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A rare-earth co-doped bivo with upconversion properties 4 Photocatalyst and its preparation method and application

A technology of conversion characteristics and photocatalysts, applied in the direction of light water/sewage treatment, etc., can solve the problems that have not been seen, and achieve the effects of improving photocatalytic activity, improving photocatalytic reaction efficiency, and excellent degradation activity.

Active Publication Date: 2017-12-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no one-step rapid synthesis of rare earth co-doped BiVO with upconversion characteristics by microwave hydrothermal method. 4 Related reports on photocatalysts

Method used

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  • A rare-earth co-doped bivo with upconversion properties <sub>4</sub> Photocatalyst and its preparation method and application
  • A rare-earth co-doped bivo with upconversion properties <sub>4</sub> Photocatalyst and its preparation method and application
  • A rare-earth co-doped bivo with upconversion properties <sub>4</sub> Photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, and stirred on a magnetic stirrer for 25 minutes to prepare a mother solution A with a concentration of 0.4mol / L; 4 VO 3 Dissolve in deionized water at 100°C, heat and stir on a magnetic stirrer at 90°C for 25 minutes, and prepare mother liquor B with a concentration of 0.4mol / L;

[0032] Step 2: Add mother liquor B to mother liquor A according to the molar ratio of Bi and V of 1:1, and stir on a magnetic stirrer for 20 minutes to obtain a mixed liquor; then use NaOH solution with a concentration of 5mol / L at 0.5mL / min Add it dropwise into the mixture at a speed of 100°C, adjust the pH value of the mixture to 8, and then stir on a magnetic stirrer for 20 minutes;

[0033] Step 3: Add Nd(NO 3 ) 3 ·6H 2 O was added to the mixed solution after adjusting the pH value, magnetically stirred for 30min, and then Er(NO 3 ) 3 ·6H 2 O, magnetically stirred for 30min, and was prepared as a precursor solution, w...

Embodiment 2

[0037] Step 1: Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, and stirred on a magnetic stirrer for 25 minutes to prepare a mother solution A with a concentration of 0.4mol / L; 4 VO 3 Dissolve in deionized water at 100°C, heat and stir at 90°C on a magnetic stirrer for 25 minutes, and prepare mother liquor B with a concentration of 0.4mol / L;

[0038] Step 2: Add mother liquor B to mother liquor A according to the molar ratio of Bi and V of 1:1, and stir on a magnetic stirrer for 20 minutes to obtain a mixed liquor; then use NaOH solution with a concentration of 5mol / L at 0.5mL / min Add it dropwise to the mixed solution, adjust the pH value of the mixed solution to 8, and stir on a magnetic stirrer for 20 minutes;

[0039] Step 3: Add Nd(NO 3 ) 3 ·6H 2 O was added to the mixed solution after adjusting the pH value, stirred by magnetic force for 30min, and then Er(NO 3 ) 3 ·6H 2 O was then added to the mixture, and stirred magnetically for 30 minutes to prepare a ...

Embodiment 3

[0043] Step 1: Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, and stirred on a magnetic stirrer for 25 minutes to prepare a mother solution A with a concentration of 0.4mol / L; 4 VO 3 Dissolve in deionized water at 100°C, heat and stir on a magnetic stirrer at 90°C for 25 minutes, and prepare mother liquor B with a concentration of 0.4mol / L;

[0044] Step 2: Add mother liquor B to mother liquor A according to the molar ratio of Bi and V of 1:1, stir on a magnetic stirrer for 20 minutes to obtain a mixed liquor; Add it dropwise to the mixed solution, adjust the pH value of the mixed solution to 8, and stir on a magnetic stirrer for 20 minutes;

[0045] Step 3: Add Nd(NO 3 ) 3 ·6H 2 O was added to the mixed solution after adjusting the pH value, magnetically stirred for 30min, and then Er(NO 3 ) 3 ·6H 2 O was then added to the mixture, and magnetically stirred for 30 minutes to prepare a precursor solution, wherein the molar ratio of Nd to Bi was 6.38:100, the mo...

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Abstract

The invention relates to a rare earth co-doped BiVO4 photocatalyst with upconversion characteristic and a preparing method and application thereof. The preparing method includes the steps that bismuth nitrate pentahydrate and ammonium metavanadate are dissolved in water to prepare mother liquor A and mother liquor B, the mother liquor B is added into the mother liquor A by the molar ratio of Bi:V=1:1 to obtain mixed liquor, the pH value of the mixed liquor is adjusted to be 8, two kinds of rare earth nitrate are sequentially added into the mixed liquor, the molar ratio of total amount of the two rare earth elements: bismuth=(10.52-10.55):100, and finally the rare earth co-doped BiVO4 photocatalyst with upconversion characteristic is prepared through a microwave hydrothermal method in a heat preservation mode. The microwave hydrothermal synthesis technology is adopted for fast synthesizing the rare earth co-doped BiVO4 photocatalyst with high degradation activity and upconversion characteristic, the rare earth co-doped BiVO4 photocatalyst has excellent degradation activity under simulated sunlight, the photocatalysis efficiency of pure-phase BiVO4 powder is greatly improved, and the rare earth co-doped BiVO4 photocatalyst has wide application prospects.

Description

technical field [0001] The invention belongs to the field of functional materials, in particular to a rare earth co-doped BiVO with up-conversion properties 4 Photocatalyst and its preparation method and application. Background technique [0002] Bismuth vanadate (BiVO 4 ) As a widely studied semiconductor photocatalyst, it mainly has three crystal forms: tetragonal zircon, monoclinic scheelite and tetragonal scheelite. Among them, monoclinic phase BiVO 4 The visible light photocatalytic activity is the best, but its low photon yield, poor surface adsorption capacity and other factors still restrict its practical application. Currently, for BiVO 4 There are many researches on the modification of semiconductor photocatalysts, such as metal and non-metal doping, semiconductor recombination, surface photosensitization, etc. These modification technologies have broadened the scope of BiVO to some extent. 4 However, the reactivity of electrons and holes excited by visible li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22C02F1/30
Inventor 谈国强罗洋洋董国华刘婷任慧君夏傲王通
Owner SHAANXI UNIV OF SCI & TECH
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