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A PVDF ultrafiltration membrane modified by CDS/mil-101(cr) photocatalyst and its preparation method and application

A technology of photocatalyst and ultrafiltration membrane, which is applied in the field of membrane separation to achieve the effects of avoiding photocorrosion, improving photoresponse performance, and being easy to operate

Active Publication Date: 2021-02-02
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 CdS / MIL-101(Cr) instead of ultraviolet light photocatalyst to carry out blending modification on PVDF film, the prepared modified PVDF film has good anti-pollution and antibacterial properties under the irradiation of visible light, thus Solve the biofouling problem of PVDF membrane in the process of water treatment in an energy-saving, environmentally friendly and sustainable way

Method used

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  • A PVDF ultrafiltration membrane modified by CDS/mil-101(cr) photocatalyst and its preparation method and application
  • A PVDF ultrafiltration membrane modified by CDS/mil-101(cr) photocatalyst and its preparation method and application
  • A PVDF ultrafiltration membrane modified by CDS/mil-101(cr) photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of MIL-101(Cr) nanoparticles

[0047] Take 5g Cr(NO 3 ) 3 9H 2 O, 2g of terephthalic acid (BDC), 0.8mL of hydrofluoric acid (HF) and 70mL of deionized water were mixed and transferred to a high-temperature and high-pressure reactor for hydrothermal reaction at 210°C for 5h; after natural cooling, the mixture was heated at 8000rpm Centrifuge for 10 min, wash the obtained solid material three times with water and ethanol respectively; the washed product is redispersed in 100 mL of N,N-dimethylformamide and stirred for 12 h for purification, and the purified solid is transferred to 100 mL of ethanol , treated at 100° C. for 10 h; finally, the product was washed three times with ethanol and dried in a vacuum oven at 100° C. to obtain purified MIL-101 (Cr) nanoparticles.

[0048] (2) Preparation of CdS / MIL-101(Cr) nano photocatalyst

[0049] Weigh 5g MIL-101(Cr) and 2.5g Cd(AC) 2 2H 2 O was dispersed in 50mL dimethyl sulfoxide (DMSO), and the suspension...

Embodiment 2

[0060] (1) Preparation of MIL-101(Cr) nanoparticles

[0061] Take 4.8g Cr(NO 3 ) 3 9H 2 O, 1.9g of terephthalic acid (BDC), 0.6mL of hydrofluoric acid (HF) and 60mL of deionized water were mixed and transferred to a high-temperature and high-pressure reactor for hydrothermal reaction at 205°C for 6h; after natural cooling, the mixture was Centrifuge at 7500rpm for 15min, wash the obtained solid material three times with water and ethanol respectively; redisperse the washed product in 90mL N,N-dimethylformamide and stir for 11h for purification, and transfer the purified solid to 90mL ethanol , treated at 90°C for 11 h; finally, the product was washed three times with ethanol and dried in a vacuum oven at 90°C to obtain purified MIL-101(Cr) nanoparticles.

[0062] (2) Preparation of CdS / MIL-101(Cr) nano photocatalyst

[0063] Weigh 4.5g MIL-101(Cr) and 2g Cd(AC) 2 2H 2 O was dispersed in 45mL dimethyl sulfoxide (DMSO), and the suspension was transferred to a high-temperat...

Embodiment 3

[0071] (1) Preparation of MIL-101(Cr) nanoparticles

[0072] Take 4.5g Cr(NO 3 ) 3 9H 2 O, 1.8g terephthalic acid (BDC), 0.5mL hydrofluoric acid (HF) and 50mL deionized water were mixed and transferred to a high-temperature and high-pressure reactor, and hydrothermally reacted at 200°C for 7h; after natural cooling, the mixture was Centrifuge at 7000rpm for 20min, wash the obtained solid material three times with water and ethanol respectively; redisperse the washed product in 80mL N,N-dimethylformamide and stir for 10h for purification, and transfer the purified solid to 80mL ethanol at 80°C for 12h; finally, the product was washed three times with ethanol and dried in a vacuum oven at 80°C to obtain purified MIL-101(Cr) nanoparticles.

[0073] (2) Preparation of CdS / MIL-101(Cr) nano photocatalyst

[0074] Weigh 4g MIL-101(Cr) and 1.3g Cd(AC) 2 2H 2 O was dispersed in 40mL dimethyl sulfoxide (DMSO), and the suspension was transferred to a high-temperature and high-press...

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Abstract

The invention relates to a CdS / MIL-101 (Cr) photocatalyst-modified PVDF ultrafiltration membrane and its preparation method and application. In the ultrafiltration membrane, PVDF is used as a matrix and CdS / MIL-101 (Cr) photocatalyst is used as an active Components, active components are evenly distributed in the matrix; the modified PVDF ultrafiltration membrane is prepared from components including the following parts by weight: 17-19 parts of polyvinylidene fluoride, 2.5-3.5 parts of polyvinylpyrrolidone, N, 76-80 parts of N-dimethylacetamide, 0.5-1.5 parts of CdS / MIL-101 (Cr) photocatalyst; modified PVDF ultrafiltration membrane is used to resist organic pollutants or antibacterial membranes. Compared with the existing technology, the modified membrane provided by the present invention has high hydrophilicity and good photocatalytic activity. It can effectively reduce the blocking of membrane pores caused by organic pollutants under visible light irradiation, and is effective against Gram-negative bacteria represented by E. coli. Negative bacteria and Gram-positive bacteria represented by Staphylococcus aureus have good killing effect, can significantly inhibit the formation of biofilm on the membrane surface, and have good simultaneous anti-pollution and antibacterial effects.

Description

technical field [0001] The invention belongs to the technical field of membrane separation in water treatment, and relates to a CdS / MIL-101 (Cr) visible light photocatalyst modified PVDF ultrafiltration membrane and a preparation method and application thereof. Background technique [0002] Membrane separation technology has been widely favored at home and abroad because of its simple structure, convenient operation, ability to separate various substances in water, and operation at room temperature. It has the advantages of environmental protection, energy saving, low energy consumption, and low cost. Membrane materials are the basis of membrane separation technology and the key factor for the industrialization of membrane technology. However, serious membrane fouling (organic fouling, inorganic fouling, and biological fouling) is prone to occur during the membrane separation process, leading to increased membrane resistance and decreased membrane flux, leading to deteriorat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D65/02B01D65/08B01D61/14B01D71/34C02F3/12B01J31/26
CPCB01D67/0079B01D69/02B01D71/02B01D71/06B01D71/34B01D65/022B01D65/08B01D61/145C02F3/1268B01J31/26B01D2321/34B01D2325/10B01D2325/48B01J2531/0213B01J2531/62B01J35/39Y02W10/10
Inventor 王亚宜倪凌峰
Owner TONGJI UNIV
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