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A kind of agi/β-bi2o3-bi2o2co3 photocatalyst and its preparation method and application

A photocatalyst, 3·5H2O technology, used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as lack of stability, and achieve accelerated electron transfer, performance optimization, and improved visible light. The effect of the response

Active Publication Date: 2018-03-09
浙江海宁经编产业园区开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, as a photosensitive material, AgI has a high response to visible light, but it lacks stability under light conditions.

Method used

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  • A kind of agi/β-bi2o3-bi2o2co3 photocatalyst and its preparation method and application
  • A kind of agi/β-bi2o3-bi2o2co3 photocatalyst and its preparation method and application
  • A kind of agi/β-bi2o3-bi2o2co3 photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Bi 2 o 2 CO 3 Preparation of photocatalyst:

[0062] (1) 1.456g Bi(NO 3 ) 3 ·5H 2 O, added to 1mol / L HNO 3 (60mL), stirred until completely dissolved;

[0063] (2) Add 0.288g citric acid to dissolve;

[0064] (3) adjust the pH of the solution to 6 with 10mol / L NaOH;

[0065] (4) Hydrothermal reaction at 180°C for 24 hours;

[0066] (5) Centrifuge, wash twice with absolute ethanol, wash three times with distilled water, dry at 80°C, and grind to obtain Bi 2 o 2 CO 3 .

[0067] (2) β-Bi 2 o 3 -Bi 2 o 2 CO 3 The preparation of photocatalyst, the steps are as follows:

[0068] The Bi prepared in (1) 2 o 2 CO 3 The prepared one was placed in a muffle furnace and calcined at 300°C for 120 minutes to obtain β-Bi 2 o 3 -Bi 2 o 2 CO 3 .

[0069] (3) AgI / Bi 2 o 2 CO 3 The preparation of photocatalyst, the steps are as follows:

[0070] (1) 0.0167g AgNO 3 Dissolve in distilled water, add 1g Bi 2 o 2 CO 3 Stir for 10 minutes;

[0071] (2) Dis...

Embodiment 2

[0078] With the photocatalyst Bi prepared in embodiment 1 2 o 2 CO 3 , β-Bi 2 o 3 -Bi 2 o 2 CO 3 , AgI / Bi 2 o 2 CO 3 , AgI / β-Bi 2 o 3 -Bi 2 o 2 CO 3 Perform UV-Vis diffuse reflectance scanning to obtain UV-vis-DRS comparison figure 2 .

[0079] like figure 2 , Bi 2 o 2 CO 3 Absorption is very weak in the visible range, almost all concentrated in the ultraviolet region. After calcination, β-Bi 2 o 3 -Bi 2 o 2 CO 3 Enhanced response to visible light. AgI / Bi 2 o 2 CO 3 The absorption of visible light is also somewhat improved, especially around the wavelength of 420nm. AgI / β-Bi 2 o 3 -Bi 2 o 2 CO 3 It has a strong response in the whole spectrum, especially in the visible light range, and its absorption of visible light is greatly improved, which shows that the catalyst has strong visible light activity.

Embodiment 3

[0081] In the reactor, adding volume is 50mL, concentration 10mg / L contains p-nitroaniline (4-NA) waste water, adds the AgI / β-Bi of 50mg 2 o 3 -Bi 2 o 2 CO 3 Visible light catalyst, keep stirring, stir in the dark for 30 minutes to adsorption equilibrium, turn on the visible light source, take samples at intervals of 15 minutes, and the reaction time is 5 hours.

[0082] Change photocatalyst to be the photocatalyst Bi that embodiment 1 prepares 2 o 2 CO 3 , β-Bi 2 o 3 -Bi 2 o 2 CO 3 , AgI / Bi 2 o 2 CO 3 , Carry out the effect comparison of degrading p-nitroaniline, the result is as follows image 3 and Table 1.

[0083] like image 3 , under the same conditions, β-Bi 2 o 3 -Bi 2 o 2 CO 3 The effect of degrading p-nitroaniline and Bi 2 o 2 CO 3 Little difference. AgI / Bi prepared by modification 2 o 2 CO 3 , AgI / β-Bi 2 o 3 -Bi 2 o 2 CO 3 Relative to Bi 2 o 2 CO 3 , the effect of degrading p-nitroaniline has been greatly improved. 5 hours later...

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Abstract

The invention discloses an AgI / β-Bi2O3-Bi2O2CO3 photocatalyst and its preparation method and application. The preparation method comprises: (1) dissolving Bi(NO3)3·5H2O in HNO3, then adding citric acid, and then adjusting the pH After reaching weak acidity, carry out hydrothermal reaction. After the reaction, centrifuge to collect the precipitate, and obtain Bi2O2CO3 after washing, drying and grinding; (2) Disperse Bi2O2CO3 in the aqueous solution of AgNO3, and then add KI solution drop by drop, and the reaction ends After centrifugation, drying and grinding, AgI / Bi2O2CO3 is obtained; (3) AgI / Bi2O2CO3 is calcined at a constant temperature to obtain AgI / β-Bi2O3-Bi2O2CO3 photocatalyst. The photocatalyst of the invention has simple preparation method, low cost, improved visible light response degree, good photocatalytic performance, treatment of p-nitroaniline-containing waste water, and no secondary pollution.

Description

technical field [0001] The present invention relates to the technical field of photocatalytic materials, especially the technical field of visible light catalytic materials, in particular to an AgI / β-Bi 2 o 3 -Bi 2 o 2 CO 3 Preparation method of photocatalyst and its application. Background technique [0002] Photocatalytic materials have been widely studied in recent years because they can use sunlight to degrade organic pollutants, reduce heavy metals, and can be recycled. TiO 2 For example, with a wide band gap, it can only absorb ultraviolet light, which accounts for less than 5% of solar energy, and has a low utilization rate of solar energy. Therefore, it is necessary to study and develop photocatalysts with high visible light response. [0003] For example, the Chinese invention patent application document with publication number CN 102962078A discloses a photocatalyst responsive to visible light and a preparation method thereof. Analytical pure silver nitrate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/236B01J35/00C02F1/30C02F101/38
CPCY02W10/37
Inventor 王齐石晓东刘恩秦胡含蕾周甜甜
Owner 浙江海宁经编产业园区开发有限公司
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