Hydrothermal method for preparing Bi-doped ZnWO4 photocatalyst

A technology of photocatalyst and hydrothermal method, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. It can solve the problem of low utilization rate of visible light energy and achieve improved Photocatalytic performance, simplification of experimental conditions, effects of ensuring uniformity and dispersion

Inactive Publication Date: 2014-06-11
HUZHOU TEACHERS COLLEGE
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Problems solved by technology

[0004] But since ZnWO 4 The energy gap of ZnWO is relatively large, and the light absorption wavelength range is mainly in the ultraviolet region (254nm). The recombination rate of photogenerated electrons and holes is relatively high, so the energy utilization rate of visible light is low. 4 The photocatalytic performance should expand the spectral response range

Method used

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  • Hydrothermal method for preparing Bi-doped ZnWO4 photocatalyst
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  • Hydrothermal method for preparing Bi-doped ZnWO4 photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] First, take 1 mmol of sodium tungstate dihydrate and zinc nitrate hexahydrate, add a certain amount of deionized water, and stir at room temperature. Adjust the pH value of the mixed solution to 8 with sodium hydroxide solution. Put it at room temperature and add 0.01% polyacrylamide (PAM, number average molecular weight 2.13×10 7 ), while magnetically stirring for 30 minutes, transfer to the reaction kettle, put the reaction kettle in the oven, keep it at 180°C for 48 hours, wait until it is cooled to room temperature, wash it with deionized water and absolute ethanol for 2-3 times, set Dry in the oven to get ZnWO 4 Powder, shown as needle-like by scanning electron microscope ( figure 1 ). Take bismuth nitrate pentahydrate and glucose (mass ratio 2:1) and dissolve them in ethylene glycol and water respectively to form A and B solutions. Mix the above AB solutions together, and then add a certain amount of needle-shaped ZnWO 4 Powder (based on bismuth nitrate pentahydra...

Embodiment 2

[0031] First, take 10 mmol of potassium tungstate and zinc sulfate heptahydrate, add a certain amount of deionized water, and stir at room temperature. Adjust the pH value of the mixed solution to 12 with potassium hydroxide solution. Put it at room temperature and add 0.05% polyacrylamide (PAM, number average molecular weight 2.13×10 7 ), while magnetically stirring for 120 minutes, transfer to the reactor, put the reactor into the oven, keep it at 150°C for 24 hours, after it cools to room temperature, wash it with deionized water and absolute ethanol for 2-3 times, oven Medium drying, get ZnWO 4 powder. As in Example 1, Suspension C was transferred to a reaction kettle at a reaction temperature of 150°C, and a reaction time of 24 hours. After cooling to room temperature, it was washed with ethanol and deionized water several times, and dried at 50°C for 24 hours to obtain needles. Bi-doped ZnWO 4 Photocatalyst such as Image 6 . The photocatalysis experiment was the same a...

Embodiment 3

[0033] First, take 5mmol of the total substance of the mixture of sodium tungstate dihydrate and potassium tungstate, and add a certain amount of deionization to the mixture composed of zinc nitrate hexahydrate, zinc sulfate heptahydrate, and zinc chloride. The total substance is 5mmol. Water, stir at room temperature. Adjust the pH value of the mixed solution to 10 with sodium hydroxide or potassium hydroxide solution. Put it at room temperature and add 0.03% polyacrylamide (PAM, number average molecular weight 2.13×10 7 ), while magnetically stirring for 100 minutes, transfer to the reactor, put the reactor into the oven, keep it at 160℃ for 36 hours, wait until it is cooled to room temperature, wash it with deionized water and absolute ethanol for 2-3 times, set Dry in the oven to get ZnWO 4 powder. As in Example 1, Suspension C was transferred to a reaction kettle at a reaction temperature of 140°C, and a reaction time of 20 hours. After cooling to room temperature, it was...

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Abstract

The invention belongs to the technical field of photocatalyst and particularly relates to a hydrothermal method for preparing a Bi-doped ZnWO4 photocatalyst. The hydrothermal method comprises the following detail steps: adding equimolecular 1-10mmol of soluble tungstate and soluble zinc salt with deionized water and stirring; adjusting the pH value of a mixed solution to 8-12, adding 0.01-0.05% by mass of polyacrylamide and simultaneously performing magnetic stirring; preserving heat for 24-48 hours at the temperature of 150-180 DEG C for hydrothermal reaction; cooling, washing, and drying to obtain needle-shaped ZnWO4 powder; respectively dissolving bismuth nitrate pentahydrate and glucose in ethylene glycol and water to obtain two solutions, mixing the two solutions, adding a certain amount of needle-shaped ZnWO4 powder, preserving heat for 15-24 hours at the temperature of 120-150 DEG C for hydrothermal reaction; cooling, washing, and drying to obtain the Bi-doped ZnWO4 photocatalyst. Two steps of hydrothermal processes are adopted, polyacrylamide serving as a template is doped with Bi, the reaction operation and process are simple and easy to control, and the needle-shaped catalyst has good uniformity and high photocatalytic activity.

Description

Technical field [0001] The invention belongs to the technical field of photocatalysts, and relates to a hydrothermal method for preparing Bi-doped ZnWO 4 Photocatalyst method. Background technique [0002] In recent years, metal tungstates such as Na 2 W 4 O 13 , Bi 2 W 2 O 9 , (NaBi) 0.5 WO 4 , AgInW 2 O 8 , Bi 2 WO 6 Research on other catalysts has also aroused people's interest. These tungstate materials have high photocatalytic effects in the degradation of organic pollutants. Among them, ZnWO 4 It has good stability, photocatalysis and photoluminescence. As a photocatalyst, it can be used to effectively degrade organic pollutants (formaldehyde, rhodamine B and malachite green) in air and water, which has caused scientific researchers s concern. [0003] Currently synthesized ZnWO 4 There are roughly two methods: solid phase method and liquid phase method. For example, Wang Qianping, in "A method for preparing ultrafine zinc tungstate antibacterial agent by ultrasonic molten ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J37/10
Inventor 陈海锋唐培松潘国祥曹枫王坤燕张玉建
Owner HUZHOU TEACHERS COLLEGE
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