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Device and method for water treatment based on fluidic microbubble-photocatalytic coupling

A technology of water treatment and photocatalysis, applied in the direction of light water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of limiting the practical application of sunlight and reducing the efficiency of photocatalytic reactions

Active Publication Date: 2020-09-01
绿尔盛(重庆)环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although conventional photocatalysts such as TiO 2 Such catalytic performance has been recognized by many studies, but there are still two deficiencies: (1) in the utilization of sunlight, TiO 2 The bandgap width is wide (3.2eV), and it can only absorb light in the ultraviolet region, and the ultraviolet region only accounts for 4% of sunlight, which greatly limits its practical application to sunlight; (2) due to photogenerated electrons -Hole pairs are very easy to recombine, resulting in a decrease in photocatalytic reaction efficiency

Method used

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  • Device and method for water treatment based on fluidic microbubble-photocatalytic coupling
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  • Device and method for water treatment based on fluidic microbubble-photocatalytic coupling

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Embodiment approach

[0060] According to a preferred embodiment of the present invention, the photocatalytic film is a nano-titanium dioxide film, for example, a nano-titanium dioxide film supported on a Ni-based or Al-based porous foam film.

[0061] Among them, the photocatalytic effect of nano-titanium dioxide is used to degrade organic pollutants in water.

[0062] In a further preferred embodiment, the photocatalytic film is a modified nano-titanium dioxide film, for example, a modified nano-titanium dioxide film supported on a Ni-based or Al-based porous foam film.

[0063] Among them, traditional titanium dioxide photocatalysis can only absorb light in the ultraviolet range, and the ultraviolet range only accounts for 4% of sunlight, which greatly limits its practical application to sunlight. Therefore, the present invention uses modified titanium dioxide. The modified titanium dioxide can not only be photocatalyzed under ultraviolet light, but also can be photocatalyzed under visible light...

Embodiment 1

[0169] Example 1 N-doped TiO 2 Preparation of photocatalytic film

[0170] First measure 15mL of n-tetrabutyl titanate, add it dropwise into 100mL ultrapure water, and add 3mL concentrated HNO dropwise at the same time 3 Make it acidified, stir vigorously with a magnetic stirrer for 4 hours, and then add 30 mL of n-propanol. During this process, the colloidal solution gradually becomes completely transparent from translucent, and then add urea (25% w / v) to form a gel precursor.

[0171] An aluminum alloy substrate with a thickness of 1 mm was selected, ultrasonically cleaned with absolute ethanol and deionized water, and dried. Spread the gel precursor evenly on the aluminum substrate with a spatula, dry it at 100 °C, and then calcinate it at 400 °C for 2 h to finally prepare N-doped TiO 2 photocatalytic film.

[0172] The prepared N / TiO 2 Characterization of nanopowder materials such as Figure 4 shown. Figure 4 Middle (A) is the EDS-SEM image of the film material, (B)...

Embodiment 2

[0176] Connect the supply source 1 (air is provided in this embodiment 2), the control valve 2, the pressure regulating filter assembly 3, the flow meter 4, figure 2 As shown in the flow control component, an air diffuser 8 is arranged under the sewage treatment tank, and is connected to the flow control component and the sewage treatment tank through a drainage pipe. The working pressure of the supply source shall not exceed 3bar, and the flow rate shall be 0.2-0.3L / min. The sewage treatment tank is a quartz reactor with an outer casing diameter of 9 cm and an inner casing diameter of 5 cm. The total height of the reactor is about 6.5 cm, and the total volume is about 300 mL. The actual volume of treated water sample is about 200mL.

[0177] Set a hollow tube in the center of the sewage treatment tank, and set the light intensity of the hollow tube to 100mW / cm 2 A 300-W xenon lamp was used as a simulated sunlight light source. The diameter of the xenon lamp tube is 2.5cm,...

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Abstract

The invention discloses a flow control microbubble-photocatalysis coupling based water treatment device and a water treatment method. The device comprises a gas supply source (1), a flow control component (5) and a sewage treatment tank (6), wherein the sewage treatment tank (6) is internally provided with a photocatalysis membrane (7); and the photocatalysis membrane is a modified nano titanium dioxide membrane. According to the device and the method, flow control microbubble aeration is used for increasing a content of dissolved oxygen in water, strengthening gas-liquid mass transfer performance and further increases a photocatalysis speed; and at the same time, a photocatalysis system generates photo-induced electrons, can synchronously promote generation of hydroxyl radicals in a microbubble breakage process and is applicable to water treatment.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to water treatment using microbubble technology, in particular to a device and method for water treatment based on fluidic microbubble-photocatalytic coupling. Background technique [0002] Water resource regeneration and recycling is an important way to solve the current water supply crisis and curb the deterioration of the water environment. The research and development of water treatment technology is the key to this field. Surface water, groundwater, sewage, secondary effluent of sewage treatment plants, reclaimed water and other water bodies have a large amount of refractory biodegradable dissolved organic matter remaining. Traditional physical and chemical methods or the need to add persistent chemicals may easily cause secondary pollution, or Due to complex process and high cost, it is subject to various restrictions. [0003] Photocatalytic technology is based on the principl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F7/00C02F101/30
CPCY02W10/10
Inventor 范伟霍明昕
Owner 绿尔盛(重庆)环境科技有限公司