Flower type Ho-Bi2WO6 nano powder and preparation method and application thereof

Abstract

The invention discloses flower type Ho-Bi2WO6 nano powder and a preparation method and application thereof. The method comprises the steps of dissolving bismuth nitrate pentahydrate, sodium tungstate dihydrate and holmium nitrate hexahydrate in water at a certain ratio; stirring uniformly and adjusting the pH value to obtain precursor liquid; preserving heat at 140-240 DEG C for 30-120 minutes at the power of 300W by a microwave hydrothermal process to obtain the flower type Ho-Bi2WO6 nano powder, wherein the main component is quadrature-phase Bi2WO6, and the Bi2WO6 contains Ho<3+>. Morphological control is always the direction of semiconductor photocatalyst study, the method disclosed by the invention combines the advantages of microwaves and a hydrothermal process, the technology is simple and easy to control, the preparation period is short, and the flower type Ho-Bi2WO6 nano powder with controllable morphology is prepared without any additive; moreover, the powder has good dispersity, uniform morphology and good photocatalytic activity and can be used for degrading organic matters.

Description

technical field

[0001] The invention belongs to the field of functional materials and relates to a flower-shaped Ho-Bi 2 WO 6 Nanopowder and its preparation method and application. Background technique

[0002] Nanoparticles are in the transition region between atoms and macroscopic materials, endowed with special properties that are different from bulk materials and single molecules. Such a system is neither a typical microscopic system nor a typical macroscopic system. It is a typical mesoscopic system. It usually has a series of novel physicochemical properties, involving fundamental physicochemical issues that are ignored or not available at all in bulk materials. Usually, the specificity of nanomaterials can be attributed to the surface effect, small size effect, quantum size effect and macroscopic quantum tunneling effect. will be significantly different.

[0003] Due to their unique structure and physical and chemical properties, semiconductor materials such as t...

Examples

Embodiment 1

[0032] Flower type Ho-Bi 2 WO 6 The preparation method of nanopowder, comprises the following steps:

[0033] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and a certain amount of Ho(NO 3 ) 3 ·6H 2 O is added to the beaker, where the amount of Ho added is x=2%, x=n Ho / (n Bi +n Ho )×100%, n Bi and n Ho are the molar amounts of Bi and Ho, respectively;

[0034] Step 2: Measure deionized water into the beaker, stir at room temperature for 30 minutes until the raw materials are fully dissolved to form a white suspension, and prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.6mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.3mol / L, and the pH value is adjusted to 1.6 to obtain a precursor solution;

[0035] Step 3: Move the precursor liquid into the microwave hydrothermal reactor lined with polytetrafluoroethylene, control the filling degree of the microwave hydrothermal reactor to 40%, and then p...

Embodiment 2

[0039] Flower type Ho-Bi 2 WO 6 The preparation method of nanopowder, comprises the following steps:

[0040] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and a certain amount of Ho(NO 3 ) 3 ·6H 2 O is added to the beaker, where the amount of Ho added is x=10%, x=n Ho / (n Bi +n Ho )×100%, n Bi and n Ho are the molar amounts of Bi and Ho, respectively;

[0041] Step 2: Measure deionized water into the beaker, stir at room temperature for 60 minutes until the raw materials are fully dissolved to form a white suspension, and prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.1mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.05mol / L, and the pH value is adjusted to 1.8 to obtain a precursor solution;

[0042] Step 3: Move the precursor liquid into the microwave hydrothermal reactor lined with polytetrafluoroethylene, control the filling degree of the microwave hydrothermal reactor to 60%, and then...

Embodiment 3

[0049] Flower type Ho-Bi 2 WO 6 The preparation method of nanopowder, comprises the following steps:

[0050] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and a certain amount of Ho(NO 3 ) 3 ·6H 2 O is added to the beaker, where the amount of Ho added is x=15%, x=n Ho / (n Bi +n Ho )×100%, n Bi and n Ho are the molar amounts of Bi and Ho, respectively;

[0051] Step 2: Measure deionized water into the beaker, stir at room temperature for 40 minutes until the raw materials are fully dissolved to form a white suspension, and prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.2mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.1mol / L, and the pH value is adjusted to 2.0 to obtain a precursor solution;

[0052] Step 3: Move the precursor liquid into the microwave hydrothermal reactor lined with polytetrafluoroethylene, control the filling degree of the microwave hydrothermal reactor to 70%, and then ...

technical field

[0001] The invention belongs to the field of functional materials and relates to a flower-shaped Ho-Bi 2 WO 6 Nanopowder and its preparation method and application. Background technique

[0002] Nanoparticles are in the transition region between atoms and macroscopic materials, endowed with special properties that are different from bulk materials and single molecules. Such a system is neither a typical microscopic system nor a typical macroscopic system. It is a typical mesoscopic system. It usually has a series of novel physicochemical properties, involving fundamental physicochemical issues that are ignored or not available at all in bulk materials. Usually, the specificity of nanomaterials can be attributed to the surface effect, small size effect, quantum size effect and macroscopic quantum tunneling effect. will be significantly different.

[0003] Due to their unique structure and physical and chemical properties, semiconductor materials such as t...

Examples

Embodiment 1

[0032] Flower type Ho-Bi 2 WO 6 The preparation method of nanopowder, comprises the following steps:

[0033] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and a certain amount of Ho(NO 3 ) 3 ·6H 2 O is added to the beaker, where the amount of Ho added is x=2%, x=n Ho / (n Bi +n Ho )×100%, n Bi and n Ho are the molar amounts of Bi and Ho, respectively;

[0034] Step 2: Measure deionized water into the beaker, stir at room temperature for 30 minutes until the raw materials are fully dissolved to form a white suspension, and prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.6mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.3mol / L, and the pH value is adjusted to 1.6 to obtain a precursor solution;

[0035] Step 3: Move the precursor liquid into the microwave hydrothermal reactor lined with polytetrafluoroethylene, control the filling degree of the microwave hydrothermal reactor to 40%, and then p...

Embodiment 2

[0039] Flower type Ho-Bi 2 WO 6 The preparation method of nanopowder, comprises the following steps:

[0040] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and a certain amount of Ho(NO 3 ) 3 ·6H 2 O is added to the beaker, where the amount of Ho added is x=10%, x=n Ho / (n Bi +n Ho )×100%, n Bi and n Ho are the molar amounts of Bi and Ho, respectively;

[0041] Step 2: Measure deionized water into the beaker, stir at room temperature for 60 minutes until the raw materials are fully dissolved to form a white suspension, and prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.1mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.05mol / L, and the pH value is adjusted to 1.8 to obtain a precursor solution;

[0042] Step 3: Move the precursor liquid into the microwave hydrothermal reactor lined with polytetrafluoroethylene, control the filling degree of the microwave hydrothermal reactor to 60%, and then...

Embodiment 3

[0049] Flower type Ho-Bi 2 WO 6 The preparation method of nanopowder, comprises the following steps:

[0050] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was put into a beaker, and a certain amount of Ho(NO 3 ) 3 ·6H 2 O is added to the beaker, where the amount of Ho added is x=15%, x=n Ho / (n Bi +n Ho )×100%, n Bi and n Ho are the molar amounts of Bi and Ho, respectively;

[0051] Step 2: Measure deionized water into the beaker, stir at room temperature for 40 minutes until the raw materials are fully dissolved to form a white suspension, and prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.2mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.1mol / L, and the pH value is adjusted to 2.0 to obtain a precursor solution;

[0052] Step 3: Move the precursor liquid into the microwave hydrothermal reactor lined with polytetrafluoroethylene, control the filling degree of the microwave hydrothermal reactor to 70%, and then ...

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