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

A technology of core-shell structure and bismuth sulfide, applied 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 efficiency of photo-induced electron-hole separation, etc. problems, to achieve the effect of regular and controllable morphology, controllable crystal phase and simple process

Active Publication Date: 2015-05-20
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 the molar ratio of bismuth nitrate pentahydrate: thiourea: lysine: ethylene glycol in the reaction mixture as 1:1.5:0.25:125, weigh 4.85 g of bismuth nitrate pentahydrate, 1.14 g of thiourea and 0.36 g of lysine Dissolve in 72 ml of ethylene glycol. After stirring to dissolve, add the ethylene glycol solution of thiourea and lysine to the ethylene glycol solution of bismuth nitrate pentahydrate and lysine, and then transfer to 100 ml of crystallization reaction The kettle was heated and crystallized at 160°C for 12 hours. Filter, wash and dry to obtain black powder according to conventional methods. The yellow powder was characterized by X-ray powder diffractometer, scanning electron microscope, etc., and the product was hedgehog bismuth sulfide microspheres.

[0027] Weigh 1 gram of the hedgehog-shaped bismuth sulfide and disperse it in 40 ml of a potassium hydroxide aqueous solution with pH=8, then transfer the mixed solution to a crystallization reactor an...

Embodiment 2

[0031] According to the molar ratio of bismuth nitrate pentahydrate: mixed sulfur source (sodium sulfide and thiourea): lysine: ethylene glycol in the reaction mixture is 1:1.5:0.25:125, weigh 4.85 g of bismuth nitrate pentahydrate, a certain amount Sulfur source and 0.36 g of lysine were dissolved in 72 ml of ethylene glycol. After stirring to dissolve, the ethylene glycol solution of thiourea and lysine was added dropwise to the ethylene glycol solution of bismuth nitrate pentahydrate and lysine. Then transfer to a 100 ml crystallization reactor and crystallize at 160°C for 12 hours. Filter, wash, and dry according to conventional methods to obtain yellow powder. The black powder was characterized by X-ray powder diffractometer, scanning electron microscope, etc., and the product was hedgehog bismuth sulfide microspheres.

[0032] Weigh 1 g of the hedgehog-shaped bismuth sulfide and disperse it in 40 ml of a potassium hydroxide aqueous solution with pH=8, then transfer the mix...

Embodiment 3

[0035] According to the molar ratio of bismuth nitrate pentahydrate: mixed sulfur source (sodium sulfide and thiourea): lysine: ethylene glycol in the reaction mixture is 1:1.2:0.25:80, weigh 4.85 g of bismuth nitrate pentahydrate, a certain amount Sulfur source and 0.36 g of lysine are dissolved in 45 ml of ethylene glycol. After stirring to dissolve, the ethylene glycol solution of thiourea and lysine is added dropwise to the ethylene glycol solution of bismuth nitrate pentahydrate and lysine. Then transfer to a 100 ml crystallization reactor and crystallize at 160°C for 12 hours. Filter, wash, and dry according to conventional methods to obtain yellow powder. The black powder was characterized by X-ray powder diffractometer, scanning electron microscope, etc., and the product was hedgehog bismuth sulfide microspheres.

[0036] Weigh 1 g of the hedgehog-shaped bismuth sulfide and disperse it in 40 ml of a potassium hydroxide aqueous solution with pH=8, then transfer the mixed ...

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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 structured bismuth sulfide bismuth oxide composite microsphere. 【Background technique】 [0002] In the past two decades, the energy crisis, environmental pollution and greenhouse effect have become more and more serious, which has greatly stimulated people's research interest in solar energy utilization. Solar photocatalytic technology is expected to be used in the fields of photolysis of water to produce hydrogen, carbon dioxide photocatalytic reduction to produce methanol and other organic substances, treatment of environmental pollutants, organic material synthesis, and biomass reforming to produce hydrogen. 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 categories: One is based on TiO 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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