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Preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth

A rare earth doping and photocatalyst technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, botanical equipment and methods, etc., can solve the problems of sunlight utilization limitation and photocatalytic reaction rate limitation, and achieve simple molding process , Excellent photocatalytic performance and stability, and the effect of improving photodegradation efficiency

Inactive Publication Date: 2015-11-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Second, due to TiO 2 The band gap is wide and can only be activated by ultraviolet light below 380nm, which greatly limits the use of sunlight; moreover, the high recombination rate of photogenerated electrons and holes also limits its photocatalytic reaction rate

Method used

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  • Preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: First, weigh 20 g of diatomite, add 100 g of sulfuric acid with a mass fraction of 60%, pickle at 65°C for 95 minutes, filter with suction, dry and then calcinate at 500°C for 5 hours. Then take by weighing 10g of pretreated diatomite, add 0.3g dextrin, 0.2g hydroxypropyl methylcellulose, 0.4g sodium carbonate, 13ml deionized water, and use a multifunctional pelletizing machine to make diatomite Spherical, dry at 80°C for 4h, and calcined at 800°C for 2h. Finally, the titanium dioxide sol was prepared by sol-gel method; the spherical diatomite was put into the sol, soaked for 3 hours, dried, and calcined at 600°C for 2 hours to obtain the supported photocatalyst.

Embodiment 2

[0022] Example 2: First, weigh 20 g of diatomite, add 120 g of sulfuric acid with a mass fraction of 40%, pickle at 50°C for 75 minutes, filter with suction, dry and then calcinate at 600°C for 4 hours. Then weigh 10 g of pretreated diatomite, add 0.5 g of dextrin, 0.1 g of sodium carbonate, and 12 ml of deionized water, and use a multifunctional pellet machine to make the diatomite into a spherical shape, and dry it at 70 ° C for 6 hours. Calcined at 900°C for 2h. Finally, the rare earth cerium-doped titania sol was prepared by the sol-gel method, in which the doping amount of cerium was 0.5%; the spherical diatomite was put into the sol, dried for 2 hours after immersion, and calcined at 600 °C for 1.5 hours. A supported composite photocatalyst was obtained.

Embodiment 3

[0023] Example 3: First, weigh 20 g of diatomite, add 140 g of sulfuric acid with a mass fraction of 10%, pickle at 80°C for 30 minutes, filter with suction, dry and then calcinate at 300°C for 6 hours. Then take by weighing the diatomite after 10g pretreatment, add 0.3g hydroxypropyl methyl cellulose, 0.2g sodium carbonate, 11ml deionized water, adopt multi-function pelletizing machine to make diatomite spherical, at 60 Dry at ℃ for 12h, and calcined at 700℃ for 4h. Finally, the rare earth cerium-doped titania sol was prepared by sol-gel method, in which the doping amount of cerium was 0.3%; the spherical diatomite was put into the sol, dried for 5 hours after immersion, and calcined at 700°C for 1 hour to obtain Supported composite photocatalyst.

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Abstract

The invention relates to a preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth, and belongs to the technical field of photocatalysis. The preparation method comprises the steps of: pickling original diatomite, roasting the pickled diatomite, and uniformly mixing the roasted diatomite, a binder, a fluxing agent and the like so as to obtain molded diatomite; and using tetrabutyl orthotitanate and dehydrated alcohol as raw materials, preparing TiO2 and rare earth doped TiO2 sol by a sol-gel method, macerating the preformed diatomite in the sol, drying the macerated diatomite, and calcining the dried diatomite so as to obtain the load type photocatalyst. The photocatalyst can prevent the TiO2 from running off; besides, the rare earth is doped, so that the utilization rate of visible light by the TiO2 is increased; when a mercury-vapor lamp is used for 3 hours, 95% of a rhodamine b solution can be degraded; when the photocatalyst is illuminated for an hour under sunlight, escherichia coli can be thoroughly killed; when the photocatalyst is illuminated for 24 hours by common daylight lamps, 92% of methanal can be degraded; the photocatalyst is excellent in photocatalytic property and stability, which indicates that the photocatalyst has favorable application prospects in the respects of waste water treatment, sanitation and sterilization, air purification and the like.

Description

technical field [0001] The invention relates to loading TiO after preforming diatomite 2 and rare earth doped TiO 2 The invention discloses a method for preparing a photocatalyst, belonging to the technical field of mineral materials and photocatalysis. Background technique [0002] Photocatalytic technology has shown great application potential in sewage treatment, cleaning and sterilization, air purification, etc. TiO 2 As a photocatalytic material, it has attracted widespread attention due to its advantages such as good chemical stability, strong oxidation ability, non-toxicity, corrosion resistance, and cheap availability. However, TiO 2 There are two limitations in practical application. [0003] One is due to TiO 2 The particle size is small, easy to agglomerate, and it is difficult to recycle and reuse after photocatalytic reaction, thus affecting its industrialization. In order to make full use of TiO 2 The photocatalytic performance of TiO needs to be 2 fixe...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J37/00C02F1/30B01D53/86A01N59/16A01P1/00
Inventor 刘奎仁于晓娟韩庆陈建设
Owner NORTHEASTERN UNIV
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