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Photocatalytic composite material with p-n heterojunction, and preparation method and application thereof

A composite material and photocatalytic technology, which is applied in the field of photocatalytic composite materials and their preparation, and can solve the problems of large band gap energy and limited application.

Active Publication Date: 2018-11-30
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, BiOCl has a large band gap energy (3.2eV ~ 3.6eV), and it can only absorb ultraviolet light, which limits its practical application.

Method used

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  • Photocatalytic composite material with p-n heterojunction, and preparation method and application thereof
  • Photocatalytic composite material with p-n heterojunction, and preparation method and application thereof
  • Photocatalytic composite material with p-n heterojunction, and preparation method and application thereof

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preparation example Construction

[0030] The invention provides a method for preparing a photocatalytic composite material with a p-n heterojunction, comprising the following steps:

[0031] (1) Sodium bismuthate is mixed with water for hydrothermal reaction to obtain m-Bi 2 o 4 ;

[0032] (2) m-Bi obtained by the step (1) 2 o 4 Dispersed in dispersant to get m-Bi 2 o 4 Dispersions;

[0033] (3) under the condition that the pH value is 1~3, the m-Bi obtained in the step (2) 2 o 4 The dispersion liquid is mixed with a chlorine source and then ultrasonically treated to obtain a photocatalytic composite material with a p-n heterojunction.

[0034] In the present invention, sodium bismuthate is mixed with water for hydrothermal reaction to obtain m-Bi 2 o 4 . In the present invention, the volume ratio of the mass of sodium bismuthate to water is preferably 1-3g:30-90mL, more preferably 2g:60mL.

[0035] The present invention has no special limitation on the mixing method, and a mixing method well known t...

Embodiment 1

[0056] Weigh 1g of sodium bismuthate and disperse it in 30mL of pure water, stir at room temperature for 0.5h, then pour it into a reaction kettle for hydrothermal reaction at 130°C for 16h, cool to room temperature naturally, filter, wash, and dry at 70°C for 10h to obtain m-Bi 2 o 4 .

[0057] Weigh 0.482g of m-Bi 2 o 4 Disperse in 10 mL of absolute ethanol, drop into 1 mL of 1M HCl solution drop by drop, stir magnetically for 3 hours at room temperature, ultrasonic for 1 hour, wash with pure water 5 times, and dry at 50°C for 16 hours to obtain a p-n heterojunction Photocatalytic composites.

[0058] figure 1 as a single catalyst m-Bi 2 o 4 , BiOCl and the photocatalytic composite material m-Bi that embodiment 1 makes 2 o 4 XRD pattern of / BiOCl. Such as figure 1 As shown, monomers and complexes correspond to the diffraction peaks of standard cards, indicating that the materials were successfully synthesized.

[0059] figure 2 as a single catalyst m-Bi 2 o 4...

Embodiment 2

[0077] Weigh 2g of sodium bismuthate and disperse it in 60mL of pure water, stir at room temperature for 1h, then pour it into a reaction kettle for hydrothermal reaction at 160°C for 14h, cool to room temperature naturally, filter, wash, and dry at 60°C for 15h to obtain m -Bi 2 o 4 .

[0078] Weigh 0.964g of m-Bi 2 o 4 Disperse in 20 mL of pure water, add 0.116 g of sodium chloride, and add dilute nitric acid to adjust pH=1. Stir magnetically for 3.5 hours at room temperature and sonicate for 1.5 hours. After washing with pure water for 4 times, drying at 60°C for 12 hours, a photocatalytic composite material with p-n heterojunction was obtained.

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Abstract

The invention provides a photocatalytic composite material with p-n heterojunction, and belongs to the field of organic pollutant treatment. The narrow-band-gap photocatalytic composite material withp-n heterojunction disclosed by the invention improves deficiency of a single catalyst, has a small band gap energy (1.87 eV), has a large absorption threshold on visible light, and has enhanced lightutilization efficiency. The p-n heterojunction caused by bending of the energy band increases the hole transfer ability, inhibits electron-hole recombination, improves the separation efficiency of photogenerated electrons and holes, prolongs the carrier lifetime and enhances the catalytic activity. Under visible light, the photocatalytic composite material has good degradation effects on organicpollutants in water, such as MO, MG, BPA, tetracycline hydrochloride, etc. At the same time, the narrow-band-gap photocatalytic composite material with p-n heterojunction disclosed by the invention can settle in water through standing, so that the narrow-band-gap photocatalytic composite material can be separated from an aqueous solution, and thus the narrow-band-gap photocatalytic composite material is beneficial to recovery and reuse of materials, has good regenerative capacity and can be recycled.

Description

technical field [0001] The invention relates to the technical field of organic pollutant treatment, in particular to a photocatalytic composite material with a p-n heterojunction and a preparation method and application thereof. Background technique [0002] Dye wastewater is one of the harmful industrial wastewater, mainly from industries such as textile dyeing, paper printing, color photography and petroleum industry. The total amount of dye wastewater is constantly increasing, and every ton of wastewater discharged will pollute 20 tons of water. Most of the organic matter in wastewater is based on aromatic rings and heterocyclic rings, and has chromogenic groups, which makes the wastewater highly chromatic and highly polluting. It usually also contains halides, nitros, anilines and A series of organic compounds such as phenols and some inorganic salts such as sodium chloride, sodium sulfate and sulfide. A large amount of dye wastewater is discharged into the environment...

Claims

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Application Information

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IPC IPC(8): B01J27/10C02F1/30C02F101/30
CPCC02F1/30B01J27/10C02F2101/308C02F2305/10B01J35/39
Inventor 郭永福王隽秀程娟张振宗黄天寅
Owner SUZHOU UNIV OF SCI & TECH
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