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Nanometer ferric oxide/nanometer titanium dioxide composite photocatalyst, and preparation method thereof

A technology of nano-ferric oxide and nano-titanium dioxide, which is applied in the field of preparation of nano-ferric oxide/titanium dioxide composite photocatalysts, can solve problems such as easy recombination, failure to meet expected requirements, and reduced photocatalytic performance. Effect of electron-hole recombination rate, high activity, and visible light catalytic activity improvement

Inactive Publication Date: 2019-11-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, iron nitrate nonahydrate, citric acid and commercially available P25 titanium dioxide are used as raw materials, and NaCl is used as a diluent, and a salt-assisted solution combustion method is used to synthesize nanometer ferric oxide / titanium dioxide composite photocatalyst.
[0003] Titanium dioxide is an n-type wide bandgap semiconductor photocatalytic material, which has the advantages of high stability, nanostructure, and high catalytic performance. However, the band gap of titanium dioxide is relatively large (3.2eV), and it can only absorb light below 387 nm, and Photogenerated electron-hole pairs are prone to recombination, which reduces the photocatalytic performance of the material and cannot meet the expected requirements.

Method used

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  • Nanometer ferric oxide/nanometer titanium dioxide composite photocatalyst, and preparation method thereof
  • Nanometer ferric oxide/nanometer titanium dioxide composite photocatalyst, and preparation method thereof
  • Nanometer ferric oxide/nanometer titanium dioxide composite photocatalyst, and preparation method thereof

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preparation example Construction

[0016] The preparation method of nano ferric oxide / nano titanium dioxide composite photocatalyst, its step is:

[0017] (1) Dissolve 0.2g-1.80g of ferric nitrate nonahydrate in distilled water, then add 0.10g-0.80g of citric acid and sodium chloride into the solution of ferric nitrate nonahydrate, and stir to obtain a uniform solution;

[0018] (2) Add titanium dioxide powder to prepare a suspension, transfer it to a tube furnace for combustion, and after the reaction is completed, the reaction kettle is naturally cooled to room temperature and washed repeatedly;

[0019] (3) After washing, place the sample in a vacuum drying oven at a temperature of 60°C for 2 hours to dry the sample.

[0020] In the preparation method of the nanometer ferric oxide / nanotitanium dioxide composite photocatalyst mentioned above, the stirring adopts magnetic stirring for 30 minutes.

[0021] The above-mentioned preparation method of nano-ferric oxide / nano-titanium dioxide composite photocatalyst...

Embodiment 1

[0029] Embodiment 1: Preparation of nano-ferric oxide / nano-titanium dioxide photocatalyst:

[0030] (1) According to 0.1% Fe 3+ :1Ti 4+ The molar ratio of Fe(NO 3 ) 3 .9H 2 O and TiO 2 , then take a certain amount of citric acid and sodium chloride according to the chemical reaction equation;

[0031] (2) Mix the above reactants evenly in a mortar and grind them;

[0032] (3) Transfer to a beaker and add a small amount of distilled water, and ultrasonically disperse until uniform;

[0033] (4) Transfer the above sample to a quartz crucible and burn it in a tube furnace at 700°C for 2 hours;

[0034] (5) After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and then the sample is taken out, and washed with water and alcohol repeatedly;

[0035] Table 1. Energy Spectrum Data Sheet:

[0036] element wt% wt% Sigma atomic percentage C 3.52 0.53 6.57 O 51.81 0.87 72.55 Ti 44.56 0.81 20.84 Fe...

Embodiment 2

[0038] Embodiment 2: The preparation method of nano-ferric oxide / nano-titanium dioxide photocatalyst:

[0039] (1) According to 0.1% Fe 3+ :1Ti 4+ The molar ratio of Fe(NO 3 ) 3 .9H 2 O and P25TiO 2 , then take a certain amount of citric acid and sodium chloride according to the chemical reaction equation;

[0040] (2) Mix the above reactants evenly in a mortar and grind them;

[0041] (3) Transfer to a beaker and add a small amount of distilled water, and ultrasonically disperse until uniform;

[0042] (4) Transfer the above sample to a quartz crucible and burn it in a tube furnace at 500°C for 2 hours;

[0043] (5) After the reaction is completed, the reactor is naturally cooled to room temperature, and then the samples are taken out, and washed with water and alcohol repeatedly.

[0044] The EDS and SEM characterizations of the samples showed that the nanometer ferric oxide / titanium dioxide was successfully matched, and the prepared photocatalyst was used to degrad...

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Abstract

The invention discloses a nanometer ferric oxide / nanometer titanium dioxide composite photocatalyst, and a preparation method thereof, and belongs to the field of photocatalysis environment restoration. The nanometer ferric oxide / nanometer titanium dioxide composite photocatalyst is composed through loading of the surfaces of titanium dioxide nanometer spheres with ferric oxide nanometer spheres.The preparation method comprises following steps: 1, 0.2 to 1.80g of iron nitrate nonahydrateis dissolved in distilled water, 0.10 to 0.80g of citric acid and a certain amount of sodium chloride are added into an obtained iron nitrate nonahydrate solution; 2, stirring is carried out to obtain a uniform solution; 3, commercially available P25 titanium dioxide powder is added in an obtained solution, and ultrasonic dispersion is carried out to prepare a suspension solution; 4, the suspension solution is introduced into a tubular furnace for combustion, after reaction, the reaction vessel to cooled to room temperature through natural cooling, and repeat washing is carried out; and 5, after washing, an obtained sample is placed in a vacuum drying box for 2h of drying at 60 DEG C.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to the preparation technology of nanometer ferric oxide / titanium dioxide composite photocatalyst. Background technique [0002] In recent years, many semiconductor metal oxide photocatalysts have been discovered, and they show good photocatalytic activity under sunlight irradiation. The most common ones are nano-titanium dioxide and nano-ferric oxide. However, single titanium dioxide only responds to ultraviolet light, while single nanometer ferric oxide has low catalytic activity under visible light irradiation. Therefore, compounding titanium dioxide materials to improve the photocatalytic performance of materials has become a research hotspot in recent years and in the future. Composite nano ferric oxide / titanium dioxide photocatalyst has the characteristics of high activity under visible light, simple process, low price and environmental friendliness. It is a composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/30C02F101/38
CPCB01J23/745C02F1/30C02F2101/38C02F2305/10B01J35/39
Inventor 欧玉静赵丹李春雷郑毅邵怡亮
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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