4results about How to "Many surface defects" patented technology

The preparation method comprises the following steps: adding a phosphor salt and urea into a carbon source, uniformly stirring, dissolving in water, carrying out a hydrothermal reaction at 180-200 DEG C, carrying out a series of purification operations such as suction filtration, high-speed centrifugation and dialysis, and obtaining the fluorescent carbon dots. Completely evaporating the solvent to dryness, replacing the solvent with equivalent absolute ethyl alcohol, fully dissolving by ultrasound, and filtering by using an organic filter head; the method solves the problems that the existing curcumin content detection cost is relatively high, the detection and analysis index error of a fluorescence analysis method is obvious, and the pretreatment process is relatively tedious. According to the method, after the curcumin and the fluorescent carbon dots have a synergistic effect, the characteristic half-peak width of a fluorescence emission spectrum of the coexisting solution, namely the light color purity in the coexisting solution, is regularly changed, and the content of the curcumin which promotes the change of the light color composition of the coexisting solution is measured according to the numerical value change condition of the half-peak width; and a curcumin quantitative analysis technology taking the high-performance fluorescent carbon dots as a detection medium is realized.

This invention discloses an aluminum-cobalt bimetallic ionic liquid-modified biochar catalyst, its preparation method, and its application, belonging to the technical field of water pollution control and environmental functional materials. The method involves mixing an aluminum-cobalt bimetallic ionic liquid with biomass raw materials, followed by one-step or two-step pyrolysis, then cooling, washing, and drying to obtain the aluminum-cobalt bimetallic ionic liquid-modified biochar catalyst. This method eliminates the need for prior preparation of a biochar precursor followed by secondary loading, enabling simultaneous pore formation, nitrogen doping, aluminum-cobalt bimetallic active site construction, and metal-oxygen coordination structure formation of biochar in a single pyrolysis process. The process is simple, and the raw materials are readily available. The resulting catalyst possesses a high specific surface area, abundant surface defects, and stable aluminum-cobalt synergistic active sites, enabling efficient activation of persulfate and rapid degradation of norfloxacin under near-neutral conditions. It also exhibits good anti-interference properties, cycle stability, and potential for practical water body application.

The application aims to provide a ruthenium molybdenum alloy composite defect type molybdenum oxide electrocatalyst, a preparation method and application thereof, and belongs to the technical field of electrocatalysts. The preparation method comprises the following steps: (1) adding a foamed nickel into a molybdenum salt solution, carrying out a hydrothermal reaction to obtain a Mo-O precursor, and then carrying out joule heating on the precursor to obtain a Mo / MoO x precursor; (2) soaking the Mo / MoO x precursor in a ruthenium salt solution to obtain a Ru-Mo-O precursor; and (3) carrying out joule heat pyrolysis on the Ru-Mo-O precursor under a reducing atmosphere, and obtaining the ruthenium molybdenum alloy composite defect type molybdenum oxide electrocatalyst after the pyrolysis is completed. The prepared RuMo / MoO x electrocatalyst has the advantages of uniform size and large specific surface area, and has good catalytic activity and stability, and can be used for electrocatalytic splitting of water to produce hydrogen in a full pH range.

The present invention belongs to the technical field of gas-sensitive materials, and relates to a nickel nanocluster modified porous core-shell composite indium oxide material and its preparation method and application. Including indium oxide and metallic nickel, and the molar ratio of indium oxide to metallic nickel is 1: (0-0.2); the crystalline phase of indium oxide is a composite phase composed of a cubic phase and a rhombic corundum phase, and the structure of indium oxide is a porous hollow core-shell micron spherical structure, which is composed of a shell layer wrapping a core, and a hollow cavity is formed between the shell layer and the core, wherein the shell layer is composed of porous indium oxide nanoparticles, and the core is a micron sphere assembled from porous indium oxide nanoparticles; metallic nickel is dispersed on the surface of the porous hollow core-shell micron spherical structure in the form of nanoclusters. The material provided by the present invention can detect transient NO2 at a relatively low operating temperature with high sensitivity, high selectivity, and a wide concentration range, and has excellent practical application value and industrial production prospects.