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Visible light photocatalyst containing amorphous MgAl2O4 and preparation method thereof

An amorphous and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve rapid reaction, avoid system instability, and simple preparation process

Inactive Publication Date: 2011-09-28
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis of simple metal oxides, perovskite-type and spinel-type oxides by liquid-phase combustion methods has been reported, including the synthesis of magnesium-aluminum spinel crystals using urea, sucrose or glycine as fuel (Ganesh et al. Brit. Ceram. T., 2002, 101, 247-254; Bai et al. Sci. Sinter., 2010, 42, 133-141), but crystals were synthesized by liquid phase combustion Magnesium-aluminum spinel in mixed state with amorphous state has not been reported yet

Method used

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  • Visible light photocatalyst containing amorphous MgAl2O4 and preparation method thereof
  • Visible light photocatalyst containing amorphous MgAl2O4 and preparation method thereof
  • Visible light photocatalyst containing amorphous MgAl2O4 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use urea and glycine as fuel, mix according to the molar ratio of magnesium nitrate: aluminum nitrate: urea: glycine = 1:2:1:5, heat on an electric furnace until it melts into a liquid, and then continue heating to completely burn the liquid to form a solid; The resulting solid is cooled to room temperature and ground to obtain a tan nanopowder, which is amorphous MgAl-containing 2 o 4 visible light catalyst.

[0025] Carry out XRD, SEM and UV-Vis DRS test respectively to above-mentioned catalyst, test pattern is as follows respectively figure 1 Mid-spectrum line a, diagram 2-1 with Figure 4 The middle spectrum line a shows. from figure 1 It was calculated that the above catalyst contained crystalline MgAl 2 o 4 and amorphous MgAl 2 o 4 The weight percentages are 15.0% and 85.0%, respectively. from diagram 2-1 It can be seen that the catalyst prepared in this example is loose and porous, and its specific surface area (BET) is measured to be 33.8m 2 / g; ...

Embodiment 2

[0028] Use urea and DL-alanine as fuel, mix according to the molar ratio of magnesium nitrate: aluminum nitrate: urea: DL-alanine = 1:2:7:1, heat on an electric furnace until it melts into a liquid, and then continue heating The liquid is completely burned to form a solid; the resulting solid is cooled to room temperature and ground to obtain a tan nano-powder, which is amorphous MgAl-containing 2 o 4 visible light catalyst.

[0029] Carry out XRD and UV-Vis DRS test respectively to above-mentioned catalyst, test pattern is as follows respectively figure 1 Mid-spectral line b and Figure 4 In the spectral line b shown. From figure 1 It was calculated that the above catalyst contained crystalline MgAl 2 o 4 and amorphous MgAl 2 o 4 The weight percentages are 31.5% and 68.5%, respectively. Its BET is 29.7m 2 / g. From Figure 4 It can be seen from the figure that the catalyst prepared in this example has good absorption in the light region of 400-800nm.

[0030] Th...

Embodiment 3

[0032] Use urea and methyl carbamate as fuel, mix according to the molar ratio of magnesium nitrate: aluminum nitrate: urea: methyl carbamate = 1:2:5:4, heat on an electric furnace until it melts into a liquid, and then continue heating to make the liquid Complete combustion forms a solid; cool the resulting solid to room temperature and grind to obtain a tan nanopowder, which is amorphous MgAl-containing 2 o 4 visible light catalyst.

[0033] Carry out XRD, SEM, TEM and UV-Vis DRS test respectively to above-mentioned catalyst, test pattern is as follows respectively figure 1 Mid-spectral line c, Figure 2-2 , image 3 and Figure 4 In the spectral line c shown. From figure 1 It was calculated that the above catalyst contained crystalline MgAl 2 o 4 and amorphous MgAl 2 o 4 The weight percentages are 45.5% and 54.5%, respectively. From Figure 2-2 It can be seen that its porosity is reduced compared with the catalyst prepared in Example 1, and its BET is measured...

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Abstract

The invention discloses a visible light photocatalyst containing amorphous MgAl2O4 and a preparation method thereof. The visible light photocatalyst containing amorphous MgAl2O4 comprises 15 to 98 wt% of crystal MgAl2O4 and 2 to 85 wt% of amorphous MgAl2O4. The preparation method comprises the following steps: 1, treating urea as a fuel A and selecting one of glycine, methyl carbamate, 1-nitropropane, DL-alanine, L-alanine and beta-alanine as a fuel B; mixing magnesium nitrate, aluminium nitrate, the fuel A and the fuel B according to a molar ratio of 1:2:(1 to 8):(1 to 15), and fusing to a liquid through heating on an electric furnace; 2, forming a solid through carrying out complete combustion on the liquid by continuing heating; and 3, cooling the solid formed in step 2 to room temperature and grinding. So the visible light photocatalyst containing amorphous MgAl2O4 is obtained. The preparation method has the advantages of simple operation, short time and low cost, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a visible light catalyst and a preparation method thereof, in particular to a catalyst containing amorphous MgAl 2 o 4 Visible light catalyst and its preparation method. Background technique [0002] Photocatalytic oxidation technology is a semiconductor photocatalyst that separates electrons and holes under light, and the holes generated can effectively oxidize and degrade organic matter. It is an emerging technology for treating wastewater, degrading toxic gases, etc., and has broad application prospects. [0003] Among many photocatalysts, nano-TiO 2 It has been extensively studied for its high photocatalytic efficiency, good chemical stability, and non-toxicity. For example, the Chinese patent CN1370619A disclosed on September 25, 2002 reported that "a kind of loaded nano TiO 2 Preparation method of photocatalyst". The invention adopts TiO 2 Inorganic sol as the main binder, nano anatase TiO 2 Combined with the additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02B01J35/10B01J37/08C02F1/30
CPCY02W10/37
Inventor 李发堂赵叶刘英刘瑞红赵地顺
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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