Manganese-doped sillenite photocatalyst, preparation method thereof and application of manganese-doped sillenite photocatalyst in synchronous degradation of hexavalent chromium and organic pollutants

A technology of organic pollutants and photocatalysts, applied in the field of photocatalytic materials, can solve the problem of reducing the recombination rate of photogenerated electron-hole pairs, which has not yet been seen, to improve the photocatalytic reduction efficiency, high sunlight utilization efficiency, and realize The effect of full spectral response

Active Publication Date: 2021-11-02
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The semiconductor bismuth-based catalytic material is a new type of visible light-responsive photocatalyst, and the doping of manganese can effectively reduce the recombination rate of photogenerated electron-hole pairs. 12 MnO 20 Research Report on Simultaneous Degradation of Hexavalent Chromium and Organic Pollutants

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  • Manganese-doped sillenite photocatalyst, preparation method thereof and application of manganese-doped sillenite photocatalyst in synchronous degradation of hexavalent chromium and organic pollutants
  • Manganese-doped sillenite photocatalyst, preparation method thereof and application of manganese-doped sillenite photocatalyst in synchronous degradation of hexavalent chromium and organic pollutants
  • Manganese-doped sillenite photocatalyst, preparation method thereof and application of manganese-doped sillenite photocatalyst in synchronous degradation of hexavalent chromium and organic pollutants

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Embodiment 1

[0052] The embodiment of the present invention provides a kind of manganese-doped soft bismuth ore Bi 12 MnO 20 The preparation method of photocatalyst specifically comprises the following steps:

[0053] (1) Take 6 mmol of bismuth trioxide, dissolve it in 40 ml of hydrochloric acid with a mass fraction of 38%, and control its pH to 1.8 ± 0.2, and keep stirring at room temperature for 40 min to obtain a transparent and clear solution;

[0054] (2) Adding 1mmol manganese chloride tetrahydrate to the transparent clear solution, adding 20ml concentration while stirring at room temperature is a sodium hydroxide solution of 1mol / L, and continuing to stir for 30 minutes to obtain a suspension with a pH of 11.5;

[0055] (3) Transfer the suspension to a flask with a condensing reflux device, heat and stir in an oil bath at 120°C for 6 hours, then filter and wash with deionized water for 3 times to obtain a precipitate;

[0056] (4) The precipitate was dried in an oven at 100° C. fo...

Embodiment 2

[0058] The embodiment of the present invention provides a kind of manganese-doped soft bismuth ore Bi 12 MnO 20 The preparation method of photocatalyst specifically comprises the following steps:

[0059] (1) Take 6 mmol of bismuth chloride, dissolve it in 25 ml of hydrochloric acid with a mass fraction of 38%, and control its pH to 1.8 ± 0.2, and continue stirring at room temperature for 45 min to obtain a transparent and clear solution;

[0060] (2) Add 0.5mmol manganese chloride tetrahydrate to the transparent clear solution, add 10.0ml concentration of sodium hydroxide solution that is 1mol / L while stirring at room temperature, continue to stir for 30 minutes to obtain a suspension that has a pH of 10.8 ;

[0061] (3) Transfer the suspension to a flask with a condensing reflux device, heat and stir in an oil bath at 125°C for 5.5 hours, then filter and wash with deionized water for 3 times to obtain a precipitate;

[0062] (4) The precipitate was dried in an oven at 100...

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Abstract

The invention discloses a manganese-doped sillenite photocatalyst, a preparation method thereof and application of the manganese-doped sillenite photocatalyst in synchronous degradation of hexavalent chromium and organic pollutants, and the preparation method comprises the following steps: adding a Bi-containing raw material into hydrochloric acid, uniformly conducting mixing at room temperature to obtain a transparent clear solution, then adding a Mn-containing raw material, conducting stirring, adding excessive alkali liquor, continuous stirring to obtain a turbid liquid, finally, heating and stirring the turbid liquid in an oil bath, conducting reacting for 5-7 hours at the temperature of 110-130 DEG C, and then collecting the precipitate, thereby obtaining the product. According to the preparation method disclosed by the invention, by optimizing the addition amount of concentrated hydrochloric acid and alkali liquor and reasonably controlling the hydrothermal reaction temperature and time, the pure-phase Bi12MnO20 is promoted to expand and grow towards a two-dimensional plane on the basis of ensuring that the pure-phase Bi12MnO20 is obtained, and the Bi12MnO20 with a sheet structure is prepared; and the photocatalyst can generate electrons with strong reducibility and holes with strong oxidizability under illumination, can synchronously degrade hexavalent chromium and organic pollutants, can improve the photocatalytic reduction efficiency, and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, more specifically, relates to a Bi 12 MnO 20 Photocatalyst and its preparation method and application in simultaneous degradation of hexavalent chromium and organic pollutants. Background technique [0002] In recent years, water pollution, especially the pollution caused by sewage containing hexavalent chromium heavy metals and refractory organic matter, has become the focus and difficulty of sewage treatment due to its high toxicity, high concentration and difficulty in natural degradation, which has caused great harm to the environment and human beings. However, in the actual discharged wastewater, heavy metals often coexist with organic pollutants to form composite sewage, which will greatly increase the difficulty of effective treatment. [0003] Photocatalysis is a new type of green sewage treatment technology, which can reduce toxic and harmful pollutants to weakly toxic...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/10B01J35/02C02F1/30C02F101/30C02F101/38
CPCB01J23/34C02F1/30C02F2305/10C02F2101/308C02F2101/38B01J35/39B01J35/40B01J35/612Y02W10/37
Inventor 湛菁王焕伟
Owner CENT SOUTH UNIV
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