Preparation of Cu:Ag-In-Zn-S quantum dot photocatalyst by hydrothermal doping method and application thereof

Abstract

The invention belongs to the technical field of nano material synthesis, and relates to the preparation of a Cu:Ag-In-Zn-S quantum dot photocatalyst by a hydrothermal doping method. The preparation ofthe Cu:Ag-In-Zn-S quantum dot photocatalyst by the hydrothermal doping method comprise the steps that a silver source, an indium source and a zinc source are dissolved in deionized water, L-cysteineis added into the mixture, the mixture is evenly stirred to obtain a settled solution, and the pH value is adjusted to 6-10 to obtain a solution A; a sulfur source is added into the mixture, the mixture is ultrasonically stirred uniformly, hydrothermal reaction is carried out at 110-240 DEG C for 4-8 hours, and a Zn-AgIn5S8 quantum dot stock solution is obtained after centrifugal washing; and a standard copper acetate solution is added into the solution A, a sulfur source is added into the mixture, the mixture is ultrasonically stirred uniformly, and hydrothermal reaction is carried out at 110-220 DEG C for 4-8 hours to obtain Cu: Ag-In-Zn-S quantum dot photocatalyst, or the standard copper acetate solution is doped into Zn-AgIn5S8 quantum dot stock solution for uniform stirring, and the mixture is evenly stirred, centrifuged, washed and dried to obtain the photocatalyst. The invention further discloses the application of the prepared photocatalyst to photocatalytic hydrogen production. A simple process, low price and easy availability, short reaction time, reduction of energy consumption and reaction cost by converting solar light energy into clean energy and excellent photocatalytic activity are achieved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis and relates to quantum dot photocatalysts, in particular to the preparation of Cu:Ag-In-Zn-S quantum dot photocatalysts by a hydrothermal doping method and applications thereof. Background technique [0002] Polynary sulfides, such as group I-III-VI compound semiconductors, can tolerate high non-stoichiometric ratios and possess abundant trap states, leading to deep donor / acceptor pair recombination characteristic of carriers in group I-III-VI semiconductors mechanism and endow it with unique optical properties. Therefore, in the field of photocatalytic hydrogen production, this has widely aroused the interest of researchers. At present, a lot of research is mainly to adjust the bandgap and improve the I-III- Photocatalytic activity of VI quantum dots. [0003] Professor Kudo's group reported a series of pioneering (AgIn) x Zn 2(1-x) S 2 , (CuIn) (x) Zn 2(1-x) S 2 Solid solu...

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Problems solved by technology

However, in the existing work, there are few researches on the function-oriented preparation and regulation strategies for the hydrogen production performance of photocatalysts, and little consideration is given to the energy level position, photogenerated carrier separation and migration, and avoidance of radiative recombination in photocatalytic applications. Therefore, combined with the developed monodisperse quantum dot preparation strategy, we will deeply explore the composition and structure regulation of complex component Cu:Ag-In-Zn-S quantum dots, including size, shape, exposed crystal plane, surface properties, etc., And improving the separation efficiency of photogenerated electrons and holes by compounding with a suitable cocatalyst is the key to improving the hydrogen production performance of visible light, and the reported monodisperse quantum dot photocatalysts are still limited to quaternary and below sulfide systems. The reports and research depth of multi-component Cu:Ag-In-Zn-S quantum dots with good performance but more complex components are far from enough, and there is a lack of in-depth systematic research on the components, sizes, and surface structures of the system

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