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Bismuth titanate niobate nanosheet based on self-doping regulation and control of crystal face exposure and preparation method of bismuth titanate niobate nanosheet

A technology of self-doping and titanium niobic acid, applied in the field of photocatalysis, can solve the problems of complex crystal plane regulation and other problems, and achieve the effects of excellent photodegradation efficiency, efficient photodegradation of organic pollutants, and low temperature

Pending Publication Date: 2022-08-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a titanium-bismuth niobate nanosheet and a preparation method based on self-doping regulation and control of crystal surface exposure, so as to overcome the problem existing in the prior art that in order to improve the photocatalytic performance of the material, crystallization Facing the problem of complex control procedures

Method used

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  • Bismuth titanate niobate nanosheet based on self-doping regulation and control of crystal face exposure and preparation method of bismuth titanate niobate nanosheet
  • Bismuth titanate niobate nanosheet based on self-doping regulation and control of crystal face exposure and preparation method of bismuth titanate niobate nanosheet
  • Bismuth titanate niobate nanosheet based on self-doping regulation and control of crystal face exposure and preparation method of bismuth titanate niobate nanosheet

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preparation example Construction

[0029] A preparation method of bismuth titanium niobate nanosheets based on self-doping regulation of crystal plane exposure, comprising the following steps:

[0030] Step 1: Put Bi 2 O 3 , TiO 2 , Nb 2 O 5 And the salt compound is uniformly mixed by ball milling and dried to obtain a mixed powder;

[0031] Step 2: After calcining the mixed powder in Step 1, a massive solid is obtained, and after washing and drying, the bismuth titanate niobate nanosheets whose crystal planes are exposed by self-doping control are obtained.

[0032] The salt compounds are NaCl and KCl.

[0033] In described step 1, NaCl, KCl, Bi 3 Ti x Nb 2-x O 9 The molar ratio is 50:50:1.

[0034] In the step 1, Bi 2 O 3 , TiO 2 with Bi 3 Ti x Nb 2-x O 9 The molar ratio is 1.5:(0.95-1.25):(0.375-0.525);

[0035] In the described step 1, the ball milling conditions are specifically: the analytically pure Bi 2 O 3 , TiO 2 , Nb 2 O 5 , the salt compound was mixed with 100g of zirconite an...

Embodiment 1

[0047] The self-doped Bi 3 TiNbO 9 Nanosheets, chemical formula Bi 3 Ti x Nb 2-x O 9 , where x=0.95, where x represents the mole percent.

[0048] Preparation of Bi by one-step molten salt method 3 Ti x Nb 2-x O 9 , where x=0.95, including the following steps:

[0049] Step 1: According to the chemical formula Bi 3 Ti x Nb 2-x O 9 (x=0.95), 1.3978g Bi 2 O 3 , 0.1518g TiO 2 , 0.2791g Nb 2 O 5 , 5.844g NaCl, 7.455g KCl, and 25mL absolute ethanol were mixed uniformly by mechanical ball milling for 5h, and then the dried powder was calcined in a muffle furnace, heated to 850°C at 10°C / min, and the holding time was 3h. Cool down to 400°C at 10°C / min, and cool to room temperature with the furnace;

[0050] Step 2: Put the bulk solid in deionized water at 50°C, stir and wash, change the water every 2 hours, wash until there is no white precipitate in the supernatant with silver nitrate, and then dry at 60°C for 16 hours.

Embodiment 2

[0052] The self-doped Bi 3 TiNbO 9 Nanosheets, chemical formula Bi 3 Ti x Nb 2-x O 9 , where x=1.05, where x represents mole percent.

[0053] Preparation of Bi by one-step molten salt method 3 Ti x Nb 2-x O 9 , where x=1.05, including the following steps:

[0054] Step 1: According to the chemical formula Bi 3 Ti x Nb 2-x O 9 (x=1.05), 1.3978g Bi 2 O 3 , 0.1677g TiO 2 , 0.2525g Nb 2 O 5 , 5.844g NaCl, 7.455g KCl, and 25mL absolute ethanol were mixed uniformly by mechanical ball milling for 5h, and then the dried powder was calcined in a muffle furnace, heated to 850°C at 10°C / min, and the holding time was 3h. Cool down to 400°C at 10°C / min, and cool to room temperature with the furnace;

[0055] Step 2: Put the bulk solid in deionized water at 60°C, stir and wash, change the water every 1.5h, wash until there is no white precipitate in the supernatant with silver nitrate, and then dry at 70°C for 12h.

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Abstract

The invention discloses a bismuth titanate niobate nanosheet based on self-doping regulation and control of crystal face exposure and a preparation method, the preparation method comprises the following steps: firstly, according to a chemical formula Bi3TixNb2-xO9, uniformly mixing analytically pure Bi2O3, TiO2 and Nb2O5 and a certain proportion of salt through ball milling, drying, and then roasting the dried powder to obtain a blocky solid; and then washing the blocky solid with deionized water, and finally drying to obtain the self-doped Bi3TiNbO9 nanosheet. The exposure proportion of crystal face exposure is regulated and controlled by regulating and controlling the atomic ratio of Ti and Nb. The preparation process is simple and easy to implement, the reaction temperature is low, the reaction time is short, the material cost is low, the method is suitable for industrial production, and the Bi3TixNb2-xO9 photocatalyst obtained through the method is high in photon-generated carrier separation efficiency and has the excellent performance of photocatalytic degradation of dye.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a bismuth titanium niobate nanosheet based on self-doping control of crystal plane exposure and a preparation method. Background technique [0002] Photocatalytic technology is considered to have broad application prospects in the degradation and removal of organic pollutants due to its green, sustainable and no secondary pollution. In recent years, bismuth layered ferroelectrics have received extensive attention from researchers, and their internal spontaneous polarization fields can effectively drive the separation of photogenerated carriers, which is beneficial to the improvement of photocatalytic efficiency. As a member of the Aurivillius phase of the bismuth layered compound, Bi 3 TiNbO 9 (BTNO) has been reported to be applied in the fields of photodegradation of organic pollutants and water splitting due to its unique energy band and crystal structure, however, its wide band...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00B01J35/00B01J23/644B01J23/20B01J21/06
CPCC01G33/00B01J21/063B01J23/20B01J23/6447C01P2002/72C01P2004/03C01P2004/20C01P2006/60B01J35/39Y02W10/37
Inventor 崔永飞郭鹏王锋辉党培培
Owner SHAANXI UNIV OF SCI & TECH
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