Preparation and photocatalytic degradation method of TiO2/SiO2 composite oxide

A composite oxide and photocatalytic technology, applied in the field of chemical experiments, can solve problems such as lack of drinking water

Inactive Publication Date: 2015-12-09
HUBEI NORMAL UNIV
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  • Abstract
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Problems solved by technology

[0004] Currently, more than a third of the planet's population still lack access to safe drinking water [30]

Method used

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  • Preparation and photocatalytic degradation method of TiO2/SiO2 composite oxide
  • Preparation and photocatalytic degradation method of TiO2/SiO2 composite oxide
  • Preparation and photocatalytic degradation method of TiO2/SiO2 composite oxide

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with accompanying drawing:

[0038] Reagents: tetra-n-butyl titanate (TBOT), tetraethyl orthosilicate (TEOS), urea, glacial HAc, PEG2000, glucose, terephthalic acid, rhodamine B, methyl orange, methylene blue, malachite green, twice distilled water;

[0039] Photocatalyst TiO 2 / SiO 2 Preparation of:

[0040] Preparation of C balls: 8gC 6 h 12 o 6 Soluble in 80mLH 2 O, transferred to a 100mL reactor, heated at 180°C for 6h, cooled naturally, washed with water and ethanol, centrifuged, and vacuum-dried at 80°C for 12h.

[0041] Add 10 mL of ethanol to 0.1 g of C balls and stir evenly, then add 4 mL of HCl (3M) dropwise and stir for 30 min, then add 1.1 mL of LTEOS dropwise and stir at room temperature for 24 h. Add 2.3mL HCl dropwise to 1.7mLTBOT, add 2.4mL ice HAc and stir for 30min, add 15mL ethanol and continue stirring, then add 0.6gPEG, 0.6gCO(NH 2 ) 2 Stir for 1h. The TBOT mixture was a...

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Abstract

The invention discloses preparation and a photocatalytic degradation method of a TiO2 / SiO2 composite oxide; a structure and optical properties of the catalyst are characterized by using X-ray diffraction, scanning electron microscope, specific surface area, ultraviolet-visible diffuse reflection, thermal gravimetric-differential thermal and fluorescence and other techniques. Terephthalic acid is used as a probe molecule, and the chemical fluorescence technique is combined for researching generation of hydroxyl free radicals of the TiO2 / SiO2 composite photocatalyst surface. Photocatalytic degradation of a rhodamine B solution shows that the TiO2 / SiO2 composite oxide has the degradation rate of 98.6% under visible light illumination for 40 min, while the degradation rate of pure TiO2 is only 11.9%. When the titanium-silicon molar ratio is 1 to 1, the TiO2 / SiO2 apparent first-order rate constant is more than 33 times that of pure TiO2 and is more than six times that of P25, the reason of photocatalytic activity enhancement is attributed to effective inhibition of hole-electron pair combination. After the TiO2 / SiO2 photocatalyst is reused for five times, the rhodamine B degradation rate can reach 89.2%. The degradation of the photocatalyst on rhodamine B has specificity.

Description

technical field [0001] The present invention relates to a kind of chemical experiment method, relate in particular to a kind of TiO 2 / SiO 2 Preparation of composite oxides and their photocatalytic degradation methods. Background technique [0002] Due to the advantages of strong oxidation ability, high catalytic activity, stable physical and chemical properties, low price and non-toxicity, TiO 2 It has become the most popular photocatalytic material in the field of photocatalysis such as wastewater treatment, air purification and self-cleaning. [1-3] . The hole-electron pair separation is only formed under the irradiation of ultraviolet light (λ<387.5nm), and ultraviolet light only accounts for 4.0% of sunlight, so the utilization rate of natural light is very low. The recombination of hole-electron pairs is the main reason for the reduction of photocatalytic activity [4] . Therefore, people pass TiO 2 modification to suppress the recombination of hole-electron pa...

Claims

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Application Information

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IPC IPC(8): B01J21/08C02F1/30C02F101/30C02F101/34
Inventor 杨水金杨志远沈光宇杨赟黄永葵
Owner HUBEI NORMAL UNIV
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