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A kind of composite photocatalytic material and its preparation method and application

A technology of composite photocatalysis and reactor, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem of difficult to generate active free radicals and narrow band gap , Unfavorable photogenerated electron-hole pair separation and other issues, to achieve the effect of improving efficiency, high separation efficiency, and high photothermal conversion efficiency

Active Publication Date: 2021-09-24
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently in the field of photocatalysis, these two aspects of research are integrated. Researchers are either exploring photocatalytic materials that efficiently use sunlight to achieve interface evaporation, or studying photocatalytic materials with high electron-hole pair separation efficiency under visible light. catalytic materials, while few studies have reported a photocatalytic material capable of simultaneous interfacial water evaporation and pollutant degradation
Efficient interfacial water evaporation usually has two requirements for semiconductor photocatalytic materials: on the one hand, the material has a large photoresponse range (absorbing most wavelengths of sunlight) and high photothermal conversion efficiency, but a large photoresponse range usually means The band gap is narrow, which is not conducive to the separation of photogenerated electron-hole pairs, so it is difficult to generate sufficient active radicals (such as O 2 - , OH and holes, etc.)
On the other hand, the interfacial water evaporation material needs to have hydrophobic properties, and the gap between the material surface and water molecules formed thereby can promote evaporation, but the hydrophobicity of the material makes it difficult for pollutants in the water to fully contact with the free radicals generated on the material surface
These two reasons limit the ability of semiconductor photocatalytic materials to oxidize pollutants in water through the active free radicals generated during the interfacial water evaporation process.

Method used

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  • A kind of composite photocatalytic material and its preparation method and application
  • A kind of composite photocatalytic material and its preparation method and application
  • A kind of composite photocatalytic material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Mix 0.5g metal molybdenum powder with 7.5mL hydrogen peroxide (30%), ultrasonic for 4h; dilute the above solution to 40mL with deionized water, add 3g chitosan, ultrasonically disperse to form a uniform turbid liquid, and transfer to the reaction kettle reacted at 180°C for 8h; the solid product obtained by filtering the reactor was washed and dried to obtain MoO 3-x -QD; Take 20mg MoO 3-x -QD mixed in 0.8~1.0mmol·L -1 Sodium dodecylbenzenesulfonate (SDBS) solution, ultrasonically transferred to the reaction kettle for 2 hours at 80 ° C, the solid in the reaction kettle was washed and dried to obtain hydrophilic molybdenum oxide quantum with oxygen defects Dot (H-MoO 3-x -QD); take 2mgH-MoO 3-x -QD added 100mL concentration is 0.2mmolL -1 In the SDBS solution, magnetically stirred for 24 hours to obtain a mixed solution A. The above mixed solution A was passed through CA with a pore size of 0.45 μm, and was repeatedly washed with deionized water until the filtrate w...

Embodiment 2

[0046] Get 2.0g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), 0.32g potassium chloride (KCl) and 0.36g sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) was dissolved in 80mL deionized water to obtain a mixed solution B, which was placed in a reaction kettle and reacted at 180°C for 8 hours; after the reaction, the product was dried and washed to obtain a white material BiOCl; 1g of white BiOCl and 0.8 g Fe powder was mixed in 100mL deionized water, ultrasonicated for 4h, unreacted Fe powder was removed with a magnetic field and excess dilute hydrochloric acid, and then washed with deionized water to obtain B-BiOCl; the above dried B-BiOCl was loaded onto CA (The loading method is: dissolve B-BiOCl in water, pass the B-BiOCl aqueous solution through CA with a pore size of 0.45 μm, and then repeatedly rinse with deionized water until the filtrate is neutral), place the CA membrane in a vacuum dryer, and use 300 μL of fluorosilane was modified to obtain a free-floating HB-Bi...

Embodiment 3

[0048] Add 2mg of CNTs to 100mL to a concentration of 0.2mmol·L -1 The SDBS solution was magnetically stirred for 24 hours, the above mixture was passed through 0.45 μm CA, and washed repeatedly with deionized water until the filtrate was neutral. The obtained photocatalytic film was placed in a vacuum dryer and modified with 300 μL of fluorosilane to obtain a free-floating H-CNTs / CA photocatalytic material.

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Abstract

The invention discloses a H-MoO 3‑x ‑QD / HB‑BiOCl / H‑CNTs / CA composite photocatalytic material, which is obtained by loading a composite photocatalyst on a cellulose acetate membrane (CA), the color of the composite photocatalyst is black, It consists of molybdenum oxide quantum dots (MoO 3‑x ‑QD), bismuth oxychloride (BiOCl) and carbon nanotubes (CNTs), three components of molybdenum oxide quantum dots (MoO 3‑x ‑QD), bismuth oxychloride (BiOCl), and carbon nanotubes (CNTs) are hydrophilic, hydrophobic, and hydrophilic, respectively. The present invention also discloses the above-mentioned H-MoO 3‑x The preparation method of ‑QD / HB‑BiOCl / H‑CNTs / CA composite photocatalytic materials and the principle of efficient evaporation of water and degradation of organic pollutants at the same time.

Description

technical field [0001] The present invention relates to a kind of H-MoO 3-x - QD / HB-BiOCl / H-CNTs / CA composite photocatalytic materials, also related to the aforementioned H-MoO 3-x - A preparation method and application of a QD / HB-BiOCl / H-CNTs / CA composite photocatalytic material, belonging to the technical field of photocatalysts. Background technique [0002] The rapid development of modern society and the increasing energy consumption have caused serious environmental problems, and water pollution, as one of the most representative environmental problems, is particularly serious. Among the 196 countries in the world, more than 100 countries are short of water, and more than 20 of them are seriously short of water. However, the dumping of domestic garbage, the arbitrary discharge of domestic sewage and the substandard discharge of industrial wastewater have caused the pollution of natural water bodies, which further aggravates the problem of shortage of clean water resou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/34B01J35/06C02F1/14C02F1/30C02F101/38C02F101/36
CPCC02F1/14C02F1/30B01J31/34C02F2305/10C02F2101/40C02F2101/36C02F2101/38B01J35/39B01J35/59Y02A20/212
Inventor 杨汉培高照陆玮吴强顺康丽曹洋吴俊明
Owner HOHAI UNIV