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Acid-modified g-C3N4 photocatalyst and preparation and application thereof

A photocatalyst and acid modification technology, applied in the field of photocatalysis, can solve the problems of high cost of raw materials, failure to meet industrial requirements, complicated operation, etc.

Inactive Publication Date: 2018-02-13
FUYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the above-mentioned preparation method is not only complicated in operation and high in cost of raw materials, but also the degree of increase in the photocatalytic efficiency of the modified photocatalyst obtained is limited, which cannot meet the industrial requirements.

Method used

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  • Acid-modified g-C3N4 photocatalyst and preparation and application thereof
  • Acid-modified g-C3N4 photocatalyst and preparation and application thereof
  • Acid-modified g-C3N4 photocatalyst and preparation and application thereof

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preparation example Construction

[0023] An acid modified g-C 3 N 4 The preparation method of the photocatalyst includes the following steps:

[0024] In step (1), the nitrogen-containing organic matter, distilled water and organic acid are put together in a reaction kettle, the temperature is raised to react, and the temperature is lowered after the reaction to obtain product I.

[0025] The inventors found that the use of low molecular weight nitrogen-containing organic matter with a carbon to nitrogen ratio of 1:3 to 3:1 as a raw material, preferably a small molecular weight nitrogen-containing organic matter with a carbon to nitrogen ratio of 1:2 as a raw material, After calcination in ℃ environment, gC with network structure can be obtained 3 N 4 , Such as cyanamide, dicyandiamine, melamine, urea, guanidine hydrochloride, etc., preferably melamine.

[0026] After research, it was found that g-C prepared by polycondensation of melamine 3 N 4 It contains a small amount of hydrogen, these hydrogens exist on the pri...

Embodiment 1

[0058] Accurately weigh 3.0 g of melamine and place it in the reactor, add 40 mL of distilled water and 10 mL of glacial acetic acid, then put it into an oven, set the temperature to 180°C, and after reacting for 12 hours, take out the reactor and cool it naturally to room temperature. The obtained product was suction filtered, washed with distilled water, and placed in an oven at 60°C for vacuum drying. Put the dried product into a closed porcelain crucible, heat it to 520℃ at a rate of 10℃ / min in a box-type resistance furnace, take it out after calcination for 4h and cool it to room temperature. Grind the resultant product. The catalyst sample is marked as HAc(10) / gC 3 N 4 , And finally put the product in the sample bag, sealed and stored.

Embodiment 2

[0060] Accurately weigh 3.0 g of melamine and place it in the reactor, add 40 mL of distilled water and 20 mL of glacial acetic acid, then put it in an oven, set the temperature to 180°C, and after reacting for 12 hours, take out the reactor and cool to room temperature. The obtained product was suction filtered, washed with distilled water, and placed in an oven at 60°C for vacuum drying. Put the dried product into a closed porcelain crucible, heat it to 520℃ at a rate of 10℃ / min in a box-type resistance furnace, take it out after calcination for 4h and cool it to room temperature. Grind the resultant product. The catalyst sample is marked as HAc(20) / gC 3 N 4 , And finally put the product in the sample bag, sealed and stored.

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Abstract

The invention provides an acid-modified g-C3N4 photocatalyst and preparation and application thereof. glacial acetic acid and nitrogen-bearing organic matters are used as precursors to prepare the acid-modified g-C3N4 photocatalyst by means of impregnating-roasting; the acid-modified g-C3N4 photocatalyst is characterized via X-ray diffraction (XRD), photoluminescence spectroscopy (PL), infrared spectroscopy (IR), ultraviolet-visible light diffused reflection spectroscopy (UV-Vis DRS) and the like. The invention also relates to application of the acid-modified g-C3N4 photocatalyst; photocatalytic activity of the acid-modified g-C3N4 photocatalyst is evaluated by using methyl orange as a photocatalytic reaction model compound.

Description

Technical field [0001] The invention relates to an acid modified g-C for treating dye wastewater pollution 3 N 4 The photocatalyst and its preparation and application belong to the field of photocatalysis. Background technique [0002] g-C 3 N 4 With its high photocatalytic activity, good stability, low price of raw materials, especially metal-free, this outstanding advantage makes it a new type of photocatalytic material. However, single-phase catalysts are usually caused by low quantum efficiency. The photocatalytic performance is not satisfactory. Because g-C 3 N 4 The high photo-generated electron-hole recombination rate of the material results in low catalytic efficiency, which limits its application in photocatalysis. [0003] To improve g-C 3 N 4 Many modification methods have been studied for its catalytic activity. To g-C 3 N 4 The non-metallic elements to be modified include S, N, C, B, F, P, etc. It is generally believed that these non-metallic elements replace the C, ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCC02F1/30B01J27/24C02F2101/308B01J35/39
Inventor 李慧泉崔玉民苗慧师瑞娟
Owner FUYANG NORMAL UNIVERSITY
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