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A sns with s vacancy 2 Preparation of Nanosheets and Its Application in Photodegradation of cr(ⅵ)

A nanosheet and vacancy technology, applied in the field of environmental protection and pollutant degradation, can solve the problems of low reduction efficiency and slow reduction speed, and achieve the effects of low cost, improved removal rate, and simple preparation process.

Active Publication Date: 2021-12-28
江苏悟晴电子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, CdS, SnS 2 、Ag 2 S and WO 3 It is widely used in the photocatalytic reduction of Cr(VI) under visible light, but its reduction efficiency is low and the reduction speed is slow.

Method used

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  • A sns with s vacancy <sub>2</sub> Preparation of Nanosheets and Its Application in Photodegradation of cr(ⅵ)
  • A sns with s vacancy <sub>2</sub> Preparation of Nanosheets and Its Application in Photodegradation of cr(ⅵ)
  • A sns with s vacancy <sub>2</sub> Preparation of Nanosheets and Its Application in Photodegradation of cr(ⅵ)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) SnS without S vacancies 2 The preparation method of nanosheet: carry out successively according to the following steps:

[0039] SnCl with a concentration of 2g / L 4 ·5H 2 O and thioacetamide with a concentration of 1.7 g / L were added to 40 mL of ethylene glycol, and ultrasonicated for 0.5 h at room temperature, and the thioacetamide solution was added to the SnCl 4 ·5H 2 O solution was stirred for 1 h, and the resulting suspension was transferred to a 100 mL high-pressure hydrothermal reactor with a polytetrafluoroethylene liner, and heated at 140 °C for 10 h; after cooling to room temperature, a yellow suspension was collected, and the yellow suspension was used for Alternately washed with ethanol and deionized water for several times, and finally dried in a vacuum oven at 60°C for 8 hours to obtain SnS 2 nanosheets; attached figure 1 This is a good illustration of its ultra-thin structural features.

[0040] (2) SnS without S vacancies 2 The method for phot...

Embodiment 2

[0045] (1) Preparation method of SnS2 nanosheets without S vacancies: follow the steps below:

[0046] SnCl with a concentration of 3g / L 4 ·5H 2 O and thioacetamide with a concentration of 3.4 g / L were added to 40 mL of ethylene glycol, sonicated at room temperature for 1 h, and the thioacetamide solution was added to the SnCl 4 ·5H 2 O solution was stirred for 1.5h, and the resulting suspension was transferred to a 100mL high-pressure hydrothermal reactor lined with Teflon, and heated at 160°C for 12h; after cooling to room temperature, a yellow suspension was collected, yellow suspension Alternately wash with ethanol and deionized water several times, and finally dry in a vacuum oven at 60°C for 8 hours to obtain SnS 2 Nanosheets.

[0047] (2) Use the method described in Example 1 to photodegrade the hexavalent chromium Cr(VI) of the sample obtained in the example. The test absorbance is 0.422, and the degradation rate is calculated to be 27%.

Embodiment 3

[0049] (1) SnS without S vacancies 2 The preparation method of nanosheet: carry out successively according to the following steps:

[0050] SnCl with a concentration of 4g / L 4 ·5H 2 O and thioacetamide with a concentration of 10.2 g / L were added to 40 mL of ethylene glycol, and ultrasonicated for 2 h at room temperature, and the thioacetamide solution was added to the SnCl 4 ·5H 2 O solution was stirred for 2h, and the resulting suspension was transferred to a 100mL high-pressure hydrothermal reactor lined with polytetrafluoroethylene, and heated at 180°C for 16h; after cooling to room temperature, a yellow suspension was collected, and the yellow suspension was used for Alternately washed with ethanol and deionized water for several times, and finally dried in a vacuum oven at 60°C for 8 hours to obtain SnS 2 Nanosheets.

[0051] (2) Use the method described in Example 1 to photodegrade the hexavalent chromium Cr(VI) of the sample obtained in the example. The test absorb...

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Abstract

A SnS with S vacancies 2 The preparation of nanosheets and their application in photodegradation of Cr(VI) belong to the technical field of environmental protection and pollutant degradation. SnS obtained in step 1 2 The nanosheets were calcined at high temperature in a hydrogen / argon mixed gas, then cooled to room temperature, and the collected powder was SnS with S vacancies 2 Nanosheets. Photodegradation results reveal ultrathin SnS with abundant S vacancies within 1 h 2 The removal rate of the nanosheets for hexavalent chromium Cr(Ⅵ) reached 98%, which is much higher than that of SnS without S vacancies. 2 Nanosheets, the degradation rate is only 31%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and pollutant degradation, in particular to a SnS with S vacancies 2 Preparation of nanosheets and their application in photodegradation of Cr(VI). Background technique [0002] Heavy metals have been used by humans for thousands of years, and more and more people are being exposed to heavy metals, even in increasing amounts in some countries, but this has led to some adverse health problems. Among the toxic heavy metal ions, hexavalent chromium (Cr(VI)) is a common pollutant in surface water and groundwater, and is widely used in tanning, electroplating, printing, pigment, polishing and other industries. Cr(Ⅵ) is acutely toxic to most organisms, highly carcinogenic, and highly soluble in water, which can increase the risk of diarrhea, liver cancer, kidney cancer, and skin cancer. Unlike common heavy metals such as lead, cadmium, and copper, chromium mainly exists in Cr(III) and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04B01J37/08B01J37/10B82Y30/00B82Y40/00C02F1/30C02F101/22
CPCB01J27/04B01J35/004B01J37/10B82Y30/00B82Y40/00C02F1/30C02F2101/22C02F2305/10
Inventor 王书珍
Owner 江苏悟晴电子新材料有限公司
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