Full two-dimensional ternary compound g-C3N4/MoS2/SnS2 visible light response photo-catalyst and preparation method

A ternary compound and photocatalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. and other issues to achieve the effect of promoting separation, good development prospects, and increasing absorption

Pending Publication Date: 2019-12-20
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific performance is that g-C3N4 has strong oxidation ability, but its specific surface area is small and the electron-hole recombination rate is high; MoS 2 It has a suitable band gap, large specific surface and high reactivity, but its photocatalytic activity is low, and only the exposed edge has photocatalytic activity; SnS 2 It is a visible light semiconductor photocatalyst with good photocatalytic performance, but it has strong volatility and photocorrosion at high temperature, which seriously affects the performance of SnS. 2 Practical Applications of Photocatalysis

Method used

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  • Full two-dimensional ternary compound g-C3N4/MoS2/SnS2 visible light response photo-catalyst and preparation method
  • Full two-dimensional ternary compound g-C3N4/MoS2/SnS2 visible light response photo-catalyst and preparation method
  • Full two-dimensional ternary compound g-C3N4/MoS2/SnS2 visible light response photo-catalyst and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The synthesis process of the present embodiment is as follows:

[0028] (1)MoS 2 nanosheet synthesis

[0029] 1.5mmol sodium molybdate hydrate (Na 2 MoO 4 .2H 2 O), 10mmol thioacetamide (C 2 h 5 NS), 1.5mmol hydrated silicotungstic acid (H 4 [SiO 4 (W 3 o 10 ) 4 ].xH 2 O) Samples were dissolved in 80 mL of deionized water and magnetically stirred for 2 hours. Transfer the completely dissolved solution to a reaction kettle and heat it to 230°C for 24 hours and then cool it down to room temperature naturally. The reaction product is centrifugally dispersed and washed several times with deionized water and ethanol to obtain a black precursor, which is dried at 70°C to obtain MoS 2 Nanosheets.

[0030] (2)MoS 2 / SnS 2 Composite nanosheet synthesis

[0031] The prepared MoS 2 Dissolve in 90mL deionized water, then add 1mmol tin chloride hydrate (SnCl 4 .5H 2 O) and 5mmol citric acid (C 6 h 8 o 7 ), placed for 1 hour, then added 7.89mmol thiourea and ma...

Embodiment 2

[0037] In the preparation process of this example, the MoS 2 / SnS 2 Composite nanosheets and sheet-like g-C 3 N 4 The product compounded according to the mass ratio of 2:8 is marked as Compound20, and the other embodiments are the same as in Example 1.

Embodiment 3

[0039] In the preparation process of this example, the MoS 2 / SnS 2 Composite nanosheets and sheet-like g-C 3 N 4 The product compounded according to the mass ratio of 3:7 is marked as Compound30, and other embodiments are the same as in Example 1.

[0040] The most important basis for the improvement of the visible light photocatalytic performance of the above three materials through composite modification is based on the matching relationship between the band gaps of the three materials. The electrode potential values ​​of the valence band and the conduction band of the three materials are obtained through the band gap values ​​extracted from the UPS spectrum and absorption spectrum of XPS, as figure 1 shown. It can be seen that g-C 3 N 4 、MoS 2 and SnS 2 The potential values ​​of the conduction band and valence band of the three materials rise sequentially to form an interlaced energy level structure, which makes the photogenerated electrons and holes flow to the Sn...

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Abstract

The invention discloses a full two-dimensional ternary compound g-C3N4 / MoS2 / SnS2 visible light response photo-catalyst and a preparation method. The preparation method comprises the following steps: dissolving sodium molybdate hydrate, thioacetamide and silicotungstic acid hydrate in deionized water to obtain a MoS2 nano-sheet; dissolving MoS2 in deionized water, and adding tin chloride hydrate and citric acid to obtain a MoS2 / SnS2 composite nano-sheet; heating urea and dissolving a powder and performing ultrasonic treatment, and performing peeling-off on the block to obtain a flaky g-C3N4; and compounding the MoS2 / SnS2 composite nano-sheet with the flaky g-C3N4 to obtain a nano-sheet of a ternary compound g-C3N4 / MoS2 / SnS2. The three units in the compound prepared by the method are in surface-surface contact and effectively compounded, and a staggered energy level structure is shown, so that absorption of visible light is increased, separation of electron-hole pairs is promoted, photo-catalytic efficiency is improved, and thereby the compound is expected to be widely used in the field of photo-catalytic degradation of organic matters, and has relatively good development prospects.

Description

technical field [0001] The present invention relates to a catalyst responsive to visible light, in particular to a comprehensive two-dimensional ternary compound g-C 3 N 4 / MoS 2 / SnS 2 Visible light responsive photocatalyst and preparation method. Background technique [0002] The current fossil fuels still play an important role in life and industry, and the annual consumption is still showing a rising trend, and the resulting organic pollutants seriously damage the environment and threaten human health. Direct use of solar energy for photocatalytic degradation of pollutants is the first choice to deal with environmental pollution. In this regard, wide-bandgap oxide semiconductor materials such as TiO2, SnO2, etc., which have been studied more and have higher activity, the spectral range of photocatalytic reaction is limited by ultraviolet light, and the radiation energy of ultraviolet light only accounts for 4% of sunlight. , which is an important factor limiting its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J27/051B01J27/24
CPCB01J27/24B01J35/004B01J27/051B01J27/04
Inventor 陈昌兆王千倪晓
Owner ANHUI UNIV OF SCI & TECH
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