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Preparing method for flower-shaped BiOI microspheres

A microsphere and flower-shaped technology, which is applied in the field of preparation of flower-shaped BiOI microspheres, to improve adsorption performance, improve photocatalytic activity, and meet the effects of environmental protection

Inactive Publication Date: 2015-12-16
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of BiOI microspheres under hydrothermal conditions using ionic liquid microemulsions as templates has not been reported yet.

Method used

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  • Preparing method for flower-shaped BiOI microspheres
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  • Preparing method for flower-shaped BiOI microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of flower-shaped BiOI microspheres, the steps are:

[0039] The first step, dissolving bismuth nitrate in acid solution, obtains solution A; acid solution is nitric acid solution, wherein, the molar ratio of described nitric acid and bismuth nitrate is 2:1, because hydrochloric acid, sulfuric acid all react with bismuth nitrate to form Precipitation is not conducive to the preparation of flower-shaped BiOI microspheres, so nitric acid is used, and the concentration of nitric acid is higher than that of bismuth nitrate, so that bismuth nitrate is easily soluble.

[0040] In the second step, the ionic liquid iodide 1-butyl-3-methylimidazole and the nonionic surfactant PVP are dissolved in distilled water, and magnetically stirred at room temperature for 1 hour to form microemulsion B; the ionic liquid iodide 1-butyl-3 -The ratio of the mass of methylimidazole to the volume of distilled water is 0.533~1.065:25g / mL, and the mass ratio of ionic liquid io...

Embodiment 2

[0052] The method for preparing flower-shaped BiOI microspheres in the present embodiment is the same as in Example 1, wherein, 0.97gBi(NO 3 ) 3 Dissolve in 5mL nitric acid (0.8mol·L -1 ) solution to obtain solution A; 0.533g[Bmin]I and 0.107gPVP were dissolved in 25mL water to obtain microemulsion B; then solution A was mixed with microemulsion B, and mixed with 2mol L -1 The pH of the NaOH solution was adjusted to 1, and after stirring for 2 h, a uniformly distributed solution was obtained. The above solution was poured into a 50mL autoclave, and heated in water at a temperature of 100°C for 12h. After the reaction, the product was washed with deionized water and absolute ethanol twice, filtered, and dried to obtain flower-shaped BiOI microspheres.

Embodiment 3

[0054] 0.97gBi(NO 3 ) 3 Dissolve in 5mL nitric acid (0.8mol·L -1 ) solution to obtain solution A; 0.8g[Bmin]I and 0.8gPVP were dissolved in 25mL water to obtain microemulsion B; then solution A was mixed with microemulsion B, and mixed with 2mol L -1 The NaOH solution was used to adjust the pH to 2, and after stirring for 1.5, a uniformly distributed solution was obtained. The above solution was poured into a 50mL autoclave, and heated in water at a temperature of 140°C for 12h. After the reaction, the product was washed with deionized water and absolute ethanol twice, filtered, and dried to obtain flower-shaped BiOI microspheres.

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Abstract

The invention relates to a preparing method for flower-shaped BiOI microspheres, and belongs to the field of nanometer photocatalytic material preparing. The preparing method includes the following specific preparing steps that bismuth nitrate is added into nitric acid to obtain a solution A; ionic liquid [Bmin]I and nonionic surfactants PVP are added into distilled water, heated and stirred to form micro-emulsion B; then the solution A and the micro-emulsion B are mixed to be poured into a high pressure kettle, the pH is controlled to range from 1 to 4, centrifuging, washing and drying are carried out after a hydrothermal reaction, and the flower-shaped BiOI microspheres are obtained. According to the preparing method, an ionic liquid micro-emulsion method is adopted for the first time, no organic solvent is added, and the environment-friendly requirement is met; ionic liquid is used as an iodine source and solvents, is also used as an oil phase to form micro-emulsion drops and has the important effect on forming of the flower-shaped BiOI microspheres; the prepared flower-shaped BiOI microspheres have the high application value in the fields of pollution treatment, new energy preparing, selectivity catalytic oxidation and the like.

Description

technical field [0001] The invention belongs to the field of preparation of nano photocatalytic materials, in particular to a preparation method of flower-shaped BiOI microspheres. Background technique [0002] With the rapid development of industry, human beings have created increasingly serious environmental problems while creating great civilization and wealth. In particular, the problem of water pollution has attracted more and more attention. Semiconductor photocatalysis technology has a remarkable effect in treating some refractory pollutants in water. Currently, TiO 2 It is the most widely and deeply researched photocatalyst. However, titanium dioxide has a wide bandgap, which only responds to ultraviolet light, but cannot absorb visible light, which accounts for most of sunlight, which greatly limits the ability of TiO 2 practical application. Therefore, seeking new and efficient visible light catalysts is an inevitable trend for further development. [0003] B...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J37/10B01J35/10C02F1/30B01D53/86
Inventor 孙成茅丹俊丁珊珊喻安晴杨绍贵何欢
Owner NANJING UNIV
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