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A kind of cobalt, titanium oxide heterojunction material and preparation method thereof

A titanium oxide and heterojunction technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of non-functional, non-toxic and harmless dyes , does not meet the problems of industrial and ecological sustainable development, and achieves the effect of easy weighing, simple equipment requirements, and good visible light absorption performance

Active Publication Date: 2017-03-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although activated carbon adsorption can quickly and efficiently adsorb some azo dyes, it does not work for some dyes, and after adsorption, it cannot be finally converted into non-toxic, harmless, non-polluting substances to organisms and the environment, so it does not meet industrial, Ecologically sustainable development requirements

Method used

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  • A kind of cobalt, titanium oxide heterojunction material and preparation method thereof
  • A kind of cobalt, titanium oxide heterojunction material and preparation method thereof
  • A kind of cobalt, titanium oxide heterojunction material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 2.328g of cobalt nitrate hexahydrate and 2.880g of titanium sulfate, dissolve them in 100mL of deionized water, transfer the completely dissolved solution of cobalt nitrate and titanium sulfate to a 500mL round bottom flask, heat in an oil bath at 100°C, stir, condense and reflux , A solution was obtained in 30 min.

[0030] Then weigh 15.360g of ammonium carbonate and dissolve it in 50mL of deionized water to obtain solution B. The molar ratio of ammonium carbonate to the sum of cobalt ions and titanium ions is 4.9:1.

[0031] All solution A was dropped into the ammonium carbonate solution drop by drop, reacted for 5 hours, centrifugally filtered, washed, and dried at 60°C.

[0032] Baking at 400°C for 4 hours in a muffle furnace to obtain a heterojunction of cobalt and titanium oxides. Wherein Co / Ti=2mol:3mol, and the mass percentage of cobalt is 45%.

[0033] Weigh 0.020g of the above-mentioned cobalt and titanium oxide heterojunction and add it to 100mL of 1...

Embodiment 2

[0035] Weigh 2.328g cobalt nitrate hexahydrate, 7.680g titanium sulfate, dissolve in 100mL deionized water, then weigh 28.260g ammonium carbonate and dissolve in 50mL deionized water. Transfer the completely dissolved solution of cobalt nitrate and titanium sulfate to a 500mL round-bottomed flask, heat in an oil bath at 110°C, stir, condense and reflux, and after 25 minutes, add the solution of ammonium carbonate dropwise, the mixture of ammonium carbonate and cobalt ions and titanium ions and the molar ratio of 4.5:1. After reacting for 5 h, the solution was centrifuged, washed, and dried at 60°C. Calcined in a muffle furnace at 500° C. for 5 hours to obtain a cobalt-titanium oxide heterojunction with a cobalt content of 23% by mass.

Embodiment 3

[0037] Weigh 2.328g cobalt nitrate hexahydrate, 5.760g titanium sulfate, dissolve in 100mL deionized water, then weigh 26.120g ammonium carbonate and dissolve in 50mL deionized water. Transfer the completely dissolved solution of cobalt nitrate and titanium sulfate to a 500mL round-bottomed flask, heat in an oil bath at 100°C, stir, condense and reflux, and after 15 minutes, add the solution of ammonium carbonate dropwise, the mixture of ammonium carbonate and cobalt ions and titanium ions and the molar ratio of 5.2:1. After reacting for 7 hours, the solution was centrifuged, washed, and dried at 60°C. Calcined in a muffle furnace at 450° C. for 2 hours to obtain cobalt and titanium oxides with Co / Ti=1 mol:3 mol and a mass percentage of cobalt of 29%.

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Abstract

The invention discloses a heterojunction material and a preparation method thereof. The preparation method comprises the following steps: dissolving soluble divalent cobalt salt and titanium sulfate in deionized water, adding an ammonium carbonate solution under stirring condition, reacting for 90-120 DEG C, performing reflux condensation for 4-12 hours, centrifuging, washing, drying, and calcinating the product in a muffle furnace for 2-5 hours at temperature of 300-600 DEG C to obtain the cobalt, titanium oxide heterojunction material. The mass percentage content of cobalt in the material is 23-55%, the average particle size is 0.5-3mum, a structure is characterized in that anatase TiO2 (101)crystal face and Co3O4 (400)crystal face are connected to form a heterojunction structure. The material has absorption property to visible light and can be used for degrading an azo dye under visible light.

Description

technical field [0001] The invention relates to the field of preparation of heterojunction materials, in particular to cobalt and titanium oxide heterojunction materials and a preparation method thereof. The cobalt and titanium oxide heterojunction materials have adsorption properties for visible light. Background technique [0002] Titanium dioxide (TiO 2 ) is also known as titanium dioxide, which has the advantages of high photocatalytic efficiency, good chemical stability, low toxicity, low cost and easy preparation. It can be widely used in food, hygiene, building materials, etc. because it can absorb ultraviolet rays to achieve disinfection and sterilization. It is also widely used in sunscreen products in the daily chemical industry because it can absorb ultraviolet rays. There are three crystal forms of titanium dioxide in nature: rutile, anatase and brookite. Rutile is the only stable crystal phase, while anatase and brookite are low-temperature phases of titanium d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75C02F1/30
CPCY02W10/37
Inventor 雷晓东李芳赵培雯孙晓明
Owner BEIJING UNIV OF CHEM TECH
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