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Preparation method and application of carbon mesh-coated mesoporous wo3/tio2 composite microspheres

A composite microsphere and mesoporous technology, used in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of long preparation period, high temperature, complicated operation, etc., and achieve short preparation period and large specific surface area. , the effect of simple preparation process

Active Publication Date: 2019-09-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a high temperature and relatively complicated operation, and the obtained titanium oxide has a rutile structure when the temperature is above 600°C, and the preparation period is relatively long.
However, the continuous preparation of carbon mesh-coated mesoporous WO with visible light catalytic activity by spray drying method 3 / TiO 2 The method of composite microsphere photocatalyst has not been reported yet

Method used

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  • Preparation method and application of carbon mesh-coated mesoporous wo3/tio2 composite microspheres
  • Preparation method and application of carbon mesh-coated mesoporous wo3/tio2 composite microspheres
  • Preparation method and application of carbon mesh-coated mesoporous wo3/tio2 composite microspheres

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Accurately weigh 5.000g titanyl sulfate, 0.315g ammonium metatungstate, and 1.000g glucose (the ratio of titanyl sulfate as titanium, ammonium metatungstate as tungsten and glucose as carbon is 1 : 0.05:1.75), 2.160g of citric acid in a 2L beaker, add 1600mL of deionized water, and magnetically stir at room temperature for 12h until the material is completely dissolved in water and becomes a colorless transparent solution. Then adjust the pH of the solution to 7.5 with 2.7wt% dilute ammonia water to obtain a precursor solution.

[0035] (2) The precursor solution obtained in step (1) was spray-dried, the inlet temperature of the spray dryer was set to 200°C, the material flow rate was 800mL / h, and the air pressure was 0.35MPa to obtain a brownish-yellow precursor powder.

[0036](3) Spread the brown-yellow precursor powder obtained in step (2) on the middle 1 / 3 of the quartz boat, put the quartz boat into the tube furnace, and place it directly under the middle temp...

Embodiment 2

[0039] (1) With embodiment 1 step (1).

[0040] (2) With embodiment 1 step (2).

[0041] (3) Spread the brown-yellow precursor powder obtained in step (2) on the middle 1 / 3 of the quartz boat, put the quartz boat into the tube furnace, and place it directly under the middle temperature sensor. First pass nitrogen gas for 30 minutes to discharge the air in the tube furnace, the volume flow rate of nitrogen gas is 80mL / min, and then under the protection of nitrogen gas, the temperature of the furnace is raised to 550 °C at a heating rate of 5 °C / min, and the holding time is 3 h. Turn off the heater switch and let it cool down to room temperature naturally. The calcined samples were taken out to obtain carbon mesh-coated mesoporous WO 3 / TiO 2 Novel composite microsphere photocatalyst.

[0042] (4) Weigh 0.100g of the above composite material and add it to 100mL of methylene blue aqueous solution with a concentration of 10mg / L to obtain a suspension, place the suspension in a...

Embodiment 3

[0044] (1) With embodiment 1 step (1).

[0045] (2) With embodiment 1 step (2).

[0046] (3) Spread the brown-yellow precursor powder obtained in step (2) on the middle 1 / 3 of the quartz boat, put the quartz boat into the tube furnace, and place it directly under the middle temperature sensor. First pass nitrogen gas for 30 minutes to discharge the air in the tube furnace, the volume flow rate of nitrogen gas is 80mL / min, and then under the protection of nitrogen gas, the temperature of the furnace is raised to 600 °C at a heating rate of 5 °C / min, and the holding time is 3 h. Turn off the heater switch and let it cool down to room temperature naturally. The calcined samples were taken out to obtain carbon mesh-coated mesoporous WO 3 / TiO 2 Novel composite microsphere photocatalyst.

[0047] (4) Weigh 0.100g of the above composite material and add it to 100mL of methylene blue aqueous solution with a concentration of 10mg / L to obtain a suspension, place the suspension in a...

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Abstract

The invention discloses a carbon mesh-coated mesoporous WO 3 / TiO 2 Preparation method and application of composite microspheres. The preparation method includes the following steps: (1) Dissolve titanium source, tungsten source, carbon source, and complexing agent in deionized water, stir magnetically at 25-35°C for 6-24 hours, and then Use 2.5wt% to 2.8wt% ammonia water to adjust the pH to 7.0 to 8.0 to obtain a precursor solution. The obtained precursor solution is spray-dried to obtain a brown-yellow precursor powder; (2) The precursor prepared in step (1) The bulk powder is heated to 400-800°C under the protection of an inert atmosphere for high-temperature treatment. After high-temperature treatment, it is lowered to room temperature to obtain carbon mesh-coated mesoporous WO. 3 / TiO 2 Composite microspheres. The present invention provides the carbon mesh-coated mesoporous WO 3 / TiO 2 Application of composite microspheres as photocatalysts. The preparation method of the present invention has the advantages of simplicity, good controllability and repeatability, short preparation cycle, and ease of industrial mass production. The prepared composite photocatalyst has a large specific surface area, is fully absorbent in the visible light region, and is resistant to organic pollutants. Good adsorption and degradation performance.

Description

[0001] (1) Technical field [0002] The invention relates to a carbon mesh-coated mesoporous WO 3 / TiO 2 Preparation method of composite microsphere photocatalyst and its application as photocatalyst. [0003] (2) Background technology [0004] Due to TiO 2 With the advantages of strong oxidation ability, high catalytic activity, stable physical properties, low price and non-toxicity, it has become the most deeply researched photocatalytic material in the fields of sewage treatment, air purification, hydrogen production by photolysis of water, and solar cells. However, due to TiO 2 The bandgap width of solar energy is relatively large, and only ultraviolet light with higher energy can stimulate its photocatalytic activity, while ultraviolet light in sunlight only accounts for about 4.5%, resulting in a low utilization rate of sunlight. At the same time, TiO 2 The photogenerated electrons and holes are easy to recombine, which greatly reduces its photocatalytic efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/08B01J13/02B01J35/10C02F1/30C02F1/72C02F101/30
CPCB01J13/02C02F1/30C02F1/725B01J23/30C02F2101/30C02F2305/10B01J35/51B01J35/613B01J35/615B01J35/39Y02W10/37
Inventor 李国华陈佳佳喻洋
Owner ZHEJIANG UNIV OF TECH
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