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A photocatalytic material cu 2-x s/mn 0.5 cd 0.5 s/mos 2 Its preparation method and application

A photocatalytic material, cu2-xs technology, applied in catalyst activation/preparation, chemical instruments and methods, chemical/physical processes, etc. solutions, etc., to achieve high commercial application prospects, good photocatalytic performance, and excellent hydrogen production activity.

Active Publication Date: 2020-06-02
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following technical problems in catalytic photolysis of water to produce hydrogen: 1. Low utilization rate of sunlight; 2. Low photon quantum yield (about 4%); 3. Energy level mismatch; 4. Reverse reaction carrier recombination
These technical difficulties lead to low efficiency of catalytic photolysis of water to produce hydrogen
Although the existing CdS-based semiconductor catalysts have an energy gap that matches the solar spectrum, there are problems such as photocorrosion and low efficiency of catalytic photolysis of water to produce hydrogen.
Cd prepared by doping modification of CdS x mn 1-x Although the S solid solution photocatalyst has improved the efficiency of catalytic photolysis of water to produce hydrogen, it still has the problem of low hydrogen production efficiency.
[0004] In summary, there is still a lack of effective solutions to the problem of low hydrogen production efficiency by catalytic photolysis of water in the prior art

Method used

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  • A photocatalytic material cu <sub>2-x</sub> s/mn <sub>0.5</sub> cd <sub>0.5</sub> s/mos <sub>2</sub> Its preparation method and application
  • A photocatalytic material cu <sub>2-x</sub> s/mn <sub>0.5</sub> cd <sub>0.5</sub> s/mos <sub>2</sub> Its preparation method and application
  • A photocatalytic material cu <sub>2-x</sub> s/mn <sub>0.5</sub> cd <sub>0.5</sub> s/mos <sub>2</sub> Its preparation method and application

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preparation example Construction

[0037] In one embodiment of the present application, there is provided a Cu 2-x S / Mn 0.5 Cd 0.5 S / MoS 2 The preparation method of composite photocatalytic material, the steps are as follows:

[0038] First prepare the synthetic Mn 0.5 Cd 0.5 The substrate material of S solid solution, and then cleverly use different solubility, in situ loading to get Cu 2-x S-modified Mn 0.5 Cd 0.5 S solid solution, which builds a local P-N junction at the nanoscale. The construction of P-N junction can effectively promote the separation of carriers, and the photogenerated holes flow to Cu 2-x S, photogenerated electrons flow to the base material Mn 0.5 Cd 0.5 S solid solution. The electrons and holes have been effectively separated, and then photoreduction (NH 4 ) 2 MoS 4 A method for directed loading of MoS 2 in Mn 0.5 Cd 0.5 S solid solution on the substrate, thus realizing the space-separated double-cocatalyst-modified Mn 0.5 Cd 0.5 S, as active sites for oxidation and r...

Embodiment 1

[0046] Example 1: Cu 2-x S / Mn 0.5 Cd 0.5 S / MoS 2 Preparation of composite photocatalytic materials

[0047] Specific steps are as follows:

[0048] (1) Preparation of Mn by hydrothermal method 0.5 Cd 0.5 S solid solution:

[0049] 1mmol of Mn(CH 3 COO) 2 4H 2 O and 1 mmol of Cd(CH 3 COO) 2 2H 2 O was dissolved in 35 mL of deionized water and marked as A. 6mmol of L-cystine was dissolved in 35mL of water outside the forest, and the pH value was adjusted to 10.5 with 6mol / L NaOH to dissolve it, marked as B. Slowly add solution A to solution B, continue to stir for 30 minutes, transfer it to a stainless steel reaction kettle, and heat it at 130 degrees for 10 hours.

[0050] (2) Preparation of Cu by in situ ion exchange 2-x S / Mn 0.5 Cd 0.5 S:

[0051] The synthesized Mn 0.5 Cd 0.5 S was ultrasonically dispersed in 100mL of water, and a certain amount of Cu(NO 3 ) 2 The solution was added dropwise to it for ion exchange, while adding Na 2 S and Na 2 SO 3 M...

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Abstract

The invention discloses a photocatalytic material Cu2-xS / Mn0.5Cd0.5S / MoS2 as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) preparing asubstrate Mn0.5Cd0.5S solid solution; 2) ultrasonically dispersing the Mn0.5Cd0.5S solid solution prepared by step 1) into water and adding soluble copper salt, Na2S and Na2SO3 into the Mn0.5Cd0.5S solid solution; stirring and reacting to obtain in-situ loaded Cu2-xS / Mn0.5Cd0.5S; 3) adding (NH4)2MoS4 into a reacted solution in step 2) and directionally loading MoS2 by adopting a visible light photo-reduction loading method to generate the Cu2-xS / Mn0.5Cd0.5S / MoS2. A synthesis method for preparing the photocatalytic material Cu2-xS / Mn0.5Cd0.5S / MoS2 disclosed by the invention has simple conditions, no pollution and good stability and has a relatively high commercial application prospect.

Description

technical field [0001] The invention belongs to the technical field of new energy and photocatalytic materials, in particular to a photocatalytic material Cu 2-x S / Mn 0.5 Cd 0.5 S / MoS 2 And the preparation method thereof, the photocatalyst can be used for photocatalytic decomposition of water to produce hydrogen and photocatalytic treatment of sulfide pollutants. Background technique [0002] Due to the continuous improvement of human demand for energy, the excessive use of fossil fuels has brought serious energy crisis and environmental pollution problems, which seriously affect the development of human beings. Hydrogen energy is also known as "the oil of the future". As a clean, non-polluting, renewable, and high-combustion secondary energy source, it can replace non-renewable energy sources such as fossil fuels, and has far-reaching significance for solving energy problems. At present, the main methods of hydrogen production include hydrogen production by cracking fos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051B01J37/10B01J37/16B01J37/30B01J37/34C01B3/04
CPCB01J27/051B01J35/004B01J37/10B01J37/16B01J37/30B01J37/344C01B3/042C01B2203/1076Y02E60/36
Inventor 张晓阳刘小磊王朋王泽岩秦晓燕刘媛媛张倩倩
Owner SHANDONG UNIV
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