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A kind of visible light catalytic material and its preparation method and application

A catalytic material, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Low efficiency, etc.

Active Publication Date: 2020-12-25
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing pairs of g-C 3 N 4 The improved methods of photocatalysts still generally have problems such as high recombination rate of photogenerated electrons and holes and low utilization rate of light, which leads to low photocatalytic efficiency of photocatalysts.

Method used

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  • A kind of visible light catalytic material and its preparation method and application
  • A kind of visible light catalytic material and its preparation method and application

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preparation example Construction

[0027] In the present invention, the preparation method of the conductive ceramic preferably includes the following steps: mixing graphene, aluminum oxide and zinc oxide, followed by crushing, tablet molding and sintering to obtain the conductive ceramic.

[0028] In the present invention, the crushing is preferably ball milling, more preferably wet milling; the solvent used in the wet milling is preferably ethanol; the ball-to-material ratio is preferably 2:1. In the present invention, the usage ratio of described graphene, aluminum oxide, zinc oxide is preferably 1g:(8~9)g:(1~2)g:(500~600)mL, more preferably 1g:(8.5 ~9) g: (1.5 ~ 2) g: (500 ~ 550) mL, most preferably 1 g: 9 g: 2 g: 500 mL. In the present invention, the wet grinding time is preferably 3-5 hours, more preferably 4 hours.

[0029] After the crushing is completed, the present invention preferably further includes drying the obtained powder; the drying temperature is preferably 110-130°C, more preferably 120°C; ...

Embodiment 1

[0066] Disperse melamine (3g) in deionized water (20mL), add ammonium dihydrogen phosphate (0.35g) to the resulting suspension and mix ultrasonically for 30min, then stir and react at room temperature (25°C) for 12h, then place in an oven Dry at 100°C for 6h, put it in a crucible with a lid, heat up to 550°C at a rate of 2.5°C / min, bake for 4h, cool to room temperature, and get P-C 3 N 4 ;

[0067] Graphene oxide (5 mg) and deionized water (20 mL) were ultrasonically mixed for 1 h, and P-C 3 N 4 (0.75g) and ultrasonically mixed for 0.5h, stirred at room temperature for 12h, and then dried in an oven at 100°C for 6h to obtain P-C 3 N 4 / GO;

[0068] Bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 (2mmol) was dissolved in glacial acetic acid (5mL) to obtain an acetic acid solution of bismuth nitrate, and P-C 3 N 4 / GO (0.2g), ammonium metavanadate (NH 4 VO 4 , 2mmol) and 30mL of deionized ultrasonic mixing for 30min to obtain a suspension, under the condition of a stirring speed ...

Embodiment 2

[0072] Disperse melamine (3g) in deionized water (20mL), add ammonium dihydrogen phosphate (0.35g) to the resulting suspension and mix ultrasonically for 30min, then stir and react at room temperature (25°C) for 12h, then place in an oven Dry at 100°C for 6h, put it in a crucible with a lid, heat up to 550°C at a rate of 2.5°C / min, bake for 4h, cool to room temperature, and get P-C 3 N 4 ;

[0073] Graphene oxide (5 mg) and deionized water (20 mL) were ultrasonically mixed for 1 h, and P-C 3 N 4 (0.75g) and ultrasonically mixed for 0.5h, stirred at room temperature for 12h, and then dried in an oven at 100°C for 6h to obtain P-C 3 N 4 / GO;

[0074] Bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O, 1.5mmol) was dissolved in glacial acetic acid (5mL) to obtain an acetic acid solution of bismuth nitrate, and P-C 3 N 4 / GO (0.2g), ammonium metavanadate (NH 4 VO 4 , 1.5mmol) and 30mL of deionized ultrasonic mixing for 30min to obtain a suspension, under the condition of a stirring ...

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Abstract

The invention provides a visible light catalytic material and its preparation method and application, belonging to the technical field of catalysts. The visible light catalytic material provided by the present invention includes a carrier and an active component loaded on the surface of the carrier; the carrier is a conductive ceramic; the active component is P-C 3 N 4 , graphene oxide and bismuth vanadate; the raw materials for the preparation of the conductive ceramics include graphene, aluminum oxide and zinc oxide. P-C in the visible photocatalytic material provided by the invention 3 N 4 and BiVO 4 Both can be excited by visible light to generate photogenerated electrons and holes, BiVO 4 The reducing electrons on the P‑C will be transferred to the 3 N 4 On, and recombining with its oxidative holes, RGO can act as an electron transport medium to enhance the above process. The present invention adopts active components of a specific composition and a carrier to be used together, and the provided visible light catalytic material has excellent visible light catalytic efficiency and recovery efficiency.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a visible light catalytic material and its preparation method and application. Background technique [0002] Photocatalytic technology can directly and effectively use solar energy to degrade pollutants in the environment, and has shown great application potential in solving environmental pollution and energy scarcity. However, since about 45% of sunlight is visible light, and the proportion of ultraviolet light is less than 5%, in order to use sunlight more efficiently, the development of photocatalysts with visible light catalytic activity is very important for the development and application of photocatalytic technology. . [0003] g-C 3 N 4 As a new type of non-metallic photocatalytic material, it is easy to prepare, has excellent physical and chemical stability and good photoelectric performance, and is different from traditional TiO 2 photocatalyst compared to g-C 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/02C02F1/30C02F101/30C02F101/34C02F101/38B01J35/00
CPCB01J27/24B01J37/0215C02F1/30C02F2101/30C02F2305/10C02F2101/34C02F2101/38B01J35/33B01J35/39B01J23/18B01J23/22C01B21/0605B01J37/04B01J37/08B01J37/06C01B32/198C02F1/725C02F2101/36B01J35/19
Inventor 于宏兵王美阳董恒于晗
Owner NANKAI UNIV
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