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A kind of carbon nitride nanosheet supported indium vanadate quantum dot photocatalyst and its preparation and application

A photocatalyst and nanosheet technology, applied in the field of photocatalytic materials, can solve the problems of poor photocatalytic reduction performance, easy recombination of photogenerated carriers, and difficult recombination of carriers, and achieve high CO2 reduction performance and wide light absorption range , is conducive to the effect of charge transfer

Active Publication Date: 2022-08-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a carbon nitride nanosheet-loaded indium vanadate quantum dot photocatalyst and its preparation and application, to solve the above-mentioned carbon nitride as a photocatalytic material with limited light absorption range, few surface active sites, Photocatalytic reduction of CO induced by photogenerated carriers are easily recombined 2 The technical problem of poor performance, the prepared catalyst has a wide light absorption range, the light absorption edge can reach 600nm, and the carriers are not easy to recombine. Under the simulated sunlight irradiation of λ>420nm, the reduction rate to CO can reach up to 69.8μmol h -1 g -1

Method used

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  • A kind of carbon nitride nanosheet supported indium vanadate quantum dot photocatalyst and its preparation and application
  • A kind of carbon nitride nanosheet supported indium vanadate quantum dot photocatalyst and its preparation and application
  • A kind of carbon nitride nanosheet supported indium vanadate quantum dot photocatalyst and its preparation and application

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Experimental program
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Embodiment 1

[0073] A carbon nitride nanosheet supported indium vanadate quantum dot photocatalyst mainly contains five main elements of In, V, O, C and N, and is prepared by a method comprising the following steps:

[0074] (1) Carbon nitride (hereinafter referred to as g-C3 N 4 ) preparation

[0075] Take 3g of melamine and put it in a tube furnace, heat it up to 520°C for calcination, the gas atmosphere is air, the heating rate is 5°C / min, and the temperature is kept for 4h to obtain g-C 3 N 4 ;

[0076] (2) Indium vanadate (hereinafter referred to as InVO 4 ) preparation of precursors

[0077] Dissolve 1 mmol of indium trichloride tetrahydrate in 10 mL of deionized water, and 1 mmol of sodium orthovanadate in 20 mL of deionized water to obtain an aqueous solution of 0.1 mmol / ml indium chloride and 0.05 mmol / ml of sodium orthovanadate, respectively. aqueous solution;

[0078] Then control the dropping rate to be 0.5ml / min and drop the aqueous solution of 0.1mmol / ml indium chloride...

Embodiment 2

[0106] A carbon nitride nanosheet supported indium vanadate quantum dot photocatalyst mainly contains five main elements of In, V, O, C and N, and is prepared by a method comprising the following steps:

[0107] (1) Carbon nitride (hereinafter referred to as g-C 3 N 4 ) preparation

[0108] Take 3g of melamine and put it in a tube furnace, heat it up to 520°C for calcination, the gas atmosphere is air, the heating rate is 5°C / min, and the temperature is kept for 4h to obtain g-C 3 N 4 ;

[0109] (2) Indium vanadate (hereinafter referred to as InVO 4 ) preparation of precursors

[0110] Dissolve 1 mmol of indium trichloride tetrahydrate in 10 mL of deionized water, and 1 mmol of sodium orthovanadate in 20 mL of deionized water to obtain an aqueous solution of 0.1 mmol / ml indium chloride and 0.05 mmol / ml of sodium orthovanadate, respectively. aqueous solution;

[0111] Then control the dropping rate to be 0.5ml / min and drop the aqueous solution of 0.1mmol / ml indium chlori...

Embodiment 3

[0123] A carbon nitride nanosheet supported indium vanadate quantum dot photocatalyst mainly contains five main elements of In, V, O, C and N, and is prepared by a method comprising the following steps:

[0124] (1) Carbon nitride (hereinafter referred to as g-C 3 N 4 ) preparation

[0125] Take 3g of melamine and put it in a tube furnace, heat it up to 520°C for calcination, the gas atmosphere is air, the heating rate is 5°C / min, and the temperature is kept for 4h to obtain g-C 3 N 4 ;

[0126] (2) Indium vanadate (hereinafter referred to as InVO 4 ) preparation of precursors

[0127] Dissolve 1 mmol of indium trichloride tetrahydrate in 10 mL of deionized water, and 1 mmol of sodium orthovanadate in 20 mL of deionized water to obtain an aqueous solution of 0.1 mmol / ml indium chloride and 0.05 mmol / ml of sodium orthovanadate, respectively. aqueous solution;

[0128] Then control the dropping rate to be 0.5ml / min and drop the aqueous solution of 0.1mmol / ml indium chlori...

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Abstract

The invention relates to a carbon nitride nanosheet-supported indium vanadate quantum dot photocatalyst and its preparation and application. The preparation method of the catalyst is as follows: (1) dissolving indium trichloride tetrahydrate and sodium orthovanadate, respectively, to remove In ionized water, an aqueous solution of indium chloride and an aqueous solution of sodium orthovanadate are obtained, and then the aqueous solution of indium chloride is added dropwise to the aqueous solution of sodium orthovanadate, and the pH is adjusted to be clear to obtain InVO 4 Precursor solution; (2) take g-C 3 N 4 Ultrasonic dispersion into InVO 4 In the precursor solution, hydrothermal reaction is carried out, and the obtained product is centrifuged, washed and dried to obtain the target product. Compared with the prior art, the catalyst prepared by the present invention has a wider light absorption range, and it reduces CO under visible light 2 The ability has been greatly improved, and it has shown excellent ability to convert CO 2 The selectivity of reduction to carbon monoxide, while the photocatalyst has low resistivity, fast charge carrier transfer ability, high photogenerated charge carrier separation ability, low charge carrier recombination rate, and good reduction of CO 2 cycle stability, etc.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and relates to a carbon nitride nanosheet-supported indium vanadate quantum dot photocatalyst and its preparation and application. Background technique [0002] With the rapid development of industrialization and population growth, the global demand for energy consumption is increasing, which is mainly solved by the large-scale consumption of non-renewable fossil fuels, resulting in excess CO 2 produce. a lot of CO 2 Emissions cause CO in the atmosphere 2 Concentrations have increased from 280 ppm before the Industrial Revolution to over 410 ppm in 2019, drawing public attention to the issue of global warming. Global average temperatures have risen by more than 1°C from pre-industrial levels, adversely affecting a range of environmental and anthropological issues. Therefore, it is crucial to significantly reduce CO 2 emissions. In the process of simulating natural photosynt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B32/40B01J35/10
CPCB01J35/004B01J27/24C01B32/40B01J35/1004
Inventor 陈作锋巩帅奇滕雪牛艳丽徐铭泽
Owner TONGJI UNIV
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