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Preparation and using method of Ag@AgI/AgBr modified TiO2 nanometer tube photochemical catalyst

A photocatalyst and nanotube technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem that catalysts need to be further improved, and achieve excellent stability and visible light response performance, tubular structure. Complete, photocatalytic activity-enhancing effect

Inactive Publication Date: 2012-07-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modified TiO 2 Its photocatalytic activity has been improved, but the activity and service life of the catalyst need to be further improved. If TiO with a large specific surface area 2 Nanotube modification will further improve photocatalytic performance

Method used

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  • Preparation and using method of Ag@AgI/AgBr modified TiO2 nanometer tube photochemical catalyst
  • Preparation and using method of Ag@AgI/AgBr modified TiO2 nanometer tube photochemical catalyst
  • Preparation and using method of Ag@AgI/AgBr modified TiO2 nanometer tube photochemical catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step (1): First weigh 1 g of P25 nano-TiO 2 Dispersed in 80 mL, 10 mol / dm 3 Magnetically stirred in NaOH solution for 0.5 h, then placed in a stainless steel hydrothermal kettle lined with polytetrafluoroethylene, and reacted at a constant temperature in an oven at 110 °C for 24 h; took out the hydrothermal kettle, cooled to room temperature, filtered and rinsed with deionized water Wash to pH = 7.0, then precipitate at 0.1 mol / dm 3 HNO 3 The solution was magnetically stirred overnight, then washed with deionized water until neutral, and finally dried at 60 °C for 24 h, and raised to 500 °C in a muffle furnace at a rate of 2 °C / min, kept for 2 h, and cooled to room temperature , to obtain TiO after calcination 2 nanotubes (TNTs).

[0025] Step (2): Weigh 0.64 g of TNTs prepared in step (1) and disperse in 100 mL of distilled water, ultrasonically disperse for 30 min, and then add 8 ml, 0.1 mol / dm 3 AgNO 3 The solution was magnetically stirred for 30 min. Add 8 m...

Embodiment 2

[0028] Synthesize TNTs according to step (1) in Example 1, weigh 0.64 g of the prepared TNTs and disperse them in 100 mL of distilled water, ultrasonically disperse for 30 min, and then add dropwise 8 ml of 0.1 mol / dm 3 AgNO 3 The solution was magnetically stirred for 30 min. Add 8ml, 0.1mol / dm 3 The KBr solution was slowly added dropwise to the above system, and stirring was continued for 3 h after the dropwise addition was completed. Then 0.08 ml of 0.1 mol / dm was added dropwise 3 The aqueous solution of KI, makes AgI add-on amount be 1% of AgBr add-on amount, stir overnight after completion of dropwise addition. Suction filtration, washing with water three times, drying at 80 °C for 12 h, and irradiating for 7 min under a 500 W tungsten-halogen lamp gave the AgAgI / AgBr / TNTs composite photocatalyst.

[0029] According to the method of step (3) in Example 1, after the 500 W tungsten halogen light was illuminated for 60 min, the degradation rate of the catalyst to the meth...

Embodiment 3

[0031] Synthesize TNTs according to step (1) in Example 1, weigh 0.64 g of the prepared TNTs and disperse them in 100 mL of distilled water, ultrasonically disperse for 30 min, and then add dropwise 8 ml of 0.1 mol / dm 3 AgNO 3 The solution was magnetically stirred for 30 min. Then add 8ml, 0.1mol / dm 3 The KBr solution was slowly added dropwise to the above system, and stirring was continued for 3 h after the dropwise addition was completed. Then add 0.2 ml dropwise, 0.1 mol / dm 3 The aqueous solution of KI, makes AgI add-on amount be 2.5% of AgBr add-on amount, stir overnight after finishing dropwise. Suction filtration, washing with water three times, drying at 100 °C for 12 h, and irradiating for 7 min under a 500 W tungsten-halogen lamp gave the AgAgI / AgBr / TNTs composite photocatalyst.

[0032] According to the method of step (3) in Example 1, after 60 min of 500 W tungsten light irradiation, the degradation rate of the catalyst to the methyl orange solution was 55.6% (s...

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Abstract

The invention discloses a preparation and using method of Ag@AgI / AgBr modified TiO2 nanometer tube photochemical catalyst, which includes: dispersing TiO2 nanometer tubes in distilled water, adding 0.1mol / dm3 AgNO3 solution dropwise, and stirring for more than 30 minutes in magnetic mode; adding 0.1mol / dm3 KBr solution dropwise, stirring for more than 3 hours continuously, adding 0.1mol / dm3 KI solution, and controlling adding quantity of the AgI to be 1%-15% of that of the AgBr; finally leaching and washing repeatedly, drying for more than 12 hours at temperature of 60 DEG C to 100 DEG C, and obtaining a TiO2 nanometer tube under irradiating of a 500-watt halogen tungsten lamp; weighing 0.01-0.3g TiO2 nanometer tube photochemical catalyst, adding the catalyst into 150ml of methyl orange solution with concentration ranging from 10mg / L to 30mg / L, and dispersing in ultrasonic mode for 30 minutes; adding the catalyst into a photo-catalyst reactor, turning on a 500-watt tungsten lamp for irradiating, and separating in centrifugal mode. The AgBr and the AgI are loaded on the TiO2 nanometer tubes uniformly by using an in-situ growth method, and the catalyst has high degradation degree on the methyl orange solution, can be reused, and has the advantages of being excellent in stability and visible light response performance and the like.

Description

technical field [0001] The invention relates to a synthesis technology of a photocatalyst, specifically refers to the preparation of AgI / AgBr modified TiO by an in-situ growth method using AgI / AgBr as a silver source 2 nanotubes, and prepared AgAgI / AgBr / TiO by photochemical reaction 2 Nanotube composite photocatalysts. A novel photocatalyst was used to degrade the simulated pollutant methyl orange solution. Background technique [0002] irradiated TiO 2 Photocatalysts have been widely used in air purification, wastewater treatment, oil pollution treatment and other fields, especially the use of TiO 2 The research on photocatalytic degradation of organic pollutants has become one of the research hotspots in the field of photocatalysis. But TiO 2 The band gap (about 3.2 eV) determines that it cannot effectively apply solar energy, and can only use (near) ultraviolet light, which accounts for 4% of sunlight, to stimulate the reaction, and the quantum efficiency is low. Ra...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J35/02A62D3/176A62D101/26
Inventor 赵谦丁海辉傅小奇王倩姜廷顺
Owner JIANGSU UNIV
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