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Preparation method of Bi2Sn2O7/Ag-AgCl plasma composite photocatalytic nanomaterial

A photocatalytic material and plasma technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, water treatment of special compounds, etc., can solve the problem of low utilization rate of visible light, achieve high stability and reusability, and catalyze Excellent degradation performance, easy to control the effect

Inactive Publication Date: 2017-11-17
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low utilization rate of visible light existing in existing photocatalysts, the invention provides a method for preparing bismuth stannate / silver-silver chloride plasma nanocomposite photocatalytic materials

Method used

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  • Preparation method of Bi2Sn2O7/Ag-AgCl plasma composite photocatalytic nanomaterial
  • Preparation method of Bi2Sn2O7/Ag-AgCl plasma composite photocatalytic nanomaterial
  • Preparation method of Bi2Sn2O7/Ag-AgCl plasma composite photocatalytic nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using sodium chloride as the chlorine source, prepare Bi 2 sn 2 o 7 / Ag-AgCl(NaCl) composite material:

[0029] Weigh 1.41g bismuth oxide and 2.1g tin tetrachloride pentahydrate, dissolve in 20mL hydrochloric acid (10mol / L), slowly add ammonia water dropwise under uninterrupted strong magnetic stirring until the pH value is 12, and continue stirring for 30 minutes , then filtered, washed, and dried to obtain a light yellow intermediate, which was calcined in a high-temperature muffle furnace at 600°C for 3 hours to obtain nano-Bi 2 sn 2 o 7 powder.

[0030] Weigh 0.082g of sodium chloride and dissolve it in 100mL of deionized water, and add 0.4g of prepared nano-Bi 2 sn 2 o 7 Powder in sodium chloride solution, stirred for 1 hour to disperse evenly. Then, 14 mL of silver nitrate solution (0.1 mol / L) was added quickly during continuous stirring, and stirring was continued for 1 hour to form Bi 2 sn 2 o 7 / AgCl complex. Finally, the mixed liquid was placed un...

Embodiment 2

[0042] Photocatalytic degradation experiment:

[0043] Methyl orange and methylene blue are used as target degradants to study the Bi prepared in Example 1. 2 sn 2 o 7 Bi prepared by / Ag-AgCl (NaCl) composite material, comparative example 2 2 sn 2 o 7 / Ag-AgCl (CTAC) composite material, the Ag-AgCl (NaCl) that comparative example 1 makes and Bi 2 sn 2 o 7 Mechanically mixed materials [Bi 2 sn 2 o 7 +Ag-AgCl(NaCl)], Ag-AgCl(CTAC) and Bi prepared in comparative example 3 2 sn 2 o 7 Mechanically mixed materials [Bi 2 sn 2 o 7 +Ag-AgCl(CTAC)] visible light catalytic performance. In the photocatalytic experiment, 0.02 g of the composite material was used as the photocatalyst, and 20 mL of the dye (10 mg / L) was used as the target degradation product. The light source is a 300W xenon lamp (equipped with a 420nm filter), and the photocatalytic experiment is carried out at room temperature. First, the reaction system was placed in a dark environment and stirred for 30...

Embodiment 3

[0049] Catalyst stability test:

[0050] Using a solution of methyl orange to study Bi 2 sn 2 o 7 / Ag-AgCl(NaCl) complex stability. Take 20mL, 10mg / L methyl orange solution in the reaction vessel, then weigh 0.02g photocatalyst and disperse it in the above methyl orange solution, conduct the first photocatalytic experiment, and measure its degradation. After the experiment, the photocatalyst was carefully recovered, fully washed with deionized water, dried in vacuum at room temperature for 2 hours, and then used as a catalyst for the second photocatalytic degradation experiment in the same environment. After the same treatment, the third and fourth experiments were repeated to analyze the degradation of methyl orange in the four experiments.

[0051] The stability of the catalyst is an important factor in determining the practicality. Depend on Figure 5 Bi under visible light 2 sn 2 o 7 / Ag-AgCl(NaCl) complex catalyzed the reproducible experimental results of methyl ...

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Abstract

The invention discloses a preparation method of a Bi2Sn2O7 / Ag-AgCl plasma composite photocatalytic nanomaterial. The method comprises steps as follows: firstly, Bi2Sn2O7 powder is prepared from Bi2O3 and SnCl4.5H2O with a high-temperature solid-phase method, a NaCl solution of Bi2Sn2O7 and AgNO3 are deposited, a Bi2Sn2O7 / AgCl complex is formed, and finally, the Bi2Sn2O7 / Ag-AgCl composite nanomaterial is prepared through photo-reduction. The method adopts a simple technology and is easy to control, and the preparation process is non-toxic and harmless to the environment. The prepared Bi2Sn2O7 / Ag-AgCl plasma composite photocatalytic nanomaterial is uniform in grain size, good in dispersity and high in stability, reusability and visible light absorption performance, and has high electron hole separation efficiency and excellent catalytic degradation performance for organic dyes, thereby having actual application value.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nano-semiconductor composite materials, and in particular relates to a preparation method of bismuth stannate / silver-silver chloride plasma nano-composite materials. Background technique [0002] With the development of urbanization and industrialization, water pollution has become one of the world's environmental pollution problems, seriously threatening the healthy development of human society and disturbing the sustainable development of human beings. As a green technology, semiconductor photocatalysis technology can use sunlight to solve the problem of water pollution, and is expected to become one of the effective ways to solve environmental problems. Of which titanium dioxide (TiO 2 ) as a semiconductor photocatalyst has the advantages of good stability, large specific surface area, strong absorption ability to ultraviolet light, and easy preparation. However, due to TiO 2 It can onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135C02F1/30C02F1/70C02F1/72C02F101/30
CPCC02F1/30C02F1/70C02F1/725B01J27/135C02F2305/10C02F2101/308B01J35/39
Inventor 王田禾赵晓娟崔宏达
Owner NANJING UNIV OF SCI & TECH