A heterojunction core-shell lafeo 3 @g-c 3 no 4 Nanocomposite materials and their preparation methods and applications

A nanocomposite material and technology of composite materials are applied in the field of preparation of heterojunction core-shell LaFeO3@g-C3N4 nanocomposite materials, which can solve problems such as absorption limitation in the visible light region, and achieve enhanced interfacial interaction and photoelectric stability. , the effect of simple equipment

Active Publication Date: 2021-07-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, p-type LaFeO 3 and n-type g-C 3 N 4 Combined composite nanomaterials have been reported, but the resulting composites are often LaFeO 3 load in g-C 3 N 4 On the nanosheet, its absorption in the visible region is also limited

Method used

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  • A heterojunction core-shell lafeo <sub>3</sub> @g-c <sub>3</sub> no <sub>4</sub> Nanocomposite materials and their preparation methods and applications
  • A heterojunction core-shell lafeo <sub>3</sub> @g-c <sub>3</sub> no <sub>4</sub> Nanocomposite materials and their preparation methods and applications
  • A heterojunction core-shell lafeo <sub>3</sub> @g-c <sub>3</sub> no <sub>4</sub> Nanocomposite materials and their preparation methods and applications

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Effect test

Embodiment 1

[0034] Heterojunction core-shell LaFeO 3 @g-C 3 N 4 one-step preparation of

[0035] (1) g-C 3 N 4 preparation of

[0036] Weigh 10g of melamine, put it into four crucibles, put it into a tube furnace, and calcinate at 550°C for 4 hours, with a heating rate of 2°C / min. The prepared solids were ground into powders and subjected to secondary calcination at the same temperature. Then, weigh g-C 3 N 4 4.856g of powder was dispersed in 20mL of ultrapure water, and ultrasonically treated for 6 hours to obtain g-C 3 N 4 The suspension was used further.

[0037] (2) Heterojunction core-shell LaFeO 3 @g-C 3 N 4 One-step preparation of composite materials

[0038] Dissolve 10 mmol of citric acid, 5 mmol of lanthanum nitrate hexahydrate, and 5 mmol of ferric nitrate nonahydrate in 30 mL of a mixed solvent of ultrapure water and ethanol, wherein the ratio of ultrapure water to ethanol is 1:2. Subsequently, the mixture was stirred at room temperature for 30 minutes. After h...

Embodiment 2

[0050] Heterojunction core-shell LaFeO 3 @g-C 3 N 4 one-step preparation of

[0051] (1) g-C 3 N 4 preparation of

[0052] Weigh 10g of melamine, put it into four crucibles, put it into a tube furnace, and calcinate at 550°C for 4 hours, with a heating rate of 2°C / min. The prepared solids were ground into powders and subjected to secondary calcination at the same temperature. Then, weigh g-C3 N 4 1.5g of the powder was dispersed in 33mL of ultrapure water, and ultrasonically treated for 3 hours to obtain g-C 3 N 4 The suspension was used further.

[0053] (2) Heterojunction core-shell LaFeO 3 @g-C 3 N 4 One-step preparation of composite materials

[0054] Dissolve 8 mmol of citric acid, 4 mmol of lanthanum nitrate hexahydrate, and 4 mmol of ferric nitrate nonahydrate in 20 mL of a mixed solvent of ultrapure water and ethanol, wherein the ratio of ultrapure water to ethanol is 1:2. Subsequently, the mixture was stirred at room temperature for 20 minutes. After he...

Embodiment 3

[0056] Heterojunction core-shell LaFeO 3 @g-C 3 N 4 one-step preparation of

[0057] (1) g-C 3 N 4 preparation of

[0058] Weigh 10g of melamine, put it into four crucibles, put it into a tube furnace, and calcinate at 550°C for 4 hours, with a heating rate of 2°C / min. The prepared solids were ground into powders and subjected to secondary calcination at the same temperature. Then, weigh g-C 3 N 4 13g of powder was dispersed in 26mL of ultrapure water, and ultrasonically treated for 9 hours to obtain g-C 3 N 4 The suspension was used further.

[0059] (2) Heterojunction core-shell LaFeO 3 @g-C 3 N 4 One-step preparation of composite materials

[0060] Dissolve 12 mmol of citric acid, 6 mmol of lanthanum nitrate hexahydrate, and 6 mmol of ferric nitrate nonahydrate in 40 mL of a mixed solvent of ultrapure water and ethanol, wherein the ratio of ultrapure water to ethanol is 1:2. Subsequently, the mixture was stirred at room temperature for 40 minutes. After heat...

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Abstract

The invention belongs to the field of preparation and detection of electrochemical functional materials, and provides a heterojunction core-shell LaFeO 3 @g‑C 3 N 4 Nanocomposite material and its preparation method and application, the preparation steps are as follows: Step 1, g-C 3 N 4 Preparation; Step 2, heterojunction core-shell LaFeO 3 @g‑C 3 N 4 One-step preparation of composite materials. In the present invention, a heterojunction core-shell LaFeO was prepared by a one-step method 3 @g‑C 3 N 4 The nanocomposite material improves the visible light absorption and charge separation efficiency, which in turn enhances the photocurrent intensity and stability. At the same time, a photoelectrochemical sensor was designed to successfully detect STR.

Description

technical field [0001] The invention belongs to the field of preparation and detection of electrochemical functional materials, in particular to a heterojunction core-shell LaFeO 3 @g-C 3 N 4 Preparation methods of nanocomposites and applications in photoelectrochemical sensing. Background technique [0002] Core-shell structure materials have unique physical and chemical properties, and their excellent photoelectric conversion efficiency and excellent photoactivity have expanded the scope of application, making this type of material widely developed in the fields of sensing, catalysis, and solar cells. In addition, core-shell structured nanomaterials can not only maximize the interface area, but also facilitate the separation of photogenerated charge carriers and improve the visible light absorption performance. Among them, inorganic-organic core-shell structured materials have been intensively studied due to their facile synthesis and rapid separation efficiency of phot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02C01G49/00G01N27/30G01N27/327
CPCB01J13/02C01G49/00G01N27/305G01N27/3278
Inventor 王坤徐宇环葛兰丁丽君
Owner JIANGSU UNIV
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