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Visible-light-induced photocatalyst bismuth tungstate nano-chip and preparation method thereof

A photocatalyst and nano-chip technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low product purity, difficult control of grain size, high reaction temperature, etc., and achieve preparation The effect of simple process equipment, mild reaction conditions and high purity

Active Publication Date: 2016-05-25
TIANJIN RES INST FOR ADVANCED EQUIP TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is a nano-bismuth tungstate material, which is mainly prepared by using bismuth oxide and tungsten oxide for solid-state reaction, or using bismuth nitrate and sodium tungstate as raw materials by co-precipitation method, sol-gel method or hydrothermal method; ubiquitous products Disadvantages such as low purity, high reaction temperature or difficulty in controlling grain size

Method used

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  • Visible-light-induced photocatalyst bismuth tungstate nano-chip and preparation method thereof
  • Visible-light-induced photocatalyst bismuth tungstate nano-chip and preparation method thereof
  • Visible-light-induced photocatalyst bismuth tungstate nano-chip and preparation method thereof

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Embodiment 1

[0028] A preparation method of a visible light photocatalyst bismuth tungstate nanochip, comprising the following steps:

[0029] 1) Dissolve 10mmol of bismuth nitrate and 30mmol of glycerin in 200ml of isopropanol, stir evenly to obtain a clear liquid, transfer this solution to an autoclave with a volume of 250ml, heat up to 160°C and keep it warm for 6 hours; wait for the reaction kettle to cool to room temperature, filter and wash the filter cake with isopropanol for 3 times, then dry the filter cake at 80°C for 12 hours to obtain bismuth glycerol powder;

[0030] 2) Dissolve 10mmol of sodium tungstate in 100ml of deionized water to prepare a uniform sodium tungstate aqueous solution, then add 9mmol of bismuth glycerol to it, stir vigorously to disperse the bismuth glycerol evenly, and adjust the pH value of the resulting solution system to 0- 1, and then the resulting mixture was transferred to a volume of 200ml autoclave, heated to 180 ° C for 12 hours of heat preservatio...

Embodiment 2

[0033] A preparation method of a visible light photocatalyst bismuth tungstate nanochip, comprising the following steps:

[0034] 1) Dissolve 10mol of bismuth nitrate and 15mol of glycerin in 100L of isopropanol, stir evenly to obtain a clear liquid, transfer this solution to an autoclave with a volume of 200L, heat up to 160°C and keep it warm for 12 hours; wait for the reaction kettle to cool to room temperature, filter and wash the filter cake with isopropanol for 3 times, then dry the filter cake at 80°C for 12 hours to obtain bismuth glycerol powder;

[0035] 2) Dissolve 10 mol of sodium tungstate in 20L of deionized water to prepare a uniform sodium tungstate aqueous solution, then add 10 mol of bismuth glycerol to it, stir vigorously to disperse the bismuth glycerol evenly, and adjust the pH value of the obtained solution system to 0- 1, then the resulting mixture was transferred to an autoclave with a volume of 20 L, and the temperature was raised to 180° C. for 24 hou...

Embodiment 3

[0038] A preparation method of a visible light photocatalyst bismuth tungstate nanochip, comprising the following steps:

[0039] 1) Dissolve 100mmol of bismuth nitrate and 200mmol of glycerin in 2.5L of isopropanol, stir evenly to obtain a clear liquid, transfer this solution to an autoclave with a volume of 4L, raise the temperature to 160°C and keep it warm for 3 hours; Cool to room temperature, filter and wash the filter cake 3 times with isopropanol, then dry the filter cake at 80°C for 12 hours to obtain bismuth glycerol powder;

[0040] 2) Dissolve 100mmol of sodium tungstate in 100ml of deionized water to prepare a uniform sodium tungstate aqueous solution, then add 110mmol of bismuth glycerol to it, stir vigorously to disperse the bismuth glycerol evenly, and adjust the pH value of the resulting solution system to 1- 2, the resulting mixture was transferred to an autoclave with a volume of 200 ml, and the temperature was raised to 180° C. for 4 hours of reaction. Aft...

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Abstract

The invention discloses a visible-light-induced photocatalyst bismuth tungstate nano-chip. A preparation method of this chip comprises the following steps: 1), subjecting bismuth nitrate and glycerol to solvothermal reaction in isopropyl alcohol solvent, and filtering, washing and drying to obtain bismuth glycerol; 2), dispersing the bismuth glycerol evenly in sodium tungstate solution, adjusting PH of an obtained solution system to 0-2, carrying out hydrothermal reaction, and filtering, washing and drying to obtain nano bismuth tungstate. The bismuth nitrate, the glycerol and the sodium tungstate are used as main materials, bismuth tungstate nano-chip powder is prepared by using a two-step method, related preparation equipment is simple, reaction conditions are mild, energy consumption is low, the technique is unique and novel, obtained finished sodium bismuth molybdate has grain size of 20-40 nm and may be directly used as a photocatalyst for degrading organic pollutants by photocatalysis in visible light.

Description

technical field [0001] The invention belongs to the field of new environmental protection materials, and in particular relates to a visible light photocatalyst nano-bismuth tungstate and a preparation method thereof. Background technique [0002] Photocatalytic reactions can degrade almost all organic pollutants, such as alkanes, halogenated alkanes, alcohols, carboxylic acids, alkenes, aromatic hydrocarbons, halogenated aromatic compounds, polymers, pesticides, herbicides, dyes, and brominated flame retardants , disinfection by-products and other pollutants. Therefore, photocatalytic technology is considered to be an ideal new technology for environmental governance, and it is the most promising means of controlling environmental pollution, especially the treatment technology for visible light photocatalytic degradation of pollutants, which uses natural sunlight and does not require additional energy consumption. Traditional TiO 2 Photocatalysts mainly absorb ultraviolet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J37/10B82Y40/00C02F1/30
CPCB82Y40/00C02F1/30B01J23/31B01J37/10C02F2101/308C02F2305/10B01J35/39
Inventor 林志东李俊锋洪玉元付萍王学华
Owner TIANJIN RES INST FOR ADVANCED EQUIP TSINGHUA UNIV
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