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Preparation method of multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus/red phosphorus composite film

A titanium dioxide, multi-heterojunction technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of easy recombination and low recycling, and achieve Excellent stability, improved degradation efficiency, and reduced economic costs

Active Publication Date: 2022-06-21
NORTHEAST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the existing black phosphorus problems of easy recombination of photogenerated electron-hole pairs and low recyclability, the present invention proposes a method for preparing a multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus / red phosphorus composite film

Method used

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  • Preparation method of multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus/red phosphorus composite film
  • Preparation method of multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus/red phosphorus composite film
  • Preparation method of multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus/red phosphorus composite film

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specific Embodiment approach 1

[0031] Embodiment 1: The preparation method of the multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus / red phosphorus composite film of the present embodiment is carried out according to the following steps:

[0032] 1. Preparation of black phosphorus / red phosphorus materials with in situ heterojunction

[0033] Place the red phosphorus and ball milling beads in a ball mill for ball milling; then dissolve the ball-milled red phosphorus in an aqueous ammonium fluoride solution, and then transfer it to a reactor for programmed temperature-controlled hydrothermal treatment; finally, the obtained sample is dried to obtain a product A; Product A is a black phosphorus / red phosphorus material with an in-situ junction;

[0034] The temperature-programmed hydrothermal treatment process is as follows: raising the temperature to 190-210° C. at a heating rate of 1.5-2.5° C. per minute and maintaining the temperature for 1-2 hours;

[0035] 2. Preparation of multi-hete...

specific Embodiment approach 2

[0042] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ball milling process in step 1 is as follows: first, the ball milling time is 3 to 5 hours when the speed of the ball mill is 800 to 1000 rpm, and then the ball mill is rotated at a speed of 350 to 550 rpm. The ball is milled for 10 to 14 hours, and the diameter of the grinding ball selected in the ball milling is 0.4 to 0.6 cm. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the ratio of the mass of the red phosphorus after ball milling in step 1 to the volume of the ammonium fluoride aqueous solution is 1 g: (10-12 mL). Other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus / red phosphorus composite film, relating to a preparation method of the composite film. The purpose is to solve the problem of easy recombination and low recyclability of photogenerated electron-hole pairs in black phosphorus. Method: Dissolve red phosphorus in ammonium fluoride after ball milling, carry out temperature-programmed hydrothermal treatment, and dry to obtain product A; dissolve tetraisopropyl titanate in isopropanol, then add bismuth vanadate and product A, add distilled water and stir until appearing The colloid is transferred to the reactor, subjected to programmed temperature hydrothermal treatment, and finally coated on carbon cloth. The composite film prepared by the invention has a multi-heterojunction structure, which promotes the conduction band electrons of black phosphorus and BiVO 4 The effective separation of holes in the valence band, the black phosphorus / red phosphorus in-situ junction has a tighter interface combination, and the effective separation of photogenerated electron-hole pairs is more utilized. The recyclability rate of the composite membrane is improved, and it has excellent stability. The invention is suitable for preparing multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus / red phosphorus composite film.

Description

technical field [0001] The invention relates to a preparation method of a multi-heterojunction titanium dioxide-bismuth vanadate-black phosphorus / red phosphorus composite film. Background technique [0002] The phosphorus content accounts for 0.1% of the earth's crust, and it has the advantages of wide source and low price. In 2012, red phosphorus was found to make H under visible light irradiation. 2 O produces H 2 , which has since opened the extensive research on red phosphorus-based catalysts. In 2014, the properties of black phosphorus were redeveloped, becoming an emerging force in the material field after graphene, with its high carrier mobility (~1000 cm) 2 ·V -1 ·s -1 ), conductivity (~10 2 S / m), and is the most stable in all crystalline structures of phosphorus, therefore, black phosphorus shows extraordinary application value in the field of catalysis. However, black phosphorus still has defects such as easy recombination of photogenerated electron-hole pai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/14B01J23/18B01J37/00B01J37/10C02F1/30C02F101/36C02F101/34C02F101/38
CPCB01J27/14B01J23/18B01J23/002B01J37/0036B01J37/10C02F1/30B01J2523/00C02F2305/10C02F2101/36C02F2101/34C02F2101/38B01J35/33B01J35/39B01J2523/47B01J2523/54B01J2523/55
Inventor 关久念王雅琦鲁楠李露祁锟王威威
Owner NORTHEAST NORMAL UNIVERSITY