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Photocatalytic nano-film and preparation method thereof, and degradation method of organic matters

A nano-film and photocatalytic technology, applied in the field of photocatalysis, can solve the problems of reducing photocatalytic efficiency, limiting applications, and high economic costs

Pending Publication Date: 2021-09-14
深圳市康弘智能健康科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the UV photon flux only accounts for 3%-5% of the entire solar spectrum, and the use of artificial UV light consumes a lot of energy and has high economic costs
In addition, the electrons injected into the conduction band (CB) of ZnO can easily recombine with the holes left in its valence band (VB), thereby reducing the photocatalytic efficiency. The above problems limit the application of pure ZnO photocatalysts in the field of wastewater treatment.

Method used

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  • Photocatalytic nano-film and preparation method thereof, and degradation method of organic matters
  • Photocatalytic nano-film and preparation method thereof, and degradation method of organic matters
  • Photocatalytic nano-film and preparation method thereof, and degradation method of organic matters

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preparation example Construction

[0048] see figure 1 , the present invention further proposes a method for preparing a photocatalytic nano film as described above, comprising the following steps:

[0049] S10, providing a barrier layer, and preparing a zinc oxide thin film on the barrier layer to obtain a composite film.

[0050] This step mainly prepares a composite film including a barrier layer and a zinc oxide film. The barrier layer can be purchased or prepared by yourself. When preparing by yourself, specifically, before step S10, it also includes:

[0051] S11, using the spray pyrolysis method, under heating conditions, the Zn(NO 3 ) 2 ·6H 2 The isopropanol solution of O was sprayed onto the substrate, and the spraying was repeated several times to form a barrier layer on the substrate.

[0052] The spray pyrolysis method refers to spraying the metal salt solution into a high-temperature atmosphere in the form of a mist, which immediately causes the evaporation of the solvent and the thermal decomp...

Embodiment 1

[0086] (1) Using the spray pyrolysis method, the Zn(NO 3 ) 2 ·6H 2 The isopropanol solution of O is sprayed onto the substrate, the single spraying time is 20s, and the spraying is repeated 10 times, and the time interval between two adjacent sprayings is 60s to form a barrier layer;

[0087] (2) Colloidal nano-zinc oxide is scraped onto the barrier layer and dried at 120°C for 30 minutes; after repeating the above steps 3 times, calcined at 500°C for 90 minutes and cooled to 50°C to obtain a semi-finished product; place the semi-finished product Zn(NO at 30mmol / L 3 ) 2 ·6H 2 O aqueous solution, and soaked at 60°C for 60min, washed and calcined at 500°C for 90min to form a zinc oxide film on the barrier layer, and separate the barrier layer and the zinc oxide film from the substrate as a whole peeled off to obtain a composite film;

[0088] (3) Soak the composite film in an absolute ethanol solution of lutein for 24 hours, take it out, wash it with ultrapure water, and d...

Embodiment 2

[0091] (1) Using the spray pyrolysis method, the Zn(NO 3 ) 2 ·6H 2 The isopropanol solution of O is sprayed onto the substrate, the single spraying time is 10s, and the spraying is repeated 5 times, and the time interval between two adjacent sprayings is 30s to form a barrier layer;

[0092] (2) Colloidal nano-zinc oxide is scraped onto the barrier layer, dried at 80°C for 40min; after repeating the above steps 5 times, calcined at 400°C for 120min, cooled to 40°C to obtain a semi-finished product; In Zn(NO 3 ) 2 ·6H 2 O aqueous solution, after soaking at 80°C for 30min, cleaning and calcining at 400°C for 120min, forming a zinc oxide film on the barrier layer, and removing the barrier layer and the zinc oxide film as a whole from the substrate peeled off to obtain a composite film;

[0093] (3) Soak the composite film in an absolute ethanol solution of lutein for 12 hours, take it out, wash it with ultrapure water, and dry it with compressed air to obtain a photocatalyt...

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Abstract

The invention discloses a photocatalytic nano-film and a preparation method thereof, and a degradation method of organic matters, and relates to the technical field of photocatalysis. The photocatalytic nano-film comprises a barrier layer and a nano-film layer which are stacked, and the nano-film layer is made of nano-zinc oxide and xanthophyll. The sensitization effect of the xanthophyll broadens the absorption of the catalyst to visible light, so that the light absorption of the photocatalytic nano-film is expanded to and covers most visible spectrum regions, the degradation efficiency of organic matters under visible light is improved to 98% or above, and the photocatalytic nano-film has more effective photo-generated charge carrier separation efficiency, so the photocatalytic nano-film remarkably enhances the photocatalytic degradation efficiency of the organic matters driven by visible light; and in addition, the photocatalytic nano-film shows high stability in cyclic utilization, the separation problem of a photocatalyst-solution is avoided, and the photocatalytic nano-film is convenient to recycle and reuse.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a photocatalytic nano film, a preparation method thereof, and a degradation method of organic matter. Background technique [0002] Organic matter is very common in people's daily life, and the pollution is also very serious. Taking acetaminophen (AAP) as an example, acetaminophen (AAP) is a commonly used antipyretic and analgesic drug. In life, most of the metabolized aminophenols in the human body are excreted through the intestines and feces, and are released into the natural environment in large quantities. Due to its drug-resistant molecular structure, AAP is difficult to be effectively degraded by conventional wastewater treatment, which may cause harm to the ecological environment and human health. Therefore, efficient and economical wastewater treatment technologies are urgently needed to effectively degrade it. [0003] Zinc oxide (ZnO) is a new type of multifunc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C02F1/30C02F101/30C02F101/34
CPCB01J31/0202C02F1/30C02F2101/30C02F2101/345C02F2305/10B01J35/39
Inventor 陈耀刚杨磊艾伟邹治学张宏增钟丹
Owner 深圳市康弘智能健康科技股份有限公司
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