48 results about "Para nitrophenol" patented technology

The invention discloses a micro-nanometer composite. The micro-nanometer composite is an urchin-like Ni-Co-P metallic composite, and the structure of the micro-nanometer composite is determined as Ni@Ni3P@CoP2@P through XRD (X-Ray Diffraction) representation. The invention discloses another micro-nanometer composite. An urchin-like Ni-Co-Pd-P metallic composite is formed through introducing nanometer palladium on the basis of the Ni-Co-P metallic composite. The invention further discloses a preparing method and application thereof for the two micro-nanometer materials. The Ni@Ni3P@CoP2@P is synthesized through a one-step hydrothermal method, palladium salt is absorbed on the basis of the Ni-Co-P composite, a reductant is added, and nanometer palladium is introduced. The synthesized Ni-Co-Pd-P has great catalytic and circulating effects on the reduction of para-nitrophenol.

The invention belongs to the field of fluorescent functional materials, in particular to a water-soluble silicon quantum dot and its preparation method, and its application in the high-sensitivity and high-selectivity detection of p-nitrophenol. The key points of the technical scheme of the present invention are: 3-aminopropyltriethoxysilane is added to ultrapure water at 85°C and vigorously stirred for 10 minutes, then added with acetaminophen solution, and continuously stirred for 5 hours. The silicon quantum dot synthesis method of the invention is simple and convenient, has mild reaction conditions, high quantum yield, good water solubility, long-term storage, and can maintain excellent fluorescence performance even under different pH and different ion strength conditions. The silicon quantum dot emits 495nm fluorescence under excitation of 398nm fluorescence, and p-nitrophenol can specifically quench the fluorescence of the silicon quantum dot. The silicon quantum dot of the present invention shows good application prospects in the aspects of fast, efficient, high selectivity and high sensitivity detection of p-nitrophenol.

The invention relates to the field of material technology, and specifically discloses a multiphase nanocomposite material, a preparation method thereof, a nitro reduction catalyst, and applications. The multiphase nanocomposite material exhibits good catalytic performance for p-nitrophenol reduction. Amorphous alumina powder, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and ammonium chloride are used as raw materials, and a simple method is used to realize the preparation of multi-phase nanocomposites. The whole process is simple and green, with strong controllability, suitable for large-scale Industrial production, while the cobalt-nickel alloy nanoparticles in the heterogeneous nanocomposite materials are highly dispersed on the amorphous alumina nanosheets to avoid their polymerization or deactivation during the catalytic process, and realize the existing nanocatalysts for nitro reduction reaction in On the basis of reducing costs, avoid the problem of irreversible inactivation caused by aggregation or leaching. However, the preparation method of the multiphase nanocomposite material provided is simple, and has important application prospects in the field of chemical production.

The invention discloses a hydrothermal preparation method of a carbon-based catalyst used for the catalytic hydrogenation of paranitrophenol. The hydrothermal preparation method is characterized in that: taking microcrystalline cellulose as a raw material and different non-noble metal compounds as a doping source, conducting high-temperature high-pressure hydrothermal treatment, filtering to obtain a deep brown solid product, respectively washing with deionized water and absolute ethyl alcohol for a plurality of times to remove an organic matter on the surface of the product, drying, and grinding. An obtained catalyst precursor is put into a tubular calcinatory, and is calcined under the nitrogen atmosphere at the high temperature for a certain period of time to obtain the metal doped carbon-based catalyst with excellent stability. The catalytic efficiency of the carbon-based catalyst on generation of aminophenol through catalytic hydrogenation of the paranitrophenol is explored in a normal-temperature normal-pressure reaction system. The operation process has the main characteristics that: the cellulose, a biomass resource, is utilized, the operation process is environment-friendly and cheap and is easy to get, the catalytic activity of the non-noble metals is neutral, the reaction conditions are mild, an active center and a carbon material are synchronously generated, so that the structure is more stable, the catalytic reaction is conducted under the conditions of normal pressure and normal temperature, and the reaction process is simple to operate.