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Visible light photocatalyst, modified PVDF ultrafiltration membrane and preparation method and application thereof

A technology of photocatalyst and nano-photocatalyst, which is applied in the field of PVDF ultrafiltration membrane and its preparation, to achieve the effects of inhibiting the formation of biofilm on the surface of the membrane, good photocatalytic activity, and remarkable photocatalytic performance

Inactive Publication Date: 2020-06-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By using a new visible light photocatalyst Bi 2 MoO 6 / CuS instead of ultraviolet light photocatalyst for blending modification of PVDF membrane, the modified membrane has uniform distribution of pores, good photocatalytic activity, and the prepared modified PVDF membrane can induce oxidation on the surface of the membrane under the irradiation of visible light The highly active groups (such as hydroxyl radical·OH and oxyanion·O 2 – ), can kill the attached bacteria and degrade the attached organic pollutants, significantly inhibit the formation of biofilm on the surface of the membrane, have good anti-pollution and antibacterial properties, and achieve a good effect of membrane pollution control, so as to save energy, protect the environment, and be sustainable A sustainable way to solve the biofouling problem of PVDF membranes in the water treatment process

Method used

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  • Visible light photocatalyst, modified PVDF ultrafiltration membrane and preparation method and application thereof
  • Visible light photocatalyst, modified PVDF ultrafiltration membrane and preparation method and application thereof
  • Visible light photocatalyst, modified PVDF ultrafiltration membrane and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Bi 2 MoO 6 / CuS nano photocatalyst preparation

[0044] Weigh 5.1g Bi(NO 3 ) 3 ·5H 2 O and 1.28g Na 2 MoO 4 2H 2 Dissolve O in 30mL of ethylene glycol and keep stirring for 50min, slowly add 60mL of ethanol and keep stirring for 30min to form a uniform solution; transfer the mixed solution to a reaction kettle for hydrothermal reaction at 160°C for 17h, and cool to room temperature Washed with ethanol and distilled water, and dried at 80 °C to give pale green Bi 2 MoO 6 Powder; weigh 1g Bi 2 MoO 6 The powder was dispersed in distilled water by ultrasound for 30min, and 0.042g Cu(NO 3 ) 2 ·3H 2 O and 0.013g thioacetamide and continue to ultrasonically disperse for 30min; transfer the mixed solution to a reaction kettle for hydrothermal reaction at 160°C for 4h, wash with distilled water after cooling to room temperature, and dry at 60°C to obtain Bi 2 MoO 6 / CuS nanophotocatalyst.

[0045] figure 1 Is the Bi prepared in this example 2 MoO 6 / CuS p...

Embodiment 2

[0050] (1) Bi 2 MoO 6 / CuS nano photocatalyst preparation

[0051] Weigh 5.1g Bi(NO 3 ) 3 ·5H 2 O and 1.02g Na 2 MoO 4 2H 2 Dissolve O in 20mL of ethylene glycol and keep stirring for 40min, slowly add 40mL of ethanol and keep stirring for 20min to form a uniform solution; transfer the mixed solution to a reaction kettle for hydrothermal reaction at 150°C for 16h, and cool to room temperature Washed with ethanol and distilled water, and dried at 70 °C to give pale green Bi 2 MoO 6 Powder; weigh 1g Bi 2 MoO 6 Powder ultrasonic 20min dispersed in distilled water, add 0.025g Cu(NO 3 ) 2 ·3H 2 O and 0.008g thioacetamide and continue to ultrasonically disperse for 20min; transfer the mixed solution to a reaction kettle for hydrothermal reaction at 150°C for 3h, wash with distilled water after cooling to room temperature, and dry at 50°C to obtain Bi 2 MoO 6 / CuS nanophotocatalyst.

[0052] (2) Bi 2 MoO 6 Preparation of CuS modified PVDF ultrafiltration membrane ...

Embodiment 3

[0055] (1) Bi 2 MoO 6 / CuS nano photocatalyst preparation

[0056] Weigh 5.1g Bi(NO 3 ) 3 ·5H 2 O and 1.7g Na 2 MoO 4 2H 2 Dissolve O in 30mL of ethylene glycol and keep stirring for 60min, slowly add 60mL of ethanol and keep stirring for 40min to form a uniform solution; transfer the mixed solution to a reaction kettle for hydrothermal reaction at 170°C for 18h, and cool to room temperature Washed with ethanol and distilled water, and dried at 90 °C to give pale green Bi 2 MoO 6 Powder; weigh 1g Bi 2 MoO 6 The powder was dispersed in distilled water by ultrasound for 40min, and 0.125g Cu(NO 3 ) 2 ·3H 2 O and 0.039g thioacetamide and continue to ultrasonically disperse for 40min; transfer the mixed solution to a reaction kettle for hydrothermal reaction at 170°C for 5h, wash with distilled water after cooling to room temperature, and dry at 70°C to obtain Bi 2 MoO 6 / CuS nanophotocatalyst.

[0057] (2) Bi 2 MoO 6 Preparation of CuS modified PVDF ultrafiltrat...

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Abstract

The invention relates to a visible light photocatalyst, a modified PVDF ultrafiltration membrane and a preparation method and application thereof. In a Bi2MoO6 / CuS visible light photocatalyst, the mass ratio of Bi2MoO6 to CuS is (20-100): 1, and CuS is dispersed on the surface of Bi2MoO6 to form hollow flower-shaped spheres; in the ultrafiltration membrane, PVDF is used as a matrix, and a Bi2MoO6 / CuS nano photocatalyst is used as an active component; the ultrafiltration membrane is prepared from the following components in parts by weight: 17 to 19 parts of polyvinylidene fluoride, 2.5 to 3.5parts of polyvinylpyrrolidone, 77 to 79 parts of N, N-dimethylacetamide and 0.5 to 1.5 parts of Bi2MoO6 / CuS nano photocatalyst. Compared with the prior art, the modified membrane provided by the invention is uniform in membrane pore distribution and good in photocatalytic activity, can generate hydroxyl radicals and oxygen anions with an oxidation effect on the surface of the membrane under the irradiation of visible light, and can kill attached bacteria and degrade attached organic pollutants, so that the formation of a biological membrane on the surface of the membrane can be remarkably inhibited, and a good membrane pollution control effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation in water treatment and relates to a Bi 2 MoO 6 / CuS visible light photocatalyst, Bi 2 MoO 6 / CuS photocatalyst modified PVDF ultrafiltration membrane and its preparation method and application. Background technique [0002] Membrane bioreactor (MBR) has the characteristics of high biodegradation efficiency and low sludge yield, small footprint, strong nitrification capacity, and stable effluent quality. While MBR is being applied on a large scale, the problem of membrane fouling is still the main obstacle restricting the wider application of MBR. Surface modification of membrane materials by chemical oxidation treatment, plasma treatment, classical organic reaction and other methods is one of the effective means in membrane pollution control technology. The modification method of longer new membrane materials is still lacking. [0003] Membrane materials are the basis of MBR tech...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01D71/34B01D71/02B01D69/02B01D67/00C02F3/12C02F101/30
CPCB01J27/051B01D71/34B01D71/02B01D69/02B01D67/0079C02F3/1268B01D2325/10B01D2325/48C02F2101/30C02F2303/20C02F2303/14B01J35/39Y02W10/10
Inventor 王亚宜倪凌峰
Owner TONGJI UNIV
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