Preparation method of diatomite-loaded nitrogen-doped nanometer TiO2 photocatalysis material

A technology of photocatalytic materials and diatomite, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low utilization rate of natural light in photocatalysts, and achieve the effect of improving photocatalytic performance

Active Publication Date: 2012-10-03
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Application Information

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Problems solved by technology

[0004] The second is pure nano TiO 2 The utilization rate of natural light of photocatalyst is not high
However, most of the research so far has focused on pure nano-TiO 2 Nitrogen doping research on photocatalysts, no diatomaceous earth-supported nano-TiO 2 Report on Nitrogen Doping of Photocatalytic Materials

Method used

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  • Preparation method of diatomite-loaded nitrogen-doped nanometer TiO2 photocatalysis material
  • Preparation method of diatomite-loaded nitrogen-doped nanometer TiO2 photocatalysis material

Examples

Experimental program
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Embodiment 1

[0022] Take 100g of dry diatomite with a diatom content of 84.68% and 3000ml of deionized water to remove the 325-mesh sieve residue and add 100g of deionized water to the laboratory reactor to stir and make slurry, add hydrochloric acid to adjust the pH value of the slurry to 2; A good mass concentration is 200ml of 50% titanium tetrachloride aqueous solution and 150ml of ammonium chloride aqueous solution with a concentration of 200g / L; 30% concentrated ammonia and deionized water are made into an ammonia solution with a volume ratio of 1: 2.0 and added dropwise into the slurry at a rate of 2.4ml / min; stop the dropwise addition when the pH value of the system is 9.0; react at a temperature of 70°C for 2.0h and then filter and wash with water; the washed filter cake is dried at 105°C and beaten After dispersing, heat-preserve and calcinate at 600°C for 2 hours in a laboratory rotary tube furnace under the condition of nitrogen gas.

Embodiment 2

[0024] Take 100g of beneficiation diatom concentrate with a diatom content of 88.39%, add 3000ml of deionized water into a laboratory reactor and stir to make slurry, add hydrochloric acid to adjust the pH value of the slurry to 2; 200ml of titanium tetrachloride aqueous solution and 150ml of ammonium chloride aqueous solution with a concentration of 200g / L; 30% concentrated ammonia water and deionized water are made into an ammonia solution with a volume ratio of 1: 2.0 and added dropwise to the slurry at a rate of 2.4 ml / min; stop dropping when the pH value of the system is 9.0; react at a temperature of 70°C for 2.0h and then filter and wash with water; the washed filter cake is dried and dispersed at 105°C and then rotated in the laboratory Calcination at 600°C for 2 hours under the condition of nitrogen in the furnace.

Embodiment 3

[0026] Take 100g of calcined diatomite with a diatom content of 90.79%, add 3000ml of deionized water into a laboratory reactor and stir to make slurry, add hydrochloric acid to adjust the pH value of the slurry to 2; Titanium chloride aqueous solution 200ml and concentration are 150ml of ammonium chloride aqueous solution of 200g / L; 30% concentrated ammonia water and deionized water are made into the ammonia solution that volume ratio is 1: 2.0 and add dropwise in the slurry, the rate of addition is 2.4ml / min; stop dropping when the pH value of the system is 9.0; react at a temperature of 70°C for 2.0h and then filter and wash with water; the washed filter cake is dried at 105°C and dispersed in a laboratory rotary tube furnace Calcination at 600°C for 2 hours under the condition of medium nitrogen flow.

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Abstract

The invention relates to a preparation method of a diatomite-loaded N-doped nanometer TiO2 photocatalysis material, which belongs to the technical fields of mineral materials and photocatalysis. The method comprises the following steps of: adding water and concentrated hydrochloric acid into diatomite mineral powder, stirring, pulping, and adding a TiCl4 aqueous solution and an NH4Cl aqueous solution, adding an ammonia aqueous solution for adjusting the pH value of a reaction liquid, and performing a hydrolytic precipitation loading and liquid phase N doping reaction on NH<4+> serving as a nitrogen source; and filtering a reaction product, washing, drying, and calcining and crystalizing in a nitrogen atmosphere to obtain the diatomite-loaded N-doped nanometer TiO2 photocatalysis material. According to the diatomite-loaded N-doped nanometer TiO2 photocatalysis material prepared with the method disclosed by the invention, the photocatalysis performance of nanometer TiO2 under visible light can be improved remarkably, a continuous degradation function on formaldehyde is realized, and the degradation rate of formaldehyde is over 86 percent within 24 hours under the condition of visible light.

Description

technical field [0001] The invention relates to a kind of N-doped nano-TiO with diatomaceous earth as a carrier 2 The invention discloses a method for preparing a photocatalytic material, belonging to the technical field of mineral materials and photocatalysis. technical background [0002] Since the 1970s, nano-TiO 2 It has been proved to be a photocatalytic material with high efficiency, non-toxicity and stable performance. But there are two problems in actual use. [0003] One is pure nano TiO 2 Poor dispersibility and difficult to recycle and reuse. Loading it on a carrier material that is easy to recycle is one of the main ways to solve its dispersibility and reusability. Currently researched nano-TiO 2 The carrier materials mainly include activated carbon, molecular sieve, zeolite, bentonite, protein clay, glass, ceramics, diatomaceous earth, white carbon black, attapulgite and so on. Diatomaceous earth is a kind of natural porous non-metallic mineral mainly com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24A62D3/17A62D101/28
Inventor 郑水林孙志明胡志波
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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