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Method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and application of catalyst

A junctional bismuth oxyfluoride, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, bismuth compounds, etc. The effect of high activity, good shape and simple method

Active Publication Date: 2015-10-28
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 It is one of the most common and most studied catalysts, but the photogenerated electron-hole pairs generated by it are easy to recombine, resulting in the inability of electrons and holes to migrate to the surface in time to participate in redox reactions, resulting in low photoconversion efficiency

Method used

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  • Method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and application of catalyst
  • Method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and application of catalyst
  • Method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the preparation of bowtie-shaped bismuth oxyfluoride photocatalyst

[0023] Add 0.45g of bismuth nitrate pentahydrate to 15mL of water, and stir for 20 minutes; then add 0.25g of ammonium fluoride while stirring, and continue stirring for 10 minutes to form a mixed solution; Thermal reaction, the hydrothermal reaction condition is 150°C for 12 hours; after the reaction, cool for 2 hours, and centrifuge at 3000r / min for 3 minutes to obtain a precipitate. The precipitate was washed twice by centrifugation with pure water (3000 rpm, 2 minutes each time), and then washed twice with absolute ethanol (3000 rpm, 2 minutes each time). minutes), dried at 60°C for 2 hours to obtain the bow-tie bismuth oxyfluoride photocatalyst Bi 7 f 11 o 5 .

[0024] figure 2 The X-ray diffraction (XRD) pattern of the bow-tie-shaped bismuth oxyfluoride photocatalyst prepared in Example 1, and the XRD standard card (JCPDS: 50-0003), illustrate that the bow-tie-shaped bismuth o...

Embodiment 2

[0025] Embodiment 2: preparation of bowtie-shaped bismuth oxyfluoride photocatalyst

[0026] Add 0.4g of bismuth nitrate pentahydrate to 15mL of water, and stir for 15 minutes; then add 0.2g of ammonium fluoride while stirring, and continue stirring for 5 minutes to form a mixed solution; Thermal reaction, the hydrothermal reaction condition is 140°C for 14 hours; after the reaction, cool for 2 hours, and centrifuge at 2500r / min for 4 minutes to obtain a precipitate. The precipitate was washed twice by centrifugation with pure water (3000 rpm, 2 minutes each time), and then washed twice with absolute ethanol (3000 rpm, 2 minutes each time). minutes), dried at 50°C for 3 hours to obtain the bow-tie bismuth oxyfluoride photocatalyst Bi 7 f 11 o 5 . The SEM and XRD patterns of the bowtie-shaped bismuth oxyfluoride photocatalyst prepared in Example 2 are consistent with those in Example 1.

Embodiment 3

[0027] Embodiment 3: the preparation of bowtie-shaped bismuth oxyfluoride photocatalyst

[0028] Add 0.5g of bismuth nitrate pentahydrate to 15mL of water, and stir for 25 minutes; then add 0.3g of ammonium fluoride while stirring, and continue stirring for 15 minutes to form a mixed solution; Thermal reaction, the hydrothermal reaction condition is 160°C for 10 hours; after the reaction, cool for 2 hours, and centrifuge at 3500r / min for 2 minutes to obtain a precipitate. The precipitate was washed twice by centrifugation with pure water (3000 rpm, 2 minutes each time), and then washed twice with absolute ethanol (3000 rpm, 2 minutes each time). minutes), dried at 70°C for 1 hour to obtain the bow-tie bismuth oxyfluoride photocatalyst Bi 7 f 11 o 5 . The SEM image and XRD image of the bowtie-shaped bismuth oxyfluoride photocatalyst prepared in Example 3 are consistent with Example 1.

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Abstract

The invention discloses a method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and an application of the catalyst. The method comprises the following steps that bismuth nitrate pentahydrate is added in water, the adding amount is 0.4g / 15mL to 0.5g / 15mL according to the volume of the water, stirring is conducted for 15 to 20 min, and stirring is conducted continuously for 5 to 15 min to form mixing solution; then the mixing solution is added into a linear made of teflon to conduct hydrothermal reaction; cooling is conducted after the reaction is finished, centrifugation is conducted, sediment is obtained, and the bowknot-shaped fluorine-oxygen-bismuth photocatalyst BI7F1105 is obtained by drying and washing. The method for preparing the bowknot-shaped fluorine-oxygen-bismuth photocatalyst has the advantages that the prepared bowknot-shaped fluorine-oxygen-bismuth photocatalyst can be existed stably, the form is good, the bowknot-like shape is not reported ever, and the ability of catalytic degradation on organic matters is higher than that of the normal TiO2 catalyst.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a method for preparing a bowtie-shaped bismuth oxyfluoride photocatalyst and the use of the catalyst. Background technique [0002] With the development of chemical industry, environmental pollution is becoming more and more serious. Utilizing the surface energy activation characteristics of semiconductor oxide materials under sunlight irradiation, organic pollutants can be effectively oxidized and decomposed. Compared with traditional environmental purification treatment methods, semiconductor photocatalysis technology has the advantages of mild reaction conditions, no secondary pollution, simple operation and significant degradation effect. TiO 2 It is one of the most common and most studied catalysts, but the photogenerated electron-hole pairs generated by it are easy to recombine, resulting in the inability of electrons and holes to migrate to the surface in time to part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/12C01G29/00C02F1/32C02F101/30
CPCY02W10/37
Inventor 滕飞邹思佳李敏俸晨凯刘再伦王淑蓉陈敏东
Owner NANJING UNIV OF INFORMATION SCI & TECH
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