Bismuth oxyhalide/calcium bismuthate composite material based on fto surface, preparation method and application of dyes in photocatalytic degradation of water

A composite material, bismuth oxyhalide technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low separation rate of photogenerated carriers, poor photochemical conversion efficiency, limited applications, etc. problem, to achieve good application prospects, excellent visible light catalytic pollutant degradation performance and structural stability.

Active Publication Date: 2021-07-02
HENAN INST OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Single-component catalysts have problems such as low photogenerated carrier separation rate and photoresponse range, which lead to poor photochemical conversion efficiency and limit their application in photocatalysis.

Method used

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  • Bismuth oxyhalide/calcium bismuthate composite material based on fto surface, preparation method and application of dyes in photocatalytic degradation of water
  • Bismuth oxyhalide/calcium bismuthate composite material based on fto surface, preparation method and application of dyes in photocatalytic degradation of water
  • Bismuth oxyhalide/calcium bismuthate composite material based on fto surface, preparation method and application of dyes in photocatalytic degradation of water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A BiOX / CaBi 6 o 10 (X=1) the preparation method of composite material, it may further comprise the steps:

[0031] 1) Pretreatment of FTO conductive glass: Soak 2×2 cm FTO conductive glass (square resistance <8Ω) in ethanol and deionized water respectively, after ultrasonic cleaning for 30 minutes, blow dry with nitrogen, and place it under a 150W long-arc mercury lamp After irradiating for 180 min, take it out for use;

[0032] 2) CaBi 6 o 10 Material: Weigh 8.9g Bi(NO 3 ) 3 ·5H 2 O, 0.6g Ca(NO 3 ) 2 , 1.0g diethylenetriaminepentaacetic acid (DTPA), 0.3g ethylenediaminetetraacetic acid (EDTA) were added to 35mL HNO 3 solution (0.1 mol / L), stirred for 1 hour to fully dissolve it, and obtained solution A. Take 20 microliters of solution A and drop it on the surface of the FTO conductive glass obtained in step 1), and spin coat it evenly at a speed of 800rpm for 20s through a homogenizer, and then add 20 microliters of 0.2 mol / L ammonia water for 20s at a speed ...

Embodiment 2

[0035] A BiOX / CaBi 6 o 10 (X=1) the preparation method of composite material, it may further comprise the steps:

[0036] 1) With reference to steps 1-2 of Example 1, CaBi was obtained 6 o 10 Material;

[0037] 2) Referring to step 3) of Example 1, the concentration of KI solution in the reactor was 25mmol / L to obtain BiOX / CaBi 6 o 10 (X=I) composite material, denoted as BiOI / CaBi 6 o 10 -2.

Embodiment 3

[0039] A BiOX / CaBi 6 o 10 (X=Br) the preparation method of composite material, it comprises the steps:

[0040] 1) Pretreatment of FTO conductive glass: Soak 2×2 cm FTO conductive glass (square resistance <8Ω) in ethanol and deionized water respectively, after ultrasonic cleaning for 30 minutes, blow dry with nitrogen, and place it under a 150W long-arc mercury lamp After irradiating for 180 min, take it out for use;

[0041] 2) CaBi 6 o 10 Material: Weigh 8.9g Bi(NO 3 ) 3 ·5H 2 O, 0.6g Ca(NO 3 ) 2 , 1.0g diethylenetriaminepentaacetic acid (DTPA), 0.3g ethylenediaminetetraacetic acid (EDTA) were added to 35mL HNO 3 solution (0.1 mol / L), stirred for 1 hour to fully dissolve it, and obtained solution A. Take 20 microliters of solution A and add it dropwise on the surface of the FTO conductive glass obtained in step 1), and spin coat it evenly at a speed of 800rpm for 20s through a homogenizer, then add 20 microliters of 0.2 mol / L ammonia water dropwise at a speed of 80...

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Abstract

The invention relates to a method for preparing a bismuth oxyhalide / calcium bismuthate composite material based on an FTO surface, specifically: 1) using bismuth nitrate and calcium nitrate as raw materials, and using diethylenetriaminepentaacetic acid and ethylenediaminetetraacetic acid as raw materials Appearance control agent, by cross-spin coating with ammonia solution, the precursor is dispersed on the surface of FTO, and then calcined to obtain flaky CaBi 6 o 10 Materials; 2) Bismuth nitrate aqueous solution was dispersed in CaBi by spin coating 6 o 10 On the surface of the material, after a low-temperature heat preservation reaction, the material is placed in a 10-40mmol / L KX solution (X=Cl, Br, I), reacted at 160-180°C for 8-15 hours, washed and dried to obtain BiOX / CaBi 6 o 10 composite material. The composite material has low cost, high activity of photocatalytic pollutants, stable structure and good cycle stability, and it also shows good photocatalytic degradation ability for various mixed pollutants. Wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation and photocatalytic degradation, in particular to a bismuth oxyhalide / calcium bismuthate BiOX / CaBi based on the surface of FTO 6 o 10 (X=Cl, Br, I) composite material, preparation method and its application in photocatalytic degradation of dyes in water. Background technique [0002] With the rapid development of industry, the living environment of human beings is gradually deteriorating. The massive discharge of refractory pollutants such as dyes, halogenated hydrocarbons, heterocyclic compounds, phenols, surfactants, pesticides, etc. has caused serious pollution to water resources. Traditional pollutant treatment methods are difficult to completely mineralize these pollutants, but such operations usually bring secondary pollution. Semiconductor photocatalytic oxidation technology can non-selectively treat multiple pollutants at the same time, and has a wide range of appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/138B01J37/08C02F1/30C02F101/34C02F101/38C02F101/30
Inventor 王吉超史维娜郭晓伟李英侯玉霞刘露冯富东韩维航常青超
Owner HENAN INST OF SCI & TECH
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