Silver phosphate-titanium dioxide/potassium salt tetratitanate compound and preparation method thereof and application

A technology of titanium dioxide and potassium tetratitanate, which is applied in the fields of chemical instruments and methods, chemical/physical processes, special compound water treatment, etc., can solve the problem of low solar energy utilization rate, low efficiency of photogenerated electron and hole separation of potassium tetratitanate, Catalytic activity limitations and other issues, to achieve the effect of simple preparation method, improve catalytic degradation efficiency and stability

Inactive Publication Date: 2017-05-31
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] Effective control and treatment of various chemical pollution is the focus of comprehensive environmental management. At present, the main methods to deal with these pollutions are physical adsorption, microbial treatment, chemical oxidation and high-temperature incineration, but these methods have low efficiency, easy to Cause secondary pollution and other defects, so it is necessary to develop a treatment method with high efficiency, low energy consumption and deep purification and mineralization ability, photocatalytic technology came into being
[0003] Titanium dioxide, due to its high chemical stability, low cost, easy synthesis and non-toxicity, has been widely studied and applied in real life, but it only responds to ultraviolet light, which greatly reduces its application range. Considering its low The solar energy utilization rate, the researchers developed a new visible light-responsive catalyst, in which layered transition metal oxides respond to ultraviolet light, especially tetratitanate due to its unique layered structure and ionic Exchangeability has attracted much attention, but potassium tetratitanate itself has a relatively low photogenerated electron and hole separation efficiency, and its visible light catalytic activity is also limited to a certain extent. In order to improve its catalytic activity, it needs to be modified
The above methods all use calcination and in-situ growth methods to compound semiconductors or support metal nanoparticles to improve the catalytic degradation activity of the catalyst, but the Ag 3 PO 4 Nanoparticles supported on TiO 2 / K 2 Ti 4 o 9 Not reported on the complex

Method used

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  • Silver phosphate-titanium dioxide/potassium salt tetratitanate compound and preparation method thereof and application
  • Silver phosphate-titanium dioxide/potassium salt tetratitanate compound and preparation method thereof and application
  • Silver phosphate-titanium dioxide/potassium salt tetratitanate compound and preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the first step, 1g K 2 Ti 4 o 9 Disperse with 3g of isopropyl titanate in 40mL of ethanol and stir for 4h, then dry the mixed solution to obtain a white solid, then grind the obtained white solid, put it into a muffle furnace for calcination, the calcination temperature is 450°C, keep warm The time is 4h, the heating rate is 2°C / min, and finally TiO 2 / K 2 Ti 4 o 9 Complex.

[0028] In the second step, 500mg TiO 2 / K 2 Ti 4 o 9 The complex was ultrasonically dispersed in 50 mL of water, 125 mg of AgNO 3 Dubbed the solution which was slowly added and stirred for 30min.

[0029] In the third step, 63mg NaH 2 PO 4 The prepared solution was slowly added dropwise to the solution in the second step, then stirred for 12 hours, centrifuged and washed several times with deionized water, and finally the product was dried to obtain Ag 3 PO 4 -TiO 2 / K 2 Ti 4 o 9 Complex.

[0030] The fourth step, weigh 20mg Ag 3 PO 4 -TiO 2 / K 2 Ti 4 o 9 The complex wa...

Embodiment 2

[0034] In the first step, 1g K 2 Ti 4 o 9 and 3 g of isopropyl titanate were dispersed in 40 mL of ethanol solution and stirred for 4.5 h, then the mixed solution was dried to obtain a white solid, which was ground and then calcined in a muffle furnace at a temperature of 450 ℃, the holding time is 5h, the heating rate is 2℃ / min, and finally TiO 2 / K 2 Ti 4 o 9 Complex.

[0035] In the second step, 500mg TiO 2 / K 2 Ti 4 o 9 The complex was ultrasonically dispersed in 50 mL of water, 250 mg of AgNO 3 Dubbed solution was added slowly, and stirred for 35min.

[0036] In the third step, 125mg NaH 2 PO 4 The prepared solution was slowly added dropwise to the solution in the second step, then stirred for 12 hours, centrifuged and washed with deionized water several times, and finally the product was oven-dried at 60°C to obtain Ag 3 PO 4 -TiO 2 / K 2 Ti 4 o 9 Complex.

[0037] The fourth step, weigh 20mg Ag 3 PO 4 -TiO 2 / K 2 Ti 4 o 9 The complex was placed ...

Embodiment example 3

[0041] In the first step, 1 g of K prepared by high-temperature solid-phase method 2 Ti 4 o 9 Disperse 2g of isopropyl titanate in 40mL ethanol solution and stir for 5h, then dry the mixed solution to obtain a white solid, grind the obtained white solid, and then put it into a muffle furnace for calcination at a temperature of 500°C , the holding time is 4.5h, the heating rate is 2℃ / min, and finally TiO 2 / K 2 Ti 4 o 9 Complex.

[0042] In the second step, 500mg TiO 2 / K 2 Ti 4 o 9 The complex was ultrasonically dispersed in 50 mL of water, 500 mg of AgNO 3 Dubbed into the solution which was slowly added, and stirred for 40min.

[0043] In the third step, 250mg NaH 2 PO 4 The prepared solution was slowly added dropwise to the solution in the second step, then stirred for 12 hours, centrifuged and washed several times with deionized water, and finally the product was dried to obtain Ag 3 PO 4 -TiO 2 / K 2 Ti 4 o 9 Complex.

[0044] The fourth step, weigh 20mg...

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Abstract

The invention discloses a silver phosphate-titanium dioxide/potassium salt tetratitanate compound and a preparation method thereof and an application. Ag3PO4 nano particles are loaded on TiO2/K2Ti4O9 compounds to obtain the silver phosphate-titanium dioxide/potassium salt tetratitanate compound, loading capacity of the Ag3PO4 nano particles is 20%-75%, AgNO3 is gradually dripped into TiO2/K2Ti4O9 compound dispersion liquid, NaH2PO4 solution is slowly added again, and mixture reacts in a stirring manner to obtain Ag3PO4-TiO2/K2Ti4O9 compound. The Ag3PO4-TiO2/K2Ti4O9 compound serves as a catalyst, photocatalytic degradation of dyes can be achieved, the rate degrading rhodamine B reaches 0.0643min<-1> under visible light, the rate degrading methylene blue reaches 0.391min<-1> under visible light, the rate degrading methyl orange reaches 0.0327min<-1> under visible light, the catalytic activity of individual components of the compound is greatly improved, and the compound has excellent photocatalytic degradation effects.

Description

technical field [0001] The invention relates to a layered titanate composite loaded metal salt, in particular to an Ag 3 PO 4 -TiO 2 / K 2 Ti 4 o 9 The compound and its preparation method and application belong to the field of material preparation. Background technique [0002] Effective control and treatment of various chemical pollution is the focus of comprehensive environmental management. At present, the main methods to deal with these pollutions are physical adsorption method, microbial treatment method, chemical oxidation method and high temperature incineration method, but these methods have low efficiency, easy to Cause secondary pollution and other defects, so it is necessary to develop treatment methods with high efficiency, low energy consumption and deep purification and mineralization ability, and photocatalytic technology has emerged as the times require. [0003] Titanium dioxide, due to its high chemical stability, low cost, easy synthesis and non-toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18C02F1/30C02F101/38
CPCB01J27/1817B01J35/004C02F1/30C02F2101/308C02F2101/38C02F2101/40C02F2305/10
Inventor 卞凯丽付永胜汪信朱俊武
Owner NANJING UNIV OF SCI & TECH
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