47 results about "Para nitrophenol" patented technology

The invention discloses biological charcoal loaded with iron / zinc nano-particles as well as a preparation method and application thereof. The biological charcoal loaded with the iron / zinc nano-particles comprises biological charcoal, iron nano-particles and zinc nano-particles; the iron nano-particles and the zinc nano-particles are loaded in the surface and micro-pores of the biological charcoal. The preparation method takes the biological charcoal as a carrier and the iron nano-particles and the zinc nano-particles are loaded on the biological charcoal through a front immersion method; the prepared biological charcoal loaded with the iron / zinc nano-particles has relatively good magnetism, more functional groups and relatively large specific surface area and pore volume, can be used for rapidly and effectively removing p-nitrophenol in a water body and has the advantages of great adsorption amount, strong adsorption capability, high adsorption efficiency, simplicity in operation and the like.

The invention discloses an electrochemical detection method and a detector of the nitro phenolic pollutants, wherein, the electrochemical detection method comprises the following steps: 1) sampling and introducing the samples into a sample cell which is filled with working electrodes, auxiliary electrodes and reference electrodes, and introducing nitrogen to remove oxygen; 2) applying the triangular wave voltage on the working electrodes through an electrochemical analyzer to ensure that current signals can be generated on the working electrodes; 3) transmitting the current signals to a computer through the electrochemical analyzer to convert into digital signals, showing that obvious electrochemical oxidation and reduction peaks exist in certain electric potentials, and the electrochemical oxidation and reduction peaks grow with the increase of the concentration of paranitrophenol; and 4) carrying out the linear regression method respectively on the areas of the oxidation peak and the reduction peak and on the concentration of the paranitrophenol, and calculating the concentration of the paranitrophenol according to the regression equation. The invention adopts an electrochemical sensor which takes nanoporous gold as electrodes, having the characteristics of real-time online detection, high sensitivity and high selectivity, simple operation, convenient maintenance and low detection cost.

The invention discloses a chloromethyl polystyrene resin immobilized 1-aminoethyl-3-methylimidazole bromate solid-phase extracting agent as well as a preparation method and application thereof, and belongs to the technical fields of solid-phase extraction and the pretreatment of samples. The chloromethyl polystyrene resin immobilized 1-aminoethyl-3-methylimidazole bromate solid-phase extracting agent is characterized in that the solid-phase extracting agent is made through grafting 1-aminoethyl-3-methylimidazole bromate ionic liquid on the surface of chloromethyl polystyrene resin through chemical bonding; the structural formula of the chloromethyl polystyrene resin immobilized 1-aminoethyl-3-methylimidazole bromate solid-phase extracting agent is as shown in the following descriptions. The invention also specifically discloses the preparation method and the application of the chloromethyl polystyrene resin immobilized 1-aminoethyl-3-methylimidazole bromate solid-phase extracting agent to separation and enrichment as well as the removal of paranitrophenol in a sample. The solid-phase extracting agent provided by the invention has the advantages of being simple and convenient in synthesis method, high in adsorption capacity, good in selectivity, high in anti-interference ability and high in sensitivity and being capable of being recycled, and the like.

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 discloses a graphene polymer electrochemical sensor, a preparation method and application of the graphene polymer electrochemical sensor in detection of p-nitrophenol, and the preparation method comprises the following steps of carrying out primary electrochemical treatment on a carbon-based electrode to synthesize graphene in situ on the surface of the carbon-based electrode, and then carrying out secondary electrochemical treatment on the carbon-based electrode with the graphene synthesized on the surface, polycondensating the arginine into poly-arginine, and compounding the poly-arginine with the graphene. The graphene polymer electrochemical sensor provided by the invention is low in sensing detection limit, wide in linear detection range, high in stability and low in cost, can be used for preparing a disposable pNP test strip, and can also be used for in-situ long-time continuous monitoring of pNP.

The invention relates to a waste sulfuric acid recovery and concentration process, which is based on a recovery and concentration device, and comprises a filter kettle, an extraction kettle, a rectification kettle I, a rectification kettle II, a reduced pressure evaporation kettle, an ion exchange resin column and a double condenser. According to the process for recycling and concentrating the waste sulfuric acid, the waste sulfuric acid is firstly filtered by adopting a filter membrane, and then an organic phase in the waste sulfuric acid is extracted by adding an extracting agent to be recycled, so that the environment is prevented from being polluted by disordered emission, and the organic phase is rectified to recycle a solvent while the aqueous phase is rectified and concentrated, andthe aqueous phase is treated through a column to further recover the salt; according to the method, the wastewater is from the production of the p-nitrophenol, the treated wastewater can be reused for the production of the p-nitrophenol, the purity of the p-nitrophenol is not influenced, the use amount of the sulfuric acid can be reduced, the production cost is reduced, and the economic benefit of the whole process is further improved. Therefore, the method has a prospect and is valuable in recovering and concentrating the waste sulfuric acid and improving the practicability and the economy.

The invention discloses a catalyst for hydrogenation synthesis of p-aminophenol, which comprises: a core, and a mesoporous silica shell covering the core, and the material of the core includes noble metal-magnetic oxide. The core of the catalyst in the present invention is composed of "noble metal-magnetic oxide". Because it is wrapped by the outer shell, the strong interaction between the contact interface of "noble metal and magnetic oxide" can be enhanced under the condition of avoiding agglomeration, which can greatly improve the catalyst performance. At the same time, due to the existence of magnetic oxides, they can be separated by magnets, which is convenient for recycling and improves the utilization rate. At the same time, the present invention also provides a preparation method of the catalyst, the preparation method is simple and easy to operate, the size and size of the product can be adjusted according to the needs, and it is applied to the hydrogenation reaction of p-nitrophenol, which can improve the conversion rate and selectivity of the reaction. sex.

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 discloses a parathion-methyl detection method which comprises the following steps: preparing a n-doped carbon quantum dot (N-CDs) by using a hydrothermal method; decomposing parathion-methyl under an alkali condition to generate paranitrophenol; mixing the prepared N-CDs with a hydrolysis product, namely the paranitrophenol; and enabling the paranitrophenol to absorb fluorescence ofthe N-CDs to quench the fluorescence of the N-CDs, and detecting the concentration of the parathion-methyl according to fluorescence intensity. In the method, sample pretreatment is avoided, large-size instrument or enzyme is not needed, the detection method is simple to operate, high in detection specificity, free of interference of other common pesticides, high in detection sensitivity, low in detection limit, high in stability and wide in application, and can be applied to detection on parathion-methyl in fruits, vegetables, river samples, and the like, and the cost can be greatly reduced.The method has good application prospects and potential application values in the fields of detection and analysis.

The invention relates to a nano needle-like nickel-coated graphite compound particle and a preparation method and application thereof. The nano needle-like nickel-coated graphite compound particle is a nano needle-like nickel-coated flake graphite particle. The preparation method comprises the steps: processing the flake graphite particle, putting in a chemical nickel-plating solution, stirring while reacting, performing suction filtration, washing and drying to obtain the nano needle-like nickel-coated graphite compound particle. Compared with the prior art, the nano needle-like nickel-coated graphite compound particle has the main advantages that the activity of a catalyst prepared by adopting the preparation method is relatively high, for example, the reaction rate constant (k) for catalyzing reduction paranitrophenol by NaBH4 is 8.61*10<-2>min<-1>, and is greater than the k value (the rate constant is 14.82*10<-3>min<-1>) of a graphene oxide / nickel nano composite prepared by Ji and others and used for catalyzing the reaction. The nano needle-like nickel-coated graphite compound particle prepared by adopting the preparation method is magnetic, and is conveniently recycled. The preparation method disclosed by the invention is simple, low in cost and convenient to popularize and apply.

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.