Bismuth oxide and bismuth niobate composite material for removing algae in water as well as preparation method and application of bismuth oxide and bismuth niobate composite material

A composite material, bismuth oxide technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., to enhance photocatalytic activity, green environmental stability, and photocatalytic activity high effect

Active Publication Date: 2022-05-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But oxygen vacancies may serve as charge recombination centers, in which case, even though channels still exist, from photocatalyst to O 2 The number of electrons will also decrease, resulting in poorer O 2 activation

Method used

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  • Bismuth oxide and bismuth niobate composite material for removing algae in water as well as preparation method and application of bismuth oxide and bismuth niobate composite material
  • Bismuth oxide and bismuth niobate composite material for removing algae in water as well as preparation method and application of bismuth oxide and bismuth niobate composite material
  • Bismuth oxide and bismuth niobate composite material for removing algae in water as well as preparation method and application of bismuth oxide and bismuth niobate composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of Bi 3 NbO 7 The method is: slowly drop the first solution into the second solution, stir at room temperature 20-25°C for 30 minutes, then add benzyl alcohol, slowly add 2mol / L potassium hydroxide aqueous solution to adjust the pH to 13, transfer to 100ml with In a polytetrafluoroethylene-lined stainless steel high-pressure reaction kettle, keep warm at 180°C for 24h, cool naturally to room temperature, centrifuge, wash the centrifuged solids three times with deionized water and absolute ethanol, and store them in a drying oven at 80°C Dry for 8h to get Bi 3 NbO 7 , wherein, the preparation method of the first solution is to mix bismuth nitrate and glacial acetic acid, and stir at room temperature 20-25°C for 30 minutes; the preparation method of the second solution is to mix niobium oxalate and methanol, and stir at room temperature 20-25°C for 30 minutes; The ratio of the mass fraction of bismuth nitrate and the volume fraction of glacial acetic acid i...

Embodiment 2

[0038] Embodiment 2 (comparison)

[0039] BiO 2-x The preparation method of monomer comprises the following steps:

[0040] Mix sodium hydroxide, sodium bismuthate and water, stir at room temperature for 30 minutes until uniform, transfer to a 100ml stainless steel autoclave with polytetrafluoroethylene lining, keep warm at 180°C for 6 hours, naturally cool to room temperature, centrifuge, The solid obtained by washing and centrifuging with deionized water and absolute ethanol was 3 times each, dried in a drying oven at 80°C for 8 hours, and ground to obtain BiO 2-x Monomer, wherein, the ratio of the mass fraction of sodium hydroxide, the mass fraction of sodium bismuthate and the volume fraction of water is 2.4:2.8:60, the unit of mass fraction is g, and the unit of volume fraction is mL .

Embodiment 3～7

[0042] A bismuth oxide and bismuth niobate composite material (Bi 3 NbO 7 / BiO 2-x Composite material) preparation method, comprises the following steps:

[0043] Mix sodium hydroxide, sodium bismuthate and water, stir at room temperature for 30min until uniform, then add Bi obtained in Example 1 3 NbO 7 , stirred at room temperature for 20 minutes until uniform, transferred to a 100ml stainless steel autoclave lined with polytetrafluoroethylene, kept at 180°C for 6 hours, naturally cooled to room temperature, centrifuged, and washed with deionized water and absolute ethanol. The solids were dried 3 times in a drying oven at 80°C for 8 hours, and ground to obtain a bismuth oxide and bismuth niobate composite material, wherein the mass fraction of sodium hydroxide, the mass fraction of sodium bismuthate, and the volume fraction of water The ratio is 2.4:2.8:60, the unit of parts by mass is g, and the unit of parts by volume is mL. In terms of parts by mass, Bi 3 NbO 7 Th...

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Abstract

The invention discloses a bismuth oxide and bismuth niobate composite material for removing algae in a water body and a preparation method and application thereof.The preparation method comprises the following steps that sodium hydroxide, sodium bismuthate and water are mixed to be uniform, then Bi3NbO7 is added and stirred to be uniform, heat preservation is conducted for 5-8 h at the temperature of 170-180 DEG C, centrifugation is conducted, solids obtained through centrifugation are washed and dried, and the bismuth oxide and bismuth niobate composite material is obtained. The bismuth oxide and bismuth niobate composite material prepared by the invention can be used for removing harmful algae in a water body and has relatively good oxygen activation capability and visible light response capability, and in addition, due to the photon-generated carrier recombination rate of the bismuth oxide and bismuth niobate composite material, interlayer interface charge separation and transfer are accelerated, so that the bismuth oxide and bismuth niobate composite material has relatively high photocatalytic activity.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a bismuth oxide and bismuth niobate composite material for removing algae in water bodies, a preparation method and application thereof. Background technique [0002] With global warming, the problem of eutrophication in water bodies is becoming more and more serious, and the outbreak of harmful algal blooms poses a serious threat to aquatic ecosystems. In addition, most harmful algae, such as algal toxins produced by Microcystis aeruginosa, also pose a safety hazard to the water environment Hidden danger. The current methods of controlling harmful algal blooms mainly include physical methods, chemical methods and biological methods, such as mechanical salvage, ultrasonic crushing, and biological algae removal. However, the application of these traditional methods is limited due to the corresponding defects. For example, manual mechanical salvage requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C02F1/30
CPCB01J23/18B01J35/004C02F1/30C02F2305/10
Inventor 任芝军王鹏飞许冬雨张光明吕龙义刘晓阳高文芳
Owner HEBEI UNIV OF TECH
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