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Application method of lanthanum titanate nano-sheet to photocatalysis nitrogen fixation

An application method and nanosheet technology, applied in the direction of chemical instruments and methods, applications, titanate, etc., can solve problems such as low efficiency and achieve stable performance

Active Publication Date: 2019-03-29
北京利特沃环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 When used as a photocatalyst for nitrogen fixation, there are also problems such as low efficiency.

Method used

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  • Application method of lanthanum titanate nano-sheet to photocatalysis nitrogen fixation
  • Application method of lanthanum titanate nano-sheet to photocatalysis nitrogen fixation
  • Application method of lanthanum titanate nano-sheet to photocatalysis nitrogen fixation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] First weigh 200mg of the prepared La 2 Ti 2 o 7 That is, LTO was heat-treated at 400°C for 3 hours under an argon-hydrogen atmosphere (5% hydrogen + 95% argon) to prepare LTO samples containing oxygen vacancies, and the gas flow rate was 0.2 L / min.

[0054] Then weigh 30 mg of the LTO sample before and after heat treatment, add 30 mL of deionized water to the reaction test tube, connect it to the gas cylinder, plug the rubber stopper, light, nitrogen, the flow rate is 0.1 L / min, and draw 3 mL every 1 h The reaction solution was centrifuged to obtain a supernatant for later use. Take 1mL supernatant and mix with prepared 1mL Nessler's Reagent (Nessler's Reagent), put it into a spectrophotometer to measure the absorbance, take NH 4+ The absorbance value record at the 420nm place of the absorbance maximum position, and then compare with the absorbance of the ammonia nitrogen standard solution, finally obtain the concentration of ammonia nitrogen in the reaction solution...

Embodiment 2

[0056] First, weigh 200 mg of the prepared LTO and heat-treat it at 600 degrees for 3 hours under an argon-hydrogen atmosphere (5% hydrogen + 95% argon) to prepare an LTO sample containing oxygen vacancies, with a gas flow rate of 0.2 L / min;

[0057] Then weigh 30 mg of the LTO sample before and after heat treatment, add 30 mL of deionized water to the reaction test tube, connect it to the gas cylinder, plug the rubber stopper, light, nitrogen, the flow rate is 0.1 L / min, and draw 3 mL every 1 h The reaction solution was centrifuged to obtain a supernatant for later use. Take 1mL supernatant and mix it with 1mL Nessler's Reagent, put it into a spectrophotometer to measure the absorbance, take NH 4+ The absorbance value record at the 420nm place of the absorbance maximum position, and then compare with the absorbance of the ammonia nitrogen standard solution, finally obtain the concentration of ammonia nitrogen in the reaction solution, by image 3 It can be seen that the nitr...

Embodiment 3

[0059] First, weigh 200 mg of the prepared LTO and heat-treat it at 600 degrees for 6 hours under an argon-hydrogen atmosphere (5% hydrogen + 95% argon) to prepare an LTO sample containing oxygen vacancies, with a gas flow rate of 0.2 L / min;

[0060] Then weigh 30 mg of the LTO sample before and after heat treatment, add 30 mL of deionized water to the reaction test tube, connect it to the gas cylinder, plug the rubber stopper, light, nitrogen, the flow rate is 0.1 L / min, and draw 3 mL every 1 h The reaction solution was centrifuged to obtain the supernatant for later use; take 1mL of the supernatant and mix it with 1mL of the prepared Nessler's Reagent (Nessler's Reagent), put it into a spectrophotometer to measure the absorbance, and take NH 4+ The absorbance value record at the 420nm place of the absorbance maximum position, and then compare with the absorbance of the ammonia nitrogen standard solution, finally obtain the concentration of ammonia nitrogen in the reaction sol...

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Abstract

The invention provides an application method of lanthanum titanate nano-sheet to photocatalysis nitrogen fixation, which comprises the following steps: step 1, preparation of La2Ti2O7 namely LTO nano-sheet; 2, adjusting oxygen vacancies in that LTO nano-sheet; 3, carrying out a typical test process. Through the above steps, the invention successfully synthesizes LTO nano-sheets containing oxygen vacancies, and applies the LTO nano-sheets to photocatalytic nitrogen fixation. Compared with the original LTO nanosheets, the LTO nanosheets containing oxygen vacancies have the characteristics of non-toxicity, non-pollution, stable performance and no need to add organic matter as sacrificial agent in the nitrogen fixation process; the photocatalytic nitrogen fixation performance has been significantly improved, and the conversion efficiency from solar energy to chemical energy has been greatly improved.

Description

Technical field: [0001] The invention relates to an application method of lanthanum titanate nanosheets in photocatalytic nitrogen fixation, and belongs to the technical field of application of inorganic nanometer materials. Under the irradiation of sunlight, lanthanum titanate nanosheets can convert nitrogen in the air into ammonia or ammonium ions, and finally be used in the chemical industry, especially as agricultural fertilizers in agricultural production. Background technique: [0002] Nitrogen fixation refers to the nitrogen in the air (N 2 ) into a technology for synthesizing nitrogen through chemical, physical, biological and other means. Synthetic nitrogen can be expressed as nitric oxide (NO), nitrogen dioxide (NO 2 ), nitrate (NO 3 - ), ammonia (NH 3 ) and other forms. These synthetic nitrogen can provide nitrogen for the chemical fertilizers required for agricultural production, which is an important necessity for agricultural production. Traditional nitr...

Claims

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Application Information

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IPC IPC(8): C01G23/00C05G3/00B01J23/10
CPCC01G23/003C05G3/00B01J23/002B01J23/10C01P2002/72C01P2002/85B01J35/39
Inventor 张俊英毛梁马彦宁蔡晓燕李洋
Owner 北京利特沃环境科技有限公司
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