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Preparation method of flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst, and product thereof

A technology of titanium dioxide and bismuth oxyiodide, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low carrier transport efficiency, insufficient light absorption, small specific surface area, etc. Achieve the effects of promoting electron-hole separation ability, broad application potential, and simple preparation method

Pending Publication Date: 2020-06-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Photocatalytic technology is a green technology with important application prospects in the fields of energy and the environment, but current photocatalysts have disadvantages: insufficient light absorption, small specific surface area and low carrier transport efficiency limit their photocatalytic activity
Bi x o y I z The photocatalyst has [Bi 2 o 2 ] 2+ The unique layered crystal structure formed by the double I layer can generate an internal electrostatic field perpendicular to each layer, which can induce the effective separation of photogenerated electrons and holes, but its wide band gap has become its biggest weakness, limiting its further application

Method used

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  • Preparation method of flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst, and product thereof
  • Preparation method of flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst, and product thereof
  • Preparation method of flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst, and product thereof

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Experimental program
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Embodiment 1

[0029] This embodiment provides a method for preparing a spherical bismuth oxyiodide-titanium dioxide heterojunction photocatalyst:

[0030] (1) Take titanium dioxide powder P25 powder, immerse it in ethanol for 1 hour, take it out, put it in a drying oven at 70°C for 10 hours, put it in a muffle furnace and calcinate it at 220°C at a heating rate of 3°C / min for 2.5 Take it out after 1 hour to get calcined titanium dioxide.

[0031] (2) Take bismuth nitrate pentahydrate and evenly disperse it in ethylene glycol to obtain bismuth nitrate pentahydrate ethylene glycol mixed solution, disperse the calcined titanium dioxide into bismuth nitrate pentahydrate ethylene glycol mixed solution, stir at 1500rpm for 3h Obtain mixed solution a; Described mixed solution a, wherein, the molar volume ratio of bismuth nitrate pentahydrate and ethylene glycol is 1:10 in mmol:mL, and the mass volume ratio of titanium dioxide and ethylene glycol after calcining is in g:mL Count as 1:15.

[0032]...

Embodiment 2

[0039] This embodiment provides a method for preparing a spherical bismuth oxyiodide-titanium dioxide heterojunction photocatalyst:

[0040] (1) Take titanium dioxide powder P25 powder, immerse it in ethanol for 1 hour, take it out, put it in a drying oven at 70°C for 10 hours, put it in a muffle furnace and calcinate it at 220°C at a heating rate of 3°C / min for 2.5 Take it out after 1 hour to get calcined titanium dioxide.

[0041] (2) Take bismuth nitrate pentahydrate and evenly disperse it in ethylene glycol to obtain bismuth nitrate pentahydrate ethylene glycol mixed solution, disperse the calcined titanium dioxide into bismuth nitrate pentahydrate ethylene glycol mixed solution, stir at 1000rpm for 3h Obtain mixed solution a; Described mixed solution a, wherein, the molar volume ratio of bismuth nitrate pentahydrate and ethylene glycol is 1:10 in mmol:mL, and the mass volume ratio of titanium dioxide and ethylene glycol after calcining is in g:mL Count as 1:15.

[0042]...

Embodiment 3

[0045] This embodiment provides a method for preparing a spherical bismuth oxyiodide-titanium dioxide heterojunction photocatalyst:

[0046] (1) Take titanium dioxide powder P25 powder, immerse it in ethanol for 1 hour, take it out, put it in a drying oven at 70°C for 10 hours, put it in a muffle furnace and calcinate it at 220°C at a heating rate of 3°C / min for 2.5 Take it out after 1 hour to get calcined titanium dioxide.

[0047] (2) Take bismuth nitrate pentahydrate and disperse evenly in ethylene glycol to obtain bismuth nitrate pentahydrate ethylene glycol mixed solution, disperse the calcined titanium dioxide into bismuth nitrate pentahydrate ethylene glycol mixed solution, stir at 1500rpm for 3h Obtain mixed solution a; Described mixed solution a, wherein, the molar volume ratio of bismuth nitrate pentahydrate and ethylene glycol is 1:10 in mmol:mL, and the mass volume ratio of titanium dioxide and ethylene glycol after calcining is in g:mL Count as 1:15.

[0048] (3...

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Abstract

The invention discloses a preparation method of a flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst, and a product thereof. The preparation method comprises the following steps: uniformly dispersing bismuth nitrate pentahydrate into ethylene glycol to obtain a bismuth nitrate pentahydrate-ethylene glycol mixed solution, dispersing calcined titanium dioxide into thebismuth nitrate pentahydrate-ethylene glycol mixed solution, and carrying out stirring for 2-3 hours to obtain a mixed solution a; uniformly dispersing potassium iodide in deionized water, and carrying out stirring for 1-2 hours to obtain an aqueous potassium iodide solution; mixing the mixed solution a with the aqueous potassium iodide solution, carrying out stirring for 2-3 hours, putting the formed mixture into polytetrafluoroethylene and carrying out solvothermal treatment at 180-200 DEG C for 8-12 hours; and subjecting a product obtained in the previous step to washing and drying so as to obtain the flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst. Compared with a conventional photocatalyst in the field, the flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst has the advantages that the response range of the photocatalyst to visible light is expanded to 600 nm, the specific surface area of the photocatalyst is greatly increased, and the flower-ball-shaped bismuth oxyiodide-titanium dioxide heterojunction photocatalyst has wide application potential in the aspects of photocatalytic removal of heavy metals and thelike.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, and in particular relates to a preparation method and product of a flower spherical bismuth oxyiodide-titanium dioxide heterojunction photocatalyst. Background technique [0002] Titanium dioxide has chemical inertness, good biocompatibility, strong oxidation ability and chemical corrosion resistance, and is widely used in wastewater treatment, environmental purification, cosmetic catalysts, fillers and other fields. Photocatalytic technology is a green technology with important application prospects in the fields of energy and environment, but current photocatalysts have disadvantages: insufficient light absorption, small specific surface area and low carrier transport efficiency limit their photocatalytic activity. [0003] Bi x o y I z Photocatalysts exhibit excellent photocatalytic activity under visible light and have been extensively studied. Bi x o y I z The photocatalyst ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/08C02F1/30C02F101/20
CPCB01J27/06C02F1/30C02F2305/10C02F2101/20B01J35/51B01J35/39
Inventor 吴江吴嘉曦谢夏林陈丽萍王宇星王浩同朱润豪张梅琳依德热斯·依沙
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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