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a kind of sns 2 /1t-mos 2 qds composite photocatalyst, preparation method and application

A technology of catalyst and recombination of light, which is applied in the field of photocatalytic materials, can solve the problems of high recombination rate of photogenerated carriers, low utilization rate of visible light, and limitation of practical application, so as to improve light absorption capacity, reduce recombination rate, and high catalytic activity Effect

Active Publication Date: 2022-05-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among many semiconductor materials, tin disulfide has been widely concerned by researchers because of its low cost, non-toxicity, wide spectral response, etc., but SnS 2 As a photocatalyst, there are still some shortcomings, such as high recombination rate of photogenerated carriers and low utilization rate of visible light, resulting in low photocatalytic activity, which greatly limits its practical application in the field of photocatalysis.

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  • a kind of sns <sub>2</sub> /1t-mos <sub>2</sub> qds composite photocatalyst, preparation method and application
  • a kind of sns <sub>2</sub> /1t-mos <sub>2</sub> qds composite photocatalyst, preparation method and application
  • a kind of sns <sub>2</sub> /1t-mos <sub>2</sub> qds composite photocatalyst, preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of SnS 2 / 1T-MoS 2 QDS composite photocatalysts including SnS containing S-vacancy defects 2 Nanosheets and loaded on SnS 2 1T-MoS on nanosheets 2 QDS, 1T-MoS 2 QDS and SnS 2 Nanosheets form heterojunctions, and 1T-MoS 2 The weight ratio of QDS in the composite photocatalyst is 1%.

[0038] The specific preparation method is as follows:

[0039] Step 1, weigh 5mmol SnCl 4 ·5H 2O and 5mmol of citric acid were dissolved in 40mL of ultrapure water, and magnetically stirred for 30min; then 5mmol of L-cysteine ​​was added, and the stirring was continued for 1h. In an ethylene-lined autoclave, place it in an oven at 150°C for hydrothermal reaction for 12 hours. After the reaction, a yellow solid precipitates, which is washed by centrifugation and dried at 60°C for 12 hours to obtain SnS 2 Nanosheets;

[0040] Step 2, 1mmol Na 2 MoO 4 2H 2 O was sonicated in 30mL ultrapure water for 30min to obtain Na 2 MoO 4 2H 2 O aqueous solution;

[0041] Sonicate ...

Embodiment 2

[0048] A kind of SnS 2 / 1T-MoS 2 QDS composite photocatalysts including SnS containing S-vacancy defects 2 Nanosheets and loaded on SnS 2 1T-MoS on nanosheets 2 QDS, 1T-MoS 2 QDS and SnS 2 Nanosheets form heterojunctions, and 1T-MoS 2 The weight ratio of QDS in the composite photocatalyst is 3%.

[0049] The specific preparation method is as follows:

[0050] Step 1, weigh 5mmol SnCl 4 ·5H 2 O and 5 mmol citric acid, dissolved in 40 mL ultrapure water, stirred magnetically for 30 min, then added 8.75 mmol thioacetamide, continued stirring for 4 h, then, transferred to a 100 mL autoclave lined with Teflon placed in an oven at 150°C for hydrothermal reaction for 12 hours, and a yellow solid precipitate was obtained after the reaction, which was washed by centrifugation and dried at 60°C for 12 hours to obtain SnS 2 Nanosheets;

[0051] Step 2, 1mmol Na 2 MoO 4 2H 2 O was sonicated in 30mL ultrapure water for 30min to obtain Na 2 MoO 4 2H 2 O aqueous solution;

...

Embodiment 3

[0058] A kind of SnS 2 / 1T-MoS 2 QDS composite photocatalysts including SnS containing S-vacancy defects 2 Nanosheets and loaded on SnS 2 1T-MoS on nanosheets 2 QDS, 1T-MoS 2 QDS and SnS 2 Nanosheets form heterojunctions, and 1T-MoS 2 The weight ratio of QDS in the composite photocatalyst is 3%.

[0059] The specific preparation method is as follows:

[0060] Step 1, weigh 5mmol SnCl 4 ·5H 2 0 and 5mmol citric acid, dissolved in 40mL ultrapure water, stirred magnetically for 30min, then added 10mmol sodium sulfide, continued to stir for 5h, then transferred it to a 100mL autoclave lined with polytetrafluoroethylene, placed Put it in an oven at 180°C for hydrothermal reaction for 12 hours. After the reaction, a yellow solid precipitate was obtained, which was washed by centrifugation and dried at 60°C for 12 hours to obtain SnS 2 Nanosheets;

[0061] Step 2, ultrasonicating 1mmol ammonium molybdate in 30mL ultrapure water for 30min to obtain ammonium molybdate aqueou...

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Abstract

The invention discloses a SnS 2 / 1T‑MoS 2 QDS composite photocatalysts including SnS containing S-vacancy defects 2 Nanosheets and loaded on SnS 2 1T‑MoS on nanosheets 2 QDS, 1T‑MoS 2 QDS and SnS 2 Nanosheets form heterojunctions, and 1T‑MoS 2 The weight ratio of QDS in the composite photocatalyst is 1‑3%. The catalyst of the present invention effectively controls the number of generated S vacancies, and the generated S vacancies can effectively regulate the SnS 2 The band structure of 1T‑MoS 2 QDS and SnS 2 The nanosheets form a heterojunction, and the interface between the two is consolidated through a hydrothermal reaction. The catalyst of the invention can promote the separation of photogenerated electron-hole pairs, reduce the recombination rate of photogenerated electron-hole pairs, exhibit higher catalytic activity, and have broad application prospects.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a SnS 2 / 1T-MoS 2 QDS composite photocatalyst, preparation method and application. Background technique [0002] Hexavalent chromium is a common pollutant in wastewater from industrial processes such as leather tanning, electroplating and chromate production. Due to its high toxicity, strong fluidity and carcinogenicity, it poses a serious threat to human health and water resources. Therefore, the effective removal of hexavalent chromium in water is the top priority in wastewater treatment. [0003] As a highly efficient, environmentally friendly and promising water treatment technology, semiconductor photocatalysis has attracted more and more attention. Among many semiconductor materials, tin disulfide has been widely concerned by researchers because of its low cost, non-toxicity, wide spectral response, etc., but SnS 2 As a photocatalyst, there are still s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051B01J37/10B01J37/34C02F1/30C02F101/22
CPCB01J27/051B01J37/10B01J37/343B01J35/004C02F1/30C02F2305/10C02F2101/22
Inventor 强涛涛夏亚娟
Owner SHAANXI UNIV OF SCI & TECH
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