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Preparation method of potassium niobate/alpha-iron oxide heterogeneous photocatalyst

A technology of photocatalyst and iron oxide, which is applied in the field of photocatalysis, can solve the problems that the separation efficiency of photogenerated carriers needs to be further improved, cannot make full use of the visible light of the sun, and the band gap is large, so as to achieve the suppression of electron-hole recombination, time Short, separation-promoting effect

Active Publication Date: 2020-07-31
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its bandgap width is relatively large (~3.2eV), it can only absorb visible light, and cannot make full use of visible light in the solar spectrum, and the separation efficiency of photogenerated carriers inside it needs to be further improved.

Method used

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  • Preparation method of potassium niobate/alpha-iron oxide heterogeneous photocatalyst
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  • Preparation method of potassium niobate/alpha-iron oxide heterogeneous photocatalyst

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preparation example Construction

[0025] A kind of KNbO 3 / α-Fe 2 o 3 A method for preparing a heterogeneous photocatalyst, comprising the following steps:

[0026] Step 1: Preparation of KNbO 3: Dissolve 12.624g KOH in 15ml deionized water, then add 0.874g niobium powder, fully stir on a magnetic stirrer for 30min, then transfer to a 50ml polytetrafluoroethylene-lined reactor, and conduct a hydrothermal reaction at 150°C for 12h . The obtained product was fully washed with deionized water until the pH was neutral, and finally baked at 60°C for 12 hours to obtain KNbO 3 Powder;

[0027] Step two: the 0.2g KNbO obtained in step one 3 Powder added to FeCl 3 ·6H 2 O and Na 2 SO 4 25ml of aqueous solution, keep FeCl 3 ·6H 2 O and Na 2 SO 4 The molar ratio is 1:1, while adjusting the FeCl 3 ·6H 2 O and KNbO 3 The molar ratio is 0.4~10:1 to obtain a series of different α-Fe 2 o 3 Mass fraction of heterojunction photocatalyst; add 1.5ml glacial acetic acid to the solution, and stir for 30 minutes; ...

Embodiment 1

[0044] Preparation of KNbO by two-step hydrothermal method 3 / α-Fe 2 o 3 -x, wherein x=0.4, x is FeCl 3 ·6H 2 O and KNbO 3 The mol ratio, concrete steps are as follows:

[0045] Step 1: Preparation of KNbO 3 : Dissolve KOH in deionized water, then add niobium powder, fully stir on a magnetic stirrer, then transfer to a 50ml polytetrafluoroethylene-lined reactor, and conduct a hydrothermal reaction at 150°C for 12h. The obtained product was fully washed with deionized water until the pH was neutral, and finally baked at 60°C for 12 hours to obtain KNbO 3 Powder.

[0046] Step two: the 0.2g KNbO obtained in step one 3 Powder added to FeCl 3 ·6H 2 O and Na 2 SO 4 25ml of deionized water, keep the FeCl 3 ·6H 2 O and Na 2 SO 4 The molar ratio is 1:1, while adjusting the FeCl 3 ·6H 2 O and KNbO 3 The molar ratio of the solution is 0.4:1; add 1.5ml of glacial acetic acid to the solution, and stir for 30 minutes; after stirring evenly, add it to a 50ml polytetrafluo...

Embodiment 2

[0048] Preparation of KNbO by two-step hydrothermal method 3 / α-Fe 2 o 3 -x, where x=2, x is FeCl 3 ·6H 2 O and KNbO 3 The mol ratio, concrete steps are as follows:

[0049] Step 1: Preparation of KNbO 3 : Dissolve KOH in deionized water, then add niobium powder, fully stir on a magnetic stirrer, then transfer to a 50ml polytetrafluoroethylene-lined reactor, and conduct a hydrothermal reaction at 150°C for 12h. The obtained product was fully washed with deionized water until the pH was neutral, and finally baked at 60°C for 12 hours to obtain KNbO 3 Powder.

[0050] Step two: the 0.2g KNbO obtained in step one 3 Powder added to FeCl 3 ·6H 2 O and Na 2 SO 4 25ml of deionized water, keep the FeCl 3 ·6H 2 O and Na 2 SO 4 The molar ratio is 1:1, while adjusting the FeCl 3 ·6H 2 O and KNbO 3 The molar ratio of the solution is 2:1; add 1.5ml of glacial acetic acid to the solution and stir for 30 minutes; after stirring evenly, add it to a 50ml polytetrafluoroethyl...

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Abstract

The invention discloses a preparation method of a potassium niobate / alpha-iron oxide heterogeneous photocatalyst. The preparation method comprises the following steps: firstly, preparing KNbO3; addingthe KNbO3 powder into an aqueous solution of FeCl3. 6H2O and Na2SO4, adding glacial acetic acid, uniformly stirring, adding into a reaction kettle, carrying out hydrothermal reaction, washing and drying a reaction product after cooling, and finally calcining to obtain the KNbO3 / alpha-Fe2O3 heterogeneous photocatalyst. 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 KNbO3 / alpha-Fe2O3 heterogeneous photocatalyst obtained through the method is large in number of active sites, 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 method for preparing a potassium niobate / α-iron oxide heterogeneous photocatalyst. Background technique [0002] Since the 1970s, Japanese scientists first used TiO 2 Since the successful realization of water splitting as photocatalytic materials, semiconductor photocatalysis technology has attracted the attention of more and more scientists at home and abroad. Through photocatalytic technology, we can successfully convert solar energy into chemical energy, such as photocatalytic water splitting to produce hydrogen, photocatalytic reduction of carbon dioxide and other organic fuels. In addition to applications in the energy field, photocatalytic technology can also be applied in environmental fields such as sewage treatment and indoor air purification. Therefore, photocatalytic technology is considered to be a very promising green technology for successfully utilizing solar ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847C02F1/30C02F101/38C02F101/30
CPCB01J23/8474C02F1/30C02F2305/10C02F2101/38C02F2101/30B01J35/39Y02E60/36
Inventor 崔永飞孙欢欢郭鹏景盼盼
Owner SHAANXI UNIV OF SCI & TECH
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