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G-carbon nitride-titanium dioxide-silver nanosheet composite, biomimetic synthesis method and application thereof

A technology of titanium dioxide and silver nanosheets, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as limiting solar energy utilization efficiency, achieve mild conditions, facilitate absorption, and simple preparation methods Effect

Inactive Publication Date: 2015-04-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 It has a wide band gap and can only absorb ultraviolet rays with a wavelength less than 387nm, which limits its utilization efficiency of solar energy.

Method used

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  • G-carbon nitride-titanium dioxide-silver nanosheet composite, biomimetic synthesis method and application thereof
  • G-carbon nitride-titanium dioxide-silver nanosheet composite, biomimetic synthesis method and application thereof
  • G-carbon nitride-titanium dioxide-silver nanosheet composite, biomimetic synthesis method and application thereof

Examples

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Effect test

Embodiment 1

[0021] Embodiment 1: prepare g-carbon nitride-titanium dioxide-silver nanosheet composite, comprising the following steps:

[0022] Step 1) Weigh 10 g of melamine powder, put it in an alumina crucible, and calcinate at 550° C. for 4 hours to obtain carbon nitride.

[0023] Step 2) Weigh 0.104g of arginine, dissolve it in 10mL of deionized water to obtain a 0.6mol / L arginine solution, and adjust the pH of the arginine solution to 7;

[0024] The configuration concentration is 0.25mol / L bis(2-hydroxypropionic acid)diammonium titanium hydroxide (Ti-BALDH) solution;

[0025] Configure a carbon nitride suspension with a concentration of 60mg / mL;

[0026] Step 3) Take 10 mL of arginine solution with a pH of 7, add it to the carbon nitride suspension, and stir for 3 hours. Then add 1ml of 0.25 mol / L Ti-BALDH solution to the above mixture, stir for 0.5h to obtain a carbon nitride-titanium dioxide precipitation complex, dry and calcinate in a muffle furnace at 480°C for 2 hours to ob...

Embodiment 2

[0029] Embodiment 2: prepare g-carbon nitride-titanium dioxide-silver nanosheet composite, comprising the following steps:

[0030] Step 1) prepare carbon nitride, same as Example 1;

[0031] Step 2) configure arginine solution, Ti-BALDH solution and carbon nitride suspension, the same as in Example 1;

[0032] Step 3) prepare sheet g-carbon nitride-titanium dioxide composite, same as Example 1;

[0033] Step 4) Dissolve the flaky g-carbon nitride-titanium dioxide complex prepared above in 10ml of water to prepare a 5mg / ml suspension, add 2ml of 2mg / ml diHPP solution, and stir vigorously for 30min. The resulting solution was centrifuged and washed three times, and 20 ml of AgNO was added 3 solution, making Ag + The concentration was 2mmol / L, and stirred at room temperature for 24h. Washing with deionized water and freeze-drying to obtain the g-carbon nitride-titanium dioxide-silver-2 nanosheet composite.

Embodiment 3

[0034] Embodiment 3: prepare g-carbon nitride-titanium dioxide-silver nanosheet composite, comprising the following steps:

[0035] Step 1) prepare carbon nitride, same as Example 1;

[0036] Step 2) configure arginine solution, Ti-BALDH solution and carbon nitride suspension, the same as in Example 1;

[0037] Step 3) prepare sheet g-carbon nitride-titanium dioxide composite, same as Example 1;

[0038] Step 4) Dissolve the flaky g-carbon nitride-titanium dioxide complex prepared above in 10ml of water to prepare a 5mg / ml suspension, add 2ml of 2mg / ml diHPP solution, and stir vigorously for 30min. The resulting solution was centrifuged and washed three times, and 20 ml of AgNO was added 3 solution, making Ag + The concentration was 1mmol / L, and stirred at room temperature for 24h. Washing with deionized water and freeze-drying to obtain the g-carbon nitride-titanium dioxide-silver-1 nanosheet composite.

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Abstract

The invention discloses a g-carbon nitride-titanium dioxide-silver nanosheet composite. Arginine is utilized as the inducer to realize mineralization of titanium dioxide, 3, 4-dihydroxyphenylpropionic acid is utilized to reduce Ag<+>; the carbon nitride in the g-carbon nitride-titanium dioxide-silver nanosheet composite is a nanosheet structure, the titanium dioxide nanoparticles grow on the carbon nitride in situ is about 10nm, the Ag nanoparticles are about 5nm, the titanium dioxide is anatase type, and the mass ratio of carbon nitride in the composite is 0.80-0.85. The preparation process includes: mixing and reacting an arginine solution with the suspension of carbon nitride for a period of time; adding the Ti-BALDH solution into the suspension to carry out mixed reaction for a period of time, conducting centrifugal washing, freeze drying and calcination, then carrying out violent stirring reaction with a diHPP solution for half an hour, further adding an AgNO3 solution of certain centration, carrying out room temperature stirring reaction for 24h to obtain the g-carbon nitride-titanium dioxide-silver nanosheet composite catalyst. The method provided by the invention is simple and convenient, the reaction conditions are mild, and the obtained catalyst can effectively degrade dyes under visible light.

Description

technical field [0001] The invention relates to a synthesis method of organic-inorganic composite materials, in particular to a g-C 3 N 4 / TiO 2 Biomimetic synthesis of Ag / Ag nanosheet composites. Background technique [0002] At present, photocatalytic technology has been widely used in the control of environmental pollution and the utilization of solar energy. TiO 2 Due to its low price and stable chemical properties, it has become the most widely studied and applied catalyst. But TiO 2 The band gap is wide, and it can only absorb ultraviolet light with a wavelength less than 387nm, which limits its utilization efficiency of solar energy. TiO modified by noble metal deposition 2 Absorption in the visible light region can be achieved, increasing the range of light absorption. In addition, wide-narrow semiconductor recombination is an economical and efficient modification method. [0003] Carbon nitride is a novel metal-free visible light catalyst, which has been ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
Inventor 姜忠义佟振伟杨冬
Owner TIANJIN UNIV
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