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Method for preparing nano-sheet assembled bismuthyl bromide superstructure by adjusting and controlling surfactant

A technology of surfactant and bismuth oxybromide, which is applied in chemical instruments and methods, solution from normal temperature liquid solvent, single crystal growth, etc., can solve the problems of unfavorable environmental protection, rational application of resources, difficult control of product size, high production cost, etc. problem, to achieve good visible light photocatalytic performance, easy industrial operation, and good crystallinity

Inactive Publication Date: 2010-04-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned method provides the approach of large-scale synthesis of bismuth oxybromide nano / micro materials, there are still deficiencies: due to its own crystal growth habit of bismuth oxybromide, the resulting product is often a single nano / micro-scale sheet structure, And the size of the product is not easy to control
In addition, the adjustment of the acidity of the solution will also result in higher production costs and complicated processes, which is not conducive to environmental protection and rational use of resources.

Method used

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  • Method for preparing nano-sheet assembled bismuthyl bromide superstructure by adjusting and controlling surfactant
  • Method for preparing nano-sheet assembled bismuthyl bromide superstructure by adjusting and controlling surfactant
  • Method for preparing nano-sheet assembled bismuthyl bromide superstructure by adjusting and controlling surfactant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of flake-like cross-assembled pompom-like and flower-like bismuth oxybromide superstructures

[0026] (1) In a 50ml beaker, add 9ml of ethylene glycol as a solvent, and add 0.5×10 -3 mol Bi(NO 3 ) 3 .5H 2 O, 0.5×10 -3 mol of CTAB and 0.2g of PEG4000, after stirring evenly, transfer the precursor into a 12ml reaction kettle with a straw, and seal the reaction kettle;

[0027] (2) Transfer the reaction kettle to a temperature-controlled furnace, control the reaction temperature to 120° C., and heat at this temperature for 3, 6, 18, and 24 hours respectively.

[0028] (3) After the reaction was completed, the reactor was taken out and cooled to room temperature naturally.

[0029] (4) Take out the precipitate obtained in the reaction, wash it three times with deionized water and absolute ethanol alternately, and centrifuge after each washing to obtain the desired product.

[0030] figure 1 The X-ray powder diffraction patterns of the products ...

Embodiment 2

[0031] Example 2: Preparation of rosette-shaped bismuth oxybromide superstructure

[0032] (1) Add 9ml of ethylene glycol as a solvent to a 50ml beaker, and add 0.5×10 -3 mol Bi(NO 3 ) 3 .5H 2 O, 0.5×10 -3 mol of CTAB and 0.2g of PVP4000, after stirring evenly, transfer the precursor into a 12ml reaction kettle with a straw, and seal the reaction kettle;

[0033] (2) Transfer the reaction kettle to a temperature-controlled furnace, control the reaction temperature to 120° C., and heat at this temperature for 6, 18, and 24 hours respectively.

[0034] (3) After the reaction was completed, the reactor was taken out and cooled to room temperature naturally.

[0035] (4) Take out the precipitate obtained in the reaction, wash it three times with deionized water and absolute ethanol alternately, and centrifuge after each washing to obtain the desired product.

[0036] image 3 Shown are the SEM photographs of the products produced at a reaction temperature of 120°C and control...

Embodiment 3

[0037] Example 3: Preparation of pistachio-shaped and pistachio-shaped bismuth oxybromide superstructures

[0038] (1) In a 50ml beaker, add 9ml of ethylene glycol as a solvent, and add 0.5×10 -3 mol Bi(NO 3 ) 3 .5H 2 O, 0.5×10 -3 mol of NaBr and 0.2g of PVP4000, after stirring evenly, transfer the precursor into a 12ml reaction kettle with a straw, and seal the reaction kettle;

[0039] (2) Transfer the reaction kettle to a temperature-controlled furnace, control the reaction temperature to 120° C., and heat at this temperature for 2, 12, 24, and 48 hours respectively.

[0040] (3) After the reaction was completed, the reactor was taken out and cooled to room temperature naturally.

[0041] (4) Take out the precipitate obtained in the reaction, wash it three times with deionized water and absolute ethanol alternately, and centrifuge after each washing to obtain the desired product.

[0042] The SEM photo of the product ( image 3 a-d) show that: the reaction time is 2 ...

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Abstract

The invention belongs to the fields of nano / micron material preparation technology and hydro-thermal synthesis technology, and particularly relates to a method for preparing a nano-sheet assembled bismuthyl bromide superstructure by adjusting and controlling a surfactant. The method comprises the following steps: using bismuth nitrate, sodium bromide or hexadecyl trimethyl ammonium bromide as a reactant, adding PEG4000 or PVP4000 as an adjusting and controlling agent, using ethanediol as a solvent, preparing a precursor solution under ultrasonic agitation, and moving the precursor solution into a hydro-thermal reaction kettle in a packing ratio of between 60 and 80 percent; putting the hydro-thermal reaction kettle filled with the mixture into a box-type resistance furnace, heating the kettle to a temperature of between 90 and 150 DEG C, keeping the temperature for 2 to 48 hours, taking the kettle out of the furnace, and cooling the kettle to the room temperature naturally; and washing and centrifugally separating the mixture in the kettle to obtain the required product. The method has the advantages of simple process, easy construction of a whole preparation system, simple and convenient operation, easily controlled condition, low cost, easily controlled product shape and size, high purity, good crystallinity and convenient processing of the product, and is suitable for large scale industrial production.

Description

technical field [0001] The invention belongs to the field of nano / micro material preparation technology and hydrothermal synthesis technology, and specifically relates to a method for preparing nanosheets to assemble a bismuth oxybromide superstructure through the regulation and control of surfactants. Background technique [0002] Bismuth is a p-block element, and its valence in oxygen-containing compounds is generally +3. Bi 3+ There are two valence electrons 6S in the outermost s electron shell of 2 . In the oxide system, due to the strong anti-bonding interaction between the s-occupied orbitals of Bi and the s- and p-orbitals of oxygen, energetically more favorable coordination is often obtained through the deformation of the local coordination environment. The reduced symmetry favors hybridization between the ion-filled s-orbital (HOMO) and the empty p-orbital (LUMO), leading to the Bi 3+ The formation of lone pairs of electrons with stereoactivity. Bi with lone pai...

Claims

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Application Information

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IPC IPC(8): C30B29/10C30B29/68C30B7/10
Inventor 吴庆生陈义军朱子春
Owner TONGJI UNIV
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