Novel method for loading silver phosphate photocatalyst on surface of cotton fabric

A surface-loaded, cotton fabric technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of not avoiding silver phosphate dust pollution, silver phosphate water dispersion Liquid instability, difficult to adapt to industrial production and other problems, to achieve the effects of excellent photocatalytic oxidation activity and reusability, easy modification of cost, strong bonding and shedding

Active Publication Date: 2021-05-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, silver phosphate powder is prepared first, and then it is made into an aqueous dispersion and then loaded onto the surface of cotton fabric [Ag 3 PO 4 / TiO 2 Preparation of loaded functional fabrics and their degradation of organic pollutants [D]. Zhejiang Sci-tech University, 2018.], this method has at least the following disadvantages: (1) it does not avoid silver phosphate dust pollution; (2) the prepared phosphoric acid The silver aqueous dispersion is unstable and difficult to adapt to industrial production; (3) the process route is too long and the preparation process is complicated; (4) the silver phosphate particles loaded on the fiber surface are unstable and easy to fall off from the fiber surface

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Novel method for loading silver phosphate photocatalyst on surface of cotton fabric
  • Novel method for loading silver phosphate photocatalyst on surface of cotton fabric
  • Novel method for loading silver phosphate photocatalyst on surface of cotton fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]1. Loading of silver phosphate: Weigh 1.5 grams of cotton fabric and modify it with citric acid to obtain surface carboxylated cotton fabric. The obtained modified cotton fabric was immersed in an aqueous solution of silver nitrate with a concentration of 0.05 mol / liter for 15 minutes at room temperature, and the soaked fabric was dehydrated by using a uniform paddle car. Then the fabric after dehydration is immersed in the disodium hydrogen phosphate aqueous solution with concentration of 0.2 mol / liter for 15 minutes, and then the impregnated fabric is dehydrated using a uniform paddle car. The above-mentioned padding process was repeated three times, and finally the obtained fabric was dried at 60° C. to obtain a silver phosphate-loaded modified cotton fabric, and the silver phosphate load on its surface was 29.0 mg / g;

[0023] 2. Surface modification of silver bromide: Weigh 75% potassium bromide relative to the mass of silver phosphate loaded on the surface of the mo...

Embodiment 2

[0026] 1. Silver nitrate concentration is set as 0.10 mol / liter, all the other steps are with the step 1 in the embodiment 1, and the silver phosphate load on the surface of silver phosphate loaded modified cotton fabric is 101.5 mg / gram.

[0027] 2. The process is the same as step 2 in Example 1.

[0028] 3. process is identical with step 3 in embodiment 1, gained fabric is recorded as AgBr / Ag 3 PO 4 -CA-Cotton-2.

Embodiment 3

[0030] 1. silver nitrate concentration is set as 0.20 mol / liter, and all the other steps are with the step 1 in the embodiment 1, the silver phosphate load on the surface of silver phosphate load modified cotton fabric is 196.3 mg / gram.

[0031] 2. The process is the same as step 2 in Example 1.

[0032] 3. process is identical with step 3 in embodiment 1, gained fabric is recorded as AgBr / Ag 3 PO 4 -CA-Cotton-3.

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Abstract

The invention designs a novel method for loading a silver phosphate photocatalyst on the surface of a cotton fabric. The method is characterized in that silver phosphate is firmly loaded on the surface of the modified cotton fabric through three steps, firstly, the silver phosphate is loaded, and in the process, synthesis of the silver phosphate and loading of the modified cotton fabric are synchronously carried out, so that the silver phosphate is firmly combined with fibers; secondly, the surface modification of the silver bromide not only effectively inhibits the photocorrosion phenomenon of the silver phosphate, but also enhances the load of the silver bromide on the fiber surface; and thirdly, after-treatment of the fixing agent is carried out, the binding strength of the silver phosphate and the fibers is further enhanced. When the prepared silver phosphate loaded modified cotton fabric is applied to dye wastewater purification treatment, the silver phosphate loaded modified cotton fabric has excellent photocatalytic oxidation activity and reusability under visible light. In addition, the method not only utilizes the characteristics that the cotton fabric is easy to modify and the like, but also overcomes the defects that the silver phosphate powder is easy to agglomerate and the like in the application process, so that the industrial application of the silver phosphate photocatalyst is promoted.

Description

technical field [0001] The invention belongs to the technical field of visible light catalytic materials, and in particular relates to a new method for loading silver phosphate photocatalysts on the surface of cotton fabrics. Background technique [0002] Silver phosphate (Ag 3 PO 4 ) is a visible light photocatalytic material with strong photocatalytic performance. Because of its direct bandgap width of 2.43eV and indirect bandgap width of 2.36eV, it can absorb sunlight with a wavelength less than 530nm, and visible light in the range of 400-800nm The apparent quantum yield of the region is as high as 90%, and it has the characteristics of visible light response, high separation efficiency of photogenerated electron-hole pairs, and extremely high photocatalytic activity. Ag 3 PO 4 The valence band edge is 2.85eV, which is much higher than that of H 2 O / O 2 Oxidation potential (1.23eV), the generated holes can directly absorb the adsorbed H 2 O molecules are oxidized ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C02F1/30C02F1/72C02F101/30
CPCB01J31/26B01J35/004C02F1/30C02F1/725C02F2101/308C02F2305/10Y02W10/37
Inventor 董永春严英文边立然于宽宽江标
Owner TIANJIN POLYTECHNIC UNIV
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