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A high active mpg‑c 3 no 4 /re-bivo 4 Heterojunction photocatalyst and its preparation method and application

A technology of mpg-c3n4 and photocatalyst, which can be applied in illumination water/sewage treatment, energy and wastewater treatment, etc., can solve the problems of lack of patents and literature reports, and achieve the effect of improving efficiency, high photocatalytic activity and good application prospects

Active Publication Date: 2018-01-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To date, the preparation of mpg-C 3 N 4 / RE-BiVO 4 The work of heterojunction photocatalysts has not been reported, and there are no patents and literature reports on the preparation of mpg-C 3 N 4 / RE-BiVO 4 heterojunction photocatalyst

Method used

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  • A high active mpg‑c <sub>3</sub> no <sub>4</sub> /re-bivo <sub>4</sub> Heterojunction photocatalyst and its preparation method and application
  • A high active mpg‑c <sub>3</sub> no <sub>4</sub> /re-bivo <sub>4</sub> Heterojunction photocatalyst and its preparation method and application
  • A high active mpg‑c <sub>3</sub> no <sub>4</sub> /re-bivo <sub>4</sub> Heterojunction photocatalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0041] Step 1: Combine the melamine aqueous solution with a concentration of 2.12mol / L and the nano-SiO with a concentration of 0.83mol / L 2 The aqueous solution is mixed and stirred evenly according to the volume ratio of 3:2, dispersed by ultrasonic for 1h, and then stirred evenly and then put into an oven at 80℃ to dry to obtain a white solid, which is ground into a crucible after being finely ground. 2 In an atmosphere furnace, the temperature is increased to 550°C at a rate of 2.5°C / min and the temperature is kept for 4 hours for calcination to obtain a light yellow powder, and then use 4mol / L of NH 4 HF 2 Corrosion in aqueous solution to remove SiO 2 Template, finally washed and dried to get mpg-C 3 N 4 Powder

[0042] Step 2: Convert mpg-C 3 N 4 Add the powder to 15mL ethanol and disperse ultrasonically for 2h to obtain mpg-C 3 N 4 Alcohol solution

[0043] Step 3: Add Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, and stirred on a magnetic stirrer for 20 minutes to obta...

Embodiment 2

[0050] Step 1: Combine the melamine aqueous solution with a concentration of 2.12mol / L and the nano-SiO with a concentration of 0.83mol / L 2 The aqueous solution is mixed and stirred evenly according to the volume ratio of 3:2, dispersed by ultrasonic for 1h, and then stirred evenly and then put into an oven at 80℃ to dry to obtain a white solid, which is ground into a crucible after being finely ground. 2 In an atmosphere furnace, the temperature is increased to 550°C at a rate of 2.5°C / min and the temperature is kept for 4 hours for calcination to obtain a light yellow powder, and then use 4mol / L of NH 4 HF 2 Corrosion in aqueous solution to remove SiO 2 Template, finally washed and dried to get mpg-C 3 N 4 Powder

[0051] Step 2: Convert mpg-C 3 N 4 Add the powder to 15mL ethanol and disperse ultrasonically for 3h to obtain mpg-C 3 N 4 Alcohol solution

[0052] Step 3: Add Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, and stirred on a magnetic stirrer for 20 minutes to obta...

Embodiment 3

[0059] Step 1: Combine the melamine aqueous solution with a concentration of 2.12mol / L and the nano-SiO with a concentration of 0.83mol / L 2 The aqueous solution is mixed and stirred evenly according to the volume ratio of 3:2, dispersed by ultrasonic for 1h, and then stirred evenly and then put into an oven at 80℃ to dry to obtain a white solid, which is ground into a crucible after being finely ground. 2 In an atmosphere furnace, the temperature is increased to 550°C at a rate of 2.5°C / min and the temperature is kept for 4 hours for calcination to obtain a light yellow powder, and then use 4mol / L of NH 4 HF 2 Corrosion in aqueous solution to remove SiO 2 Template, finally washed and dried to get mpg-C 3 N 4 Powder

[0060] Step 2: Convert mpg-C 3 N 4 Add the powder to 15mL ethanol and disperse ultrasonically for 3h to obtain mpg-C 3 N 4 Alcohol solution

[0061] Step 3: Add Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, and stirred on a magnetic stirrer for 20 minutes to obta...

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Abstract

The invention discloses high-activity mpg-C3N4 / RE-BiVO4 heterojunction photocatalyst and a preparation method and application thereof. First, mpg-C3N4 powder is prepared and dispersed into ethyl alcohol; then a bismuth nitrate pentahydrate solution and an ammonium metavanadate solution are mixed, the pH value of the mixture is adjusted, rare earth nitrate is added, and then precursor RE-BiVO4 turbid liquid is obtained; then, an mpg-C3N4 alcoholic solution is added into the precursor RE-BiVO4 turbid liquid to obtain reaction precursor liquid, and finally a microwave hydrothermal method is adopted for preparing the mpg-C3N4 / RE-BiVO4 heterojunction photocatalyst. The catalyst is of a heterojunction structure formed by mesporous mpg-C3N4 and rod-shaped tetragonal zircon phase RE-BiVO4, high photocatalytic activity is achieved under irradiation of simulated sunlight, the photocatalytic efficiency of pure-phase BiVO4 is greatly improved, and good application prospects in the aspect of treating environmental pollutants and others are achieved.

Description

Technical field [0001] The invention belongs to the field of functional materials, and specifically relates to a high activity mpg-C 3 N 4 / RE-BiVO 4 Heterojunction photocatalyst and its preparation method and application. Background technique [0002] With the continuous deepening of industrialization, growing environmental problems have gradually threatened the sustainable development of human society. Semiconductor photocatalysis is a very good choice to solve these environmental problems, because it means that a green way can be used to directly use sunlight to degrade pollutants. Considering that photo-generated carriers play a major role in the photocatalysis process, a photocatalyst with high activity should have a relatively wide spectral absorption range and a very high quantum yield. Combining two kinds of narrow band gap semiconductors with matching energy bands, the transfer of photogenerated carriers between the two compound semiconductors will increase the quantum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30
CPCY02W10/37
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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