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Method for stabilizing Bi2O2CO3 at high temperature

A stable, high-temperature technology, applied in the direction of chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., to achieve the effect of simple operation method, significant effect, and improvement of unstable phenomena

Inactive Publication Date: 2016-12-07
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, from the point of view of practical application, how to use a simpler method to make Bi 2 o 2 CO 3 Stable existence while maintaining its high photocatalytic performance is of great significance, but how to make Bi 2 o 2 CO 3 The research that can exist stably has not been reported so far

Method used

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  • Method for stabilizing Bi2O2CO3 at high temperature
  • Method for stabilizing Bi2O2CO3 at high temperature
  • Method for stabilizing Bi2O2CO3 at high temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A stable Bi at high temperature 2 o 2 CO 3 method, specifically including the following steps:

[0035] 1) Weigh the Bi(NO 3 ) 3 ·5H 2 O and Na 2 CO 3 (Na 2 CO 3 Relative to Bi(NO 3 ) 3 ·5H 2 O excess), the Bi(NO 3 ) 3 ·5H 2 O is dissolved in dilute nitric acid to form Bi(NO 3 ) 3 nitric acid solution, and Na 2 CO 3 Add water to dissolve to a concentration of 0.9mol / L Na 2 CO 3 Solution (Na 2 CO 3 The solution must be a concentrated solution, the concentration is greater than 0.7mol / L), and the Na 2 CO 3 The solution was heated in a constant temperature water bath at 60°C for 5 minutes;

[0036] 2) the above Bi(NO 3 ) 3 The nitric acid solution was slowly added dropwise to the heated Na 2 CO 3 solution, and reacted in a constant temperature water bath at 60°C for 3 hours, then cooled the reaction solution to room temperature, filtered, washed, and dried to obtain Bi 2 o 2 CO 3 Precursor samples;

[0037] 3) La(NO 3 ) 3 ·6H 2 O dissolve...

Embodiment 2

[0053] A stable Bi at high temperature 2 o 2 CO 3 The method, the specific steps refer to Example 1; the difference is only in step 4), the calcination temperature is 400 ° C. The sample prepared by this method is labeled as 3% La 2 o 3 / Bi 2 o 2 CO 3 -400°C. For comparison, Bi 2 o 2 CO 3 The sample after calcination at 400°C is marked as Bi 2 o 2 CO 3 -400°C. exist Figure 4 Middle Bi 2 o 2 CO 3 In the XRD spectrum of the sample at -400℃, in addition to the observation with β-Bi 2 o 3 In addition to the characteristic diffraction peaks consistent with the standard card JCPDF (#78-1793), higher intensity is observed at 2θ=25.8°, 26.9°, 27.4°, 33.0°, 33.3°, 35.0°, 46.3°, etc. Diffraction peaks, these diffraction peaks and α-Bi 2 o 3 The standard card JCPDF (#71-2274) has a good correspondence, this XRD result shows that Bi 2 o 2 CO 3 -400℃ sample is β-Bi 2 o 3 and α-Bi 2 o 3 mixed crystal phase, indicating that the β-Bi 2 o 3 →α-Bi 2 o 3 Crystal...

Embodiment 3

[0057] A stable Bi at high temperature 2 o 2 CO 3 method, specifically including the following steps:

[0058] 1) Weigh the Bi(NO 3 ) 3 ·5H 2 O and Na 2 CO 3 , the Bi(NO 3 ) 3 ·5H 2 O is dissolved in dilute nitric acid to form Bi(NO 3 ) 3 nitric acid solution, and Na 2 CO 3 Add water to dissolve to a concentration of 0.7mol / L Na 2 CO 3 solution, the Na 2 CO 3 The solution was heated in a constant temperature water bath at 50°C for 10 minutes;

[0059] 2) the above Bi(NO 3 ) 3 The nitric acid solution was slowly added dropwise to the heated Na 2 CO 3 solution, and reacted in a constant temperature water bath at 50°C for 4h, then cooled the reaction solution to room temperature, filtered, washed, and dried to obtain Bi 2 o 2 CO 3 Precursor samples;

[0060] 3) Set Y(NO 3 ) 3 ·6H 2 O dissolves in water to form Y(NO 3 ) 3 solution;

[0061] 4) Y(NO) prepared above 3 ) 3 The solution was used as a stabilizer, and Y(NO 3 ) 3 The solution was added ...

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Abstract

The invention provides a method for stabilizing Bi2O2CO3 at a high temperature. The method comprises the following steps of respectively dissolving Bi(NO3)3.5H2O and Na2CO3; performing 50-80 DEG C constant temperature water bath heating on the Na2CO3 solution; adding a Bi(NO3)3 nitric acid solution into the heated Na2CO3 solution; performing constant temperature water bath reaction for 2 to 12h; then, cooling the reaction liquid to room temperature; performing filtering, washing and drying to obtain Bi2O2CO3 precursors; dissolving X(NO3)3.6H2O; soaking the X(NO3)3.6H2O and the prepared Bi2O2CO3 precursors at the mass ratio of (1 to 5) to 100, wherein the soaking time is 12 to 24h; then, performing filtering and drying; performing roasting under the condition of 250 to 400 DEG C; obtaining Bi2O2CO3 photocatalysts with X2O3 dispersed on the surface, wherein the X is metal Y or La. The method provided by the invention has the advantages that the operation is simple; the preparation cost is low; by using a method of adding the stabilizing agent La(NO3)3 (or Y (NO3)3), the Bi2O2CO3 is stabilized to be at least 300 DEG C; the photocatalytic activity is higher.

Description

technical field [0001] The present invention provides a stable Bi 2 o 2 CO 3 , and maintain its high photocatalytic activity. Background technique [0002] Photocatalytic technology has important application prospects in solving energy and environmental problems, so it has received extensive attention. In the field of photocatalysis, due to TiO 2 It has excellent properties such as high photocatalytic activity, stable structure, low price, and non-toxicity, so it is called one of the most widely studied photocatalysts. But TiO 2 The electrons and holes generated during photoexcitation are very easy to recombine, making the photon quantum efficiency low. Therefore, the development of new photocatalytic semiconductors has become one of the main research tasks. [0003] At present, Bi-based composite photocatalytic semiconductors have good photocatalytic activity, and have gradually developed into a research hotspot in the field of photocatalysis. Bi 2 o 2 CO 3 is an...

Claims

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Application Information

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IPC IPC(8): C01G29/00B01J27/232
CPCB01J27/232C01G29/00C01P2002/72
Inventor 张静李帅刘果吴维成
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY