Doping-modified TiO2 photocatalytic thin film, and preparation method and application thereof

Abstract

The invention provides a doping-modified TiO2 photocatalytic thin film, and a preparation method and an application thereof, wherein the preparation method includes: performing composite doping modification on TiO2 thin film by using ferrous ion and iodate ion, thus effectively improving the photocatalytic absorption wavelength of the TiO2 photocatalytic thin film to 375-395 nm. The thin film is wide in photo-responding range and can employ a light-emitting diode as a photo-catalytic light source. The photocatalytic activity of the doping-modified TiO2 photocatalytic thin film is high, so thatthe thin film can be widely applied to edible oil processing field and can effectively photo-catalytically degrade aflatoxin in edible oil, and has very great 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...

Examples

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]

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...

Examples

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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