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A kind of preparation method of titanium dioxide/graphite phase carbon nitride composite photocatalyst

A technology of graphite phase carbon nitride and titanium dioxide, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as unsuitable for industrial production, complicated process, and complex process, and achieve cost reduction low cost, simple process, and high photocatalytic activity

Active Publication Date: 2019-07-09
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses isocyanate as a raw material, which is toxic and costly, and the process is relatively complicated; Chinese patent CN102125863A discloses a preparation method of a graphitic carbon nitride / rutile single crystal titanium dioxide nanowire array. The preparation steps are as follows: a ) Dissolving the cyanamide compound or urea in the solution, then immersing the prepared rutile single crystal titanium dioxide nanowire array in the cyanamide compound or urea solution, then taking it out and drying it; b) heat-treating the dried nanowire array , that is, graphitic carbon nitride / rutile single crystal titania nanowire arrays were prepared
However, this preparation method is divided into two steps. It is necessary to prepare the titanium dioxide nanowire array first, and then prepare the composite material. The process is relatively complicated and is not suitable for industrial production.

Method used

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  • A kind of preparation method of titanium dioxide/graphite phase carbon nitride composite photocatalyst
  • A kind of preparation method of titanium dioxide/graphite phase carbon nitride composite photocatalyst
  • A kind of preparation method of titanium dioxide/graphite phase carbon nitride composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0030] In a 100mL centrifuge tube, add 6mL of ethanol, add 0.2g of urea and stir evenly, then add 3.8g of tetrabutyl titanate and 0.63g of glacial acetic acid into the centrifuge tube, stir evenly to obtain solution A. Add 0.8g of distilled water and 2.4g of ethanol into another container, mix well, and add dropwise to solution A at a rate of 6mL / h, keep stirring until titanium dioxide / carbon nitride gel is formed, stop stirring and let it stand for aging Leave for 24 hours. Put the obtained titanium dioxide / carbon nitride gel into an oven at 80° C. until it is dried and taken out. Grind and weigh, transfer to a crucible, and calcinate in a muffle furnace at 600°C for 4 hours to obtain a titanium dioxide / graphite phase carbon nitride composite photocatalyst. Transmission electron microscopy showed that, as figure 1 As shown: the crystallization degree of titanium dioxide in the catalyst is relatively good, and it is evenly distributed in the graphite phase carbon nitride she...

Embodiment 2

[0032] In a 100mL centrifuge tube, add 6mL of ethanol, add 0.2g of urea and stir evenly, then add 4.2g of tetrabutyl titanate and 0.72g of glacial acetic acid into the centrifuge tube, stir evenly to obtain solution A. Add 0.93g of distilled water and 2.91g of ethanol into another container, mix well, and add dropwise to solution A at a rate of 1mL / h, keep stirring until a titanium dioxide / carbon nitride gel is formed, stop stirring and let stand for 12 hours. Put the obtained titanium dioxide / carbon nitride gel into an oven at 80° C. until it is dried and taken out. Grind and weigh, transfer to a crucible, and calcinate in a muffle furnace at 550°C for 3 hours to obtain a titanium dioxide / graphite phase carbon nitride composite photocatalyst.

Embodiment 3

[0034] In a 100mL centrifuge tube, add 6mL of ethanol, add 0.2g of urea and stir well, then add 3.33g of tetrabutyl titanate and 0.72g of glacial acetic acid into the centrifuge tube, stir well to obtain solution A. Add 0.67g of distilled water and 1.96g of ethanol into another container, mix well, and add dropwise to solution A at a rate of 9mL / h, keep stirring until a titanium dioxide / carbon nitride gel is formed, stop stirring and let stand 6 hours. Put the obtained titanium dioxide / carbon nitride gel into an oven at 80° C. until it is dried and taken out. Grind and weigh, transfer to a crucible, and calcinate in a muffle furnace at 500°C for 5 hours to obtain a titanium dioxide / graphite phase carbon nitride composite photocatalyst.

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Abstract

The invention discloses a preparation method of a titanium dioxide / graphite phase carbon nitride composite photocatalyst, and belongs to the technical fields of material preparation and photocatalysis. The preparation method is: disperse cyanamide or urea in an ethanol solution, add a certain volume of tetrabutyl titanate and glacial acetic acid, and stir evenly; mix a certain proportion of distilled water and ethanol evenly and slowly add it dropwise to the above solution. Stir until a titanium dioxide / carbon nitride gel is formed, leave it for aging, dry, grind and calcine to obtain a titanium dioxide / graphite phase carbon nitride composite photocatalyst. The preparation method of the present invention has cheap raw materials, fast and simple steps, and the photocatalytic performance of the obtained catalyst is better than that of ordinary commercial titanium dioxide P25 catalyst, and can be widely used in the field of photocatalysis.

Description

technical field [0001] The invention relates to the technical field of material preparation and photocatalysis, in particular to a method for preparing a titanium dioxide / graphite-phase carbon nitride composite photocatalyst. Background technique [0002] With the progress of human society and the development of global industry, the problems of environmental pollution and energy shortage are becoming more and more serious. Photocatalytic technology, as one of the most valuable green technologies to alleviate the energy crisis and purify the environment, has received extensive attention. [0003] Titanium dioxide, as one of the most widely used semiconductor photocatalysts, has the advantages of non-toxicity, easy availability, stability, low cost and excellent photocatalytic activity. However, the titanium dioxide semiconductor has a band gap of about 3.0-3.2eV and can only absorb ultraviolet light which accounts for less than 5% of sunlight, so its light utilization rate is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J37/033B01J37/036B01J35/393B01J35/39
Inventor 张慧曹鑫孙建华
Owner JIANGSU UNIV OF TECH