Flaky bismuth subnitrate and preparation method thereof

A technology of bismuth nitrate and flaky base, applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of low photoconversion efficiency, electrons and holes cannot migrate in time, achieve high catalytic activity, reduce production The effect of wide adjustable range of cost and parameters

Inactive Publication Date: 2019-06-21
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the photogenerated electron-hole pairs generated by it are easy to recombine, resulting in the inability of electrons and holes to migrate to the surface in time to participate in redox reactions, resulting in low photoconversion efficiency.

Method used

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  • Flaky bismuth subnitrate and preparation method thereof
  • Flaky bismuth subnitrate and preparation method thereof
  • Flaky bismuth subnitrate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A flaky bismuth subnitrate with the chemical formula Bi 6 o 6 (OH) 2 (NO 3 ) 4 2H 2 O. The shape of the flaky bismuth subnitrate is hexagonal flaky, and the particle size (diameter) is 2-3um.

[0038] The preparation method of described flaky bismuth subnitrate, concrete steps are:

[0039] 1) Measure 120.0 mL of deionized water into a reaction vessel, add 30.0 mL of concentrated HNO with a concentration of 65-68% by mass 3 , ultrasonic treatment promotes uniform dispersion of the solution to obtain a nitric acid solution;

[0040] 2) Weigh 17.4gBi(NO 3 ) 3 ·5H 2 O, join 150mL above-mentioned step 1) in the solution gained, ultrasonic dispersion, make it dissolve uniformly, obtain bismuth nitrate solution;

[0041] 3) Measure 15mL of the solution obtained in the above step 2), add it to a single-necked flask filled with 85.0mL deionized water, stir continuously and heat to 60°C, add 40mL aqueous solution dissolved with 4gHTMA after 30min, and continue heating...

Embodiment 2

[0046] A flaky bismuth subnitrate with the chemical formula Bi 6 o 6 (OH) 2 (NO 3 ) 4 2H 2 O. The shape of the flaky bismuth subnitrate is hexagonal flaky, and the particle size (diameter) is 2-3um.

[0047] The preparation method of described flaky bismuth subnitrate, concrete steps are:

[0048] 1) Measure 120.0 mL of deionized water into a reaction vessel, add 30.0 mL of concentrated HNO with a concentration of 65-68% by mass 3 , ultrasonic treatment promotes uniform dispersion of the solution to obtain a nitric acid solution;

[0049] 2) Weigh 17.4gBi(NO 3 ) 3 ·5H 2 0, join in the solution that 150mL above-mentioned step (1) gains, ultrasonic dispersion makes it dissolve uniformly, obtains bismuth nitrate solution;

[0050] 3) Measure 15mL of the solution obtained in the above step (2), add it to a single-necked flask filled with 100mL deionized water, stir continuously and heat to 80°C, add 40mL aqueous solution dissolved with 6gHTMA after 30min, and continue h...

Embodiment 3

[0054] Degradation experiment of dye wastewater

[0055] Weigh 0.03 g of the sample, add 100 mL of RhB aqueous solution respectively, in which the concentration of RhB is 10 mg / L, and stir for 30 min in the dark to make the dye reach the adsorption / desorption equilibrium on the surface of the catalyst. Then turn on the xenon lamp light source (300W xenon lamp, the optical filter filters out light waves with a wavelength below 400nm), carry out photocatalytic reaction under visible light irradiation, and detect the supernatant with a spectrophotometer. According to the Lambert–Beer law, the change in the intensity of the characteristic absorption peak of organic matter can be used to quantitatively calculate the change in its concentration. When the light-absorbing substances are the same and the thickness is the same, the change of the absorbance can be used to directly represent the change of the solution concentration. Because RhB has a characteristic absorption peak at 554...

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Abstract

The invention provides a preparation method of flaky bismuth subnitrate. The preparation method is characterized by comprising the following steps: 1, putting Bi(NO3)3*5H2O into a nitric acid solution, and carrying out ultrasonic dispersion so as to obtain a bismuth nitrate solution; 2, putting the bismuth nitrate solution obtained in the step 1 into deionized water, continuously stirring, heatingto 40-80 DEG C, adding a solution of hexamethylenetetramine 25-35 minutes later, continuously stirring for 2.0-3.0 hours at 40-80 DEG C, stopping heating, further stirring for 1.0-2.0 hours, and leaving to stand for 10-20 minutes, pouring off supernate so as to obtain precipitate; 3, putting deionized water into the obtained precipitate, leaving to stand for 10-20 minutes, and pouring off supernate; 4, repeating the step 3 for 1-3 times, respectively washing for 3-5 times with deionized water and absolute ethyl alcohol, centrifuging, collecting precipitate, dispersing with absolute ethyl alcohol into a crucible, and drying at 60-100 DEG C, thereby obtaining the flaky bismuth subnitrate. The flaky bismuth subnitrate prepared by using the method is good in catalyst morphology and high in catalysis activity, is capable of degrading RhB by 97% or greater within 180 minutes when being used as a photocatalyst, and has good application prospects.

Description

technical field [0001] The present invention relates to a Bi 6 o 6 (OH) 2 (NO 3 ) 4 2H 2 O and a preparation method thereof, in particular to a flaky basic bismuth nitrate and a preparation method thereof, belonging to the technical field of inorganic nanometer materials and synthesis. Background technique [0002] With the rapid development of human society, people are facing two very serious problems of energy and environment, especially the environmental pollution caused by toxic and refractory organic pollutants (such as polycyclic aromatic hydrocarbons, polychlorinated biphenyls, pesticides, dyes, etc.) It has become a major issue affecting human survival and health. These untreated organic pollutants are directly or indirectly discharged into water bodies, which will not only affect the visual effect but also affect the living environment of aquatic organisms and human beings. Some dyes can absorb sunlight without being biodegraded, which will affect the photosy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G29/00B01J27/25
Inventor 孔书麟张问问高少敏安昭辉周会平陈东辉
Owner SHANGHAI INST OF TECH
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