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Three-dimensional porous carbon nitride photocatalytic material, and preparation method and application thereof

A photocatalytic material and three-dimensional porous technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low catalytic efficiency and easy agglomeration, and achieve simple preparation process and wide sources , cheap effect

Inactive Publication Date: 2020-06-02
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to develop a low-cost, high-efficiency three-dimensional material that can be used for photocatalytic treatment of heavy metal wastewater in view of the technical problems of existing photocatalysts that are easy to agglomerate and have low catalytic efficiency.

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  • Three-dimensional porous carbon nitride photocatalytic material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A preparation method of the three-dimensional porous carbon nitride photocatalytic material of the present invention:

[0018] (1) Weigh 20g of melamine and dissolve it in 250mL of absolute ethanol, stir it in an oil bath at 60°C for 30min, then remove the liquid in the mixed solution, make it evenly dispersed in the crucible, cover and place in the muffle furnace , Calcined at 500°C for 2 hours, and then heated to 520°C for 2 hours. After cooling, take out the massive solid from the crucible and grind it into a fine powder, put it in the crucible again, and place it in the muffle furnace without a lid for 3 hours to obtain g-C 3 N 4 material;

[0019] (2) The g-C obtained in step (1) 3 N 4 Weigh 5g of the material, add hexamethylenetetramine according to the ratio of 1:0.2, make it evenly mixed, and anneal in a muffle furnace at 500°C for 2 hours to obtain three-dimensional g-C 3 N 4 Photocatalytic materials.

[0020] Such as figure 1 As shown, the prepared three-dimensional...

Embodiment 2

[0022] Three-dimensional g-C of the present invention 3 N 4 The photocatalytic material is used to remove heavy metal ions in water, including the following steps: take 200 mL of hexavalent chromium wastewater with a concentration of 5 mg / L, and adjust the pH of the solution to 2, 5, 8, 10 with perchloric acid or sodium hydroxide. 1 3D gC prepared 3 N 4 The photocatalytic material is added to the waste water sample, the addition amount of 2.5g per liter of waste water, the reactor is placed on a magnetic stirrer with a rotating speed of 1000 to 1200 rpm for reaction, and after 30 minutes of magnetic stirring under no light conditions, light is added for reaction , Take samples after a total of 150 minutes of continuous reaction. Using diphenylcarbazide spectrophotometry, the concentration of hexavalent chromium in the solution was measured at a wavelength of 540nm. The calculated removal rate results are shown in Table 1.

[0023] Table 1 Effects of different pH conditions on th...

Embodiment 3

[0027] Three-dimensional g-C of the present invention 3 N 4 The photocatalytic material is used to remove heavy metal ions in water, including the following steps:

[0028] Take two parts of 200mL hexavalent chromium wastewater with a concentration of 5mg / L, adjust the pH of the solution to 2 with perchloric acid, and combine the three-dimensional g-C prepared in Example 1 3 N 4 The photocatalytic material is added to the wastewater sample, the addition amount of 2.5g per liter of wastewater, the reactor is placed on a magnetic stirrer with a rotating speed of 1000 to 1200 rpm for reaction, one of the samples is magnetically stirred under the condition of no light , The adsorption reaction is carried out; the other sample is turned on the light, and the photocatalytic reaction is carried out; samples are taken every 30 minutes, and the reaction lasts for 120 minutes. Using diphenylcarbazide spectrophotometry, the concentration of hexavalent chromium in the solution was measured at...

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Abstract

The invention relates to a three-dimensional porous carbon nitride photocatalytic material, and a preparation method and an application thereof. The preparation method of the photocatalytic material comprises the following steps: dissolving melamine in absolute ethyl alcohol, uniformly stirring, removing part of the solvent, and calcining the obtained mixture in a muffle furnace to obtain a layered carbon nitride material; and adding hexamethylenetetramine into the carbon nitride material, uniformly mixing, putting the obtained mixture into the muffle furnace, and annealing and calcining the mixture to obtain the three-dimensional porous carbon nitride photocatalytic material. The material can efficiently reduce hexavalent chromium in wastewater, the preparation process is simple, and rawmaterials required in the preparation process are wide in source and low in price. The photocatalytic material can solve the problems of lamellar carbon nitride accumulation, high photon-generated carrier recombination rate and the like, and can be widely used for treating heavy metal wastewater.

Description

Technical field [0001] The invention belongs to the new technical field of environmental functional materials and water treatment, and specifically relates to a three-dimensional porous carbon nitride photocatalytic material and a preparation method and application thereof. Background technique [0002] With the rapid development of industrialization, heavy metals are widely used in industrial production processes such as steel, electronics, metal processing, paint, and wood preservatives. However, due to improper storage and disposal, heavy metal ions have become common pollutants in water bodies. However, heavy metal ions can exist for a long time in the water environment and are difficult to degrade, which seriously threatens the safety of the ecological environment and affects human health. Remediation of heavy metal polluted water bodies has always been a major challenge. Among them, chromium is one of the most common heavy metal pollutants in water. Hexavalent chromium h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00B01J35/02C02F1/30C02F101/22
CPCB01J27/24C02F1/30C02F2305/10C02F2101/22B01J35/50B01J35/39
Inventor 胡新将张丽莉袁雪婷李闯崔靖烨李江谭小飞
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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