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Two-dimensional ultra-thin ZnO/BiOBr0.9I0.1 hybrid photocatalyst and preparation method thereof

A catalyst, ultra-thin technology, applied in the field of photocatalysis, to achieve good outdoor solar photocatalytic performance, simple preparation, simple production process and environmental protection effect

Active Publication Date: 2017-07-07
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies are based on the BiOBr x I 1-x Combining with substances with excellent conductivity not only avoids the photocorrosion of BiOBr but also promotes the transfer of photogenerated electrons so that the photogenerated electrons and holes can be effectively separated, and the photocatalytic activity has been further improved. Catalytic activity is still a long way off

Method used

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  • Two-dimensional ultra-thin ZnO/BiOBr0.9I0.1 hybrid photocatalyst and preparation method thereof
  • Two-dimensional ultra-thin ZnO/BiOBr0.9I0.1 hybrid photocatalyst and preparation method thereof
  • Two-dimensional ultra-thin ZnO/BiOBr0.9I0.1 hybrid photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Two-dimensional ultrathin ZnO / BiOBr with 20% ZnO mass percent 0.9 I 0.1 The preparation method of hybrid photocatalyst, the steps are as follows:

[0033] A two-dimensional ultra-thin Zn 5 (CO 3 ) 2 (OH) 6 Sheet preparation

[0034] (1) At room temperature, take by weighing 0.2469g of zinc acetate dihydrate, 0.0474g of CTAB, and 0.2704g of urea and dissolve them in 75ml of deionized water successively, and magnetic stirring makes it fully dissolve to obtain a zinc acetate concentration of 1.50×10 -2 Mixed solution of M.

[0035] (2) Transfer the above mixed solution into the inner lining of a 100ml autoclave, seal it, place it in a blast drying oven and heat it to a constant temperature of 80°C for 4 hours, then raise it to 120°C for 3 hours for hydrothermal reaction to obtain a two-dimensional Ultra-thin Zn 5 (CO 3 ) 2 (OH) 6 lamellae.

[0036] Precursor Zn 5 (CO 3 ) 2 (OH) 6 The X-ray diffraction (XRD) pattern of figure 1 As shown, it shows a bottom-c...

Embodiment 2

[0045] 2D Ultrathin ZnO / BiOBr with 10% ZnO Mass Percentage 0.9 I 0.1 The preparation method of hybrid photocatalyst, the steps are as follows:

[0046] A two-dimensional ultra-thin Zn 5 (CO 3 ) 2 (OH) 6 Sheet preparation

[0047] Operation process is with embodiment 1.

[0048] B two-dimensional ultra-thin 10w% ZnO / BiOBr 0.9 I 0.1 Preparation of hybrid photocatalyst

[0049] (1) At room temperature, the whole washed Zn 5 (CO 3 ) 2 (OH) 6 The ultra-thin layer was dispersed into 100ml of deionized water by ultrasound, and then 1.263g of NaBr and 0.183g of KI were added, dissolved under magnetic stirring and electrostatically adsorbed to them.

[0050] (2) Under magnetic stirring, 187.1 ml of bismuth nitrate ethylene glycol solution (7.0 g / L) was added dropwise to the system in step (1).

[0051] Immediately following the steps in Example 1, ZnO / BiOBr with a mass fraction of ZnO of 10% can be obtained 0.9 I 0.1 Hybrid composite (abbreviated 10ZB).

[0052] The XR...

Embodiment 3

[0054] Two-dimensional ultrathin ZnO / BiOBr with 40% ZnO mass percent 0.9 I 0.1 The preparation method of hybrid photocatalyst, the steps are as follows:

[0055] A two-dimensional ultra-thin Zn 5 (CO 3 ) 2 (OH) 6 Sheet preparation

[0056] Operation process is with embodiment 1.

[0057] B two-dimensional ultra-thin 40w% ZnO / BiOBr 0.9 I 0.1 Preparation of hybrid photocatalyst

[0058] (1) At room temperature, the entire washed precursor [Zn 5 (CO 3 ) 2 (OH) 6 ] The ultra-thin layer was dispersed into 100ml of deionized water by ultrasound, and then 0.210g of NaBr and 0.031g of KI were added, dissolved under magnetic stirring and electrostatically adsorbed with the precursor.

[0059] (2) Under magnetic stirring, 31.2 ml of bismuth nitrate ethylene glycol solution (7.0 g / L) was added dropwise to the system in step (1).

[0060] Immediately following the steps in Example 1, ZnO / BiOBr with a mass fraction of ZnO of 40% can be obtained 0.9 I 0.1 Hybrid composite (a...

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Abstract

The invention relates to the field of photocatalysis, in particular to a two-dimensional ZnO / BiOBr0.9I0.1 hybrid photocatalyst and a preparation method thereof. The photocatalyst is formed by carrying out two-phase hybridization and prepared from the following chemical components: ZnO / BiOBr0.9I0.1, wherein 0.9 and 0.1 respectively indicate stoichiometric mole fractions of halogens Br and I, and the mass percentage of ZnO is 10-50%. The preparation method of photocatalyst comprises the following characteristic steps: (1) preparing a two-dimensional ultra-thin Zn5(CO3)2(OH)6 sheet layer; and (2) preparing the two-dimensional ultra-thin ZnO / BiOBr0.9I0.1 hybrid photocatalyst. According to the two-dimensional ultra-thin ZnO / BiOBr0.9I0.1 hybrid photocatalyst provided by the invention, organic dyes can be degraded, and toxic organic phenol with a relatively stable structure also can be degraded. The preparation method is easy and environment-friendly, and has a potential application value in a solar photocatalytic decomposition treatment technology of organic pollutants.

Description

technical field [0001] The invention relates to the field of photocatalysis, specifically a two-dimensional ZnO / BiOBr 0.9 I 0.1 Hybrid solar catalyst and its preparation method. Background technique [0002] At present, how to effectively purify pollutants in the environment, especially toxic and refractory organic pollutants (such as phenols, pesticides, dyes, etc.), is one of the important issues facing human survival and health. As a new green environmental treatment technology that uses solar energy to degrade organic environmental pollutants, semiconductor photocatalysis technology has been widely studied in energy conversion and environmental restoration applications. Traditional semiconductor photocatalysts such as TiO 2 And ZnO has good photoinducibility, high salinity, and has been initially applied to the degradation of various pollutants in water bodies. However, they have a wide band gap and can only absorb a very small part (about 4%) of ultraviolet light in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138
CPCB01J27/138B01J35/39
Inventor 童艳花郎文静郑楚黄瑜杰
Owner HUZHOU TEACHERS COLLEGE
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