7 results about "Cadmium sulfide" patented technology

A ZIF-derived zinc-cadmium sulfide photocatalyst, its preparation method, and its application are disclosed. The catalyst, by molar fraction, comprises: 35-50% 2-methylimidazole; 0-7.7% divalent cadmium ion compound; 0-7.7% divalent zinc ion compound; 7-10% thioacetamide; and 35-50% amines. The preparation method involves: preparing a 2-methylimidazole solution and a cadmium-zinc mixed solution separately; then preparing a ZIF precursor solution with cadmium and zinc as the central metals; adding thioacetamide to the precursor solution; transferring the solution to a polytetrafluoroethylene liner and hydrothermally treating it; finally collecting the hydrothermally treated solution, centrifuging, washing, drying, and grinding to obtain the ZIF-derived zinc-cadmium sulfide photocatalyst. The catalyst prepared by this invention has a large specific surface area and exhibits significant catalytic effects in photocatalytic water splitting for hydrogen production. Furthermore, the catalyst has a stable structure and can be recycled for a long period without a significant decrease in the hydrogen production rate.

The application relates to the cross field of photocatalytic composite materials and soil environment remediation technology, and specifically discloses a three-dimensional graphene aerogel loaded cadmium sulfide quantum dot composite material, a preparation method and application of the composite material in soil cadmium pollution remediation, the composite material is composed of a three-dimensional interconnected porous sulfur-doped graphene aerogel skeleton and in-situ anchored cadmium sulfide quantum dots, the cadmium sulfide quantum dots have a particle size of 2-10 nm, a loading amount of 10 wt%-25 wt%, a surface sulfur vacancy density of 5%-8%, the skeleton has a sulfur atom content of 2 at%-5 at%, and the two are connected through a carbon-sulfur-cadmium covalent bridge; the material has a hierarchical porous structure with longitudinal through macropores of 20-80 mu m and intrawall mesopores of 2-20 nm, the material is prepared by adopting a three-stage programmed hydrothermal method, and a sulfur source is released in stages by 30%-50% excess thioacetamide to drive the formation of an epoxy group nucleophilic ring-opening anchor point, in-situ nucleation of quantum dots and generation of surface sulfur vacancies.

The application belongs to the technical field of photoelectric materials, and particularly relates to a yttrium-doped CdS thin film and a preparation method and application thereof. The preparation method of the yttrium-doped CdS thin film comprises the following steps: adding a cadmium salt solution, ammonia water and a thiourea solution into water in sequence and stirring uniformly to obtain a mixed solution; immersing a conductive substrate on which a P-type chalcogenide compound absorption layer thin film is formed into the mixed solution, and performing initial deposition through water bath heating; taking out the conductive substrate after the initial deposition, immersing it into a yttrium salt solution first, and then depositing it in the mixed solution, repeating the immersing and depositing operations for 4-6 times, and washing and drying to obtain the yttrium-doped CdS thin film. The yttrium-doped CdS thin film prepared by the application is used as a buffer layer for a CZTSSe solar cell, and a photoelectric conversion efficiency of 15.19% is achieved.

The invention belongs to the technical field of photocatalysts, and particularly relates to a twin-crystal zinc cadmium sulfide nanosheet, a composite photocatalyst and a preparation method and application thereof.The preparation method of the twin-crystal zinc cadmium sulfide nanosheet comprises the following steps that a zinc source, a diethylenetriamine aqueous solution and a sulfur source are mixed, a first solvothermal reaction is conducted, and a second solvothermal reaction is conducted; a zinc sulfide-diethylenetriamine composite precursor is obtained; mixing the zinc sulfide-diethylenetriamine composite precursor, a cadmium source and an organic solvent, and performing a second solvothermal reaction to replace part of zinc ions in crystal lattices of the zinc sulfide-diethylenetriamine composite precursor with cadmium ions to obtain a zinc cadmium sulfide-diethylenetriamine composite precursor; and dispersing the zinc cadmium sulfide-diethylenetriamine composite precursor in water, and carrying out hydrothermal reaction to remove diethylenetriamine molecules, thereby obtaining the twin crystal zinc cadmium sulfide nanosheet. The twin crystal interface can provide a preferential carrier migration channel, so that photo-induced electron-hole separation is further promoted, and the photocatalytic hydrogen production performance is improved.

This invention discloses a zinc-cadmium sulfide solid solution, its preparation method, and its applications. The preparation method of the zinc-cadmium sulfide solid solution of this invention includes the following steps: 1) dissolving a zinc source and a cadmium source in water to obtain a zinc-cadmium source solution; 2) dissolving a sulfur source in the zinc-cadmium source solution to obtain a precursor solution; 3) adding an alkaline solution to the precursor solution, followed by a hydrothermal reaction, and then separating, purifying, and drying the product to obtain the zinc-cadmium sulfide solid solution. The zinc-cadmium sulfide solid solution of this invention has advantages such as high catalytic efficiency and good stability, making it suitable for photocatalytic water splitting to produce hydrogen. Furthermore, its preparation method is simple, the reaction conditions are mild, the reproducibility is good, and the production cost is low, making it suitable for large-scale industrial production and application.

The application discloses a kind of polytriazine imide / cadmium sulfide quantum dot organic / inorganic photocatalytic composite material preparation method and application, belong to functional nanomaterial preparation, solar energy utilization and environmental protection technical field.The preparation of the composite material is: with urea as precursor, high crystallinity triazine imide is prepared using low-temperature molten salt method;Subsequently, in the anhydrous ethanol solution containing cadmium sulfide raw material, polytriazine imide is added, and the product obtained after heat preservation in hydrothermal reactor is the composite material.The application uses high crystallinity triazine imide as matrix, and grows cadmium sulfide quantum dots on the surface, effectively solves the problem of low utilization rate of polytriazine imide for visible light and difficult carrier separation of single-component material by constructing organic / inorganic heterojunction.The photocatalytic reduction material can be directly applied to the removal of pathogenic microorganisms in water under sunlight, solving the problem of low efficiency of traditional photocatalytic materials.

This invention belongs to the field of cadmium sulfide detection technology, specifically relating to a quantitative detection method for cadmium sulfide in a Tetrahymena culture system. The invention involves adding cadmium ions to Tetrahymena to form a Tetrahymena culture system sample, followed by ultrafiltration after disruption to separate cadmium ions into free cadmium ions (Cd). 2+ The sample was divided into two parts: cadmium sulfide (CdS) and cadmium sulfide (CdS). The cadmium content in the separated liquid sample was determined using a high-sensitivity detection technique (such as inductively coupled plasma mass spectrometry), thus obtaining the CdS content. 2+ The method not only provides information on the composition of cadmium in Tetrahymena but also dynamically monitors the efficiency of cadmium ion conversion to cadmium sulfide, providing reliable data support for assessing the remediation effect of Tetrahymena on cadmium pollution. Furthermore, this method has advantages such as ease of operation, high sensitivity, and good repeatability.