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Porous oxide/titanium dioxide microsphere composite catalytic material and preparation method thereof

A porous oxide, titanium dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, alkali metal oxides/hydroxides, chemical instruments and methods, etc. The problem of large forbidden band width can achieve the effect of improving light utilization rate, accelerating practical process and reducing agglomeration.

Active Publication Date: 2017-10-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 The bandgap width is relatively large (3.2eV), and it can only absorb ultraviolet rays with high energy, so it cannot effectively use sunlight, which limits its practical application.
However, there is no research on the preparation of composite catalytic materials by spray freeze-drying.

Method used

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  • Porous oxide/titanium dioxide microsphere composite catalytic material and preparation method thereof
  • Porous oxide/titanium dioxide microsphere composite catalytic material and preparation method thereof
  • Porous oxide/titanium dioxide microsphere composite catalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: ammonium molybdate and TiO 2 Mix and stir with the pre-configured solution (water+1wt.% polyvinyl alcohol (PVA)+1wt.% sodium dodecylbenzenesulfonate) at a ratio of 10:1 to obtain a uniform slurry, pour the slurry into the atomizer, and then evenly spray the slurry into liquid nitrogen (-196 ° C), the atomized slurry is instantly solidified in liquid nitrogen, and then the solidified powder is transferred to a freeze dryer, Dry at -50°C and 14Pa for 12 hours to sublimate the solid ice to obtain a porous powder. Put the dried powder into a muffle furnace, raise the temperature to 600°C at a rate of 15°C / min and keep it for 4 hours. The sintering process is carried out in an air atmosphere. After the sintering is completed, the sample is taken out with the furnace cooling to obtain MoO 3 -TiO 2 Microsphere composites.

Embodiment 2

[0033] Embodiment 2: ammonium metatungstate and TiO 2 Mix and stir with the pre-configured solution (water + 2wt.% polyvinyl alcohol (PVA) + 0.5wt.% sodium dodecylbenzene sulfonate) at a ratio of 8:1 to obtain a uniform slurry. Pour into an atomizer, and then spray the slurry evenly into liquid nitrogen (-196°C). The atomized slurry is instantly solidified in liquid nitrogen, and then the solidified powder is transferred to a freeze dryer. Dry at -30°C and 8Pa for 18 hours to sublimate the solid ice to obtain a porous powder. Put the dried powder into a muffle furnace, raise the temperature to 450°C at a rate of 10°C / min and keep it for 3 hours. The whole sintering process is carried out in the air atmosphere. After the sintering is completed, the sample is taken out with the furnace cooling, and the WO can be obtained. 3 -TiO 2 Microsphere composites.

Embodiment 3

[0034] Embodiment 3: ammonium metavanadate and TiO 2 Mix and stir with the pre-configured solution (water+3wt.% polyvinyl alcohol (PVA)+0.7wt.% sodium dodecylbenzene sulfonate) at a ratio of 5:1 to obtain a uniform slurry. Pour into an atomizer, and then spray the slurry evenly into liquid nitrogen (-196°C). The atomized slurry is instantly solidified in liquid nitrogen, and then the solidified powder is transferred to a freeze dryer. Dry at -10°C and 2Pa for 24 hours to sublimate the solid ice to obtain a porous powder. Put the dried powder into a muffle furnace, raise the temperature to 300°C at a rate of 2°C / min and keep it for 2 hours. The whole sintering process is carried out in an air atmosphere. After the sintering is completed, the sample is taken out with the furnace cooling, and V 2 o 5 -TiO 2 Microsphere Composite.

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Abstract

The invention provides a porous oxide / titanium dioxide microsphere composite catalytic material and a preparation method thereof. The porous oxide / titanium dioxide microsphere composite catalytic material is applicable to sewage treatment. According to the invention, a mol ratio of titanium dioxide to oxide is 1: 10 to 1: 5, and titanium dioxide and oxide are compounded to form a heterostructure; the diameter of a titanium dioxide microsphere is in a range of 10 to 70 [mu]m, and the interior of the microsphere is of a porous structure; the microsphere has a specific surface area of 20 to 90 m<2> / g; and mixed slurry of a metal ammonium salt and TiO2 powder is uniformly sprayed into liquid nitrogen in the form of mist spray, then freeze drying is carried out in a low-temperature low-pressure environment, and finally, sintering in an air atmosphere is carried out so as to obtain a porous microsphere. The preparation method provided by the invention is simple in process and easy for industrialization. The porous microsphere is prepared by accumulation of a metal oxide nanosheet and TiO2 uniformly distributed on the surface of the nanosheet, so the preapred porous oxide / titanium dioxide microsphere composite catalytic material has a great specific surface area and good photocatalysis performance.

Description

technical field [0001] The invention relates to a composite catalytic material and a preparation method thereof, in particular to a porous oxide / titanium dioxide microsphere composite catalytic material and a preparation method thereof. Background technique [0002] Since entering the 21st century, my country's economy has developed rapidly, and the resulting environmental pollution has become increasingly severe. Because photocatalysis has the advantages of high efficiency, energy saving and pollution-free, it is considered to be the most potential technology to deal with water pollution, and TiO 2 It has the advantages of non-toxic, stable chemical properties and strong oxidation, and has been widely studied and used for photocatalytic water pollution treatment. However, due to TiO 2 The bandgap width is relatively large (3.2eV), and it can only absorb ultraviolet rays with high energy, so it cannot effectively use sunlight, which limits its practical application. Most ...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/28B01J20/30B01J23/22B01J23/28B01J23/30C02F1/32C02F101/30
CPCB01J20/0214B01J20/0218C02F1/32B01J20/28021B01J23/22B01J23/28B01J23/30C02F2101/308B01J35/51B01J35/39Y02W10/37
Inventor 冯培忠刘洋康学勤牛继南刘章生凌意瀚
Owner CHINA UNIV OF MINING & TECH
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