Method for improving bismuth ferrotitanium oxide nano-powder aggregation

A nano-powder and oxide technology, which is applied in the direction of iron compounds, chemical instruments and methods, nanotechnology, etc., can solve the problem of improving agglomeration, difficult to inhibit the agglomeration of powder particles, and expand the distance between grains, so as to improve the problem of agglomeration , good monodispersity, improve the effect of agglomeration

Active Publication Date: 2017-09-08
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, when improving the agglomeration problem of bismuth-iron-titanium oxide powder, it is usually by changing the preparation conditions such as changing the concentration of the precursor, reaction temperature and time, pH value, surfactant, washing and drying during the preparation of the product. Among them, the most important thing is to add organic surfactants or blocking agents in the liquid phase synthesis process. These surfactants are selectively adsorbed on the surface of the crystal grains. Due to the steric hindrance effect, the gap between the grains is enlarged. The distance between them can theoretically control the agglomeration phenomenon during synthesis; however, according to current literature reports, in practical applications, it is difficult to inhibit the agglomeration of powder particles even with the use of surfactants; in addition, even if the agglomeration phenomenon is improved during synthesis , in the process of separating and collecting the oxide powder particles from the liquid phase, agglomeration will occur again due to complex incentives such as the nano-small size effect
Therefore, for bismuth-iron-titanium oxide nanopowders, it is difficult to improve the agglomeration problem by adjusting the experimental conditions during the synthesis process and particle collection process.

Method used

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  • Method for improving bismuth ferrotitanium oxide nano-powder aggregation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1.1 Sample preparation:

[0054] Provide 50mL of acetic acid solution with a mass concentration of 0.39% (concentration of acetic acid with a concentration of 98% and water in a volume ratio of 4:1000), while stirring, slowly add Bi prepared by the co-precipitation method 7 Fe 3 Ti 3 O 21 0.1g nano powder to obtain a suspension; seal the obtained suspension and perform low-speed magnetic stirring at a rotation speed of 200r / min for 3h to obtain a mixed liquid; place the obtained mixed liquid in an ultrasonic disperser for ultrasonic dispersion for 1 hour (60W, 50KHz , 28°C), to obtain a dispersion; centrifuge the obtained dispersion at a high speed of 10000r / min, and then wash with deionized water to a pH of about 7 to remove the supernatant to obtain a solid washing; place the obtained solid washing After mixing well in 50mL deionized water, it is freeze-dried. After the ice cubes sublimate, Bi with good monodispersity with significantly reduced agglomeration is obtained 7...

Embodiment 2

[0063] It was carried out according to the dispersion method of Example 1, except that the concentration of the acetic acid solution was 1.92% (the acetic acid with a concentration of 98% and water were prepared at a volume ratio of 20:1000).

[0064] The sample was subjected to X-ray diffraction test according to the characterization method of Example 1. The results showed that before and after the dispersion treatment, the X-ray pattern of the sample was consistent with the standard pattern, and the substance was relatively pure, which proved that the dispersion treatment of the present invention has not changed and Destroy Bi 7 Fe 3 Ti 3 O 21 The crystal structure of nanoparticles.

[0065] Scanning electron microscopy (SEM) test was performed on the sample according to the characterization method of Example 1. The results showed that after the dispersion method of the present invention was implemented, the obtained Bi 7 Fe 3 Ti 3 O 21 In the nano-powder, the phenomenon of partic...

Embodiment 3

[0067] Follow the dispersion method in Example 1, except that the acetic acid solution is replaced with a hydrochloric acid solution.

[0068] The sample was subjected to X-ray diffraction test according to the characterization method of Example 1. The results showed that before and after the dispersion treatment, the X-ray pattern of the sample was consistent with the standard pattern, and the substance was relatively pure, which proved that the dispersion treatment of the present invention has not changed and Destroy Bi 7 Fe 3 Ti 3 O 21 The crystal structure of nanoparticles.

[0069] Scanning electron microscopy (SEM) test was performed on the sample according to the characterization method of Example 1. The results showed that after the dispersion method of the present invention was implemented, the obtained Bi 7 Fe 3 Ti 3 O 21 In the nano-powder, the phenomenon of particle agglomeration has been significantly improved, and the crystal grains with a size of about 100 nm exist in...

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Abstract

The invention provides a method for improving bismuth ferrotitanium oxide nano-powder aggregation. The method comprises the steps that 1, bismuth ferrotitanium oxide nano-powder and acid liquor are mixed, and suspension is obtained; 2, the suspension is subjected to sealing standing or sealing stirring, and mixed liquor is obtained; 3, the mixed liquor is subjected to ultrasonic dispersion, and dispersion liquid is obtained; 4, the dispersion liquid is subjected to centrifugation, washing and freeze drying, and a dispersed product is obtained. By means of the method, the bismuth ferrotitanium oxide powder aggregation problem can be effectively solved, the crystal structure and morphology of bismuth ferrotitanium oxide particles cannot be destroyed, and the bismuth ferrotitanium oxide nano particles good in monodispersity can be obtained.

Description

Technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a method for improving the agglomeration of bismuth iron titanium oxide nano powders. Background technique [0002] Bismuth-iron-titanium oxide is a single-phase compound with a layered perovskite crystal structure, the general formula is Bi m+ 1 Fe m-3 Ti 3 O 3m+3 (m≤10), it has many properties such as polarization order, magnetization order and broad spectrum response. In addition, this type of oxide has also received wide attention as a new type of multifunctional photocatalyst. Compared with traditional photocatalysts, this type of oxide has the following unique advantages: ①has good solar spectrum absorption; ②the internal spontaneous polarization has It helps the separation of photogenerated carriers and improves the photocatalytic performance; ③ Its room temperature magnetism enables it to be separated from the reaction liquid and recycled, which is beneficial to sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y30/00
CPCB82Y30/00C01G49/0018C01P2002/72C01P2004/03C01P2004/50C01P2004/52C01P2004/62C01P2004/64
Inventor 陆亚林傅正平李晓宁殷小丰顾文
Owner UNIV OF SCI & TECH OF CHINA
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