Doped bismuth titanate niobate nanosheet and preparation method thereof

A technology of bismuth titanium niobate and nanosheets, applied in the field of photocatalysis, can solve the problems of narrow visible light utilization rate, low degradation efficiency, bandgap width, and photogenerated carrier separation efficiency to be further improved.

Pending Publication Date: 2021-12-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, on Bi 3 TiNbO 9 The degradation of pollutants under visible light has been reported, but there are still problems such as low degradation effici

Method used

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  • Doped bismuth titanate niobate nanosheet and preparation method thereof
  • Doped bismuth titanate niobate nanosheet and preparation method thereof
  • Doped bismuth titanate niobate nanosheet and preparation method thereof

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preparation example Construction

[0029] A doped Bi 3 TiNbO 9 The preparation method of nano sheet, comprises the following steps:

[0030] Step 1: According to the chemical formula Bi 3 Ti 1-x Fe x NbO 9 Analytical pure Bi 2 o 3 、TiO 2 , Nb 2 o 5 , Fe 2 o 3 , NaCl and KCl mixed with zirconium ball stone and absolute ethanol, ball milled and dried to form a dry material, the ball milling time is 4 hours, NaCl and KCl and Bi 3 Ti 1-x Fe x NbO 9 The ratio is molar ratio = 50:50:1, and then the dry material is roasted in a muffle furnace. The roasting conditions are: the temperature is raised to 800 °C at 5 °C / min, and the holding time is 2 hours. After that, the temperature is increased at 5 °C / min Cool down to 500°C, and cool down to room temperature with the furnace to obtain a blocky solid;

[0031] Step 2: Put the massive solid in deionized water at 60°C for stirring and washing, change the water every 1 hour, wash until there is no white precipitate in the supernatant liquid detected by silv...

Embodiment 1

[0040] The doped titanium bismuth niobate nanosheets, the chemical formula is Bi 3 Ti 1-x Fe x NbO 9 , wherein x=0.01, wherein x represents the mole percentage.

[0041] Preparation of Bi by one-step molten salt method 3 Ti 1-x Fe x NbO 9 , where x=0.01, including the following steps:

[0042] Step 1: According to the chemical formula Bi 3 Ti 1-x Fe x NbO 9 (x=0.01), the 1.3978g Bi 2 o 3 , 0.1581g TiO 2 , 0.0016g Fe 2 o 3 , 0.2658g Nb 2 o 5 , 5.844g NaCl, 7.455g KCl, and 25mL of absolute ethanol were mixed uniformly by mechanical ball milling for 4 hours, and then the dried powder was roasted in a muffle furnace, and the temperature was raised to 800°C at 5°C / min, and the holding time was 2 hours. After that, cool down to 500°C at 5°C / min, and cool down to room temperature with the furnace;

[0043] Step 2: Place the blocky solid in deionized water at 60°C for stirring and washing, change the water every 1 hour, wash until the supernatant is detected with si...

Embodiment 2

[0045] The doped Bi 3 TiNbO 9 Nanosheets, the chemical formula is Bi 3 Ti 1-x Fe x NbO 9 , wherein x=0.03, wherein x represents the mole percentage.

[0046] Preparation of Bi by one-step molten salt method 3 Ti 1-x Fe x NbO 9 , where x=0.03, including the following steps:

[0047] Step 1: According to the chemical formula Bi 3 Ti 1-x Fe x NbO 9 (x=0.03), the 1.3978g Bi 2 o 3 , 0.1549g TiO 2 , 0.0048g Fe 2 o 3 , 0.2658g Nb 2 o 5 , 5.844g NaCl, 7.455g KCl, and 25mL of absolute ethanol were mixed uniformly by mechanical ball milling for 4 hours, and then the dried powder was roasted in a muffle furnace, and the temperature was raised to 800°C at 5°C / min, and the holding time was 2 hours. After that, cool down to 500°C at 5°C / min, and cool down to room temperature with the furnace;

[0048] Step 2: Place the blocky solid in deionized water at 60°C for stirring and washing, change the water every 1 hour, wash until the supernatant is detected with silver nitra...

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Abstract

The preparation method comprises the following steps: firstly, uniformly mixing analytically pure Bi2O3, TiO2, Nb2O5 and Fe2O3 with a certain proportion of salt through ball milling according to a chemical formula Bi3Ti<1-x>FexNbO9; secondly, roasting powder obtained by drying in a muffle furnace to obtain a blocky solid; thirdly, washing the blocky solid; and finally, carrying out drying to obtain the Fe-doped Bi3TiNbO9 nanosheet. The preparation method is simple in preparation process, low in reaction temperature, short in reaction time, low in material cost and suitable for industrial production, and the Bi3Ti<1-x>FexNbO9 photocatalyst obtained through the method is wide in visible light response range, high in photon-generated carrier separation efficiency and excellent in dye photocatalytic degradation performance.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a doped titanium bismuth niobate nanosheet and a preparation method thereof. Background technique [0002] Energy shortage and environmental pollution are two major problems facing the world today, which seriously violate the concept of sustainable development of mankind. With the development of science and technology, semiconductor photocatalysis technology has attracted the attention of scientific researchers because of its low cost and no secondary pollution in the process of pollutant treatment. Therefore, the use of semiconductor photocatalysis technology for solar renewable energy utilization, environmental protection, and green energy production has become the main field of inorganic materials research. The internal spontaneous polarization field of ferroelectric materials has been proved to be able to effectively drive the separation of photogenerated charges, inhibit the r...

Claims

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Application Information

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IPC IPC(8): B01J23/847C02F1/30C02F101/30C02F101/38
CPCB01J35/004B01J23/8474C02F1/30C02F2305/10C02F2101/38C02F2101/40C02F2101/308
Inventor 崔永飞郭鹏党培培孙欢欢
Owner SHAANXI UNIV OF SCI & TECH
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