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Weak-luminescence g-C3N4 photocatalyst and preparation method and application thereof

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of low specific surface area, application limitation, low photocatalytic efficiency, etc., and achieve the effect of stable chemical properties and good stability

Inactive Publication Date: 2019-12-13
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

pure g-C 3 N 4 Due to the low specific surface area and rapid photogenerated electron-hole recombination of photocatalysts, the photocatalytic efficiency is very low, so the application is limited.

Method used

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  • Weak-luminescence g-C3N4 photocatalyst and preparation method and application thereof
  • Weak-luminescence g-C3N4 photocatalyst and preparation method and application thereof
  • Weak-luminescence g-C3N4 photocatalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Pure g-C 3 N 4 catalyst of light

[0025] Preparation method: Measure 2.52 grams of melamine into an alumina crucible, transfer it to a muffle furnace, and roast it at 550 °C for 4 hours in an air atmosphere (the heating rate is 5 °C min -1 ), to obtain pure g-C 3 N 4 catalyst of light.

[0026] (2) Weak luminescence g-C 3 N 4 catalyst of light

[0027] Add 2.52 g (0.02 mol) of solid melamine into 100 ml of 50% (v / v) ethanol solution, stir in a water bath at 60° C. for 30 min until it dissolves uniformly. Add 0.0122g of benzoic acid (0.001mol) into 20ml of absolute ethanol, stir for 20min until it dissolves evenly, then add dropwise into the ethanol solution of melamine. Stir in a water bath at 60°C for 2h, and sonicate for 30min. The obtained product was transferred to an oven and dried at 70° C. for 12 hours to obtain a white intermediate product. Grind the obtained white intermediate product, put it into an alumina crucible, transfer it to a muffle furn...

Embodiment 2

[0035] The Molar Ratio of Melamine and Benzoic Acid Effect on Weak Luminescence g-C 3 N 4 Effect of Photocatalyst on Catalytic Degradation of Rhodamine B under Visible Light

[0036] (1) Weakly emitting g-C with different molar ratios 3 N 4 Preparation of photocatalyst

[0037] Table 1

[0038]

[0039] The preparation method is as follows: add 2.52 g (0.02 mol) of melamine solid into 100 ml of 50% (v / v) ethanol solution, stir in a water bath at 60° C. for 30 min until it is uniformly dissolved. As shown in Table 1, add benzoic acid into 20ml of absolute ethanol, stir for 20min until it dissolves evenly, and then add it dropwise into the ethanol solution of melamine. Stir in a water bath at 60°C for 2h, and sonicate for 30min. The obtained product was transferred to an oven and dried at 70° C. for 12 hours to obtain a white intermediate product. Grind the obtained white intermediate product, put it into an alumina crucible, transfer it to a muffle furnace, and bake i...

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Abstract

The invention discloses a weak-luminescence g-C3N4 photocatalyst and a preparation method and application thereof. According to the invention, melamine and benzoic acid are used as raw materials; benzoic acid is used for modifying a melamine precursor; and the g-C3N4 photocatalyst is prepared through roasting. The g-C3N4 prepared by the preparation method disclosed by the invention has relativelylow photoluminescence intensity, inhibits the recombination of photon-generated carriers, and can effectively improve energy conversion efficiency, thereby improving photocatalytic efficiency. The g-C3N4 prepared by using the method has multi-slit surface morphology, which is beneficial for conveying photon-generated carriers to the surface of the semiconductor photocatalyst. The method has the advantages of low cost and convenient operation. The photocatalyst can degrade harmful substances such as rhodamine B under the irradiation of visible light, and thus has important practical applicationvalue in environmental purification and clean energy production.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to the preparation of weakly luminous g-C by modifying precursors 3 N 4 Methods and applications of photocatalysts. Background technique [0002] As energy and environmental issues increasingly restrict the development of modern society, photocatalytic technology has received increasing attention. Photocatalytic materials can use sunlight to hydrolyze hydrogen, decompose harmful substances, and solve energy and environmental problems faced by human development. At present, photocatalysts produced by light irradiation have a high recombination rate of electron-hole pairs, low photon utilization efficiency, and low photocatalytic activity. Therefore, it is necessary to study the modification of semiconductor photocatalysts. The purpose and function of modification include improving excitation charge separation and inhibiting carrier recombination to imp...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38C02F101/30
CPCB01J27/24C02F1/30C02F2101/38C02F2305/10C02F2101/308B01J35/39
Inventor 王绩伟鲍勇霖敖韵琪丁勇梅勇刘雯杨涵黄峻霆张璐
Owner LIAONING UNIVERSITY
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