Reducing carbon nitride photocatalyst, preparation method and application thereof

A photocatalyst and catalyst technology, applied in the field of photocatalysis, can solve the problems of shifting up the valence band and shifting down the conduction band, etc., to achieve the effects of reducing the bandgap width, improving the oxidation ability, and improving the separation

Active Publication Date: 2020-04-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite these advantages, the reduction of the bandgap usually leads to a downward shift of the conduction band (CB) and / or an upward shift of the valence band (VB), inevitably at the expense of the redox capability of the photocatalyst

Method used

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  • Reducing carbon nitride photocatalyst, preparation method and application thereof
  • Reducing carbon nitride photocatalyst, preparation method and application thereof
  • Reducing carbon nitride photocatalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Weigh 5g of melamine in an alumina crucible and heat it in a muffle furnace at 5°C min -1 The heating rate is heated to 550 ° C for 4 hours. After it has cooled to room temperature, g-C is obtained by grinding and sieving 3 N 4 powder;

[0037] 2. Add NaBH with a mass ratio of 0.05:1 4 and g-C 3 N 4 The powder is mixed well in a mortar.

[0038] 3. Put the well-mixed sample into the tube furnace, under N 2 At 5°C·min under atmosphere -1 The temperature was raised to 600°C for 30 minutes at a certain rate.

[0039] 4. After cooling in an open atmosphere, the product was rinsed 5 times with deionized water and ethanol, and dried at 70 °C for 24 h to obtain a reducing carbon nitride (RCN) photocatalyst powder.

[0040] figure 1 Be the reducing carbon nitride (RCN) in the present embodiment and the g-C in the comparative example 1 3 N 4 Transmission electron microscope (TEM) image of . Among them, (a) is g-C 3 N 4 , (b) is RCN. from figure 1 RCN and g-C ...

Embodiment 2

[0053] 1. Weigh 5g of melamine in an alumina crucible and heat it in a muffle furnace at 5°C min -1 The heating rate is heated to 520 ° C for 5 hours. After it has cooled to room temperature, g-C is obtained by grinding and sieving 3 N 4 powder.

[0054] 2. Add NaBH with a mass ratio of 0.11:1 4 and g-C 3 N 4 Put in a mortar and mix well, put the well mixed sample into a tube furnace, under N 2 At 6°C·min under atmosphere -1 The temperature was raised to 570°C for 40 minutes at a certain rate.

[0055] 3. After cooling in an open atmosphere, the product was rinsed 4 times with deionized water and ethanol, and dried at 75°C for 22 h to obtain a reducing carbon nitride (RCN) photocatalyst powder.

Embodiment 3

[0057] 1. Weigh 5g of melamine in an alumina crucible and heat it in a muffle furnace at 5°C min -1 The heating rate is heated to 530 ° C for 4.5 hours. After it has cooled to room temperature, g-C is obtained by grinding and sieving 3 N 4 powder.

[0058] 2. Add NaBH with a mass ratio of 0.08:1 4 and g-C 3 N 4 Mix thoroughly in a mortar, put the fully mixed sample into a tube furnace, and heat at 6°C min under an argon atmosphere. -1 The temperature was raised to 580°C for 35 minutes at a certain rate.

[0059] 3. After cooling in an open atmosphere, the product was rinsed three times with deionized water and ethanol, and dried at 65 °C for 20 h to obtain a reducing carbon nitride (RCN) photocatalyst powder.

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Abstract

Belonging to the technical field of photocatalysis, the invention discloses a reducing carbon nitride photocatalyst, a preparation method and application thereof. The photocatalyst is prepared by thesteps of: heating melamine to 520-550DEG C, performing roasting, and conducting grinding to obtain g-C3N4 powder; mixing NaBH4 with g-C3N4 powder, and then performing heating to 570-600DEG C in a protective atmosphere; and performing cooling, then cleaning the product with deionized water and ethanol, and conducting drying. The reducing carbon nitride catalyst does not contain metal, and has the advantages of environmental protection, stability, low cost and the like. According to the invention, reducing carbon nitride is applied to photocatalytic degradation of diclofenac sodium for the firsttime, also shows excellent photocatalytic performance, and has good stability.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and more specifically relates to a reducing carbon nitride photocatalyst and its preparation method and application. Background technique [0002] In recent years, pharmaceutical and personal care products (Pharmaceutical and Personal Care Products, PPCPs) are emerging pollutants, including various antibiotics, synthetic musk, painkillers, antihypertensive drugs, contraceptives, hypnotics, weight loss drugs, Hairspray, hair dye and fungicide, etc., have received extensive attention. PPCPs are persistent, bioaccumulative, and difficult to effectively degrade through conventional biological treatment, making them frequently detected in ambient aquatic environments. Residual PPCPs pollutants pose a potential threat to water quality and the overall health of the ecosystem. Therefore, the research and development of efficient treatment methods for PPCPs is of great significance for ensuring w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/16C02F1/72C02F1/30C02F101/38C02F101/36C02F101/34
CPCB01J27/24B01J35/004B01J37/08B01J37/16C02F1/725C02F1/30C02F2101/38C02F2101/36C02F2101/34C02F2305/10Y02W10/37
Inventor 刘国光金小愉吴昱亮黄守彬吕文英
Owner GUANGDONG UNIV OF TECH
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