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Preparation method of supported nano TiO2 photocatalytic material with diatomite filter aid as carrier

A technology of photocatalytic materials and filter aids, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low utilization rate of natural light and poor thermal stability of photocatalysts

Active Publication Date: 2011-05-04
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • 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
Metal ion doping can effectively expand TiO 2 visible light response, but the metal ion doped TiO 2 Poor thermal stability, doped metals tend to become electron-hole recombination centers, some doping methods require expensive ion implantation equipment; non-metal doped TiO 2 Not only has a good response in the visible light region and exhibits strong photocatalytic activity, but this photocatalytic activity is not at the expense of photoactivity under UV excitation, which can overcome the defects of metal ion doping

Method used

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  • Preparation method of supported nano TiO2 photocatalytic material with diatomite filter aid as carrier
  • Preparation method of supported nano TiO2 photocatalytic material with diatomite filter aid as carrier
  • Preparation method of supported nano TiO2 photocatalytic material with diatomite filter aid as carrier

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Experimental program
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Effect test

Embodiment 1

[0026] Take 30kg of diatomite filter aid, add 1500L of water, adjust the pH value to 2 with hydrochloric acid, stir to disperse and cool to 5°C, then add 62L of titanium tetrachloride aqueous solution with a mass concentration of 50% and a concentration of 200g / 150L of ammonium sulfate solution in L; stir the reaction and raise the temperature to 30°C, add ammonium carbonate to adjust the pH value of the reaction solution to 5.0, and then age at 30°C for 1.0h; filter the reaction product and dry it in a flash dryer Calcined at 620-650°C for 4 hours in a continuous rotary furnace to obtain diatomite filter aid-loaded nano-TiO 2 photocatalytic material.

Embodiment 2

[0028] Take 30kg of diatomite filter aid, add 1800L of water, adjust the pH value to 2 with hydrochloric acid, stir to disperse and cool to 4°C, then add 80L of titanium tetrachloride aqueous solution with a mass concentration of 50% and a concentration of 200g / 200L of ammonium sulfate solution in L; stir the reaction and raise the temperature to 30°C, add ammonium carbonate to adjust the pH value of the reaction solution to 4.5, and then age at 30°C for 1.0h; filter the reaction product and dry it in a flash dryer Calcined at 620-650°C for 4 hours in a continuous rotary furnace to obtain diatomite filter aid-loaded nano-TiO 2 photocatalytic material.

Embodiment 3

[0030] Take 60kg of diatomite filter aid, add 1800L of water, adjust the pH value to 2 with hydrochloric acid, stir to disperse and cool to 5°C, then add 124L of titanium tetrachloride aqueous solution with a mass concentration of 50% and a concentration of 200g / 300L of ammonium sulfate solution in L; stir the reaction and raise the temperature to 28°C, add ammonium carbonate to adjust the pH value of the reaction solution to 5.0, and then age at 30°C for 1.0h; filter the reaction product and dry it in a flash dryer Calcined at 620-650°C for 4 hours in a continuous rotary furnace to obtain diatomite filter aid-loaded nano-TiO 2 photocatalytic material.

[0031] Table 1 is the detection result of the product obtained in the embodiment.

[0032] The detection analysis result of table 1 embodiment sample

[0033]

[0034] Note: [1] Add 0.1g composite material sample to 100mL rhodamine B solution with a concentration of 10mg / L;

[0035] [2]1m 3 A petri dish containing 3 μL...

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Abstract

The invention relates to a preparation method of a supported nano TiO2 photocatalysis material with a diatomite filter aid as a carrier. The preparation method comprises the steps of adding water into the diatomite filter aid, stirring the mixture to prepare slurry and adding acid to regulate pH value; then cooling the slurry, then sequentially adding TiCl4 solution and ammonium sulphate for reaction, heating reaction liquid to a certain temperature, then adding ammonium carbonate solution to regulate the pH value of solution and ageing the reaction liquid for a period of time; and finally filtering, washing, drying and calcining the reaction product, thus obtaining the diatomite filter aid supported nano TiO2 photocatalytic material. The supported nano TiO2 photocatalytic material has excellent photocatalytic performance under ultraviolet light and visible light and has more than 80% of degradation removal rate on formaldehyde in 24 hours under a fluorescent lamp.

Description

1. Technical field [0001] The invention relates to a loaded nano-TiO with diatomite filter aid as the carrier 2 The invention discloses a method for preparing photocatalytic materials, belonging to the fields of mineral processing and photocatalytic materials. 2. Background technology [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 Easy to reunite and difficult to recycle. Loading it on a suitable carrier material is one of the main methods to solve its easy agglomeration and difficulty in recycling. Currently researched nano-TiO 2 The carrier materials mainly include activated carbon, molecular sieve, zeolite, bentonite, sepiolite, glass, ceramics, diatomite, etc. Diatomite filter aid is a porous siliceous powder material that uses diatomite as raw material, adds flux, and is calcined at high temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J21/06B01J37/00A62D3/176A62D3/17A62D101/28A62D101/20
Inventor 郑水林王利剑傅振彪许辉张晓波刘杰吕芳丽
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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