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Squarylium cyanine dye sensitized titanium dioxide visible light catalyst, and preparation method and application thereof

A titanium dioxide and dye sensitization technology, applied in the field of photocatalysis, can solve the problems of difficult purification, unfavorable promotion and application, high production cost, and achieve the effects of high photocatalytic activity, simple process and easy control.

Inactive Publication Date: 2012-09-26
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phthalocyanine dyes have disadvantages such as high production cost and difficulty in purification, which are not conducive to practical application. Therefore, choosing a sensitizer dye with a suitable structure, easy synthesis, and excellent performance is the key to preparing titanium dioxide visible light catalysts.

Method used

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  • Squarylium cyanine dye sensitized titanium dioxide visible light catalyst, and preparation method and application thereof
  • Squarylium cyanine dye sensitized titanium dioxide visible light catalyst, and preparation method and application thereof
  • Squarylium cyanine dye sensitized titanium dioxide visible light catalyst, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Mix 15ml of tetrabutyl titanate and 45ml of absolute ethanol to obtain solution A. Take another 32 ml of anhydrous ethanol, adjust the pH to 2~3 with nitric acid, add dropwise to the above-mentioned mixture of tetrabutyl titanate and anhydrous ethanol, stir for 1 hour to mix them thoroughly, and obtain a transparent titanium dioxide sol. After the transparent sol is mixed with 6g of phenol, it is added to the n-heptane dispersion medium, and 8ml of formaldehyde aqueous solution is added dropwise under thorough stirring, and the temperature is raised to 70 ℃ for reaction. After about 1.5 hours, a milky white colloidal liquid is obtained, which is dried at 80 ℃ After calcination at 400℃, titanium dioxide nanoparticles are obtained. The scanning electron micrograph of the nanoparticles is as follows figure 1 Shown.

[0027] The above method was used to prepare nano-titanium dioxide and 2,3,3-trimethyl-3H indole substituted squaraine dye [R 1 H, R 2 Is C(CH 3 ), X is H] and 40...

Embodiment 2

[0029] Substitute the squaraine dye [R] with nano-sized titanium dioxide P25 and 2,3,3-trimethyl-3-ethylindole 1 Is C 2 H 5 ,R 2 Is C(CH 3 ), X is H] and 60ml methanol are added to a single-necked flask, where the mass ratio of nano-titanium dioxide to 2,3,3-trimethyl-3-ethylindole substituted squaraine dye is 100:10, At a temperature of ℃, the mixture was treated with a frequency of 20kHz and an ultrasonic power of 1000W for 0.5 hours, then the methanol solvent was evaporated to dryness, and the solid was dried at 60℃ to obtain 2,3,3-three Methyl-3H indole substituted squaraine dye sensitized titanium dioxide visible light catalyst.

Embodiment 3

[0031] Example 1 prepared nano-titanium dioxide and N-methylbenzothiazole substituted squaraine dye [R 1 For CH 3 ,R 2 Is S, X is H] and 40ml chloroform are added to a single-necked flask, where the mass ratio of nano-titanium dioxide to N-methylbenzothiazole substituted squaraine dye is 100:2, and the mixture is heated at 40℃ The frequency is 30kHz and the ultrasonic power is 500W for 5 hours, then the chloroform solvent is evaporated to dryness, and the obtained solid is dried at 60℃ to obtain N-methylbenzothiazole substituted squaraine dye sensitized Titanium dioxide visible light catalyst.

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Abstract

The invention relates to the technical field of photocatalysis, particularly a squarylium cyanine dye sensitized titanium dioxide visible light catalyst, and a preparation method and application thereof. The preparation method comprises the following steps: mixing titanium dioxide with squarylium cyanine dye and an organic solvent, carrying out ultrasonic treatment on the mixture at 20-40 DEG C for 0.5-6 hours, wherein the ultrasonic frequency is 20-100kHz, and the ultrasonic power is 400-4000W; and drying the organic solvent by distillation to obtain the squarylium cyanine dye sensitized titanium dioxide visible light catalyst. The squarylium cyanine dye sensitized titanium dioxide visible light catalyst under the irradiation of visible light or sunlight can effectively degrade methylene blue and other organic wastewater pollutants, has high photocatalytic activity, and solves the technical problems of low visible light utilization ratio and low catalytic activity in the existing titanium dioxide photocatalyst. The preparation method provided by the invention has the advantage of simple technique, is easy to control and is suitable for industrial production and application.

Description

[0001] Technical field [0002] The invention belongs to the technical field of photocatalysis, and specifically relates to the preparation and application of a squaraine dye-sensitized titanium dioxide visible light catalyst. This visible light catalyst can effectively utilize visible light in sunlight, thereby improving the photocatalytic quantum efficiency and broadening the spectral response . Background technique [0003] Nano TiO 2 Due to its high catalytic activity, stable chemical properties and non-toxicity, photocatalysts are currently recognized as ideal photocatalytic materials and have broad application prospects in environmental pollution control. However, currently TiO 2 The photocatalytic oxidation technology is mainly at the level of laboratory simulation treatment and has not been put into large-scale practical application. This is mainly due to TiO 2 In the process of practical application, there are bottlenecks that cannot be broken by itself: (1) The band gap...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01D53/86C02F1/30
CPCY02W10/37
Inventor 李忠玉房永玲徐松钱健吴春晖
Owner CHANGZHOU UNIV
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