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Method for synthesizing novel Ca-Bi-O visible light catalyst by adopting soft chemistry-hydrothermal technology

A photocatalyst, ca-bi-o technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. High visible light catalytic activity

Inactive Publication Date: 2010-07-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the existing new photocatalyst preparation technology, the purpose is to provide a new visible light active Ca-Bi-O photocatalyst synthesis method with low preparation temperature, simple application process, large specific surface area and high visible light activity.

Method used

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  • Method for synthesizing novel Ca-Bi-O visible light catalyst by adopting soft chemistry-hydrothermal technology
  • Method for synthesizing novel Ca-Bi-O visible light catalyst by adopting soft chemistry-hydrothermal technology
  • Method for synthesizing novel Ca-Bi-O visible light catalyst by adopting soft chemistry-hydrothermal technology

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Experimental program
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Effect test

Embodiment 1

[0015] Weigh a certain amount of Ca(NO 3 ) 2 4H 2 O and Bi(NO 3 ) 3 ·5H 2 O, Ca(NO 3 ) 2 4H 2 O was dissolved in 50ml deionized water to make a transparent solution, and then Bi(NO 3 ) 3 ·5H 2 O was dissolved in 50ml of dilute nitric acid solution just prepared, put the above two transparent solutions into a 200ml beaker and mix, and stirred for 30min to make it evenly mixed. Take a 500ml beaker, add 100ml deionized water as the bottom solution, mix the solution with 3mol / L ammonia water (NH 3 ·H 2 O) The two solutions are titrated together in the bottom solution, while stirring continuously to mix the precipitation reactants evenly, so that the pH of the reaction solution is kept at about 6, and the precipitation suspension obtained after the titration is completed is continued to stir and age for 30 minutes. Then use a centrifuge to separate the solid from the liquid, and wash the resulting white precipitate with deionized water to remove NH 4 + and NO 3 - , ...

Embodiment 2

[0017] Weigh a certain amount of Ca(NO 3 ) 2 4H 2 O and Bi(NO 3 ) 3 ·5H 2 O, Ca(NO 3 ) 2 4H 2 O was dissolved in 50ml deionized water to make a transparent solution, and then Bi(NO 3 ) 3 ·5H 2 O was dissolved in 50ml of dilute nitric acid solution just prepared, put the above two transparent solutions into a 200ml beaker and mix, and stirred for 30min to make it evenly mixed. Take a 500ml beaker, add 100ml deionized water as the bottom solution, mix the solution with 3mol / L ammonia water (NH 3 ·H 2 O) The two solutions are titrated together in the bottom solution, while stirring continuously to mix the precipitation reactants evenly, so that the pH of the reaction solution is kept at about 7, and the precipitation suspension obtained after the titration is completed is continued to stir and age for 30 minutes. Then use a centrifuge to separate the solid from the liquid, and wash the resulting white precipitate with deionized water to remove NH 4 + and NO 3 - , ...

Embodiment 3

[0019] Weigh a certain amount of Ca(NO 3 ) 2 4H 2 O and Bi(NO 3 ) 3 ·5H 2 O, Ca(NO 3 ) 2 4H 2 O was dissolved in 50ml deionized water to make a transparent solution, and then Bi(NO 3 ) 3 ·5H 2 O was dissolved in 50ml of dilute nitric acid solution just prepared, put the above two transparent solutions into a 200ml beaker and mix, and stirred for 30min to make it evenly mixed. Take a 500ml beaker, add 100ml deionized water as the bottom solution, mix the solution with 3mol / L ammonia water (NH 3 ·H 2 O) The two solutions are titrated together in the bottom solution, while stirring continuously to mix the precipitation reactants evenly, so that the pH of the reaction solution is kept at about 7, and the precipitation suspension obtained after the titration is completed is continued to stir and age for 30 minutes. Then use a centrifuge to separate the solid from the liquid, and wash the resulting white precipitate with deionized water to remove NH 4 + and NO 3 - , ...

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Abstract

The invention discloses a method for synthesizing a novel visible light active Ca-Bi-O light catalyst by adopting the soft chemistry-hydrothermal technology, which has the characteristics that the preparation temperature is low, the application process is simple, and the obtained light catalyst has big specific surface area and high visible light activity and contains Ca-Bi-O compound taking the monoclinic CaBi2O4 as the main body. Transparent solution with a certain concentration is prepared respectively by Ca(NO3)2 and Bi(NO3)3, the Ca(NO3)2 solution and the Bi(NO3)3 solution are mixed uniformly, and dilute ammonia water and the mixed solution are simultaneously dipped into de-ionized water for mixing and keeping a certain pH value, so as to obtain white suspension. The generated suspension is centrifugally separated and diluted into while precipitate suspension, and the while precipitate suspension is placed into a closed kettle made of stainless steel material and lined with white polytetrafluoroethylene for heat treatment, wherein the temperature is 160-240 DEG C, the processing time is 2-10h, and then, after the processing, the Ca-Bi-O light catalyst can be obtained by cooling and drying.

Description

technical field [0001] The present invention relates to a kind of preparation method of novel photocatalyst, relate to a kind of adopting soft chemical-hydrothermal technique to synthesize 2 o 4 The invention relates to a novel visible-light active Ca-Bi-O photocatalyst method, which belongs to the scientific and technical field intersecting material science and catalysis science. Background technique [0002] The most widely used photocatalysts such as TiO 2 etc., are wide-bandgap semiconductor photocatalysts that respond only in the ultraviolet range. Therefore, the development of highly active photocatalysts that respond to visible light is the key to improving the utilization rate of solar energy and realizing the industrialization of photocatalytic technology. By adjusting the energy band structure of semiconductor photocatalysts, people have designed many new photocatalysts, the Ca-Bi-O series compound CaBi 2 o 4 As one of the promising new photocatalytic material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J23/02
Inventor 戈磊张宪华
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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