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Preparation and application of core-shell-structure bismuth sulfide@bismuth oxide composite microspheres

A core-shell structure, bismuth sulfide technology, used in chemical/physical processes, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low photocatalytic activity of bismuth oxide and low photo-induced electron hole separation efficiency. problem, to achieve the effect of regular and controllable morphology, controllable crystal phase, and simple process

Active Publication Date: 2014-01-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the photocatalytic activity of these bismuth oxides with different morphologies is still not high due to the inefficient separation of photoinduced electron holes.

Method used

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  • Preparation and application of core-shell-structure bismuth sulfide@bismuth oxide composite microspheres
  • Preparation and application of core-shell-structure bismuth sulfide@bismuth oxide composite microspheres
  • Preparation and application of core-shell-structure bismuth sulfide@bismuth oxide composite microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to bismuth nitrate pentahydrate in the reaction mixture: thiourea: lysine: the mol ratio of ethylene glycol is 1:1.5:0.25:125, takes by weighing 4.85 grams of bismuth nitrate pentahydrate, 1.14 gram of thiourea and 0.36 gram of lysine Dissolve in 72 ml of ethylene glycol, stir and dissolve, add the ethylene glycol solution of thiourea and lysine dropwise to the ethylene glycol solution of bismuth nitrate pentahydrate and lysine, then transfer to 100 ml of crystallization reaction Kettle, thermal crystallization at 160oC for 12 hours. Filter, wash and dry according to conventional methods to obtain black powder. The yellow powder was characterized by X-ray powder diffractometer and scanning electron microscope, and the obtained product was bismuth sulfide microspheres packed in hedgehogs.

[0027] Weigh 1 g of the above-mentioned hedgehog-shaped bismuth sulfide, disperse it in 40 ml of potassium hydroxide aqueous solution with pH=8, then transfer the mixed sol...

Embodiment 2

[0031] According to bismuth nitrate pentahydrate in the reaction mixture: mixed sulfur source (sodium sulfide and thiourea): lysine: the mol ratio of ethylene glycol is 1:1.5:0.25:125, takes by weighing 4.85 grams of bismuth nitrate pentahydrate, a certain amount Sulfur source and 0.36 gram of lysine are dissolved in 72 milliliters of ethylene glycol, after stirring and dissolving, the ethylene glycol solution of thiourea and lysine is added dropwise in the ethylene glycol solution of bismuth nitrate pentahydrate and lysine, Then transferred to a 100 ml crystallization reactor, and crystallized at 160oC for 12 hours. Filter, wash and dry according to conventional methods to obtain a yellow powder. The black powder was characterized by X-ray powder diffractometer and scanning electron microscope, and the obtained product was bismuth sulfide microspheres packed with hedgehogs.

[0032] Weigh 1 g of the above-mentioned hedgehog-shaped bismuth sulfide, disperse it in 40 ml of pot...

Embodiment 3

[0035]According to bismuth nitrate pentahydrate in the reaction mixture: mixed sulfur source (sodium sulfide and thiourea): lysine: the mol ratio of ethylene glycol is 1:1.2:0.25:80, takes by weighing 4.85 grams of bismuth nitrate pentahydrate, a certain amount Sulfur source and 0.36 gram of lysine are dissolved in 45 milliliters of ethylene glycol, after stirring and dissolving, the ethylene glycol solution of thiourea and lysine is added dropwise in the ethylene glycol solution of bismuth nitrate pentahydrate and lysine, Then transferred to a 100 ml crystallization reactor, and crystallized at 160oC for 12 hours. Filter, wash and dry according to conventional methods to obtain a yellow powder. The black powder was characterized by X-ray powder diffractometer and scanning electron microscope, and the obtained product was bismuth sulfide microspheres packed with hedgehogs.

[0036] Weigh 1 g of the above-mentioned hedgehog-shaped bismuth sulfide, disperse it in 40 ml of potas...

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Abstract

The invention provides core-shell-structure bismuth sulfide@bismuth oxide composite microspheres and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving bismuth nitrate pentahydrate and lysine in a glycol solution, dissolving water-soluble sulfide and lysine in a glycol solution, dropwisely adding the glycol solution containing water-soluble sulfide and lysine into the glycol solution containing bismuth nitrate pentahydrate and lysine, transferring the prepared solution into a crystallization reaction kettle, reacting at 60-160 DEG C in a thermostatic oven for 1-12 hours, cooling, filtering, separating, washing with deionized water, washing with anhydrous ethanol, and drying to obtain bismuth sulfide; and (2) dispersing the prepared bismuth sulfide powder into an alkali solution, transferring the solution into a crystallization reaction kettle, reacting at 60-160 DEG C in a thermostatic oven for 1-24 hours, cooling, filtering, separating, washing with deionized water, washing with anhydrous ethanol, and drying to obtain the core-shell-structure bismuth sulfide@bismuth oxide composite. The invention also provides application of the core-shell-structure bismuth sulfide@bismuth oxide composite microspheres as a photocatalyst.

Description

【Technical field】 [0001] The invention relates to the field of photocatalysts, in particular to the preparation and application of a core-shell structure bismuth sulfide bismuth oxide composite microsphere. 【Background technique】 [0002] In the past two decades, the energy crisis, environmental pollution and greenhouse effect have become increasingly serious, which has greatly stimulated people's research interest in the utilization of solar energy. Solar photocatalysis technology is expected to be applied in the fields of hydrogen production by photolysis of water, production of methanol and other organic substances by photocatalytic reduction of carbon dioxide, treatment of environmental pollutants, synthesis of organic materials, and hydrogen production by reforming biomass. The key factor hindering the application of photocatalytic technology is photocatalyst. So far, tens of thousands of photocatalysts have been reported, which can be divided into the following two ca...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J35/08
Inventor 尹双凤陈浪黄锐熊苗袁青贺捷
Owner HUNAN UNIV
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