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Preparation method of strontium-doped titanium dioxide magnetic nanometer photocatalyst

A titanium dioxide and photocatalyst technology, which is applied in the field of photocatalyst material preparation, can solve the problems of small contact surface area of ​​catalyst, low utilization rate of sunlight, low photocatalytic efficiency, etc., and achieves convenient recycling and reuse, expansion of forbidden band width, and simple process. Effect

Inactive Publication Date: 2014-03-12
江西农人园林开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-TiO 2 In the process of photocatalytic degradation, photocatalyst usually exists in suspended or immobilized form, in suspended TiO 2 Although the powder has a large specific surface area, good effect of being exposed to light, and high photocatalytic efficiency, there is a problem of difficulty in recycling. Scientists at home and abroad have tried various immobilization methods, but the problem that follows is that the contact surface area of ​​the catalyst is relatively small. Small, the photocatalytic efficiency is significantly lower than that of the suspension system
In addition, TiO 2 The bandgap width of the anatase phase of the photocatalyst is 3.2eV, and the absorption threshold is about 387nm. The ultraviolet light absorbed by it only accounts for about 4% of sunlight, and the utilization rate of sunlight is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for preparing a strontium-doped titanium dioxide magnetic nano photocatalyst, the specific steps are as follows:

[0014] (1) Ni 0.6 Zn 0.4 Fe 2 o 4 The preparation method of the magnetic matrix:

[0015] According to the atomic molar ratio Fe:Ni:Zn=5:1.5:1, weigh 0.015mol of Ni(NO 3 ) 2 ·6H 2 O, 0.01mol of Zn(NO 3 ) 2 ·6H 2 O and 0.05mol Fe(NO 3 ) 3 9H 2 Dissolve O in a beaker with 50ml of deionized water, add 50g of citric acid, adjust the pH to 6.8 with ammonia water, stir for 5 minutes, transfer the mixture to a 68°C water bath for ultrasonic oscillation until a brown-red transparent sol appears, and transfer to a dry Dry in the oven at 130°C for 12 hours to form a xerogel, and place the prepared xerogel in the air to ignite, that is, self-propagating combustion occurs to form a loose tan powder Ni 0.6 Zn 0.4 Fe 2 o 4 ;

[0016] (2) Strontium-doped titanium dioxide coated Ni 0.6 Zn 0.4 Fe 2 o 4 Preparation method of magnetic photocataly...

Embodiment 2

[0019] A method for preparing a strontium-doped titanium dioxide magnetic nano photocatalyst, the specific steps are as follows:

[0020] (1) Ni 0.6 Zn 0.4 Fe 2 o 4 The preparation method of the magnetic matrix:

[0021] According to the atomic molar ratio Fe:Ni:Zn=5:1.5:1, weigh 0.015mol of Ni(NO 3 ) 2 ·6H 2 O, 0.01mol of Zn(NO 3 ) 2 ·6H 2 O and 0.05mol Fe(NO 3 ) 3 9H 2 Dissolve O in a beaker with 50ml of deionized water, add 50g of citric acid, adjust the pH to 6.9 with ammonia water, stir for 5 minutes, transfer the mixture to a 70°C water bath for ultrasonic oscillation until a brown-red transparent sol appears, and transfer to a dry Dry in the oven at 140°C for 12 hours to form a xerogel, and ignite the xerogel in the air, that is, self-propagating combustion occurs to form a loose brown powder Ni 0.6 Zn 0.4 Fe 2 o 4 ;

[0022] (2) Strontium-doped titanium dioxide coated Ni 0.6 Zn 0.4 Fe 2 o 4 Preparation method of magnetic photocatalyst:

[0023] At...

Embodiment 3

[0025] A method for preparing a strontium-doped titanium dioxide magnetic nano photocatalyst, the specific steps are as follows:

[0026] (1) Ni 0.6 Zn 0.4 Fe 2 o4 The preparation method of the magnetic matrix:

[0027] According to the atomic molar ratio Fe:Ni:Zn=5:1.5:1, weigh 0.015mol of Ni(NO 3 ) 2 ·6H 2 O, 0.01mol of Zn(NO 3 ) 2 ·6H 2 O and 0.05mol Fe(NO 3 ) 3 9H 2 O was dissolved in a beaker with 50ml of deionized water, then 50g of citric acid was added, adjusted to PH = 6.9 with ammonia water, stirred for 5 minutes, the mixture was transferred to a 69°C water bath for ultrasonic oscillation until a brown-red transparent sol appeared, and transferred to a dry Dry in the oven at 135°C for 12 hours to form a xerogel, and ignite the prepared xerogel in the air, that is, self-propagating combustion occurs to form a loose brown powder Ni 0.6 Zn 0.4 Fe 2 o 4 ;

[0028] (2) Strontium-doped titanium dioxide coated Ni 0.6 Zn 0.4 Fe 2 o 4 Preparation method of...

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Abstract

The invention discloses a preparation method of a strontium-doped titanium dioxide magnetic nanometer photocatalyst. The preparation method comprises the following steps: using Ni-Zn-Fe nitrate as a raw material, synthesizing an Ni0.6Zn0.4Fe2O4 magnetic substrate by adopting a self-propagating combustion method, using strontium as a dopant, using titanium tetrabutoxide as a titanium source, covering the Ni0.6Zn0.4Fe2O4 magnetic substrate, and finally, carrying out calcinations processing at a high temperature of 550 DEG C to obtain the strontium-doped titanium dioxide magnetic nanometer photocatalyst. The prepared strontium-doped titanium dioxide magnetic nanometer photocatalyst has the characteristics of high pollutant treatment efficiency and easiness to recover, has a potential application value in the aspect of treating pollutant effluents through large-scale application of titanium dioxide and has certain scientific research significance in further exploring the influence generated after the alkali metal is doped in titanium dioxide.

Description

technical field [0001] The invention relates to a preparation method of a strontium-doped titanium dioxide magnetic nanometer photocatalyst, belonging to the field of photocatalyst material preparation. Background technique [0002] Nano-TiO 2 Due to its unique quantum effect, size effect, surface effect, high chemical stability and good photocatalytic activity, it has become a research hotspot of photocatalyst. Nano-TiO 2 In the process of photocatalytic degradation, photocatalyst usually exists in suspended or immobilized form, in suspended TiO 2 Although the powder has a large specific surface area, good effect of being exposed to light, and high photocatalytic efficiency, there is a problem of difficulty in recycling. Scientists and scientists at home and abroad have tried various immobilization methods, but the ensuing problem is that the contact surface area of ​​the catalyst is relatively small. Small, the photocatalytic efficiency is significantly lower than that ...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J35/00
Inventor 谢宇刘福明乐长高汪月华李明俊彭思伟潘建飞
Owner 江西农人园林开发有限公司
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