Photocatalytic film and its preparation method and application to the degradation of disinfection by-product precursors

A disinfection by-product and photocatalytic membrane technology, applied in the field of photocatalytic degradation, can solve the problems of low utilization rate of sunlight, poor catalytic effect, low reuse rate, etc., to improve photocatalytic activity and facilitate large-scale promotion , the effect of high reuse rate

Active Publication Date: 2021-07-27
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 film and its preparation method and application to the degradation of disinfection by-product precursors
  • Photocatalytic film and its preparation method and application to the degradation of disinfection by-product precursors
  • Photocatalytic film and its preparation method and application to the degradation of disinfection by-product precursors

Examples

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Effect test

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 film and its preparation method, and its application to the degradation of disinfection by-product precursors, wherein the preparation method of the photocatalytic film comprises the following steps: molybdenum disulfide (MoS 2 ) combined with graphene oxide (GO) to produce MoS 2 / RGO (reduced graphene oxide) composite; polyvinylidene fluoride ultrafiltration membrane is provided, and the polyvinylidene fluoride ultrafiltration membrane is immersed in Tris-dopamine hydrochloride solution to obtain polyvinylidene fluoride-loaded polyvinylidene fluoride ultrafiltration membrane ; then the MoS 2 / RGO composite dissolved in water and sonicated, the MoS 2 The aqueous solution of the / RGO complex was vacuum filtered on a polyvinylidene fluoride ultrafiltration membrane supported by polymerized dopamine, and then vacuum-dried to prepare a photocatalytic membrane. The preparation method of the photocatalytic film proposed by the invention and the prepared photocatalytic film can efficiently degrade the precursors of disinfection by-products in the visible light region.

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 Patents(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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