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Preparation method and application of highly active bismuth chromate nano photocatalyst

A nano-photocatalyst and photocatalyst technology, applied in the field of nano-materials, can solve the problems of narrow light absorption range, poor photostability, and low efficiency, and achieve the effect of wide light absorption range, strong mineralization ability, and simple operation

Active Publication Date: 2018-04-27
TSINGHUA UNIV
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Problems solved by technology

Despite the rapid development of photocatalytic oxygen-generating catalysts in recent years, such as bismuth vanadate, oxides, etc., although the oxygen-generating performance of these catalysts has improved, the efficiency is still very low, mainly due to the following aspects: (1) light Narrow absorption range; (2) fast recombination of photogenerated electron-hole pairs; (3) poor photostability

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  • Preparation method and application of highly active bismuth chromate nano photocatalyst

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preparation example Construction

[0037] The preparation method of the highly active bismuth chromate nano photocatalyst that the present invention proposes comprises the following steps:

[0038] (1) Dissolve bismuth nitrate pentahydrate and chromium nitrate nonahydrate in aqueous mannitol solution at room temperature to obtain a lavender transparent solution, wherein the concentration of bismuth nitrate pentahydrate is 0.02 to 0.08 mol / L, and bismuth nitrate pentahydrate The molar ratio to chromium nitrate nonahydrate is 12:1, and the concentration of mannitol solution is 0.5-5mol / L;

[0039] (2) Add 1 to 5 ml of saturated sodium carbonate aqueous solution dropwise to the solution of the above step (1), and continuously stir to obtain a lavender emulsion;

[0040] (3) Transfer the emulsion in the above step (2) to a hydrothermal reaction kettle, react at 130-180°C for 6-12 hours, and after natural cooling, a gray-green precipitate is obtained;

[0041] (4) Filter the precipitate in the above step (3), colle...

Embodiment 1

[0052] Embodiment 1, preparation bismuth chromate photocatalyst

[0053](1) At room temperature, bismuth nitrate pentahydrate and chromium nitrate nonahydrate are dissolved in mannitol aqueous solution to obtain a lavender transparent solution, wherein the concentration of bismuth nitrate pentahydrate is 0.04mol / L (bismuth nitrate pentahydrate and chromium nitrate nonahydrate The mol ratio of chromium nitrate hydrate is 12:1), and the concentration of mannitol solution is 0.15mol / L;

[0054] (2) In the solution of above-mentioned step (1), add 5ml saturated sodium carbonate aqueous solution dropwise, stir continuously to obtain the lavender emulsion;

[0055] (3) Transfer the emulsion in the above step (2) to a hydrothermal reaction kettle, react at 150° C. for 12 hours, and after natural cooling, a gray-green precipitate is obtained;

[0056] (4) Filter the precipitate in the above step (3), collect the solid, fully wash the solid with deionized water, and vacuum-dry the sol...

Embodiment 2

[0059] Embodiment 2, preparation bismuth chromate photocatalyst

[0060] (1) At room temperature, bismuth nitrate pentahydrate and chromium nitrate nonahydrate are dissolved in mannitol aqueous solution to obtain a lavender transparent solution, wherein the concentration of bismuth nitrate pentahydrate is 0.08mol / L (bismuth nitrate pentahydrate and chromium nitrate nonahydrate The mol ratio of chromium nitrate hydrate is 12:1), and the concentration of mannitol solution is 0.2mol / L;

[0061] (2) In the solution of above-mentioned steps (1), add 2ml saturated sodium carbonate aqueous solution dropwise, stir continuously to obtain the lavender emulsion;

[0062] (3) Transfer the emulsion in the above step (2) to a hydrothermal reaction kettle, react at 180° C. for 6 hours, and after natural cooling, a gray-green precipitate is obtained;

[0063] (4) Filter the precipitate in the above step (3), collect the solid, fully wash the solid with deionized water, and vacuum-dry the sol...

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Abstract

The invention relates to a preparation method and application of a highly active bismuth chromate nano photocatalyst, and belongs to the technical field of nanomaterials. The preparation method comprises the steps: firstly, dissolving bismuth nitrate pentahydrate and chromic nitrate nonahydrate in a mannitol aqueous solution; dropwise adding a saturated sodium carbonate aqueous solution into the solution, and stirring evenly to obtain an emulsion; transferring the emulsion to a hydrothermal reaction kettle, carrying out a hydrothermal reaction, cooling to room temperature, centrifuging, washing and drying to obtain a precursor powder, and calcining the precursor powder, to obtain the bismuth chromate nano photocatalyst. The bismuth chromate nano photocatalyst prepared by the method has thesize in a range of 40-50 nm, and a light absorption band edge can be extended to a red light region; at the same time, the bismuth chromate nano photocatalyst has high-efficiency pollutant photocatalysis degradation and oxygen producing activity in a visible region, the oxygen producing quantum efficiency at 600 nm reaches 1.52%, and the bismuth chromate nano photocatalyst has quite good light stability. The preparation method provided by the method has cheap raw materials, has simple process, is suitable for industrialized mass production, and has good application prospects.

Description

technical field [0001] The invention relates to a preparation method and application of a highly active bismuth chromate nano photocatalyst. The molecular formula of the highly active bismuth chromate is Bi 7.38 Cr 0.62 o 12+x , belonging to the field of nanomaterial technology. Background technique [0002] Since the discovery of the Honda-Fujishima effect, the use of semiconductor photocatalysts to directly split water has become one of the most ideal ways to utilize solar energy and convert it into chemical energy. However, a very high overpotential is usually required to achieve a practical hydrogen evolution rate, which is mainly a consequence of the slow kinetics of the oxygen evolution reaction. Despite the rapid development of photocatalytic oxygen-generating catalysts in recent years, such as bismuth vanadate, oxides, etc., although the oxygen-generating performance of these catalysts has improved, the efficiency is still very low, mainly due to the following asp...

Claims

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Application Information

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IPC IPC(8): B01J23/26C02F1/30C01B13/02C01G37/14C02F101/30
CPCC01B13/0207C01G37/14C02F1/30B01J23/26C02F2305/10C01P2004/64C02F2101/30B01J35/39B01J35/40
Inventor 朱永法陈先杰
Owner TSINGHUA UNIV
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