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Gold-bismuth oxychloride nano composite material and preparation method thereof

A technology of bismuth oxychloride nano and composite materials, which is applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of small specific surface area of ​​products, difficult surface modification of gold nanoparticles, energy consumption and time-consuming, etc. Achieve the effects of simple preparation method, controllable structural parameters and simple process

Inactive Publication Date: 2017-04-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this product also has photocatalytic efficiency, there are deficiencies in both the preparation method and the product. First, the specific surface area of ​​the product is too small, which is not conducive to sufficient contact with organic pollutants; It is difficult for the gold nanoparticles to play the role of surface modification; again, the preparation method is energy-consuming and time-consuming, and organic surfactants or structure-directing agents need to be added, which not only makes it difficult to control the structural parameters of the product, but also the remaining organic matter. It will reduce its photocatalytic performance and the number of times of recycling

Method used

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  • Gold-bismuth oxychloride nano composite material and preparation method thereof
  • Gold-bismuth oxychloride nano composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The concrete steps of preparation are:

[0035] In step 1, the gold target is first placed in a stirred precursor solution, wherein the bismuth nitrate in the precursor solution is 0.08 mol / L, and the chloride content is 0.5 mol / L; the chloride is hydrogen chloride. Then use a laser with a wavelength of 532nm, a repetition rate of 1Hz, a pulse width of 15ns, and a power of 40mJ / pulse to irradiate the gold target for 30min; wherein, the laser with an emission wavelength of 532nm is a Nd:YAG solid-state laser, and the laser spot diameter is 0.5 mm to obtain a mixed colloid solution.

[0036] Step 2, the mixed colloidal solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation treatment is centrifugation, the rotation speed is 1000r / min, and the time is 20min, and the washing treatment is obtained by using deionized water to separate The solid matter is cleaned twice, the solid matter is separated by centrifugat...

Embodiment 2

[0038] The concrete steps of preparation are:

[0039] In step 1, the gold target is first placed in a stirred precursor solution, wherein the bismuth nitrate in the precursor solution is 0.09 mol / L, and the chloride content is 0.3 mol / L; the chloride is hydrogen chloride. Then use a laser with a wavelength of 532nm, a repetition rate of 5Hz, a pulse width of 13ns, and a power of 60mJ / pulse to irradiate the gold target for 28 minutes; the laser with an emission wavelength of 532nm is a Nd:YAG solid-state laser, and the laser spot diameter is 1mm , to obtain a mixed colloidal solution.

[0040] Step 2, the mixed colloidal solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotation speed is 3750r / min, and the time is 15min, and the washing process is obtained by using deionized water to separate The solid matter is cleaned twice, and the solid matter is separated by centrifugation...

Embodiment 3

[0042] The concrete steps of preparation are:

[0043] In step 1, the gold target is first placed in a stirred precursor solution, wherein the bismuth nitrate in the precursor solution is 0.1 mol / L, and the chloride content is 0.01 mol / L; the chloride is hydrogen chloride. Then use a laser with a wavelength of 532nm, a repetition rate of 10Hz, a pulse width of 10ns, and a power of 80mJ / pulse to irradiate the gold target for 25 minutes; wherein, the laser with an emission wavelength of 532nm is a Nd:YAG solid-state laser, and the laser spot diameter is 1.5 mm to obtain a mixed colloid solution.

[0044]Step 2, the mixed colloidal solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotation speed is 6500r / min, and the time is 10min, and the washing process is obtained by using deionized water to separate The solid matter is cleaned twice, and the solid matter is separated by centri...

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Abstract

The invention discloses a gold-bismuth oxychloride nano composite material and a preparation method thereof. The composite material is composed of bismuth oxychloride and gold nanoparticles, wherein bismuth oxychloride has a shape of nanosheets or microflowers; the sheet length of the bismuth oxychloride nanosheets is 200-2000 nm, the sheet width is 200-2000 nm, and the thickness is 10-25 nm; the diameter of the bismuth oxychloride microflowers is 2-6 [mu]m and is composed of the bismuth oxychloride nanosheets; the gold nanoparticles are supported on the bismuth oxychloride nanosheets, and have the particle diameter of 10-30 nm. The method comprises the steps of firstly placing a gold target in a precursor solution prepared from bismuth nitrate and chloride under stirring, irradiating the gold target by using laser, and then carrying out solid-liquid separation, washing and drying treatment of the obtained mixed colloidal solution, to prepare the target product. The composite material has high visible light photocatalytic efficiency and can be easily widely applied in degradation of organic pollutants under visible light irradiation.

Description

technical field [0001] The invention relates to a nanocomposite material and a preparation method thereof, in particular to a gold-bismuth oxychloride nanocomposite material and a preparation method thereof. Background technique [0002] Bismuth oxychloride (BiOCl) is a multi-component compound semiconductor. Due to its unique layered structure and energy band structure that can be excited by light, it has potential application value as a new type of photocatalyst in the degradation of organic pollutants. However, since the bandgap width of bismuth oxychloride is in the ultraviolet region (~3.5eV), the degradation efficiency is very low under visible light irradiation. For this reason, people try to improve its photocatalytic performance in the visible light region through a series of measures such as surface modification, exposure control and heterogeneous structure; , Talanta, 156-157(2016) 257-264 ("Photoelectrochemical detection of p-4-chlorophenol based on Au / BiOCl nan...

Claims

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Application Information

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IPC IPC(8): B01J27/06B22F9/16B82Y30/00B82Y40/00A62D3/17A62D101/20
CPCA62D3/17B82Y30/00B82Y40/00B01J27/06B22F9/16A62D2101/20B01J35/39
Inventor 张洪文魏懿符浩蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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