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A kind of tin dioxide/nitrogen-doped graphite/zinc sulfide composite material with core-shell structure and preparation method thereof

A technology of tin dioxide and core-shell structure, applied in the direction of catalyst activation/preparation, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of difficult control of the microstructure of photocatalytic composite materials, poor electrical conductivity, and weak photocatalytic ability and other problems, to achieve the effects of easy control of product structure, improved electrical properties, and simple preparation methods

Active Publication Date: 2021-07-13
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing scheme, tin dioxide is used as an n-type semiconductor, but its electrical conductivity is poor, the photocatalytic ability is weak, and it is difficult to control the microstructure of the photocatalytic composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of tin dioxide / nitrogen-doped graphite / zinc sulfide composite material with core-shell structure, its preparation method comprises the steps:

[0029] 1) Add 0.3g of hexamethylenetetramine, 0.9g of cetyltrimethylammonium bromide, and 0.8g of tin tetrachloride into 50mL of water / ethanol mixture (volume ratio 1:1), and stir for 1h , then add 1.0 g of sodium hydroxide, then pour it into a hydrothermal reaction kettle, react at 180° C. for 12 hours, wash and dry to obtain tin dioxide nanospheres with a particle size of about 200 nm;

[0030] 2) Soak the tin dioxide nanospheres in a dopamine solution with a concentration of 3 mg / mL, and adjust the pH value to 8.0 with a Tris buffer solution, and use the self-polymerization of dopamine (reaction at room temperature for 14 hours) to obtain polydopamine-coated tin dioxide;

[0031] 3) Add polydopamine-coated tin dioxide to ethylene glycol containing zinc acetate and thiourea, react hydrothermally at 160°C for 24 hours, w...

Embodiment 2

[0035] A kind of tin dioxide / nitrogen-doped graphite / zinc sulfide composite material with core-shell structure, its preparation method comprises the steps:

[0036] 1) Add 0.3g of hexamethylenetetramine, 0.9g of cetyltrimethylammonium bromide, and 0.8g of tin tetrachloride into 80mL of water / ethanol mixture (volume ratio 1:1), and stir for 1.5 h, then add 1.0 g of sodium hydroxide, then pour it into a hydrothermal reaction kettle, react at 180° C. for 16 hours, wash and dry to obtain tin dioxide nanospheres with a particle diameter of about 300 nm;

[0037] 2) Soak the tin dioxide nanospheres in a dopamine solution with a concentration of 4 mg / mL, and adjust the pH value to 8.5 with a Tris buffer solution, and use the self-polymerization of dopamine (reaction at room temperature for 16 hours) to obtain polydopamine-coated tin dioxide;

[0038] 3) Add polydopamine-coated tin dioxide to ethylene glycol containing zinc acetate and thiourea, react hydrothermally at 170°C for 22 ho...

Embodiment 3

[0042] A kind of tin dioxide / nitrogen-doped graphite / zinc sulfide composite material with core-shell structure, its preparation method comprises the steps:

[0043] 1) Add 0.3g of hexamethylenetetramine, 0.9g of hexadecyltrimethylammonium bromide, and 0.8g of tin tetrachloride into 100mL of water / ethanol mixture (volume ratio 1:1), and stir for 2h , then add 1.0 g of sodium hydroxide, then pour it into a hydrothermal reaction kettle, react at 180° C. for 18 hours, wash and dry to obtain tin dioxide nanospheres with a particle size of about 350 nm;

[0044] 2) Soak the tin dioxide nanospheres in a dopamine solution with a concentration of 5 mg / mL, and adjust the pH value to 9.0 with a Tris buffer solution, and use the self-polymerization of dopamine (reaction at room temperature for 20 h) to obtain polydopamine-coated tin dioxide;

[0045]3) Add polydopamine-coated tin dioxide to ethylene glycol containing zinc acetate and thiourea, and react hydrothermally at 180°C for 17 hour...

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Abstract

The invention discloses a tin dioxide / nitrogen-doped graphite / zinc sulfide composite material with a core-shell structure, which uses dopamine to polymerize on the surface of tin dioxide under weakly alkaline conditions to form a polydopamine nano-film, and passes the amino group of polydopamine It effectively coordinates and adsorbs zinc ions with hydroxyl groups to realize the construction of a core-shell structure, and then it is obtained by high-temperature roasting. In the present invention, zinc sulfide and tin dioxide are used together to widen the photoresponse range to the visible light range, and the core-shell structure formed in combination can promote the generation of photogenerated electrons and holes under the excitation of sunlight, and the nitrogen-doped graphite tin dioxide It has good electrocatalytic performance, can effectively transfer photogenerated electrons injected from zinc sulfide, and further improves the utilization rate of visible light; the composite material obtained in the present invention has excellent photocatalytic performance, and is suitable for fields such as visible light catalysis, and involves a preparation method Simple, easy to control product structure, suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and novel photocatalytic materials, and specifically relates to a tin dioxide / nitrogen-doped graphite / zinc sulfide composite material with a core-shell structure and a preparation method thereof. Background technique [0002] Materials with visible photocatalytic properties have attracted more and more attention from researchers. Among them, semiconductor photocatalytic materials have been widely studied due to their special optical and electrical properties, long-term stability, resistance to light corrosion and chemical corrosion. Compared with single component semiconductor materials, composite materials are considered to have better photocatalytic performance. [0003] Chinese Invention Patent (Application No. 200880128349.6) discloses a granular material with photocatalytic activity, which contains at least one inorganic particulate material (mainly inorganic pigments, limestone,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/10B01J37/08C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J27/24B01J35/0013B01J35/0033B01J35/004B01J35/006B01J35/008B01J37/084B01J37/10C02F1/30C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2305/10
Inventor 罗晓锋李亮喻湘华穆海梅熊丽君张桥
Owner WUHAN INSTITUTE OF TECHNOLOGY