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A phosphorus-doped zinc cadmium sulfide solid solution catalyst, photocatalytic system and method for splitting water to produce hydrogen

A technology of zinc cadmium sulfide and solid solution, which is applied in the field of photocatalysis, can solve the problems of secondary pollution of the natural environment, waste of resources, etc., and achieve the effects of improving light absorption performance, mild reaction conditions, and simple operation

Active Publication Date: 2020-09-18
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of the sacrificial agent itself is a waste of resources, and if the decomposition is not complete, it will cause secondary pollution to the natural environment

Method used

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  • A phosphorus-doped zinc cadmium sulfide solid solution catalyst, photocatalytic system and method for splitting water to produce hydrogen
  • A phosphorus-doped zinc cadmium sulfide solid solution catalyst, photocatalytic system and method for splitting water to produce hydrogen
  • A phosphorus-doped zinc cadmium sulfide solid solution catalyst, photocatalytic system and method for splitting water to produce hydrogen

Examples

Experimental program
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Effect test

Embodiment 1

[0055] A kind of phosphorus-doped zinc cadmium sulfide solid solution catalyst, its chemical formula is P-CdS, and preparation method comprises the steps:

[0056] 1) Dissolve 2 mmol of cadmium acetate dihydrate in 75 mL of deionized water. Then take 2mmol thiourea and dissolve in the above solution. After electromagnetic stirring at room temperature for 1 h, 5 mL of hydrazine hydrate was added dropwise to the above mixed solution. Then all the reaction solution was transferred to a polytetrafluoroethylene reactor with a volume of 100mL, and hydrothermally reacted at 180°C for 24h. After the reaction was completed, it was naturally cooled to room temperature. Finally, after several times of centrifugation, washing with deionized water, and drying at 60° C. for 12 hours, the CdS catalyst was obtained.

[0057] 2) Take 100 mg of CdS prepared in step 1) and 500 mg of NaH 2 PO 2 Grind in an agate mortar to mix well. Then the above solid was placed in a porcelain boat and heat...

Embodiment 2

[0061] A kind of phosphorus-doped zinc cadmium sulfide solid solution catalyst, its chemical formula is P-Zn 0.5 Cd 0.5 S, the preparation method comprises the steps:

[0062] 1) Dissolve 1 mmol of cadmium acetate dihydrate and 1 mmol of zinc acetate dihydrate in 75 mL of deionized water at the same time, and disperse evenly by ultrasonication. Then take 2 mmol thiourea in the above mixed solution, and disperse evenly by ultrasonic. After electromagnetic stirring at room temperature for 1 h, 5 mL of hydrazine hydrate was added dropwise to the above mixed solution. Then all the reaction solution was transferred to a polytetrafluoroethylene reactor, and hydrothermally reacted at 180° C. for 24 hours, and naturally cooled to room temperature after the reaction was completed. Finally, the Zn 0.5 Cd 0.5 S solid solution.

[0063] 2) Take 100mg of Zn prepared in step 1) 0.5 Cd 0.5 S solid solution with 500mg NaH 2 PO 2 Grind in an agate mortar to mix well. Then put the ab...

Embodiment 12

[0077] Photocatalytic system, including phosphorus-doped zinc cadmium sulfide solid solution catalyst and water, wherein the phosphorus-doped zinc cadmium sulfide solid solution catalyst adopts the P-Zn prepared in Example 1~Example 11 respectively x Cd 1-x S (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0).

[0078] The above 11 kinds of photocatalytic systems are used for photocatalytic water splitting, including the following steps:

[0079]Add 1 mg phosphorus-doped zinc cadmium sulfide solid solution catalyst and 5 mL water into a quartz tube with a total volume of 15 mL, pass argon gas for 30 min to remove oxygen, and seal it with a rubber stopper. The sample tube was kept stirring continuously with a magnetic stirrer at room temperature, and the light source for illumination was an LED lamp (λ≥420nm). The amount of hydrogen gas produced after 2 hours of illumination was detected by gas chromatography (GC-14C, Shimadzu). The type of molecular sieve column is ...

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Abstract

The invention discloses a phosphorus-doped cadmium zinc sulfide solid solution catalyst. The phosphorus-doped cadmium zinc sulfide solid solution catalyst adopts a chemical formula of P-ZnxCd1-xS, wherein x is greater than or equal to 0 and smaller than or equal to 1. The invention further discloses a preparation method of the phosphorus-doped cadmium zinc sulfide solid solution catalyst. The preparation method comprises the following steps: uniformly mixing a cadmium zinc sulfide solid solution and a phosphorus source, and performing a phosphorization reaction to obtain the phosphorus-doped cadmium zinc sulfide solid solution catalyst. By the preparation method, raw materials have few types and are cheap and easy to obtain, a reaction condition is mild, and operation is easy. The invention further discloses a comprises a photocatalytic system comprising the phosphorus-doped cadmium zinc sulfide solid solution catalyst. Any cocatalyst and any electronic sacrificial agent are required to be added in the photocatalytic system, a reaction system is simple, and the water decomposition is catalyzed under a pure water condition, so that practical application is more facilitated.

Description

technical field [0001] The invention relates to the technical field of photocatalysis. More specifically, it relates to a phosphorus-doped zinc-cadmium sulfide solid solution catalyst, a photocatalytic system and a method for splitting water to produce hydrogen. Background technique [0002] In recent years, semiconductor photocatalysis technology has attracted much attention because of its broad application prospects in solving environmental pollution problems and alleviating energy crises. Among them, the narrow-bandgap semiconductor cadmium sulfide (CdS), which can respond to visible light and has a suitable energy band position, has attracted extensive research. However, the low separation efficiency of photogenerated electron-hole pairs of cadmium sulfide and severe photocorrosion phenomenon limit its practical application. In order to improve the photocatalytic activity and stability of cadmium sulfide, it can be combined with zinc sulfide with similar lattice struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/14B01J35/02C01B3/04
CPCB01J27/14B01J35/004B01J35/023C01B3/042C01B2203/0277C01B2203/1041Y02E60/36
Inventor 陈勇野惠芳石睿
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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