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Method for preparing bismuth ferrite photocatalyst

A technology of photocatalyst and bismuth ferrite, which is applied in the field of environmental science and engineering, can solve the problems of unsolvable catalyst separation, small particle size of bismuth ferrite material, and unresearched photocatalytic activity, so as to facilitate industrialization promotion and process cycle Short, not easy to secondary pollution effect

Inactive Publication Date: 2010-11-24
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent with the publication number CN 101311369 adopts an improved hydrothermal synthesis method, adopts rapid cooling after the completion of the hydrothermal reaction, suppresses the generation of the second phase and the growth of particles, and obtains iron with a pure-phase perovskite structure and ferromagnetism. Bismuth bismuth powder, however, the photocatalytic activity of the powder has not been studied in depth
[0005] The above work has successfully realized the artificial synthesis of bismuth ferrite powder, and the method is relatively mature and stable, but the particle size of the obtained bismuth ferrite material is small, which cannot solve the problem of catalyst separation from water, and is usually accompanied by Bi 2 Fe 4 o 9 or Bi 25 FeO 40 Therefore, it is necessary to further improve its structure and shape, so that it can better serve the water purification industry

Method used

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  • Method for preparing bismuth ferrite photocatalyst
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  • Method for preparing bismuth ferrite photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take by weighing 9.2 grams of P123 block copolymer surfactants, and dissolve it in 100 milliliters of acetic acid (CH 3 COOH) solution to form a concentration of 0.016 mol / liter solution, then weighed 34 grams of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) join in the above-mentioned solution, after dissolving completely, add 2.36 grams of ferric nitrate (Fe(NO 3 )3 9H 2 (2), the molar ratio of bismuth nitrate and ferric nitrate was 12:1 at this moment; By magnetic stirring, the raw material was completely dissolved and became a uniform sol; under stirring, the sol was aged at room temperature for 3 hours to obtain brown Precursor solution; the precursor solution is transferred to a stainless steel reaction kettle with polytetrafluoroethylene lining, the filling degree is 80%, the reaction kettle is sealed, and the reaction kettle is placed in a 150°C electric constant temperature blast drying oven for crystallization Allow it to fully react for 24 hours; t...

Embodiment 2

[0029] Take by weighing 9.2 grams of P123 block copolymer surfactant, it is dissolved in 100 milliliters of acetic acid (CH 3 COOH) solution to form a concentration of 0.016 mol / liter solution, then weighed 34 grams of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) join in the above-mentioned solution, after dissolving completely, add 2.36 grams of ferric nitrate (Fe(NO 3 ) 3 9H 2 (2), the molar ratio of bismuth nitrate and ferric nitrate was 12:1 at this moment; By magnetic stirring, the raw material was completely dissolved and became a uniform sol; under stirring, the sol was aged at room temperature for 3 hours to obtain brown Precursor solution; the precursor solution is transferred to a stainless steel reaction kettle with polytetrafluoroethylene lining, the filling degree is 80%, the reaction kettle is sealed, and the reaction kettle is placed in a 120°C electric constant temperature blast drying oven for crystallization Allow it to fully react for 24 hours; ...

Embodiment 3

[0031] Take by weighing 4.6 grams of P123 block copolymer surfactant, under stirring state, it is dissolved in 100 milliliters of acetic acid (CH 3 COOH) solution to form a concentration of 0.008 mol / liter solution, then weighed 34 grams of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) join in the above-mentioned solution, after dissolving completely, add 2.36 grams of ferric nitrate (Fe(NO 3 ) 3 9H 2 (2), by magnetic stirring, the raw material is completely dissolved and becomes a uniform sol; under stirring, the sol is aged at room temperature for 3 hours to obtain a brown precursor solution; the precursor solution is transferred to a polytetrafluoroethylene In the lined stainless steel reaction kettle, the filling degree is 80%, seal the reaction kettle, and place the reaction kettle in a 130°C electric constant temperature blast drying oven for crystallization for 24 hours to make it fully react; take out the reaction kettle from the oven, Put it into cooling w...

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Abstract

The invention belongs to the fields of environmental science and engineering, and in particular relates to a method for preparing a bismuth ferrite photocatalyst capable of efficiently degrading organic pollutants in water by utilizing photocatalysis technology. The photocatalyst bismuth ferrite is synthesized by a solvent method; and during synthesis, a molar ratio of bismuth nitrate to ferric nitrate is 12:1, a xenon lamp is taken as a light source, and the bismuth ferrite is fully mixed with neural red solutions with different concentrations to photo-catalyze and degrade the neutral red dye in aqueous solution. The invention provides a high-efficiency method for removing the neutral read dye from the water. The method can remove over 70 percent of the neutral red dye (the concentration is 10 to 30 milligrams / liter) from the water in 2 hours; moreover, the photocatalyst has the advantages of simple preparation process, large particle size and easy recycling; and the method has the advantages of easy operation, low cost, high efficiency, time conservation, and good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering, and relates to a multiferroic material, in particular to a ferromagnetic bismuth ferrite photocatalyst and a synthesis method thereof, in particular to a ferromagnetic ferromagnetic bismuth ferrite photocatalyst for degrading organic pollutants in water by photocatalytic technology. Preparation method of bismuth acid photocatalyst. Background technique [0002] Bismuth ferrite (BiFeO 3 ) is a typical single-phase magnetoelectric material and ferroelectric material, which exhibits multiferroic properties above room temperature, and is one of the few materials with both ferroelectricity and antiferromagnetism; it has a trigonal twisted perovskite structure, of which The oxygen octahedron rotates a certain angle around the body diagonal axis to form an oblique hexagonal structure that deviates from the ideal perovskite structure; at room temperature BiFeO 3 It has two kinds of ...

Claims

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Application Information

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IPC IPC(8): B01J23/843B01J35/10C02F1/30C02F101/30
Inventor 牛军峰李阳王文龙包月平
Owner BEIJING NORMAL UNIVERSITY
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