Preparation method of Ag2O quantum dot hybrid ZnIn2S4 nanosheet p-n type composite photocatalyst

A technology of znin2s4 and nanosheets, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and water treatment of special compounds, and can solve problems that affect the promotion and application of photocatalytic technology, incomplete use of light sources, and low photoelectric conversion efficiency. Achieve the effects of large-scale production, short preparation cycle, and green reaction conditions

Active Publication Date: 2019-03-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the development of ultraviolet photocatalysis technology is the most comprehensive, and more than 3000 kinds of refractory organic compounds can pass through nano-TiO under the irradiation of ultraviolet rays. 2 Or ZnO degrades rapidly; however, ultraviolet light is less than 5% in the solar spectrum energy distribution, the light source is not fully utilized, and the photoelectric conversion efficiency is low, which seriously affects the popularization and application of photocatalytic technology
However, its wide application is limited due to the easy recombination of photogenerated electron-hole pairs generated under visible light excitation.

Method used

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  • Preparation method of Ag2O quantum dot hybrid ZnIn2S4 nanosheet p-n type composite photocatalyst
  • Preparation method of Ag2O quantum dot hybrid ZnIn2S4 nanosheet p-n type composite photocatalyst
  • Preparation method of Ag2O quantum dot hybrid ZnIn2S4 nanosheet p-n type composite photocatalyst

Examples

Experimental program
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Effect test

example 1

[0022] (1) Weigh 0.099g of ZnIn 2 S 4 Nanosheets were added to 10mL of methanol, stirred for 10min, and then ultrasonicated for 10min, repeated three times to obtain uniformly dispersed ZnIn 2 S 4 nanosheet suspension;

[0023] (2) Measure 0.916mL of AgNO with a concentration of 0.8g / L 3 Methanol solution is added to the uniformly dispersed ZnIn prepared in step (1) 2 S 4 Nanosheet suspension was stirred in the dark for 30 min, and then 21.6 μL of NaOH aqueous solution with a concentration of 0.4 mol / L was added dropwise, in which AgNO 3 The molar ratio with NaOH was 1:2, and continued to stir for 60 min. After the reaction, the obtained product was washed several times with deionized water and absolute ethanol, and dried in vacuum to obtain Ag 2 O quantum dot hybrid ZnIn 2 S 4 Nanosheet p-n type composite photocatalyst, in which Ag 2The mass fraction of O quantum dots is 0.5%.

[0024] (3) The sample was irradiated under visible light for 100 minutes, and the degrad...

example 2

[0026] (1) Weigh 0.15g of ZnIn 2 S 4 Nanosheets were added to 20mL of methanol, stirred for 15min, and then ultrasonicated for 10min, repeated three times to obtain uniformly dispersed ZnIn 2 S 4 nanosheet suspension;

[0027] (2) Measure 1.83mL of AgNO with a concentration of 1.2g / L 3 Methanol solution is added to the uniformly dispersed ZnIn prepared in step (1) 2 S 4 The nanosheet suspension was stirred for 40 min in the dark, and then 32.4 μL of NaOH aqueous solution with a concentration of 0.8 mol / L was added dropwise, in which AgNO 3 The molar ratio with NaOH was 1:2, and continued to stir for 80 min. After the reaction was over, the obtained product was washed several times with deionized water and absolute ethanol, and dried in vacuum to obtain Ag 2 O quantum dot hybrid ZnIn 2 S 4 Nanosheet p-n type composite photocatalyst, in which Ag 2 The mass fraction of O quantum dots is 1%.

[0028] (3) The sample was irradiated under visible light for 100 min, and the ...

example 3

[0031] (1) Weigh 0.2g of ZnIn 2 S 4 Nanosheets were added to 30mL of methanol, stirred for 20min, and then ultrasonicated for 15min, repeated three times to obtain uniformly dispersed ZnIn 2 S 4 nanosheet suspension;

[0032] (2) Measure 4.54mL of AgNO with a concentration of 2g / L 3 Methanol solution is added to the uniformly dispersed ZnIn prepared in step (1) 2 S 4 The suspension of nanosheets was stirred in the dark for 50 min, and then 133.8 μL of NaOH aqueous solution with a concentration of 1.2 mol / L was added dropwise, in which AgNO 3 The molar ratio with NaOH is 1:3, continue to stir for 100min, after the reaction is over, wash the obtained product several times with deionized water and absolute ethanol, and dry it in vacuum to obtain Ag 2 O quantum dot hybrid ZnIn 2 S 4 Nanosheet p-n type composite photocatalyst, in which Ag 2 The mass fraction of O quantum dots is 3%.

[0033] (3) The sample was irradiated under visible light for 100 min, and the degradatio...

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Abstract

The invention belongs to the fields of preparation of inorganic nano composite materials and environmental treatment, and in particular discloses a preparation method of Ag2O quantum dot hybrid ZnIn2S4 nanosheet p-n type composite photocatalyst with excellent visible light activity. According to the method, ZnIn2S4 nanosheets and silver nitrate are used as raw materials, and the Ag2O quantum dot hybrid ZnIn2S4 nanosheet p-n type composite photocatalyst with different ratios is prepared by using an in-situ method. The prepared Ag2O quantum dot / ZnIn2S4 nanosheet p-n type composite photocatalystcan be used for efficiently degrading antibiotic tetracycline hydrochloride under visible light. The preparation method has the advantages of environment-friendly preparation raw materials, simple andmild hybridization reaction conditions, short cycle, low cost, and the like. An Ag2O quantum dot hybrid ZnIn2S4 nanosheet is a novel p-n type composite photocatalyst. The preparation method reports the synthesis of such composite photocatalyst for the first time. The Ag2O quantum dot hybrid ZnIn2S4 nanosheet shows excellent photocatalytic degradation activity, and has an important application prospect in the treatment of antibiotics in wastewater.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials and relates to an Ag 2 O quantum dot hybrid ZnIn 2 S 4 Preparation method of nanosheet p-n type composite photocatalyst and its application in the field of environmental treatment. Background technique [0002] With the continuous development of modern industrialization, water pollution has become one of the important problems restricting the survival and development of human beings; and the photocatalytic oxidation degradation technology based on semiconductor materials can use sunlight to degrade pollutants, which has high efficiency, low consumption, and no pollution. It is a wastewater treatment technology with broad application prospects. At present, the development of ultraviolet photocatalysis technology is the most comprehensive, and more than 3000 kinds of refractory organic compounds can pass through nano-TiO under the irradiation of ultraviolet rays. 2 Or ZnO degrades ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F1/72C02F101/38C02F101/34C02F101/36
CPCB01J27/04B01J35/0013B01J35/004C02F1/30C02F1/725C02F2101/34C02F2101/36C02F2101/38C02F2305/10
Inventor 彭志远周翔宇张文莉蒋银花景旋张申肖艳杨心砚
Owner JIANGSU UNIV
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