A compound type near-infrared light photocatalyst and its preparation method and application

A near-infrared light and photocatalyst technology is applied in the field of photocatalytic degradation of pollutants, which can solve the problems of low efficiency of organic pollutants, and achieve the effects of simple preparation method, promotion of carrier separation, and improvement of efficiency and speed.

Active Publication Date: 2022-05-03
浙江省科创新材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Highly oxygen-doped cerium fluoride (CeF 3 -O) is a photocatalyst with a unique intermediate energy band structure. The two band gaps are 1.7eV and 2.9eV respectively. , to carry out photocatalytic reactions of visible light and near-infrared light respectively, but the efficiency of near-infrared photocatalytic degradation of organic pollutants is much lower than that under visible light

Method used

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  • A compound type near-infrared light photocatalyst and its preparation method and application
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  • A compound type near-infrared light photocatalyst and its preparation method and application

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Effect test

Embodiment 1

[0032] 20mg CeF 3 -O and 0.85 mg AgNO 3 Mix evenly to obtain a compound near-infrared photocatalyst, and store it away from light for future use.

[0033] Dissolve the prepared compound near-infrared photocatalyst in 50ml of tetracycline hydrochloride (20mg / L) solution by ultrasonic dispersion, react in dark for 30min, and then illuminate under 300w xenon lamp (filter: λ>680nm) , Sampling and testing every 30 minutes.

[0034] It was found that, if figure 1 Shown are the degradation efficiency (a) and rate (b) curves of the composite near-infrared photocatalyst under near-infrared light for the degradation of tetracycline hydrochloride. It can be seen from the figure that the compound near-infrared photocatalyst has a degradation efficiency of 73.1% for tetracycline hydrochloride within 180 min, and the kinetic reaction rate k of the first order reaction is 4.5×10 -3 min -1 .

Embodiment 2

[0036] 20mg CeF 3 -O and 0.5mg EDTA-2Na are evenly mixed to obtain a compound near-infrared photocatalyst, which can be stored in the dark for future use.

[0037] Dissolve the prepared compound near-infrared photocatalyst in 50ml of tetracycline hydrochloride (20mg / L) solution by ultrasonic dispersion, react in dark for 30min, and then illuminate under 300w xenon lamp (filter: λ>680nm) , Sampling and testing every 30 minutes.

[0038] It was found that, if figure 2 Shown are the degradation efficiency (a) and rate (b) curves of the composite near-infrared photocatalyst under near-infrared light for the degradation of tetracycline hydrochloride. It can be seen from the figure that the compound near-infrared light photocatalyst has a degradation efficiency of 70.4% for tetracycline hydrochloride within 120 min, and the kinetic reaction rate k of the first order reaction is 9.3×10 -3 min -1 .

Embodiment 3

[0040] 20mg CeF 3 -O and 1.02mg AgNO3 Mix evenly to obtain a compound near-infrared photocatalyst, and store it away from light for future use.

[0041] Dissolve the prepared compound near-infrared photocatalyst in 50ml of tetracycline hydrochloride (20mg / L) solution by ultrasonic dispersion, react in dark for 30min, and then illuminate under 300w xenon lamp (filter: λ>680nm) , Sampling and testing every 30 minutes.

[0042] It was found that the degradation efficiency of the compound near-infrared photocatalyst to tetracycline hydrochloride was 72.8% within 180 min, and the reaction rate k of the first-order reaction kinetics was 4.5×10 -3 min -1 .

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Abstract

The invention discloses a composite near-infrared photocatalyst and its preparation method and application, wherein, CeF 3 ‑O is the main catalyst, silver nitrate is the co-catalyst, compounded according to a certain ratio, under near-infrared light, the Ag nanoparticles are deposited on the CeF 3 The ‑O surface promotes carrier separation through the surface plasmon resonance effect and efficiently degrades tetracycline hydrochloride. where CeF 3 As the main catalyst, ‑O has a unique intermediate energy level structure, which can directly absorb near-infrared light to generate photogenerated electron‑hole pairs, and has similarities with composite catalysts that utilize the surface plasmon resonance effect of Ag nanoparticles for near-infrared catalysis through hot electron injection. essential difference. In addition, with CeF 3 ‑O is the main catalyst, disodium edetate is the co-catalyst, and the near-infrared photocatalyst compounded in a certain proportion can also efficiently degrade tetracycline hydrochloride. The process of the invention is simple, the compound photocatalyst has good near-infrared light response, and effectively improves the degradation efficiency of tetracycline hydrochloride.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation of pollutants, and in particular relates to a composite near-infrared light photocatalyst and its preparation method and application. Background technique [0002] Semiconductor photocatalysis is a technology that can effectively use solar energy for photoelectric conversion to treat environmental organic pollutants, and plays an important role as a bridge between modern industrial development and environmental protection. Rare earth semiconductor materials have been widely used as catalysts in many important industrial waste gas treatment processes. [0003] Highly oxygen-doped cerium fluoride (CeF 3 -O) is a photocatalyst with a unique intermediate energy band structure. The two band gaps are 1.7eV and 2.9eV respectively. , to perform photocatalytic reactions under visible light and near-infrared light, respectively, but the efficiency of near-infrared photocatalytic degrada...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/25B01J27/06B01J31/26C01F17/265C01F17/10C02F1/30C02F101/38C02F101/34C02F101/36
CPCB01J27/25B01J27/06B01J31/26B01J35/004C01F17/265C01F17/10C02F1/30C02F2305/10C02F2101/34C02F2101/36C02F2101/38
Inventor 王智宇韩冰
Owner 浙江省科创新材料研究院
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