Preparation method for visible light photocatalyst prepared by CdS quantum dot sensitization Zn1-xCdxs and photodecomposition of water into hydrogen

A zn1-xcdxsx, quantum dot sensitization technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low activity of visible light photocatalytic hydrogen production

Inactive Publication Date: 2011-01-12
WUHAN UNIV OF TECH
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  • Summary
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  • Application Information

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Problems solved by technology

However, bulk CdS cannot sensitize ZnS due to its special valence band/conduction band position, so the vi...

Method used

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  • Preparation method for visible light photocatalyst prepared by CdS quantum dot sensitization Zn1-xCdxs and photodecomposition of water into hydrogen
  • Preparation method for visible light photocatalyst prepared by CdS quantum dot sensitization Zn1-xCdxs and photodecomposition of water into hydrogen
  • Preparation method for visible light photocatalyst prepared by CdS quantum dot sensitization Zn1-xCdxs and photodecomposition of water into hydrogen

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Experimental program
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Embodiment 1

[0033] Preparation of CdS quantum dots sensitized Zn 1-x Cd x Sx≤0.02 solid solution photocatalyst

[0034] Firstly, ZnS nanoparticles were prepared, and then CdS quantum dots were deposited on Zn by cation exchange hydrothermal method. 1-x Cd x Sx≤0.02 solid solution surface, the detailed experimental process is as follows: first, zinc nitrate is used as zinc source, thiourea is used as sulfur source, and ZnS nanoparticle precursor is prepared by hydrothermal method. Dissolve 4 mmol of zinc nitrate hexahydrate and 60 mmol of thiourea in 80 ml of deionized water with stirring. After stirring at room temperature for 30 minutes, the mixed solution was transferred to a 100 ml polytetrafluoroethylene reactor. After sealing, the reactor was heated to 140° C. and kept at this temperature for 12 hours. After the reactor was cooled to room temperature, the white product was collected and washed with deionized water and ethanol in sequence, and then the powder was dried in a drying...

Embodiment 2

[0043] In order to prove that the CdS quantum dot pair improves the Zn 1-x Cd x Effect of Sx≤0.02 solid solution photocatalyst on visible light photocatalytic water splitting hydrogen production activity, comparing CdS nanoparticles sensitized Zn with different grain sizes 1-x Cd x The activity of Sx≤0.02 solid solution photocatalyst (see Table 1). The results showed that Zn alone 1-x Cd x S x ≤ 0.02 solid solution has weak activity, when in Zn 1-x Cd x After a certain amount of CdS is loaded on the surface of the solid solution with Sx≤0.02, the visible light activity of the product is obviously enhanced. But as the size of CdS particles gradually increased, the activity of the samples gradually decreased. This is because only under the influence of the quantum size effect, the position of the valence band and the conduction band of the CdS quantum dots can facilitate the transfer of photogenerated electrons, thereby improving the photocatalytic activity of the product...

Embodiment 3

[0045] In order to test the effect of hydrothermal time on the photocatalytic activity of the sample, in the cation exchange hydrothermal process, the hydrothermal temperature was fixed at 140°C. Except for the different hydrothermal time, other reaction conditions such as: the amount of ZnS precursor, the volume of cadmium nitrate solution And reaction system etc. are all identical with embodiment 1. The results show that the samples prepared in 0-1 hours have poor crystallization due to the short hydrothermal time, and the hydrogen production activity of visible light photocatalytic decomposition of water is very low. With the prolongation of hydrothermal time, the photocatalytic activity of the samples gradually increased. When the hydrothermal time was increased to 8 hours, the photocatalytic activity of the sample increased significantly, usually the higher the crystallinity, that is to say the fewer surface and bulk defects, resulting in a decrease in the recombination p...

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Abstract

The invention relates to a preparation method for a CdS quantum dot sensitization Zn1-xCdxs sosoloid photochemical catalyst (x is less than or equal to 0.02) having the visible light photocatalytic decomposition aquatic hydrogen activity. In a cation exchange hydrothermal method, ZnS nanoparticles and a cadmium nitrate solution are used as a precursor, and the preparation is carried out by controlling the proportioning of reactants, the reaction temperature, the reaction time, and the like. The preparation method comprises the following steps of: ultrasonically dispersing the ZnS nanoparticle precursor in deionized water; adding the cadmium nitrate solution until the atomicpercent of cadmium to zinc in the system is larger than 0 to 80%; stirring for 30 minutes at room temperature and then removing into a hydrothermal kettle of 100ml; carrying out a hydrothermal reaction for 5 to 24 hours at the temperature of 100 to 200 DEG C; successively washing the collected solid sediments with water and ethanol; and drying for 10 hours at the temperature of 60 DEG C to prepare the CdS quantum dot sensitization Zn1-xCdxs sosoloid visual light photocatalyst (x is less than or equal to 0.02). The invention can ensure that the CdS quantum dot sensitization Zn1-xCdxs sosoloid visual light photocatalyst (x is less than or equal to 0.02) has the advantages of high hydrogen generation rate and no noble metal load requirement; and the method has the advantages of simple operation, no high temperature processing requirement, friendly environment and low cost.

Description

technical field [0001] The invention relates to CdS quantum dot sensitized Zn for visible light photolysis of water to produce hydrogen 1-x Cd x The preparation method of the Sx≤0.02 photocatalyst is specifically a method of using ZnS nano particles and cadmium nitrate solution as precursors through cation exchange hydrothermal method. technical background [0002] Since the discovery by Fujishima and Honda in 1972 of titanium dioxide photocatalytic water splitting to produce hydrogen, titanium dioxide and other semiconductor photocatalytic materials have attracted close attention due to their wide potential applications in the fields of water and air purification and solar energy conversion. Among them, through the photocatalytic process, solar energy is used to excite photocatalytic materials to generate electrons and holes, and the reduction ability of electrons and the oxidation ability of holes are used to decompose water to produce hydrogen and oxygen, which provides ...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J37/30B01J37/10C01B3/04
CPCY02E60/364Y02E60/36
Inventor 余家国张军程蓓
Owner WUHAN UNIV OF TECH
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