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A kind of preparation method of diatomite loaded nitrogen-doped nano-tio2 photocatalytic material

A technology of photocatalytic material and diatomaceous earth, applied in the direction of protection device against harmful chemical agents, etc., can solve the problem of low utilization rate of natural light of photocatalyst, and achieve the effect of improving photocatalytic performance

Active Publication Date: 2015-10-21
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of preparation method of diatomite loaded nitrogen-doped nano-tio2 photocatalytic material
  • A kind of preparation method of diatomite loaded nitrogen-doped nano-tio2 photocatalytic material

Examples

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Effect test

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; 200ml of titanium tetrachloride aqueous solution with a mass concentration of 50% and 150ml of ammonium chloride aqueous solution with a concentration of 200g / L; make 30% concentrated ammonia water and deionized water into an ammonia solution with a volume ratio of 1:2.0 and add 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; make 30% concentrated ammonia water and deionized water into an ammonia solution with a volume ratio of 1:2.0 and add it 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; 200ml of titanium chloride aqueous solution and 150ml of ammonium chloride aqueous solution with a concentration of 200g / L; make 30% concentrated ammonia water and deionized water into an ammonia solution with a volume ratio of 1:2.0 and add it dropwise to the slurry at a rate of 2.4ml / min; when the pH value of the system is 9.0, stop the dropwise addition; 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 Patents(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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