Preparation method of fiber photocatalyst

A photocatalyst and fiber technology, applied in the field of photocatalysis, can solve the problems of complex preparation process, high cost, difficult industrialized production, etc., and achieve the effects of simple preparation process, widening application fields and great application prospects.

Active Publication Date: 2018-04-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lin et al. prepared nano-TiO / Ag / AgBr modified glass fibers with plasmonic properties by sol-gel method combined with online reduction method, namely Ag-AgBr-TiO 2 / GF, which has a good photocatalytic degradation effect on methyl orange under visible light, and has good stability. The disadvantage is that the preparation process is complicated, and the cost is high, and it is difficult to industrialize production
In view of the process complexity, cost and output of electrospinning, it is difficult to promote industrialization
[0004] In summary, although these loading methods can fix nano-photocatalysts on fiber-like carriers to achieve the purpose of preparing recyclable photocatalysts, and make them have the characteristics of convenient separation and recovery after catalysis, there are high costs and complicated preparation processes. Insufficient, and the matrix is ​​easy to age in the photocatalytic process, the fixation fastness between the nano-photocatalyst and the matrix is ​​poor, it is still unable to meet the needs of convenient, cheap and efficient printing and dyeing wastewater treatment, no matter in terms of output or scale, it is difficult to meet the actual application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Preparation of mixed solvent: prepare mixed solvent with dimethyl sulfoxide / absolute ethanol in a volume ratio of 85 / 15 (v / v);

[0021] 2) Preparation of nano titanium dioxide dispersion: adding P25 to the mixed solvent prepared in step 1), and after ultrasonic dispersion, a solid content of 0.03 g / L nano titanium dioxide dispersion is obtained;

[0022] 3) Dip coating: the polyacrylonitrile fiber is passed through the nano titanium dioxide dispersion prepared in step 2) at a speed of 0.5m / s, then it is solidified in water, washed and dried; the drying condition is 30°C and vacuum drying for 12h to obtain the The fiber photocatalyst.

[0023] The fiber photocatalyst of the polyacrylonitrile fiber loaded nano-titanium dioxide prepared in this example can react with the rhodamine B dye (wherein, the wavelength of the ultraviolet light is 365nm, the radiation flux density is 7.6 mW / cm 2 , Concentration of 6ppm aqueous solution, fiber dosage of 1g / L) photocatalytic degradation...

Embodiment 2

[0025] 1) Prepare mixed solvent: prepare mixed solvent with dimethyl sulfoxide / absolute ethanol in a volume ratio of 85 / 15 (v / v);

[0026] 2) Preparation of nano-titanium dioxide dispersion: adding P25 to the mixed solvent prepared in step 1), and ultrasonic dispersion, to obtain a nano-titanium dioxide dispersion with a solid content of 0.05 g / L;

[0027] 3) Dip coating: After the polyacrylonitrile fiber is passed through the nano titanium dioxide dispersion prepared in step 2) at a speed of 1m / s, it is then solidified in water and formed, washed and dried; the drying condition is vacuum drying at 40°C to obtain the The fiber photocatalyst.

[0028] The fiber photocatalyst of the polyacrylonitrile fiber loaded nano-titanium dioxide prepared in this example can react with the rhodamine B dye (wherein, the wavelength of the ultraviolet light is 365nm, the radiation flux density is 7.6 mW / cm 2 , Rhodamine B dye concentration is 6ppm aqueous solution, fiber photocatalyst dosage is 1g / L...

Embodiment 3

[0030] 1) Prepare mixed solvent: prepare mixed solvent with dimethyl sulfoxide / absolute ethanol at a volume ratio of 80 / 20 (v / v);

[0031] 2) Preparation of nano titanium dioxide dispersion: adding P25 to the mixed solvent prepared in step 1), and after ultrasonic dispersion, a solid content of 0.01 g / L nano titanium dioxide dispersion is obtained;

[0032] 3) Dip coating: the polyacrylonitrile fiber is passed through the nanometer titanium dioxide dispersion prepared in step 2) at a speed of 0.5m / s, then it is solidified in water, washed and dried; the drying condition is vacuum drying at 45°C to obtain the Fiber photocatalyst.

[0033] The fiber photocatalyst of the polyacrylonitrile fiber loaded nano-titanium dioxide prepared in this example can react with the rhodamine B dye (wherein, the wavelength of the ultraviolet light is 365nm, the radiation flux density is 7.6 mW / cm 2 The photocatalytic degradation efficiency of dye concentration is 6ppm aqueous solution, fiber photocatal...

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PUM

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Abstract

The invention discloses a preparation method of a fiber photocatalyst. The preparation method comprises steps as follows: 1), an organic solvent is uniformly mixed with absolute ethyl alcohol, and a mixed solvent is obtained, wherein the organic solvent accounts for 75%-85% of the total volume of the mixed solvent; 2), nano-titanium dioxide is added to the mixed solvent obtained in the step 1) to be uniformly dispersed, and a nano-titanium dioxide dispersed solution is obtained; 3), polyacrylonitrile fiber is pulled to pass through the nano-titanium dioxide dispersed solution and enter a coagulating bath to be cured and formed, and the fiber photocatalyst is obtained through washing and drying. The preparation method is simple in process and suitable for industrialization, and a prepared product has lasting and stable photocatalysis and is easy to recover after being used.

Description

Technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a method for preparing a fiber photocatalyst. Background technique [0002] With the development of society and the acceleration of industrialization, water pollution has become more and more serious. Among them, the treatment of textile printing and dyeing industrial wastewater has the characteristics of large discharge, poor biodegradability and potential carcinogenicity, which has become a global environmental protection problem. Since Fujishima and Honda discovered irradiated TiO in 1972 2 Since the oxidation-reduction reaction of surface energy occurs, photocatalytic technology is a new water purification technology, and the research and application of its photocatalytic process have received extensive attention. Nano-titanium dioxide is favored by scientific researchers because of its high catalytic activity, good stability, no secondary pollution, and harmlessness to ani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C02F1/32C02F103/30
CPCY02W10/37
Inventor 赵健肖长发刘美琴田圣男王金凤
Owner TIANJIN POLYTECHNIC UNIV
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