Monolayer carbon nitride nanoflake and bismuth plasma co-modified bismuth oxide-based electrode as well as preparation method and application thereof

A technology of plasma and nanosheets, applied in chemical instruments and methods, special compound water treatment, physical/chemical process catalysts, etc., can solve the problems of general effect, poor photoresponse performance, and few catalytic reaction active sites, etc., to achieve The treatment effect is good, the preparation method is simple, and the effect of visible light response improvement

Active Publication Date: 2018-03-06
ZHEJIANG GONGSHANG UNIVERSITY
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AI Technical Summary

Problems solved by technology

The graphitic carbon nitride obtained by the traditional direct thermal polymerization method often has small surface area, fewer catalytic reaction active sites, and poor photoresponse performance. These problems restrict the large-scale application of graphitic carbon nitride to some extent.
[0009] The Bi 2 o 3 - The visible light response of BiOI heterojunction still needs to be improved, and the effect of being used alone to degrade phenol is also average, and the stability is not strong at the same time

Method used

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  • Monolayer carbon nitride nanoflake and bismuth plasma co-modified bismuth oxide-based electrode as well as preparation method and application thereof
  • Monolayer carbon nitride nanoflake and bismuth plasma co-modified bismuth oxide-based electrode as well as preparation method and application thereof
  • Monolayer carbon nitride nanoflake and bismuth plasma co-modified bismuth oxide-based electrode as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0055] Taking the optimal preparation method as an example, it includes the following steps:

[0056] (1) Dissolve bismuth nitrate pentahydrate in HNO 3 In the ethylene glycol of (1M), form the bismuth nitrate pentahydrate solution of 0.2M, stir and dissolve at room temperature, obtain clear solution A;

[0057] (2) Take 5g of melamine solid, place it in a crucible and calcinate at 520°C for 2h under air atmosphere to obtain C 3 N 4 solid;

[0058] (3) Weigh 0.5g of C 3 N 4 The solid was placed in 100ml of ethanol solution and ultrasonically stripped for 12 hours to obtain a single layer of C 3 N 4 After centrifugation, take the supernatant as solution B; take 1ml of B turbid solution and add it to 10ml of A solution, stir and disperse evenly to obtain mixed solution C;

[0059] (4) Take 0.02ml of solution C and drop-coat it on the conductive glass (FTO), and dry it in a vacuum oven at 80°C for 2 hours;

[0060] (5) Take out the dried FTO and put it into a muffle furna...

Embodiment 1

[0064] Respectively against Bi 2 o 3 , Bi 2 o 3 -C 3 N 4 , Bi 2 o 3 -BiOI, Bi 2 o 3 -BiOI-C 3 N 4 , Bi@Bi 2 o 3 -BiOI, Bi 2 o 3 -BiOI-C 3 N 4 , Bi@Bi 2 o 3 -BiOI-C 3 N 4 A series of catalytic membranes were tested for the degradation kinetics of chromium-containing phenol wastewater. The concentration of phenol was 5 mg / L, and the concentration of chromium was 80 μmol / L. After the adsorption equilibrium was stirred in the dark, the light source and power supply (2.5V bias voltage) were turned on, and the reaction was carried out for 3 hours.

[0065] The photocatalytic degradation effects of different catalytic films under visible light conditions are as follows: figure 1 and figure 2 shown. To verify Bi@Bi 2 o 3 -BiOI-C 3 N 4 Compared with the photocatalytic performance of the substrate and any binary composite catalyst, the photocatalytic performance has been significantly improved, from figure 1 It can be seen from the data that the five catalyt...

Embodiment 2

[0067] Determination of Bi@Bi by Electrochemical Workstation 2 o 3 -BiOI-C 3 N 4 Photochemical performance test of Bi@Bi 2 o 3 -BiOI-C 3 N 4 The film electrode is the working electrode, the Pt sheet is the counter electrode, the Ag / AgCl is the reference electrode, and the Na 2 SO 4 (0.1mol / L) and Na 2 SO 3 (0.1mol / L) solution is the electrolyte. via Bi@Bi 2 o 3 -BiOI electrodes were scanned to obtain volt-ampere curves. The light source in this experiment was a xenon lamp (500W). Under the condition that the positions of the electrodes and the light source were consistent, scanning of visible light was carried out respectively. And with Bi 2 o 3 , Bi 2 o 3 -C 3 N 4 , Bi 2 o 3 -BiOI, Bi 2 o 3 -BiOI-C 3 N 4 The photocurrents of the electrodes under visible light were compared.

[0068] From image 3 It can be seen that Bi@Bi 2 o 3 -BiOI-C 3 N 4 The photocurrent of the electrode is significantly higher than that of any other electrode.

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Abstract

The invention discloses a monolayer carbon nitride nanoflake and bismuth plasma co-modified bismuth oxide-based electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving bismuth nitrate hexahydrate into ethylene glycol containing HNO3 to obtain a solution A; putting a C3N4 solid into an ethanol solution, carrying out ultrasonic exfoliation to obtain ethanol suspension containing monolayer C3N4, centrifuging and taking supernate as a solution B; adding the solution B into the solution A, performing uniform dispersion anddispensing the mixed solution on conductive glass; carrying out vacuum drying and then calcining to obtain a Bi2O3-C3N4 thin film; then putting the Bi2O3-C3N4 thin film into an acidic KI solution forcarrying out ion exchange, washing and carrying out natural air drying to obtain Bi2O3-BiOI-C3N4; and putting Bi2O3-BiOI-C3N4 into a methanol solution, irradiating with a xenon lamp and taking out thethin film, and carrying out natural air drying to obtain a finished product. A visible light catalytic film with good constructing dispersion, high stability and good photocatalytic effect is constructed. The degrading effect of a photocatalyst on pollutants under the action of visible light is greatly improved while the problem that the photocatalyst is difficult to recover is effectively solved.

Description

technical field [0001] The invention relates to the technical field of photoelectrocatalytic materials, and mainly relates to monolayer C 3 N 4 Co-modified Bi with nanosheets and Bi plasmons 2 o 3 Preparation and application of the base electrode. Background technique [0002] Photocatalytic technology is a kind of advanced oxidation technology, which is a green technology. It only needs to use sunlight to generate photogenerated electrons and holes on the surface of photocatalyst. Electrons can be used for reduction reactions and holes can be used to oxidize organic pollutants. However, photocatalysts are mostly powder catalysts, and recycling and reuse is a big problem. At the same time, most photocatalysts only respond to short-wavelength ultraviolet light, and the catalytic effect is relatively poor. [0003] And photocatalysis, because the catalyst is in the form of a thin film electrode, is better than photocatalysis in terms of recovery. At the same time, due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F1/461C02F101/22C02F101/34
CPCB01J27/24B01J35/0033B01J35/004C02F1/30C02F1/46109C02F2001/46142C02F2101/22C02F2101/345C02F2305/10
Inventor 黄思伟刘恩秦邹紫莹程梦珂王齐
Owner ZHEJIANG GONGSHANG UNIVERSITY
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