Modified CdS/ZnS quantum dots prepared by using sol-gel method and application of modified CdS/ZnS quantum dots in photocatalytic hydrogen evolution

Abstract

The invention relates to modified CdS / ZnS quantum dots prepared by using a sol-gel method and application of the modified CdS / ZnS quantum dots in photocatalytic hydrogen evolution, in particular to CdS / ZnS quantum dots prepared by using hydrogel as special gel and application of the CdS / ZnS quantum dots in photocatalytic hydrogen evolution. The method comprises the steps: dispersing HR into a Cd<2+> / Zn<2+> aqueous solution, performing gentle stirring for a period of time at a certain temperature so as to obtain HR / Cd<2+> and HR / Zn<2+>, adding the HR / Cd<2+> and HR / Zn<2+> to a certain amount ofNa2S aqueous solution separately, performing gentle stirring for a period of time, and performing washing and drying so as to obtain HR / CdS and HR / ZnS. The method is simple, has low preparation cost and no environmental pollution, and a novel micro hydrogen production reactor can be produced through effective bonding of the prepared CdS / ZnS quantum dots with hydrogel; the reactor has good activityof photocatalytic hydrogen evolution, and the hydrogel has low cost; and the method can be applied to adsorption of Cd<2+> / Zn<2+> ions in waste liquids, and subsequent vulcanization is performed, sothat removal and reuse of the metal ions in the waste liquids are achieved.

Description

technical field [0001] The invention belongs to the technical field of the preparation of CdS / ZnS quantum dots and the application of photocatalytic hydrogen evolution, and specifically relates to a method capable of preparing CdS / ZnS quantum dots and its photocatalytic hydrogen evolution through the special function of hydrogel as a gel application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In recent years, sulfides such as CdS and ZnS have been widely used in the photocatalytic hydrogen evolution reaction. A variety of morphological structures have been prepared, such as solid solutions, nanosheets, nanowires, quantum dots, and so on. Among these structures, qua...

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Problems solved by technology

However, the inventors found that the composite materials prepared by this type of method have the problem that the quantum dots are easy to fall off and agglomerate in the process of catalyzing hydrogen evolution.

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