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Few-layer MoS2 uniform modified multi-stage structure TiO2 photocatalyst and preparation method thereof

A photocatalyst and uniform technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low photocatalytic activity, low photogenerated electron transmission rate, etc., and achieve the effect of high activity

Active Publication Date: 2014-12-17
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its strong absorption in a rather broad solar spectrum, it has a wide range of research applications in photoelectricity and photocatalysis, however, MoS 2 It can only be used as a carrier to support semiconductor photocatalysts in the form of multiple layers. This kind of heterogeneous doping is due to the 2 There are still a large number of interfaces with the photocatalytic semiconductor, so the transport rate of photogenerated electrons is still low, resulting in lower photocatalytic activity

Method used

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  • Few-layer MoS2 uniform modified multi-stage structure TiO2 photocatalyst and preparation method thereof
  • Few-layer MoS2 uniform modified multi-stage structure TiO2 photocatalyst and preparation method thereof
  • Few-layer MoS2 uniform modified multi-stage structure TiO2 photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The first step is to prepare hexagonal thick layer MoS 2 : Take 0.25g of ammonium molybdate and dissolve it in water, adjust the pH value to 5, then weigh 2g of thiourea as the sulfur source, after the thiourea is dissolved, transfer the mixed solution to a 250mL hydrothermal kettle, and heat it at 240°C After the reaction was completed, the product was centrifuged, washed, and dried to obtain a hexagonal thick-layer MoS 2 .

[0032] The second step is to prepare few-layer MoS 2 Aqueous solution: Take 0.5g of MoS synthesized above 2 Place in 10mL of 1.6M n-butyllithium solution, under N 2 Stir in a three-necked flask under protection for 48 hours, then filter the solution with 100mL of n-hexane in a simple glove box, transfer the black solid on the filter paper to a sealed container, and then inject 200mL of high-purity water, ultrasonic 1 hour, centrifuge, take the upper layer solution, and repeat the centrifugation until the solution has no precipitation, and a fe...

Embodiment 2

[0042] The first step is different from Example 1 in that the ammonium molybdate consumption is 0.3g, and thiourea is 2.5g.

[0043] In the second step, the difference from Example 1 is that MoS 2 The dosage is 0.2g, the n-butyllithium solution is 5mL, and the high-purity water is 300mL.

[0044] The third step is different from Example 1 in that the few-layer MoS 2 The amount of the solution is 10 mL, the amount of glucose is 7.5 g, the amount of ammonium fluotitanate is 1.5 g and dissolved in 50 mL of water.

Embodiment 3

[0046] The first step is different from Example 1 in that the ammonium molybdate consumption is 0.3g, and thiourea is 2.5g.

[0047] In the second step, the difference from Example 1 is that MoS 2 The dosage is 0.2g, the n-butyllithium solution is 5mL, and the high-purity water is 300mL.

[0048] The third step is different from Example 1 in that the few-layer MoS 2 The dosage of the solution is 10mL, the dosage of glucose is 7.5g, the dosage of ammonium fluotitanate is 1.5g and dissolved in 50mL of water, the pH of the mixed solution is adjusted to 5, the dosage of sulfur powder is 2g, and the curing time is 60min.

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Abstract

The invention discloses a few-layer MoS2 uniform modified multi-stage structure TiO2 photocatalyst and a preparation method thereof. The preparation method comprises the steps of 1. synthesizing a hexagonal phase thick layer MoS2; 2. preparing a stable few-layer MoS2 solution by a lithium insertion method; and 3. directly mixing the obtained stable MoS2 solution with an aqueous solution containing a certain amount of ammonium fluorotitanate and glucose, adjusting the pH value of the mixture, and performing heating, roasting and sulfuration to obtain the prepared catalyst. Compared with the prior art, the few-layer MoS2 uniform modified multi-stage structure TiO2 photocatalyst has the advantages and outstanding effects of the used chemical reagents are commonly used reagents, low in cost and readily available; the test shows that the hydrogen preparation activity of photocatalysis decomposed water is quite high; under 365nm ultraviolet irradiation, the hydrogen yield can reach 2.5mmol h<-1>g<-1>.

Description

technical field [0001] The invention relates to the field of catalyst synthesis, specifically a few-layer MoS 2 Uniform modification of hierarchical TiO 2 Photocatalyst and its preparation method. Background technique [0002] MoS 2 It is a typical transition metal chalcogenide. It consists of covalently bonded S-Mo-S layers with weak van der Waals forces between each layer. MoS 2 It is an indirect bandgap semiconductor with a band gap of 1eV, which can be exfoliated into a single layer. Due to its strong absorption in a rather broad solar spectrum, it has a wide range of research applications in photoelectricity and photocatalysis, however, MoS 2 It can only be used as a carrier to support semiconductor photocatalysts in the form of multiple layers. This kind of heterogeneous doping is due to the 2 There are still a large number of interfaces with photocatalytic semiconductors, so the transport rate of photogenerated electrons is still low, resulting in low photocata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051
Inventor 李贵生李鑫王文超崔莹莹李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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