Photocatalytic membrane, preparation method thereof and degradation application of photocatalytic membrane on disinfection by-product precursor

A technology of disinfection by-products and photocatalytic film, applied in the field of photocatalytic degradation, can solve the problems of low utilization rate of sunlight, low reuse rate, easy loss of catalyst, etc. The effect of facilitating large-scale promotion

Active Publication Date: 2019-05-21
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve technical bottlenecks such as low utilization rate of sunlight, easy loss of catalyst, low reuse rate, and poor catalytic effect of photocatalytic technology in water treatment applications, the present invention proposes a pre-catalyst that can efficiently degrade disinfection by-products in the visible light region. Photocatalytic film of object and its preparation method, and its application to the degradation of disinfection by-product precursors under visible light

Method used

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  • Photocatalytic membrane, preparation method thereof and degradation application of photocatalytic membrane on disinfection by-product precursor
  • Photocatalytic membrane, preparation method thereof and degradation application of photocatalytic membrane on disinfection by-product precursor
  • Photocatalytic membrane, preparation method thereof and degradation application of photocatalytic membrane on disinfection by-product precursor

Examples

Experimental program
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Embodiment 1

[0064] (1) Configure 18ml of 10% ethanol aqueous solution, take 2ml of GO concentrated solution and place it in the ethanol solution, and ultrasonically disperse it for 3 hours. At this time, the concentration of GO ethanol solution is 1mg / ml. After centrifuging at a high speed for 15 minutes, take the upper suspension of the centrifuge tube for later use.

[0065] (2) Weigh 0.242g of sodium molybdate and 0.381g of thiourea and dissolve in 12.1ml of the above GO suspension, stir evenly, and disperse by ultrasonic.

[0066] (3) The mixed solution was transferred to a 50ml hydrothermal reaction kettle, heated to 210° C. in a muffle furnace, and the reaction was continued for 24 hours.

[0067] (4) The obtained product is centrifuged and washed 3 times at high speed with deionized water and ethanol to remove excess impurities or organic matter on the surface.

[0068] (5) Dry the product in an oven at 70°C for 12 hours, then grind it in an agate mortar for several times, and fil...

Embodiment 2

[0072] (1) Configure 18ml of 10% ethanol aqueous solution, take 2ml of GO concentrated solution and place it in the ethanol solution, and ultrasonically disperse it for 3 hours. At this time, the concentration of GO ethanol solution is 1mg / ml. After centrifuging at a high speed for 15 minutes, take the upper suspension of the centrifuge tube for later use.

[0073] (2) Weigh 0.242g of sodium molybdate and 0.381g of thiourea and dissolve in 24.2ml of the above GO suspension, stir evenly, and ultrasonically disperse.

[0074](3) The mixed solution was transferred to a 50ml hydrothermal reaction kettle, heated to 210° C. in a muffle furnace, and the reaction was continued for 24 hours.

[0075] (4) The obtained product is centrifuged and washed 3 times at high speed with deionized water and ethanol to remove excess impurities or organic matter on the surface.

[0076] (5) Dry the product in an oven at 70°C for 12 hours, then grind it in an agate mortar for several times, and fil...

Embodiment 3

[0080] The difference from Example 2 is only that the volume of the GO suspension in step (2) is 48.4ml.

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Abstract

The invention discloses a photocatalytic membrane, a preparation method thereof and degradation application of the photocatalytic membrane on a disinfection by-product precursor. The preparation method of the photocatalytic membrane comprises the following steps that molybdenum disulfide (MoS2) and graphene oxide (GO) are compounded to prepare a MoS2/RGO (reduced graphene oxide) compound; a polyvinylidene fluoride ultrafiltration membrane is provided and immersed in a Tris-dopamine hydrochloride solution to obtain a polydopamine loaded polyvinylidene fluoride ultrafiltration membrane; then theMoS2/RGO compound is dissolved in water and subjected to ultrasonic treatment, an aqueous solution of the MoS2/RGO compound is subjected to vacuum suction filtration on the polydopamine loaded polyvinylidene fluoride ultrafiltration membrane, and then vacuum drying is carried out to prepare the photocatalytic membrane. The preparation method of the photocatalytic membrane and the prepared photocatalytic membrane can be used for efficiently degrading the disinfection by-product precursor in a visible light area.

Description

technical field [0001] The invention relates to the technical field of photocatalytic degradation, in particular to a photocatalytic film, a preparation method thereof, and an application for degradation of disinfection by-product precursors. Background technique [0002] Since the 21st century, with the advancement of environmental analysis technology and the enhancement of people's environmental awareness, a new type of disinfection by-products - nitrosamines, has begun to receive widespread attention. Among them, nitrosodimethylamine (NDMA) is more representative. Due to the ubiquity of nitrosamines, strong toxic (carcinogenic) effects, and difficult treatment, they soon received widespread attention in the field of water treatment at home and abroad. Nitrosamines mainly come from the reaction of their precursors with disinfectants such as chlorine (amine) and oxidants such as ozone used in the water treatment process. Once the disinfection by-products of nitrosamines a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J27/051B01J35/06B01J37/34C02F1/30C02F1/72C02F101/30C02F101/34C02F101/38
Inventor 张正华邹雪
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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