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Method for preparing self-assembly Bi12TiO20 micro-flowers by solution method

A self-assembly, micro-flower technology, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve the process conditions without proposing new technical solutions, affecting the physical and chemical properties of bismuth titanate materials, and not exploring the morphology and other problems, to achieve the effect of extending the effective optical frequency response range, low cost, and non-toxic cost

Inactive Publication Date: 2010-07-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Numerous studies have shown that Bi 12 TiO 20 It is indeed a good photocatalyst, but no new technical solutions have been proposed for the process conditions, and no new morphology has been explored, which greatly affects the physical and chemical properties of bismuth titanate materials.

Method used

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Experimental program
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Embodiment Construction

[0010] Weigh 0.85mol bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) and 0.15mol tetraethyl titanate (Ti(OC 3 h 7 ) 4 ), it was dissolved in 10ml deionized water, stirred for 30 minutes, adjusted pH value at 14 with potassium hydroxide (KOH), then added dropwise 0.125mmol polyvinyl alcohol solution (mass concentration was 17.5%), and its precursor solution was stirred 30 minutes, and the solution was ultrasonically dispersed for another 30 minutes. The solution was then transferred to a polytetrafluoroethylene-lined reaction vessel, and deionized water was added to bring the reaction vessel to 80% fill. The reaction temperature of the precursor solution is 150° C., and the reaction time is 24 hours. After the reaction is completed, the product is separated from the reactant with a centrifuge (separation speed 3000rpm), and then washed with deionized water for 3 times, and then dried at 80°C to obtain Bi with high catalytic performance. 12 TiO 20 micron flower.

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Abstract

The invention relates to a method for preparing self-assembly Bi12TiO20 micro-flowers by a solution method, and belongs to preparation technology of a photocatalytic material. The method comprises the following steps: mixing bismuth nitrate and tetraethyl titanate in a molar ratio of 0.571-0.857 to 0.429-0.143, adding deionized water into the mixture, and adjusting the pH of solution by using potassium hydroxide; dripping solution of polyvinyl alcohol into the prepared solution, and stirring and performing ultrasonic dispersion to obtain solution of precursor; transferring the solution of precursor to a reaction kettle, adding the deionized water into the reaction kettle, and performing reaction for 1 to 32 hours at the temperature of between 120 and 160 DEG C; separating out a product from reactants by adopting a centrifugal separator, washing the product with the deionized water and drying the washed product to obtain the self-assembly Bi12TiO20 micro-flowers. The method has the advantages that: the preparation process is simple; and the prepared Bi12TiO20 micro-flowers have excellent photocatalytic performance under the condition of visible light.

Description

technical field [0001] The invention relates to a solution method self-assembly Bi 12 TiO 20 The preparation method of the micron flower belongs to the preparation technology of photocatalytic materials. Background technique [0002] TiO as a semiconductor photocatalyst 2 , due to its chemical and biological inertness, high stability, non-toxicity and low cost, it has been widely studied and applied in environmental pollution control technology and photohydrolysis hydrogen production. But TiO 2 Two inherent defects limit its practical application [(a) A.Fujishima, K.Honda, Nature 1972, 238, 37-38; (b) A.Fujishima, T.N.Rao, D.A.Tryk, J.Photochem.Photobiol .C 2000, 1, 1-21; (c) D.A. Tryk, A. Fujishima, K. Honda, Electrochim. Acta 2000, 45, 2363-2376; (d) R. Levinson, P. Berdahl, H. Akbari, Sol. Energy Mater. Sol. Cells 2005, 89, 319-349]: (1) TiO 2 The bandgap of TiO is wide, and it can only be excited by ultraviolet light with a wavelength of less than 386.5nm, while vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00
Inventor 侯军刚曲远方
Owner TIANJIN UNIV