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Visible light nano bismuth magnesium composite oxides photocatalyst and preparation method thereof

A composite oxide, photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of limited types of photocatalysts and achieve good applications Prospects, Promotion of Practicalization, Efficient Photocatalytic Degradation Effect

Inactive Publication Date: 2009-02-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The types of photocatalysts with visible light response reported so far are still very limited, so it is very necessary to study new high-efficiency photocatalysts with visible light activity.

Method used

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  • Visible light nano bismuth magnesium composite oxides photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] Visible light nano bismuth magnesium composite oxide photocatalyst, it comprises the steps:

[0023] 1) Take by weighing 0.1264 gram of sodium bismuthate, according to the mol ratio of magnesium chloride and sodium bismuthate is 5:1, choose magnesium chloride and sodium bismuthate, standby; Make 0.05 mol / L magnesium chloride solution with deionized water; Bismuth acid Add sodium into the prepared magnesium chloride solution in the form of solid powder, stir the mixed solution for 20 minutes, and mix well to obtain a suspension;

[0024] 2) Transfer the above suspension into a 100ml stainless steel reaction kettle lined with polytetrafluoroethylene, add deionized water to 70ml, the filling degree is 70%, do not add hydrochloric acid, at the natural pH value (8-9) Put it in a constant temperature oven after closing the lid tightly, and keep it at 130°C for 6 hours;

[0025] 3) After cooling to room temperature, the reacted product was taken out, washed with deionized wat...

Embodiment 2

[0030] Visible light nano bismuth magnesium composite oxide photocatalyst, it comprises the steps:

[0031] 1) Take by weighing 0.1264 gram of sodium bismuthate, according to the mol ratio of magnesium chloride and sodium bismuthate is 5:1, choose magnesium chloride and sodium bismuthate, standby; Make 0.05 mol / L magnesium chloride solution with deionized water, mix bismuthate Sodium was added into the magnesium chloride solution in the form of solid powder and fully mixed (stirred for 20 minutes) to obtain a suspension;

[0032] 2) Transfer the above suspension into a stainless steel reaction kettle lined with polytetrafluoroethylene, the volume of the reaction kettle is 100 ml, add water to 70 ml, the filling degree is 70%, adjust the pH value to 4 with hydrochloric acid, and cover tightly Put the kettle cover into a constant temperature oven and keep it at 130°C for 6 hours;

[0033] 3) After cooling to room temperature, the reacted product was taken out, washed twice by c...

Embodiment 3

[0036] Visible light nano bismuth magnesium composite oxide photocatalyst, it comprises the steps:

[0037] 1) Take by weighing 0.1264 gram of sodium bismuthate, according to the mol ratio of magnesium chloride and sodium bismuthate is 5:1, choose magnesium chloride and sodium bismuthate, standby; Make 0.05 mol / L magnesium chloride solution with deionized water, mix bismuthate Sodium was added into the magnesium chloride solution in the form of solid powder and fully mixed (stirred for 20 minutes) to obtain a suspension;

[0038] 2) Move the above-mentioned suspension into a stainless steel reaction kettle lined with polytetrafluoroethylene, the volume of the reaction kettle is 100 milliliters, add deionized water according to the hydrothermal reaction filling degree of 70%, without adding hydrochloric acid, at natural pH value (8-9); put the kettle lid tightly and put it in a constant temperature oven, and keep it at 140°C for 4 hours;

[0039] 3) After cooling to room tempe...

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Abstract

The invention relates to a visible-light nanometer catalyst and a preparation method thereof. The visible-light nanometer bismuth-magnesium composite-oxide photo-catalyst is characterized in that the method includes the following steps: 1) magnesium salt and sodium bismuthate are selected according to the mol ratio of 4:1 to 8:1, and the sodium bismuthate is added into the magnesium salt solvent in the form of solid powder and evenly mixed to obtain a suspension; 2) the suspension is transferred into a stainless reaction kettle sheathed with polytetrafluoroethylene, and deionized water is added according to the filling degree of hydrothermal reaction of being 70 percent to 80 percent and maintained for 2 hours to 24 hours under 120 DEG C to 180 DEG C; 3) after the temperature of the kettle is cooled to room temperature, products after reaction are taken out, centrifugally washed by the deionized water and anhydrous alcohol respectively for 1 time to 5 times, and positioned in a constant temperature oven to be dried for 2 hours to 10 hours under 60 DEG C to 80 DEG C so as to obtain the visible-light nanometer bismuth-magnesium composite-oxide photo-catalyst which has excellent visible-light catalytic activity, good stability and promising application prospect.

Description

technical field [0001] The invention relates to a nano photocatalyst and a preparation method thereof, in particular to a photocatalyst comprising 1 to 3 bismuth magnesium compounds and a preparation method thereof, belonging to the field of inorganic nano photocatalytic materials. Background technique [0002] Photocatalytic degradation of environmental pollutants is expected to make full use of solar energy. Due to its outstanding features such as low energy consumption, mild reaction conditions, easy operation, and the ability to reduce secondary pollution, it has attracted increasing attention and has broad application prospects. The principle of photocatalytic reaction is that photocatalytic valence band electrons absorb photons whose energy exceeds the energy corresponding to the band gap, generate excitation to generate photogenerated holes and electrons, and then migrate to the surface of the catalyst to perform redox reactions with adsorbed organic pollutants or wate...

Claims

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Application Information

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IPC IPC(8): B01J23/18B01J23/02A62D3/17
Inventor 张高科熊茜吕凡李名
Owner WUHAN UNIV OF TECH
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