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Novel high-efficiency strontium borate-like photocatalyst

A technology similar to boric acid and catalyst, applied in the field of photocatalysis to achieve high photocatalytic efficiency

Active Publication Date: 2013-07-17
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research work of strontium borate on photocatalytic reduction of carbon dioxide and water to methane has not been reported. The research results will open up a new direction for the design and preparation of high-efficiency photocatalysts and their applications in the field of energy and environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take a certain amount of Sr(NO 3 ) 2 Solid, use high-purity water as solvent, prepare 1mol / L Sr(NO 3 ) 2 solution. Get 85ml high-purity water, stir at room temperature, add successively 7.6856g citric acid (0.04mol) (analytical pure and 10ml Sr(NO 3 ) 2 solution, stirred for 5 minutes; 1.2366g boric acid (0.02mol) was added to the system, and stirred for 10 minutes to completely dissolve; 3.3ml of ethylene glycol (0.06mol) was added, and stirred for 10 minutes to completely dissolve; in a 90°C water bath Evaporate for 4 hours until it completely becomes a sol; dry the sol in an oven at 120° C. for 10 hours to form a gel; grind it into powder, and calcinate it in air at 500° C. for 4.5 hours to obtain a nano-strontium borate photocatalyst (sample A). Using the above evaluation method of photocatalytic efficiency, the amount of methane generated by photocatalysis for 10 hours is 2.44×10 -5 mol / L, while under the same conditions, TiO 2 (P25) The amount of methane pr...

Embodiment 2

[0018] The experimental conditions and steps are the same as in Example 1, and the calcination temperature is changed to 600° C., and the obtained nanoscale strontium borate photocatalyst (sample B) uses the above-mentioned photocatalytic activity evaluation method, and the amount of methane generated by photocatalysis for 10 hours is 5.63×10 -5 mol / L, is TiO 2 (P25) 2.33 times.

Embodiment 3

[0020] The experimental conditions and steps are the same as those in Example 1, and the calcination temperature is changed to 700°C to obtain a nano-strontium borate photocatalyst (sample C). Using the above-mentioned photocatalytic activity evaluation method, under ultraviolet light irradiation, the amount of methane produced by photocatalysis for 10 hours is 3.77×10 -5 mol / L, is TiO 2 (P25) 1.56 times.

[0021] The above examples show that the photocatalytic reduction of carbon dioxide and water to methane by the strontium borate photocatalyst has high photocatalytic efficiency.

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Abstract

The invention discloses a high-efficiency strontium borate-like photocatalyst and a preparation method thereof and aims to prepare methane by reducing carbon dioxide and water through photocatalysis technology. In the photocatalyst, strontium salt, a boron-containing compound, citric acid or citrate and alcohols are used as precursors. The photocatalysis efficiency of reducing the carbon dioxide and water to prepare the methane of the high-activity strontium borate-like photocatalyst prepared by a sol-gel method is superior to that of a TiO2 photocatalyst (P25, which is known as the photocatalyst with higher photocatalysis efficiency at present). The novel high-efficiency strontium borate-like photocatalyst has the advantages of simple preparation process, easy operation, low requirements on equipment and the like and has wide application prospect and development potential in the fields of emission reduction of carbon dioxide, recycling of energy, environmental science and the like.

Description

【Technical field】 [0001] The present invention has developed a high-efficiency strontium borate-like photocatalyst, and the photocatalytic reduction of carbon dioxide and water to prepare methane efficiency of the catalyst has surpassed that of TiO 2 (P25) Photocatalyst. The invention belongs to the technical field of photocatalysis and provides a high-efficiency photocatalyst for reducing carbon dioxide and water to produce methane by using the photocatalysis technology. 【Background technique】 [0002] The energy crisis and environmental degradation in today's world have prompted people to search for clean, renewable new energy sources and new methods of governing the environment. In recent years, research on photocatalytic materials has made great progress. In 1972, Fujishima and Honda used titanium dioxide (TiO 2 ) The experiment of hydrogen production by photolysis of water with single crystal electrode created the research field of semiconductor heterogeneous photoca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/02C07C9/04C07C1/10
Inventor 曹亚安杨晓丹
Owner NANKAI UNIV
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