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2D/2D heterojunction pressure-photocatalyst and preparation method thereof

A photocatalyst and heterojunction technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve unsatisfactory photocatalytic activity, hinder the industrial application of photocatalysts, and photocatalytic efficiency Low and other problems, to achieve the effect of efficient utilization, effective separation, simple preparation method

Inactive Publication Date: 2020-08-21
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the most important issues hindering the industrial application of photocatalysts is the low photocatalytic efficiency caused by the annihilation of photogenerated electron-hole pairs. to overcome this limitation
However, the photocatalytic activity of the currently developed catalysts is far from satisfactory. Therefore, it is still necessary to find an effective way to improve the catalytic performance by inhibiting the recombination of photogenerated electron-hole pairs and collecting the fine vibrational energy of the environment for catalysis.

Method used

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  • 2D/2D heterojunction pressure-photocatalyst and preparation method thereof
  • 2D/2D heterojunction pressure-photocatalyst and preparation method thereof
  • 2D/2D heterojunction pressure-photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh 0.5g of Nb 2 o 5 and 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH with K + :Na + = Mineralizer solution (0.5mol / L) with a ratio of 2:1, stirred for 1h, transferred the above material to a Teflon stainless steel autoclave (100ml), and then heated at 200°C for 10h. After cooling, the white precipitate was washed with deionized water, and then dried at 80 °C to obtain NaNbO 3 Nanosheets.

[0029] 2) Weigh 0.065g of sodium molybdate and 0.130g of thiourea and dissolve them in 20mL of oxalic acid solution (0.075mol / L), stir magnetically for 0.5h, and dissolve the total mass of 10% NaNbO 3 Nanosheet powder was added to the above solution, stirred for 1h, then transferred to a 100ml Teflon autoclave, and heated at 200°C for 24h. Cool to room temperature, wash several times with deionized water, and then dry at 60°C for 12h to obtain the NaNbO 3 / MoS 2 piezoelectric catalyst.

[0030] 3) Use a catalyst concentration of 0.05 mg / L to ...

Embodiment 2

[0032] 1) Weigh 0.5g of Nb 2 o 5 and 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH with K + :Na += Mineralizer solution (0.5mol / L) with a ratio of 2:1, stirred for 1h, transferred the above material to a Teflon stainless steel autoclave (100ml), and then heated at 200°C for 10h. After cooling, the white precipitate was washed with deionized water, and then dried at 80 °C to obtain NaNbO 3 Nanosheets.

[0033] 2) Weigh 0.065g of sodium molybdate and 0.130g of thiourea and dissolve them in 20mL of oxalic acid solution (0.075mol / L), stir magnetically for 1h, and dissolve the total mass of 10% NaNbO 3 The nanosheet powder was added to the above solution, stirred for 1 h, then transferred to a 100 ml Teflon autoclave, and heated at 200 °C for 24 h. Cool to room temperature, wash several times with deionized water, and then dry at 60°C for 12h to obtain the NaNbO 3 / MoS 2 piezoelectric catalyst.

[0034] 3) Use a catalyst concentration of 0.1 mg / L...

Embodiment 3

[0036] 1) Weigh 0.5g of Nb 2 o 5 and 0.02g of sodium dodecylbenzenesulfonate dispersed in 80ml of KOH and NaOH with K + :Na + =2:1 mineralizer solution (0.5mol / L), stirred for 1h, transferred the above material to a Teflon stainless steel autoclave (100ml), and then heated at 210°C for 6h. After cooling, the white precipitate was washed with deionized water, and then dried at 80 °C to obtain NaNbO 3 Nanosheets.

[0037] 2) Weigh 0.065g of sodium molybdate and 0.130g of thiourea and dissolve them in 20mL of oxalic acid solution (0.075mol / L), stir for 1h by magnetic force, add NaNbO3 nanosheet powder with a total mass of 40% to the above solution, and stir for 1h , and then transferred to a 100ml Teflon autoclave and heated at 200°C for 24h. Cool to room temperature, wash several times with deionized water, and then dry at 60°C for 12h to obtain the NaNbO 3 / MoS 2 piezoelectric catalyst.

[0038] 3) Use a catalyst concentration of 0.1mg / L to achieve piezoelectric-photoco...

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Abstract

The invention discloses a 2D / 2D heterojunction pressure-photocatalyst and a preparation method thereof. The 2D / 2D heterojunction pressure-photocatalyst is composed of a piezoelectric NaNbO3 nano-sheetand a MoS2 nano-layer, and the NaNbO3 / MoS2 heterojunction pressure-photocatalyst is hydrothermally synthesized by adopting a simple two-step process. The 2D / 2D nano NaNbO3 / MoS2 heterojunction can collect fine vibration energy in an environment through a piezoelectric effect to induce the surface to generate electron hole pairs so as to drive the decomposition of organic pollutants; besides, due to the formation of the heterojunction and the synergistic effect of a built-in electric field caused by mechanical vibration, charges are effectively separated, and the photocatalytic activity is effectively enhanced, so that synchronous collection and utilization of mechanical vibration energy and visible light are realized. According to the design of the nano-composite material based on a 2D piezoelectric material, the limitation that a single piezoelectric material serves as a catalyst is broken through, efficient coupling utilization of mechanical vibration and visible light is achieved, anew way is provided for environmental remediation and renewable energy production, and the preparation method of the nano-composite material is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a 2D / 2D heterojunction pressure-photocatalyst and a preparation method thereof. Background technique [0002] Due to the growth of the world's population and the rapid development of industry, the demand for environmental protection is increasing. Water-soluble organic dye contaminants are highly stable and particularly difficult to handle, causing serious health and environmental concerns. To solve this serious problem, there is an urgent need to develop environmentally friendly, convenient, and inexpensive technologies for degrading organic pollutants. In recent years, utilizing the polarization effect of piezoelectric nanomaterials has been considered as an effective method to improve the efficiency of photocatalytic degradation. The separation of photogenerated electrons and holes can be effectively promoted by the introduction of built-in electric field. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C02F1/30C02F1/36C02F101/30
CPCB01J27/051C02F1/30C02F1/36C02F2101/30C02F2305/10B01J35/39
Inventor 刘智勇张安徐帅昌卢金山郭坤
Owner NANCHANG HANGKONG UNIVERSITY
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