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Bismuth-based modified photocatalyst and preparation method and application thereof

A photocatalyst and modification technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of high Ag content and expensive catalyst cost, and achieve simple preparation methods and visible light utilization high rate effect

Inactive Publication Date: 2015-11-18
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, silver-based catalysts have attracted widespread attention from researchers, and have good absorption of visible light, but the content of Ag is high, and the cost of the catalyst is expensive.

Method used

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  • Bismuth-based modified photocatalyst and preparation method and application thereof
  • Bismuth-based modified photocatalyst and preparation method and application thereof
  • Bismuth-based modified photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Photocatalyst AgI-RGO / α-Bi 2 o 3 -The preparation method of BiOI, the steps are as follows:

[0058] (1) Preparation of α-Bi 2 o 3 : Spread 3g of bismuth nitrate (pentahydrate) evenly on the bottom of the crucible to form a thin layer, heat up to 500°C at 5°C / min, and calcine at constant temperature for 3h.

[0059] (2) Take 1g of α-Bi 2 o 3 Dissolve in 50mL water, ultrasonically disperse for 60min to form a suspension, add 0.3562g KI solid to react, and stir for 60min;

[0060] (3) Add 0.0722 g of silver nitrate solid to the above solution, fully dissolve the reaction, stir for 60 min; then add 5 mg of graphene oxide (GO), ultrasonically disperse for 60 min, and stir for 60 min;

[0061] (4) Add 0.1mL of N 2 h 4 ·H 2 O, 80°C water bath for 10min, after the reaction, the suspension was washed 4 times with water, centrifuged, the supernatant was discarded, dried, and ground to obtain AgI-RGO / α-Bi 2 o 3 -BiOI.

[0062] Wherein, the preparation of graphene oxid...

Embodiment 2

[0067] In 50mL of chromium-containing wastewater (Cr(VI) concentration 20.35mg / L), add 50mg of photocatalyst, do not adjust the pH, stir in the dark for 30min to adsorption equilibrium, fix the position of the light source, turn on the visible light source, and react for 75min. Photogenerated electrons reduce Cr(VI) to Cr(III), which is 100 times less toxic and prone to coordination precipitation.

[0068] Wherein the photocatalyst adopts the photocatalyst α-Bi prepared by embodiment 1 2 o 3 , α-Bi 2 o 3 -BiOI, AgI-RGO / α-Bi 2 o 3 -BiOI, to compare the effect of reducing Cr(VI), the results are as follows figure 2 .

[0069]Under the same conditions, the modified AgI-RGO / α-Bi 2 o 3 -BiOI vs α-Bi 2 o 3 , α-Bi 2 o 3 -The effect of reducing Cr(VI) by BiOI has been improved to varying degrees. Within 45min, AgI-RGO / α-Bi 2 o 3 -BiOI significantly accelerated the removal rate of Cr(VI). After 75min, AgI-RGO / α-Bi 2 o 3 -BiOI removal rate for Cr(VI), relative to α-Bi ...

Embodiment 3

[0071] Take 0.1g of prepared catalyst α-Bi 2 o 3 and AgI-RGO / α-Bi 2 o 3 -BiOI was dissolved in 0.5mL ethylene glycol, ultrasonically dispersed for 30min, drop-coated on conductive glass (FTO) (6cm*1cm), the size of drop-coating was 1cm*1cm, coated twice, 20μL each time, vacuum-dried at 80°C , to produce α-Bi 2 o 3 and AgI-RGO / α-Bi 2 o 3 -BiOI photocatalytic electrode.

[0072] Place the above electrodes in Na with a concentration of 0.5mol / L 2 SO 4 In the solution, under the 3-electrode system of the electrochemical workstation, the above electrode was used as the working electrode, the platinum sheet was used as the counter electrode, and the silver electrode was used as the reference electrode, and the flat band potential of the catalyst was measured in the dark. The parameters are: the amplitude is 5mV, and the frequency is 500, 1000, 3000Hz respectively.

[0073] Figure 3(a) and Figure 3(b) are α-Bi 2 o 3 and AgI-RGO / α-Bi 2 o 3 - Flat band potential map of Bi...

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Abstract

The invention discloses a bismuth-based modified photocatalyst and a preparation method and an application of the bismuth-based modified photocatalyst. The preparation method comprises the following steps: (1) dissolving alpha-Bi2O3 in water, carrying out ultrasonic dispersion to form suspension liquid, adding solid KI for reaction, and carrying out magnetic stirring to obtain reaction liquid; (2) adding silver nitrate solid to the reaction liquid obtained in step (1), and carrying out magnetic stirring for reaction; after the reaction is completed, adding graphene oxide, and sequentially carrying out ultrasonic dispersion and stirring; and (3) adding N2H4.H2O to the solution obtained after stirring in step (2), carrying out water-bath reaction to obtain turbid liquid, carrying out washing and centrifugation on the obtained turbid liquid, taking precipitate, and grinding the precipitate after drying to obtain the bismuth-based modified photocatalyst. The prepared photocatalyst is used in the treatment of chromium-containing wastewater and generates reaction under the irradiation of visible light without adjusting the pH value. The preparation method of the photocatalyst disclosed by the invention is simple, the photo-induced electron and hole separation effect is good, the photocurrent is high, and the effect of treatment for the chromium-containing wastewater is good, secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to the technical field of visible light-responsive photocatalytic materials, in particular to a bismuth-based modified photocatalyst and its preparation method and application. Background technique [0002] In recent years, my country's water pollution has intensified, and heavy metal pollution incidents have become more frequent. Incidents such as "arsenic poisoning", "blood lead", and "cadmium rice" have occurred frequently, and effective prevention and control of them is imminent. Currently widely implemented physical and chemical methods such as reduction precipitation method, chemical flocculation method, ion exchange method, and membrane filtration method have defects such as high residue, high cost, secondary pollution, and low removal rate of coexisting organic matter. [0003] For example, for the treatment of chromium-containing wastewater, the Chinese inv...

Claims

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Application Information

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IPC IPC(8): B01J27/08C02F1/30C02F1/70C02F1/62
Inventor 王齐石晓东许剑佳刘恩秦丛燕青张轶
Owner ZHEJIANG GONGSHANG UNIVERSITY
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