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A kind of high-efficiency solar nitrogen fixation photocatalytic material and preparation method thereof

A technology of photocatalytic materials and solar energy, which is applied in the field of high-efficiency solar nitrogen fixation photocatalytic materials and its preparation, can solve the problems of high photogenerated carrier recombination rate, low quantum efficiency, and low solar energy utilization rate, and achieve high photocatalytic nitrogen fixation activity, high stability effect

Active Publication Date: 2019-07-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for TiO 2 , there are several key technical challenges, such as TiO 2 The band gap of TiO is 3.2eV, which can only be excited by ultraviolet light (accounting for only 3.8% of solar energy). In addition, TiO 2 The recombination rate of photogenerated carriers is high, the quantum efficiency is low (less than 4%), the utilization rate of solar energy is low, and there is almost no photoresponse in the visible light range; when it is used for photocatalytic nitrogen fixation, it can only produce 1-10μmol / L Ammonia nitrogen

Method used

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  • A kind of high-efficiency solar nitrogen fixation photocatalytic material and preparation method thereof
  • A kind of high-efficiency solar nitrogen fixation photocatalytic material and preparation method thereof
  • A kind of high-efficiency solar nitrogen fixation photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 1.2mmoL sodium oleate in 20mL deionized water, add 0.194g Bi(NO 3 ) 3 ·5H 2 O, magnetically stirred for 1.5 hours to form an emulsion precursor solution;

[0039] Dissolve 0.4mmoL ammonium metavanadate in 20mL deionized water, stir for 1 hour and ultrasonically disperse evenly;

[0040] The two groups of solutions were mixed and stirred for 1 hour, then transferred to a 50 mL hydrothermal kettle, hydrothermally reacted at 105°C for 16 hours, and cooled naturally to room temperature;

[0041] The solid sample in the hydrothermal kettle is washed with n-hexane, ethanol, etc., and then the powder is obtained by vacuum freeze-drying technology, which is BiO / BiVO 4 composite material.

[0042] figure 1 It is the BiO / BiVO obtained in this embodiment 4 The XRD diffraction pattern of the composite material, the XRD component analysis shows that: the obtained composite photocatalytic material is a monoclinic phase BiVO 4 BiO with a small amount of hexagonal phase...

Embodiment 2

[0050] Dissolve 2.2mmoL sodium oleate in 20mL deionized water, add 0.194g Bi(NO 3 ) 3 ·5H 2 O, magnetically stirred for 1.5 hours to form an emulsion-like precursor solution, added 20 mL of deionized water to the precursor solution, then transferred to a 50 mL hydrothermal kettle, reacted at 105 ° C for 20 hours, and cooled naturally to room temperature;

[0051] The solid sample is washed with ethanol, etc., and then the powder is obtained by vacuum freeze-drying technology, which is the BiO material.

[0052] Known through XRD detection analysis (see Figure 4 ): The material obtained in this embodiment is a BiO material (quantum sized BiO (quantum sized BiO)).

[0053] Compared with the composite material obtained in Example 1, the BiO material obtained in this example reduces nitrogen in air to produce NH under the same conditions. 4 + is slightly less efficient (see image 3 ).

Embodiment 3

[0055] Dissolve 1.2mmoL sodium oleate in 20mL deionized water, add 0.194g Bi(NO 3 ) 3 ·5H 2 O, magnetically stirred for 1.5 hours to form an emulsion precursor solution;

[0056] Dissolve 0.1mmoL sodium tungstate in 20mL deionized water, stir for 1 hour and ultrasonically disperse evenly;

[0057] The two groups of solutions were mixed and stirred for 1 hour, then transferred to a 50 mL hydrothermal kettle, hydrothermally reacted at 105°C for 16 hours, and cooled naturally to room temperature;

[0058] The solid sample in the hydrothermal kettle is washed by n-hexane, ethanol, etc., and then the powder is obtained by vacuum freeze-drying technology, which is BiO, Bi 2 o 3 , Bi 2 o 2.33 / Bi 2 WO 6 composite material.

[0059] The Bi obtained in this example 2 o 3-x Composite Bi 2 WO 6 The photocatalytic material obtains BiO / BiVO under the same conditions as in Example 1 4 The photocatalytic nitrogen fixation efficiency of the material is 85% of that of Example 1.

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Abstract

The invention relates to an efficient solar nitrogen-fixing photocatalytic material and a preparation method thereof. The chemical composition of the photocatalytic material is Bi. 2 O 3‑x / nBi a MO b , where x=0~1, n=0~1, a=0~2, b=0~6, and M is at least one of V, Mo, and W. The photocatalytic material of the present invention includes bismuth-based oxide Bi 2 O 3‑x (x=0~1) or its and Bi a MO b (M=V, Mo, W) photocatalytic material composite material, the photocatalytic material of the present invention not only has extremely high photocatalytic nitrogen fixation activity, but also has extremely high stability. Bi in this material 2 O 3‑x (x=0~1) can adsorb and activate nitrogen in the air, promote the breakage of the nitrogen-nitrogen triple bond, and generate ammonia in water.

Description

technical field [0001] The invention relates to a high-efficiency solar nitrogen-fixing photocatalytic material and a preparation method thereof, belonging to the technical field of photocatalytic materials. Background technique [0002] Ammonia provides nitrogen for plants, especially food crops, and is widely used in industry. It is the chemical product with the largest output in the world except sulfuric acid. At present, the largest amount is used in chemical fertilizers. The traditional ways of nitrogen fixation mainly include biological nitrogen fixation and chemical nitrogen fixation. Biological nitrogen fixation can be carried out under relatively mild conditions, but it can only occur in a small number of plants and microorganisms, making it difficult for large-scale production and application. Chemical nitrogen fixation effectively solves the deficiency of biological nitrogen fixation, but the whole process consumes a lot of energy, and a large amount of use not o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J23/18B01J23/31C02F1/30
CPCC02F1/30B01J23/002B01J23/18B01J23/22B01J23/31B01J35/39
Inventor 王文中孙松美
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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