channel SiO loaded with Prussian blue 2 Mesoporous thin films, as catalysts for Fenton oxidation, with H 2 o 2 Together they form a heterogeneous Fenton reagent. The surface of the film material obtained in Example 3 and Example 4 is relatively rough. The specific content is shown in Table 1:

[0043] Table 1

[0044]

Embodiment 5

[0046] Prepare 10 μM rhodamine B aqueous solution, adjust the pH value to 3.5, take 5ml and add it to a beaker wrapped in tin foil, put it in a dark box, and put the 1cm×1cm vertical channel SiO loaded with Prussian blue prepared in Example 1 2 Glass slides with mesoporous films, added with 1mM HO 2 o 2 , turn on the ultraviolet lamp and continue to irradiate the solution for 40 minutes, and the decolorization rate is 99%. Continuous repeated use 6 times, the decolorization rate reached 99%. The glass slides are stored in deionized water for 7 days and reused after 30 days, and the decolorization rate can still reach 99%.

[0047] It can be seen from the above examples that the method for preparing the heterogeneous Fenton oxidation catalyst of the present invention has simple process and mild conditions. Prussian blue is used as the iron source, and the Prussian blue is deposited on amino-functionalized SiO with vertical channels in a self-assembled manner. 2 On the mesopo...

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Abstract

The invention discloses a heterogeneous ultraviolet-Fenton oxidation catalyst and preparation and application thereof. Prussian blue is used as iron sources, the Prussian blue is deposited on an amino-functional SiO2 mesoporous film with vertical hole passages in an automatic assembly manner, the Prussian blue is fixed through the physical absorption and the interaction force between the positive and negative charges, the bonding is firm, and the loosing is avoided; the prepared catalyst is the film catalyst, the specific surface area is large, the utilization efficiency of active components is high, the catalytic efficiency is high, and compared with the powdery and granular catalysts, the separation and the recovery are easy. Because the catalyst is provided with the mesoporous passages which are vertically distributed, the internal diffusion resistance is little, and many organic matters are suitable for being treated; at the same time, the Prussian blue loaded by the catalyst contains various states of iron, so that the Prussian blue has a cooperating function; in addition, the preparation method disclosed by the invention is simple in technology and wild in condition, so that the preparation method is suitable for popularization and application.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a heterogeneous ultraviolet-Fenton oxidation catalyst and its preparation and application. Background technique [0002] Fenton's reagent refers to an oxidation system composed of hydrogen peroxide and ferrous ions. Hydrogen peroxide is added to an acidic solution containing ferrous ions, and hydrogen peroxide generates active hydroxyl radicals (·OH) under the catalysis of ferrous ions. Compared with other oxidants, hydroxyl radicals have a higher standard redox electrode potential, which is the theoretical basis for the stronger oxidative properties of Fenton's reagent. At present, as an advanced oxidation method, the Fenton reagent oxidation method has been widely used in the treatment of industrial wastewater containing refractory organic substances such as phenols, aromatic amines, pesticides and nuclear waste. The specific process of the method is to adjust the waste wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/26C02F1/32C02F1/72B01D53/86B01D53/72
Inventor 苏文琼车顺爱丁显廷
Owner SHANGHAI JIAO TONG UNIV
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