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a kind of ag 2 oQuantum dot hybrid znin 2 the s 4 Preparation method of nanosheet p-n type composite photocatalyst

A nanosheet, composite light technology, applied in physical/chemical process catalysts, chemical instruments and methods, special compound water treatment, etc., can solve problems affecting the popularization and application of photocatalytic technology, low photoelectric conversion efficiency, incomplete utilization of light sources, etc , to achieve the effect of being conducive to large-scale production, short preparation cycle, and promoting effective separation

Active Publication Date: 2021-05-25
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 is rapidly degraded; 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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  • a kind of ag <sub>2</sub> oQuantum dot hybrid znin <sub>2</sub> the s <sub>4</sub> Preparation method of nanosheet p-n type composite photocatalyst
  • a kind of ag <sub>2</sub> oQuantum dot hybrid znin <sub>2</sub> the s <sub>4</sub> Preparation method of nanosheet p-n type composite photocatalyst
  • a kind of ag <sub>2</sub> oQuantum dot hybrid znin <sub>2</sub> the s <sub>4</sub> Preparation method of nanosheet p-n type composite photocatalyst

Examples

Experimental program
Comparison scheme
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 The nanosheet suspension was stirred for 30 min in the dark, 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 de...

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 nanosheet suspension 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 degradation ef...

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Abstract

The invention belongs to the field of preparation of inorganic nanocomposite materials and environmental treatment, and specifically discloses Ag with excellent visible light activity. 2 O quantum dot hybrid ZnIn 2 S 4 A preparation method of nanosheet p-n type composite photocatalyst. The method uses ZnIn 2 S 4 Using nanosheets and silver nitrate as raw materials, different proportions of Ag were prepared by in-situ method 2 O quantum dot hybrid ZnIn 2 S 4 Nanosheet p‑n type composite photocatalyst. Ag prepared by the present invention 2 O quantum dots / ZnIn 2 S 4 The nanosheet p-n type composite photocatalyst can be applied to efficiently degrade the antibiotic tetracycline hydrochloride under visible light. The invention has the advantages of environment-friendly preparation of raw materials, simple method, mild hybridization reaction conditions, short cycle and low cost. Ag 2 O quantum dot hybrid ZnIn 2 S 4 Nanosheet is a novel p-n type composite photocatalyst, the present invention is the first report to synthesize this composite photocatalyst, Ag 2 O quantum dot hybrid ZnIn 2 S 4 The nanosheets exhibit excellent photocatalytic degradation activity and have important application prospects 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 is rapidly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04C02F1/30C02F1/72C02F101/38C02F101/34C02F101/36
CPCC02F1/30C02F1/725B01J27/04C02F2305/10C02F2101/36C02F2101/34C02F2101/38B01J35/39B01J35/23
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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