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 she

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

Example Embodiment

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

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

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

[0028] (3) After the reaction is completed, take out the reaction kettle and cool to room temperature naturally.

[0029] (4) Take out the precipitate obtained from the reaction, alternately wash with deionized water and absolute ethanol three times, respectively, after each washing is completed, centrifuged to obtain the desired product.

[0030] figure 1 The X-ray powder diffraction patterns (a-d are 3, 6, 18, 24h, respectively) of...

Example Embodiment

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

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

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

[0034] (3) After the reaction is completed, take out the reaction kettle and cool to room temperature naturally.

[0035] (4) Take out the precipitate obtained from the reaction, alternately wash with deionized water and absolute ethanol three times, respectively, after each washing is completed, centrifuged to obtain the desired product.

[0036] image 3 The SEM picture of the product produced by the reaction temperature of 120℃ and the reaction time of 6, 18, 24h (ac) i...

Example Embodiment

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

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

[0039] (2) Then 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.

[0040] (3) After the reaction is completed, take out the reaction kettle and cool to room temperature naturally.

[0041] (4) Take out the precipitate obtained from the reaction, alternately wash with deionized water and absolute ethanol three times, respectively, after each wash is completed, centrifuged to obtain the desired product.

[0042] SEM photo of the product ( image 3 a-d) shows that the reaction time is 2h, and the product obtained is a lar...

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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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