A doped modified tio 2 Photocatalytic film and its preparation method and application

A photocatalytic thin film and photocatalytic technology, applied in the field of photocatalysis, can solve the problems of narrow photoresponse range, low photocatalytic efficiency and high cost, and achieve the effect of improving photocatalytic activity

Active Publication Date: 2021-07-09
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Prior art ("Food Industry Science and Technology" 2018 (11): 253-257) discloses the use of TiO 2 The ultraviolet photocatalytic degradation of aflatoxin in peanut oil has achieved good results, but when using TiO 2 There is a narrow photoresponse range and low photocatalytic efficiency in visible light wavelengths. Generally, photocatalysis needs to be carried out at a wavelength of 254nm (ultraviolet light wavelength), and a high-cost ultraviolet lamp must be equipped as an electric light source.

Method used

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  • A doped modified tio <sub>2</sub> Photocatalytic film and its preparation method and application
  • A doped modified tio <sub>2</sub> Photocatalytic film and its preparation method and application
  • A doped modified tio <sub>2</sub> Photocatalytic film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A doped modified TiO 2 The preparation method of photocatalytic thin film, comprises the following steps:

[0038] S1. The nanometer TiO of model is P25 2 Added to distilled water, formulated to contain nano-TiO 2 Aqueous solution, in which TiO 2 The mass fraction is 0.15%;

[0039] Add PVP-K30 to distilled water to prepare an aqueous solution containing PVP-K30, wherein the mass fraction of PVP-K30 is 15%;

[0040] Under constant stirring, will contain nano-TiO 2 Add the aqueous solution containing PVP-K30 to the aqueous solution containing PVP-K30, and add nitric acid to adjust the pH value of the solution to 3, continue stirring for 0.5h, and then use 500W ultrasonic wave for 30min to form stable nano-TiO 2 Sol; the above nano-TiO containing polyvinylpyrrolidone 2 Sol, Nano TiO 2 The mass ratio to polyvinylpyrrolidone is 1:100.

[0041] Immerse the quartz glass tube into the above nano-TiO containing polyvinylpyrrolidone 2 In the sol, dipping, the dipping ti...

Embodiment 2～4

[0045] Embodiment 2~4 and comparative example 1~5

[0046] The preparation methods of the following examples and comparative examples are basically the same as those of Example 1, the difference from Example 1 lies in the ratio of n(Ti) to n(Fe), and the ratio of n(Ti) to n(I). Please see Table 1 for details:

[0047] Table 1

[0048]

[0049]

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Abstract

The invention provides a doped modified TiO 2 Photocatalytic thin film and its preparation method and application. The preparation method adopts successively ferrous ion and iodate ion to TiO 2 The compound doping modification of the thin film effectively improves the TiO 2 The photocatalytic absorption wavelength of the photocatalytic thin film is 375-395nm, the photoresponse range is wide, and the light-emitting diode can be used as the photocatalytic light source. The doped modified TiO of the present invention 2 The photocatalytic film has high photocatalytic activity, can be widely used in the field of edible oil processing, can effectively photocatalyze the degradation of aflatoxin in edible oil, and has a very broad application prospect.

Description

technical field [0001] The invention relates to the field of photocatalysis, more specifically, to a doped modified TiO 2 Photocatalytic thin film and its preparation method and application. Background technique [0002] Aflatoxin B1 (abbreviated as AFB1) is a derivative of dihydrofuranoxinone. AFB1 is highly toxic to humans and some animals, and its toxic effect is mainly to damage the liver. It is the most carcinogenic among known chemical substances. AFB1 exists in various nuts, especially peanuts, and is generally most polluted in tropical and subtropical areas with high temperature and high humidity in South China. In domestic freshly squeezed peanut oil, especially in peanut oil workshops, the detection rate of AFB1 is relatively high, and the content is often higher than the limit stipulated in my country's food hygiene standards (AFB1 allowable amount ≤ 20μg / kg). Aflatoxin is heat-resistant and can only be cracked at 280°C, so it is difficult to destroy under norm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/128C11B3/02A23L5/20
CPCA23L5/276B01J27/128B01J35/004C11B3/02
Inventor 叶盛英徐程鹏宋贤良崔晓蕾
Owner SOUTH CHINA AGRI UNIV
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