Preparation method of fiber photocatalyst

A photocatalyst and fiber technology, applied in the field of photocatalysis, can solve the problems of complicated preparation process, high cost, and difficult industrial production, and achieve the effect of simple preparation process, widening application field and great application prospect

Active Publication Date: 2015-12-30
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) Prepare a mixed solvent: prepare a mixed solvent with dimethyl sulfoxide / absolute ethanol at 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 ultrasonically dispersing to obtain a nano-titanium dioxide dispersion with a solid content of 0.03 g / L;

[0022] 3) Dip coating: pass the polyacrylonitrile fiber through the nano-titanium dioxide dispersion prepared in step 2) at a speed of 0.5 m / s, enter water to solidify and form, wash and dry; the drying condition is 30° C. for 12 hours in vacuum to obtain the obtained fiber photocatalyst.

[0023] The fiber photocatalyst of the polyacrylonitrile fiber loaded nano-titanium dioxide that the present embodiment makes, in the photocatalysis reaction of ultraviolet light irradiation 1h, to Rhodamine B dye (wherein, ultraviolet light wavelength is 365nm, radiation flux density 7.6 mW / cm 2 , concentration is 6ppm aqueous solution,...

Embodiment 2

[0025] 1) Prepare a mixed solvent: prepare a mixed solvent with dimethyl sulfoxide / absolute ethanol at 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 ultrasonically dispersing to obtain a nano-titanium dioxide dispersion with a solid content of 0.05 g / L;

[0027] 3) Dip coating: pass the polyacrylonitrile fiber through the nano-titanium dioxide dispersion prepared in step 2) at a speed of 1m / s, then enter water to solidify and form, wash and dry; the drying condition is vacuum drying at 40°C to obtain the obtained fiber photocatalyst.

[0028] The fiber photocatalyst of the polyacrylonitrile fiber loaded nano-titanium dioxide that the present embodiment makes, in the photocatalysis reaction of ultraviolet light irradiation 1h, to Rhodamine B dye (wherein, ultraviolet light wavelength is 365nm, radiation flux density 7.6 mW / cm 2 , Rhodamine B dye concentration is 6ppm aqueous s...

Embodiment 3

[0030] 1) Prepare a mixed solvent: prepare a 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 ultrasonically dispersing to obtain a nano-titanium dioxide dispersion with a solid content of 0.01 g / L;

[0032] 3) Dip coating: pass the polyacrylonitrile fiber through the nano-titanium dioxide dispersion prepared in step 2) at a speed of 0.5m / s, enter water to solidify and form, wash and dry; the drying condition is vacuum drying at 45°C to obtain the described fiber photocatalyst.

[0033] The fiber photocatalyst of the polyacrylonitrile fiber loaded nano-titanium dioxide that the present embodiment makes, in the photocatalysis reaction of ultraviolet light irradiation 1h, to Rhodamine B dye (wherein, ultraviolet light wavelength is 365nm, radiation flux density 7.6 mW / cm 2 , dye concentration is 6ppm aqueous solution, fib...

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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 preparation method of a fiber photocatalyst. Background technique [0002] With the development of society and the acceleration of industrialization, water pollution is becoming 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, and has become an environmental protection issue of global concern. Since the discovery of irradiated TiO by Fujishima and Honda in 1972 2 Since the surface energy redox reaction occurs, photocatalytic technology, as a new water purification technology, has received extensive attention in the research and application of its photocatalytic process. Nano-titanium dioxide is favored by researchers because of its high catalytic activity, good stability, no secondary pollution, and harmless to animals and...

Claims

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Application Information

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Patent Type & Authority Applications(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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