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Chromic oxide-doped carbon nitride composite visible photocatalyst, and preparation method and application thereof

A technology of chromium trioxide and nitrogen carbide, which is applied in the field of visible light catalysis, can solve the problems of low activity, achieve the effects of simple preparation process, solve environmental problems, and convenient operation

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There have been related reports g-C 3 N 4 Under the action of visible light, it can photolyze water to produce hydrogen, degrade dye molecules or other organic substances, etc., but the activity is relatively low.
Therefore, seeking to prepare highly active, low-cost g-C 3 N 4 Relevant material is nicely challenging
However, using small molecules of dicyandiamide and chromium nitrate as precursors, g-C was prepared by polycondensation at a certain temperature while chemical bonding occurred. 3 N 4 Supporting metal oxides and their application in the degradation of organic matter have not been reported so far

Method used

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  • Chromic oxide-doped carbon nitride composite visible photocatalyst, and preparation method and application thereof
  • Chromic oxide-doped carbon nitride composite visible photocatalyst, and preparation method and application thereof
  • Chromic oxide-doped carbon nitride composite visible photocatalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Weigh 4.0g of dicyandiamide and dissolve it in water. Then weigh 0.4g Cr(NO 3 ) 3 9H 2 Dissolve O in the above solution, keep stirring, and dry the water. Then put it into a tube furnace, under nitrogen protection, and calcined at 600°C for 4h to obtain the corresponding Cr 2 o 3 g-C 3 N 4 Composite photocatalytic materials. Test the photocatalytic degradation performance of the material for rhodamine B, such as Figure 4 shown.

Embodiment 2

[0034] Weigh 4.0g of dicyandiamide and dissolve it in water. Then weigh 0.8g Cr(NO 3 ) 3 9H 2 Dissolve O in the above solution, keep stirring, and dry the water. Then put it into a tube furnace, under nitrogen protection, and calcined at 600°C for 4h to obtain the corresponding Cr 2 o 3 g-C 3 N 4 Composite photocatalytic materials. The photocatalytic degradation performance of the material for Rhodamine B was tested. After 9 hours of visible light irradiation, the removal rate of Rhodamine B could reach 70.1%.

Embodiment 3

[0036] Weigh 4.0g of dicyandiamide and dissolve it in water. Then weigh 0.04g Cr(NO 3 ) 3 9H 2 Dissolve O in the above solution, keep stirring, and dry the water. Then put it into a tube furnace, under nitrogen protection, and calcined at 600°C for 4h to obtain the corresponding Cr 2 o 3 g-C 3 N 4 Composite photocatalytic materials. The photocatalytic degradation performance of the material for rhodamine B was tested. After 9 hours of visible light irradiation, the removal rate of rhodamine B could reach 51.1%.

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Abstract

The invention discloses a method for preparing a chromic oxide-doped carbon nitride (Cr2O3@g-C3N4) composite visible photocatalysis material, and an application of the material. The method comprises the following steps: dissolving chromium nitrate and carbon and nitrogen sources, fully mixing, drying, and roasting the obtained dried mixture in inert atmosphere to obtain the Cr2O3@g-C3N4) composite visible photocatalyst. The catalyst has a good removal effect in visible photocatalysis degradation treatment of a rhodamine B solution, and still has high catalysis activity after the catalyst is reused five times. The composite visible photocatalyst overcomes the disadvantages of low phototransformation efficiency and low activity of a single material, and has the advantages of wide light response range, high visible photocatalytic activity, low cost, and simple and easily controlled preparation process. The photocatalyst can be used in the environmental protection field, and has wide application prospect in visible photocatalytic degradation of organic pollutants in water.

Description

technical field [0001] The invention relates to the technical field of visible light catalysis, in particular to a dichromium trioxide oxide and g-C 3 N 4 Composite visible light catalyst and its preparation method and application. Background technique [0002] Environmental pollution is one of the focus issues that the world pays attention to. Exploring some simple methods, low energy consumption, high efficiency, and technologies that can control environmental pollution is a research hotspot in environmental treatment. Photocatalytic technology is a new type of advanced oxidation technology, which uses semiconductor materials to separate photogenerated carriers under light irradiation conditions to generate oxidative or reductive free radicals, which can non-selectively Degradation of organic pollutants in water is a low-cost, environmentally friendly water treatment technology. In addition, photocatalytic technology also has the advantages of mild reaction conditions, ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F1/58
Inventor 樊芸陈吉平张海军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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