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Phosphorus doped with titania photocatalyst with high thermal stability and preparing method thereof

A technology of photocatalyst and titanium oxide, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve high activity, low price, and large specific surface area

Inactive Publication Date: 2008-07-23
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no literature reports on titanium oxide photocatalysts and synthesis methods that maintain high photocatalytic activity under ultraviolet light and visible light, and have excellent thermal stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1, phosphorus-doped titanium oxide photocatalyst and its effect verification

[0026] 1. Preparation of phosphorus-doped titanium oxide photocatalyst

[0027] Add 0.16 mL of 5 mol / L H 3 PO 4 solution, add dropwise 20mL TiCl under electromagnetic stirring 4 (0.18 mol). After adding and continuing to stir for 2 hours, start to add concentrated ammonia water (15mol / L) dropwise until the pH value of the solution is 6.0, age at 50°C for 1 day, filter with suction, and wash with deionized water several times until the filtrate is deionized with 0.1 mol / L AgNO 3 The solution did not detect Cl - ion. Dry the filtrate after washing in an oven at 80°C, take it out and grind it, and roast the obtained powder in a muffle furnace at 800°C for 2 hours to obtain phosphorus-doped titanium oxide.

[0028] As above, replace the H with deionized water 3 PO 4 solution to prepare pure titanium oxide.

[0029] The XRD spectrum of the phosphorus-doped titanium oxide prepared...

Embodiment 2

[0034] Example 2. Phosphorus-doped titanium oxide photocatalyst and its effect verification

[0035] 1. Preparation of Phosphorus-Doped Titanium Oxide Photocatalyst

[0036] Add 0.15 mL of 5 mol / L H to 250 mL of deionized water in an ice-water bath at 2°C 3 PO 4 solution, 20mL TiCl was added dropwise under electromagnetic stirring 4 (0.18 mol). After adding and stirring for 2 hours, start to add 4mol / L NaOH solution dropwise until the pH value of the solution is 5.8, age at 50°C for 1 day, filter with suction, and wash with deionized water several times until the washing solution is 0.1mol / L AgNO 3 No Cl detected in the solution - ion. The washed solid was dried in a 90°C oven, taken out and ground, and the obtained powder was calcined in a 800°C muffle furnace for 4 hours to obtain phosphorus-doped titanium oxide.

[0037] The XRD spectrum shows that the phosphorus-doped titanium oxide obtained above is a pure anatase crystal form with a grain size of 28.9 nm; N 2 The...

Embodiment 3

[0041] Example 3. Phosphorus-doped titanium oxide photocatalyst and its effect verification

[0042] 1. Preparation of Phosphorus-Doped Titanium Oxide Photocatalyst

[0043] Add 0.15 mL of 5 mol / L H to 250 mL of deionized water in an ice-water bath at 5 °C 3 PO 3 solution, 20 mL of 20% TiCl was added dropwise under magnetic stirring 3 solution (0.024 mol). After adding and stirring for 2 hours, start to add 6mol / L NH dropwise 4 HCO 3 The solution was aged until the pH value of the solution was 7.0, aged at room temperature for 1 day, filtered with suction, and washed with deionized water several times until 0.1 mol / L AgNO was used. 3 No Cl detected in the solution - ion. After drying in an oven at 90°C, the powder was taken out and ground, and the obtained powder was calcined in a muffle furnace at 900°C for 1 hour to obtain phosphorus-doped titanium oxide. The XRD pattern shows that it is pure anatase crystal form.

[0044] 2. Effect verification of phosphorus-doped ...

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Abstract

The invention discloses a Phosphor / TiO2 photocatalyst which has high thermal stability and the corresponding preparation method. The photocatalyst can be prepared though a method comprising the following steps: 1) a solution which contains the precursor of inorganic titanium salt and phosphorated compound is prepared, then a precipitant is added into the solution which contains the precursor of inorganic titanium salt and phosphorated compound until the pH value reaches to 4-8, and a solid is obtained by aging and filtering; 2) the solid obtained form the step 1) is dried and calcined to get the phosphor / TiO2 photocatalyst; the precursor of inorganic titanium salt is the random combination of one or more of TiCl4, TiCl 3, TiOCl 2, Ti(SO4)2 and TiOSO4; the phosphorated compound is phosphorated oxy acid and / or phosphorated oxysalt. The photocatalyst of the invention has no polymorphic transformation after being calcined under high temperature, maintains high photocatalitic activity under ultraviolet and visible light, and can be used in the degeneration of the pollutant in industrial effluent and the reparation of wall paint or wall brick paint film which have antibiotic and air purifying effects.

Description

technical field [0001] The invention relates to a phosphorus-doped titanium oxide photocatalyst with high thermal stability and a preparation method thereof. Background technique [0002] TiO 2 As a cheap, non-toxic, highly chemically stable and light-resistant semiconductor material, it is widely used in photocatalysis, photovoltaic power generation and solar cells and other fields. Its two different crystal structures, anatase and rutile, are commonly used in the field of photocatalysis. Among them, anatase TiO 2 Due to its high photocatalytic activity and strong oxidation ability of photogenerated holes, it has attracted extensive attention. But anatase TiO 2 The forbidden band width of solar energy is 3.2ev, so it can only absorb ultraviolet light with a wavelength of less than 400nm; ultraviolet light only accounts for 3 to 4% of the solar energy spectrum, and visible light, which accounts for nearly half of the solar energy, cannot be utilized. Therefore, extendin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J27/18B01J37/28
Inventor 朱月香郑仁垟郭颖金辰谢有畅
Owner PEKING UNIV
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