Method for preparing wheat-ear-shaped nano ZnO photocatalyst

A photocatalyst, wheat ear-shaped technology, applied in the field of preparing nano-ZnO photocatalyst, can solve the problems of insignificant photocatalytic degradation of organic pollutants, no catalytic degradation function, etc., and achieves simple process, short time and low reaction temperature. Effect

Active Publication Date: 2014-02-19
HEBEI NORMAL UNIV
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Problems solved by technology

In the past, various methods have been used to successfully synthesize nano-ZnO with different morphologies. However, there are still some limitations in the effective control of its photoc

Method used

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  • Method for preparing wheat-ear-shaped nano ZnO photocatalyst

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Embodiment 1

[0015] Add Zn(Ac) with a concentration of 1.0mol / L to the reactor 2 Solution 20ml, control the temperature of the reactor at 5℃ through low-temperature circulating water, add 30ml of 4.0mol / L NaOH solution under magnetic stirring to make the zinc-alkali molar ratio [Zn 2+ ]:[OH - ]=1:6, Zn(OH) containing precursor can be obtained 4 2- Ion solution, add distilled water to a constant volume, the total volume of the reaction solution is 100ml, and then age at a constant temperature of 85°C for 2h. The product is filtered, washed several times and then washed with dilute ammonia water, and dried to obtain wheat ear-like nano-ZnO particles. The "wheat ear" has a length of 5.8μm and a cross-sectional width of 0.96μm. The product morphology analysis is attached figure 1 .

Embodiment 2

[0017] Add Zn(Ac) with a concentration of 1.0mol / L to the reactor 2 Solution 20ml, control the temperature of the reactor at 5℃ through low-temperature circulating water, add 35ml of 4.0mol / L NaOH solution under magnetic stirring to make the zinc-alkali molar ratio [Zn 2+ ]:[OH - ]=1:7, can get precursor Zn(OH) 4 2- Ion solution, add distilled water to a constant volume, the total volume of the reaction solution is 100ml, and then age at 85°C for 3h. The product is filtered, washed with water several times and then washed with dilute ammonia water, and dried to obtain wheat ear-like nano-ZnO particles. The "wheat ear" has a length of 5.6μm and a cross-sectional width of 1.5μm.

Embodiment 3

[0019] Add Zn(Ac) with a concentration of 1.0mol / L to the reactor 2 Solution 20ml, control the temperature of the reactor at 5℃ through low-temperature circulating water, add 30ml of 4.0mol / L NaOH solution under magnetic stirring to make the zinc-alkali molar ratio [Zn 2+ ]:[OH - ]=1:6, Zn(OH) containing precursor can be obtained 4 2- Ion solution, add distilled water to a constant volume, the total volume of the reaction solution is 100ml, and then age at 65°C for 3h. The product is filtered, washed with water several times and then washed with dilute ammonia water. After drying, the wheat ear-like nano-ZnO particles can be obtained. The "wheat ear" has a length of 7.7μm and a cross-sectional width of 1.5μm.

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Abstract

The invention discloses a method for rapid liquid-phase synthesis of a nano ZnO photocatalyst in a wheat ear shape. A zinc acetate solution is used as a raw material, a sodium hydroxide solution is added at the temperature of 2-8 DEG C, the molar ratio of zinc to alkali in the mixed solution is controlled to be in a range of (1:5)-(1:7), a solution containing Zn(OH)4<2-> ion precursors is obtained and subjected to constant-temperature aging for 2-3 h in a water bath of 65-90 DEG C, obtained products are filtered, washed by water, washed by weak aqua ammonia and dried, and a wheat-ear-shaped nano ZnO powder material which is controllable in shape and good in crystallinity is obtained. The powder material has the excellent photocatalyst performance, and the degradation rate of organic pollutants such as methyl orange, methylene blue and the like can exceed 95%. The method has the advantages of availability of raw materials, simple technology, short reaction time, mild condition, freedom from pollutant emission and the like, and a new practicable and environment-friendly path is provided for industrial production of ultrafine ZnO powder.

Description

Technical field [0001] The invention relates to a method for preparing nano ZnO photocatalyst, in particular to a method for liquid phase synthesis of wheat ear-shaped nano ZnO photocatalyst. Background technique [0002] Nano-ZnO can undergo a photocatalytic reaction under ultraviolet light excitation conditions, thereby catalyzing the oxidation and degradation of toxic organic pollutants in wastewater, and plays an extremely important role in environmental pollution control. As the new material industry has higher and higher requirements for powder performance, the catalytic performance of nano-ZnO largely depends on the physical structure and morphology of the product. Therefore, the research and development of nano-ZnO photocatalyst with controllable morphology has become a hot spot in the field of materials. SC Tsang et al. used zinc acetate and oleic acid as raw materials, and trioctylamine as the solvent, and hydrothermally reacted at 290°C for 1 hour to prepare rod-shape...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J35/02
Inventor 李平左江琴
Owner HEBEI NORMAL UNIV
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