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Preparation and application of composite photocatalyst g-C3N4-BiFeO3 for efficiently removing persistent organic pollutants

A technology of organic pollutants, g-c3n4-, applied in the direction of physical/chemical process catalysts, water pollutants, chemical instruments and methods, etc., can solve the problems of limitations, low photocatalytic activity, etc., and achieve good repeatability and raw materials Rich, easy to obtain, and convenient for industrialization

Active Publication Date: 2015-11-18
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However a single g-C 3 N 4 It can only absorb a small part of visible light, so g-C alone 3 N 4 The photocatalytic activity is not high, which limits its practical application

Method used

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  • Preparation and application of composite photocatalyst g-C3N4-BiFeO3 for efficiently removing persistent organic pollutants
  • Preparation and application of composite photocatalyst g-C3N4-BiFeO3 for efficiently removing persistent organic pollutants
  • Preparation and application of composite photocatalyst g-C3N4-BiFeO3 for efficiently removing persistent organic pollutants

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preparation example Construction

[0026] g-C 3 N 4 -The preparation method of bismuth ferrite composite photocatalyst, this method comprises:

[0027] (1) dissolving bismuth salt and iron salt in an organic solvent respectively to form an organic solution containing bismuth salt and an organic solution containing iron salt;

[0028] (2) fully mixing the organic solution containing bismuth salt and the organic solution containing iron salt in the same proportion in (1), and magnetically stirring for a certain period of time to form a mixed organic solution containing bismuth salt and iron salt;

[0029] (3) Add a certain amount of melamine into the mixed solution of (2);

[0030] (4) Evaporating the mixed organic solution in (3) to dryness to obtain a xerogel;

[0031] (5) Grind the xerogel in (4) into powder, transfer it to a muffle furnace for calcination, cool to room temperature, and grind to obtain a sample:

[0032] The bismuth salt described in step (1) is bismuth nitrate and its hydrate, the iron sa...

Embodiment 1

[0039] First weigh 0.005mol of Bi(NO 3 ) 3 ·5H 2 O and 0.005molFe(NO 3 ) 3 9H 2 The O samples were dissolved in 30ml of ethylene glycol methyl ether solution, dissolved evenly under magnetic stirring at room temperature, and the Bi(NO 3) 3 Ethylene glycol methyl ether solution and 0.005molFe(NO 3 ) 3 Mix the ethylene glycol methyl ether solution, stir magnetically at room temperature for 30 minutes, add 0.01 mol of melamine, dissolve evenly, heat and stir until it is in the form of a sol, transfer the sample in the form of a sol to an oven for 24 hours to dry at 90°C, and obtain a gel. Grind the gel into powder and transfer it to a muffle furnace for calcination at 550°C for 4 hours, cool to room temperature, and grind to obtain a sample. Weigh 0.100g of the above-mentioned catalyst, add it to 100mL of bisphenol A organic pollutants with an initial concentration of 10mg / L, and carry out photodegradation after 40 minutes of dark reaction. The power of the light source i...

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Abstract

The invention discloses preparation and an application of a composite photocatalyst g-C3N4-BiFeO3 for efficiently removing persistent organic pollutants. The method adopts a sol-gel method for synthesis, and the g-C3N4-BiFeO3 composite photocatalyst is synthesized by one step with the sol-gel method. A xenon lamp is taken as a light source, BPA which is the persistent organic pollutant in the environment is taken as a photodegradation model, and a composite material and a BPA solution are mixed sufficiently for photocatalytic degradation and simulation of the BPA persistent organic pollutant in the water environment. The invention provides a method for efficiently removing the BPA in the water environment, more than 90% of the BPA in the water environment is removed within 2 hours with the method, the concentration is 10 mg / L, the performance is stable, the g-C3N4-BiFeO3 composite photocatalyst is synthesized successfully by one step for the first time, and the preparation and the application has great significance and development prospects in sewage treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a composite photocatalyst g-C for efficiently removing refractory organic pollutants 3 N 4 - Preparation and application of bismuth ferrite. Background technique [0002] In recent years, environmental pollution has seriously affected people's daily life, so how to effectively eliminate organic pollutants harmful to humans has become the focus of attention of the scientific community. Traditional treatment methods are not only ineffective, but also not environmentally friendly, and are likely to cause secondary pollution to the environment. Photocatalytic technology has shown great application potential in solving environmental pollution problems. Moreover, due to the semiconductor photocatalytic technology itself has many advantages, such as: cheap, non-toxic, low energy consumption and so on. Therefore, this technique has been extensively studied. [0003] Bismuth f...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/10C02F1/72C02F1/30C02F101/34
Inventor 涂新满周仁韬罗胜联代威力罗旭彪
Owner NANCHANG HANGKONG UNIVERSITY
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