85results about How to "The pre-processing process is simple" patented technology

The invention provides a method for identifying gallnut honey by utilizing a characteristic marker, and belongs to the technical field of honey detection. According to the method, kynurenic acid is taken as a characteristic marker, quantitative detection is carried out on kynurenic acid through a high performance liquid chromatography-diode array detector method, and the content of kynurenic acid in gallnut honey is not lower than 14 mg / kg. The kynurenic acid is used as the characteristic marker of the gallnut honey for the first time, the developed identification method also can successfully discriminate the gallnut honey, and the method has the advantages of simple pretreatment, common instruments and mobile phases, low cost, short time, accuracy and the like, and is suitable for industrial production. The method has application potential in gallnut honey identification and product grading.

The invention relates to a high-degradation layered nickel-cobalt-manganese positive electrode material single-crystallization upgrading reconstruction method, which comprises the following steps: S1, discharging a waste ternary lithium ion battery, disassembling and crushing to obtain positive electrode powder; s2, mixing the obtained positive electrode powder and the selected molten salt according to a determined proportion, grinding by using a ball mill to ensure that the molten salt and the recycled powder are uniformly mixed, then performing a lithium supplementing process under a high-temperature condition, and meanwhile, effectively removing impurities such as a residual binder and a conductive agent in the positive electrode powder; the lithium supplement heating condition is that the temperature is raised to 600 DEG C, heat preservation is performed for 2 hours, then heat preservation is performed for 4-6 hours at 910-930 DEG C, the temperature raising speed is 4 DEG C / min, and the gas atmosphere is air. And S3, the sample after lithium supplementation is completed is subjected to heat treatment in the oxygen atmosphere, impurity phase structures possibly existing on the surfaces of particles are repaired, the electrochemical performance of the regenerated material is close to the performance of a commercial battery, meanwhile, due to the unique single-crystal structure, the structural stability of the regenerated material is greatly improved. The method can be applied to recovery of various ternary lithium ion battery positive electrode materials by simply adjusting the heating temperature and the heat preservation time, and has very high application value.

The invention relates to a method for detecting energy metabolites based on UPLC-MSMS (ultra performance liquid chromatography-mass spectrometry) and application thereof. The method comprises the following steps: after a sample is extracted, detecting a sample extracting solution and a standard solution by adopting an ultra performance liquid chromatography-mass spectrometry combined method; a mobile phase adopted by the ultra-high performance liquid chromatography is as follows: a mobile phase A is a 5-15mM ammonium acetate aqueous solution with the pH value of 9-10; and the mobile phase B is 95-100% acetonitrile. According to the method, after the tissue sample is extracted and subjected to liquid chromatography separation, the metabolite in the energy metabolism pathway is qualitatively and quantitatively detected in a targeted mode, and due to the high selectivity of the high-resolution mass spectrum, parameter optimization does not need to be conducted on each metabolite.

The invention discloses a method and a kit for determining various free fatty acids in body fluid by liquid chromatography-tandem mass spectrometry. The method comprises the following steps: pre-treating a biological fluid sample by introducing an isotope internal standard, protein precipitation, liquid-liquid extraction and an automatic pipetting platform, then separating an isomeride and an interferent through liquid chromatography, carrying out mass spectrometry scanning monitored by tandem mass spectrometry multi-reaction, making a standard curve by using a calibrator, and quantifying, and low, medium and high quality control products continuously monitor the performance of the method. The method realizes the purpose of simultaneously analyzing and detecting 22 free fatty acids and 20 D / 13C labeled isotope hormones in a sample by using the UPLC-MS / MS technology without using solid-phase extraction and non-derivatization treatment, has the advantages of rapidness, simplicity and convenience in operation, multiple detection types, high flux, high accuracy and low cost, can be applied to content detection of low-content free fatty acid level, and has a wide application prospect. The research on a lipid metabolism pathway is facilitated.

The utility model discloses a paper and water contact angle test sample pretreatment table device which comprises a working table, a sample table arranged at the top of the working table, mucilage glue arranged on the side wall of the sample table in a surrounding mode, a tension sensor used for monitoring tension changes of paper in real time arranged in the sample table, and a plurality of inclined track grooves formed in the periphery of the sample table. A linear motion sliding table is installed in the inclined rail groove, a telescopic rod is installed on a sliding plate of the linear motion sliding table, the output end of the telescopic rod is vertically upward and provided with a clamp used for clamping paper, an annular cutter is further arranged above the sample table, and the inner diameter of the annular cutter is smaller than the outer diameter of the sample table. The two ends of the annular cutter are connected with a lifting air cylinder arranged on the workbench. A bubble level for leveling the workbench is also arranged on one side of the sample table; by means of the design, the technical problems that in a traditional treatment mode, complex pretreatment, such as flat layer coating or special paper adopting, usually needs to be conducted on paper, the operation difficulty is high, and a test result deviates from a true value are solved.

The invention relates to a method for identifying lysimachia christinae hance and desmodium styracifolium, in particular to a method for simultaneously and rapidly identifying the lysimachia christinae hance and the desmodium styracifolium, and aims to solve the problems that the desmodium styracifolium and the desmodium styracifolium are easy to confuse and have many similarities in the aspects of characters, microscopic characteristics and the like, the character identification and microscopic identification processes are complicated and are not easy to observe, and the Therefore, the method is difficult to distinguish from characters and microscopes, and is not easy to operate. A liquid phase content detection and identification method is high in cost and long in time; in order to overcome the defects of difficulty in operation, tedious and complicated process and unstable detection result by adopting a thin-layer identification method, the method for simultaneously and quickly identifying the lysimachia christinae hance and the desmodium styracifolium comprises the steps of ultrasonic extraction, thin-layer sample application, developing by utilizing a developing solvent, developing and inspecting, and the lysimachia christinae hance and the desmodium styracifolium are directly identified and distinguished. Used materials are convenient to obtain, the process is simple, and the efficiency of thin-layer identification is effectively improved.

The application relates to the technical field of building information technology and discloses a building 3D model automatic generation method and system based on a DXF file, which comprises the following steps: extracting floor numbers by analyzing the file name of a multi-floor DXF file, performing concurrent format conversion on multiple files to generate GeoJSON data, identifying building components such as walls, doors, windows and rooms of each floor through geometric semantic analysis to generate a floor building semantic model, assembling and generating a complete 3D building model according to the floor sequence based on the semantic model, and simultaneously realizing asynchronous task scheduling of each link by using a distributed micro-service architecture. The application can realize full-automatic, efficient and high-precision generation of a building 3D model, greatly reduces the modeling cost and technical threshold, and is suitable for application requirements of multiple scenes such as building design, real estate display and city digital twinning.

The present application relates to a kind of spectral analysis system and method, specifically, a kind of laser-induced breakdown spectroscopy analysis system and method based on suspended electrode and filter paper.The system includes filter paper, adjustable sample stage, high-voltage discharge device, suspended electrode, laser ablation device and spectral signal acquisition and analysis device.The present application uses suspended electrode to change the distribution characteristics of high-voltage electric field, increase local electric field line density and electric field intensity, improve the collision frequency of charged particles in plasma, so as to further enhance the detection sensitivity of LIBS to trace elements, and reduce its detection limit.High-voltage discharge device is used to excite laser plasma again, to improve the detection and analysis ability of target elements.Filter paper enrichment method is used for pretreatment of the sample to be measured, which can effectively reduce the interference of liquid matrix on plasma spectral signal, and improve the sensitivity and stability of detection signal.

The invention provides a detection method for determining nitrosamine compounds in cold medicines based on gas chromatography-tandem mass spectrometry. The detection method comprises the following steps: (1) preparing a standard stock solution; (2) preparing a standard series stock solution; (3) injecting the standard series stock solution into a gas chromatograph-mass spectrometer for detection to obtain a standard mass chromatogram of the corresponding nitrosamine compound, and taking the quantitative ion pair peak area of the nitrosamine compound as a vertical coordinate and the concentration of the nitrosamine compound in the standard series stock solution as a horizontal coordinate to obtain a standard working curve; (4) sample extraction; and (5) injecting the purified sample into a gas chromatograph-mass spectrometer to obtain a mass chromatogram of the purified sample, and if a chromatographic peak corresponding to a standard mass chromatogram exists in the mass chromatogram of the purified sample, substituting the chromatographic peak into the standard working curve to obtain the type and content of the nitrosamine compound in the purified sample. The detection method is high in precision, high in speed and accurate in result.

The invention discloses a method for synchronously recovering lithium, copper, cobalt, nickel and manganese in a waste ternary lithium battery, which comprises the following steps of: carrying out reduction smelting on the waste ternary lithium battery in a smelting furnace, adding calcium chloride, limestone and quartz stone in the reduction smelting process for slagging, and reducing copper, cobalt and nickel elements in a battery material into an alloy; lithium and manganese elements are converted into volatile lithium chloride and manganese chloride in the smelting process, the volatile lithium chloride and manganese chloride enter a gas phase to be collected, and then lithium carbonate and manganese hydroxide are prepared through a water washing-sodium hydroxide precipitation-sodium carbonate precipitation method. According to the method, synchronous recovery of lithium, nickel, cobalt, copper and manganese is achieved, and compared with an existing wet treatment process, the treatment capacity is larger, pretreatment is simpler, the recovery technological process is shortened, and the economic cost is reduced.

The application discloses a method for simultaneously and rapidly detecting the concentration of four immunosuppressants, comprising the following steps: mixing a blood sample with an internal standard solution containing ascomycin, cyclosporine-d4, sirolimus-d3 and everolimus-d4, adding a precipitant and centrifuging to obtain a sample to be detected; injecting into a liquid chromatography-tandem mass spectrometry system for analysis to obtain original data containing the retention time window and mass spectrum response signal of four analytes; searching the original data based on an interferent database, wherein the interferent database contains a plurality of compounds that can possibly generate mass spectrum signal interference and characteristic ion information thereof; inputting the original data and the searched potential interferent information into a machine learning model to output a net mass spectrum response value after interference correction; and calculating the concentration of tacrolimus, cyclosporine, sirolimus and everolimus in the blood sample according to the obtained net mass spectrum response value, the mass spectrum response value of the corresponding internal standard and a pre-established standard curve.

The invention provides a method and a kit for determining various steroid hormones in body fluid by liquid chromatography-mass spectrometry. The method comprises the following steps: pre-treating a biological fluid sample by introducing an isotope internal standard, a salting-out auxiliary reagent, an extracting agent and an automatic pipetting platform, then separating an isomeride and an interferent through liquid chromatography, switching quantitative ions and qualitative ions with positive-negative scanning characteristics by tandem mass spectrometry, making a standard curve by using a calibrator for quantification, and finally determining the content of the biological fluid sample. And low, medium and high quality control products continuously monitor the performance of the method. According to the method, the aim of simultaneously analyzing and detecting 28 steroid hormones and 24 D / 13C / 15N labeled isotope hormones in a sample by using a UPLC-MS / MS technology without using solid-phase extraction and non-derivatization treatment is achieved, and the method is rapid, simple and convenient to operate, multiple in detection variety, high in flux, high in specificity, low in cost, high in sensitivity and high in sensitivity. 28 indexes of a steroid hormone metabolic pathway are effectively and systematically monitored.

The embodiment of the present application discloses a feeding method for improving the survival rate and weight of Polyphylla laticornis larvae in the process of processing and converting fungus dungs. The feeding method comprises the following steps: S1: obtaining the feces generated in the feeding process of 2nd instar and / or 3rd instar Polyphylla laticornis larvae; S2: obtaining the feces substrate formed by the feces; S3: putting the 2nd instar Polyphylla laticornis larvae into the feces substrate, and placing them in an environment with a temperature of 28±2 DEG C and a light cycle of L:D = 16h:8h for feeding for 10 days, and the substrate humidity is controlled at 50%-55%; S4: picking or screening the larvae fed for 10 days from the feces substrate, and putting them into fungus dung substrate for further feeding. The present application can improve the survival rate and weight of Polyphylla laticornis larvae in the process of processing and converting fungus dungs, improve the utilization rate of insect feces, simplify the pretreatment process of fungus dungs, and reduce the feeding cost. The feeding method is simple and feasible, convenient to obtain materials, and has a great promoting effect on the processing and converting fungus dungs industry of Polyphylla laticornis.

This application discloses an electronic atomized product and a method for determining its nicotine content. The nicotine content in this electronic atomized product is no higher than 500 ng / g, simulating the action and visual experience of smoking, assisting users in adapting to the transition phase without nicotine dependence, and aiding in smoking cessation. The method for determining the nicotine content in the electronic atomized product includes: ultrasonic extraction of the sample using ultrapure water; liquid chromatography separation using an alkaline aqueous phase (pH 9.22–10.76) and acetonitrile as the mobile phase; positive ion ionization using an electrospray ionization source; and detection of nicotine characteristic ions using a single quadrupole mass spectrometer in selected ion monitoring mode, achieving highly sensitive, highly selective, low-cost, stable, and reliable quantitative analysis of nicotine content.

The invention relates to a method for simultaneously determining related substances of glycine and methionine. The method comprises the following steps: step 1, preparing a blank auxiliary material solution; step 2, preparing a test solution; step 3, preparing a reference solution; step 4, preparing a system applicable solution; and step 5, detecting. Compared with a traditional method, the method has the advantages that the related substances in the glycine and the methionine can be simultaneously determined, the sample pretreatment is simple, the compound retention time is stable, the instrument configuration requirement is low, the analysis cost is reduced, the sensitivity is high, the impurity separation degree is good, and the related substances in the glycine and the methionine can be effectively separated.

A method for detecting the enantiomers of furanyl linalool oxide glucoside in tea leaves belongs to the technical field of tea leaf detection and analysis. It comprises the following steps: preparing a furanyl linalool oxide glucoside racemic standard solution; performing chiral ultra-high performance liquid chromatography-mass spectrometry analysis on the furanyl linalool oxide glucoside standard solution to determine the qualitative parameters of the furanyl linalool oxide glucoside enantiomers, and drawing a standard working curve of the furanyl linalool oxide enantiomers; performing chiral analysis on the furanyl linalool oxide glucoside enantiomers in the tea soup under the same conditions; and calculating the content of the furanyl linalool oxide glucoside enantiomers in the tea leaves by referring to the qualitative parameters and the standard working curve in the standard product. The present invention can realize the accurate qualitative and quantitative detection of the furanyl linalool oxide glucoside enantiomers in tea leaves.

The application discloses a mechanical-chemical preparation method of potassium borohydride, and belongs to the technical field of potassium borohydride preparation. The method is characterized in that magnesium-based reducing agent, hydrogen supplementing agent and potassium borate hydrate are used to prepare potassium borohydride through a mechanical-chemical method under a protective atmosphere, and the prepared potassium borohydride is subjected to yield testing and purification under an air atmosphere. The method can realize solid-phase mechanical-chemical reaction under a vibration or low-energy planetary ball milling condition, breaks through the limitation that the reaction must be driven by high-energy ball milling equipment in the prior art, and can realize synthesis of potassium borohydride with a yield of more than 90% through low-energy planetary ball milling, so that the method has large-scale production application potential. In addition, the method has the advantages of simple process, convenient operation and low cost.

The present invention belongs to the technical field of waste gas treatment, and specifically discloses a waste gas treatment device for a reactor, including a filter box, wherein the four corners of the upper side of the filter box are respectively vertically connected with a first air inlet pipe, a second air inlet pipe, a first air outlet pipe and a second air outlet pipe, the first air inlet pipe and the second air inlet pipe are horizontally connected with an air inlet main pipe, the first air outlet pipe and the second air outlet pipe are horizontally connected with an air outlet main pipe, activated carbon is placed in the filter box, a fixing ring is fixedly provided in the middle of the first air inlet pipe, the second air inlet pipe, the first air outlet pipe and the second air outlet pipe, a cam-type two-way switching filter mechanism is provided on the lower side of the fixing ring, and a vortex dust separation and temperature control mechanism is provided at one end of the air inlet main pipe. The present invention adopts a two-way ventilation design, so that the waste gas alternately enters from both sides of the activated carbon bed layer, effectively avoiding the problem of uneven saturation of activated carbon adsorption, and adopts a vortex dust separation and temperature control mechanism to achieve waste gas cooling and particle separation, simplifying the pretreatment process.

The application discloses Au@PATP@Ag NRs nanomaterial and a preparation method and application thereof. The application also discloses a method for qualitatively and quantitatively detecting nicotine concentration based on surface enhanced Raman scattering technology and application thereof. The Au@PATP@Ag NRs nanoparticles are used as active base materials of SERS, and a target object is analyzed and detected by using a Raman spectrometer. According to a linear relation equation of a ratio of SERS signal intensity of different concentrations of nicotine solution to characteristic peaks of nicotine and an internal standard substance, the content of nicotine in a solution to be detected can be obtained, and the detection sensitivity of nicotine is greatly improved. The internal standard molecule is introduced into the core-shell structure, and the accuracy of quantitative detection of nicotine is improved. The application also has great application in sensitive detection of nicotine in cigarettes and environmental cigarette smoke. In addition, the application also has the advantages of simple principle, rapidness, simple pretreatment, high selectivity, high detection sensitivity and the like.

This invention discloses a graphene oxide-based monovalent cation-selective membrane and its applications, belonging to the field of separation technology. The monovalent cation-selective membrane comprises graphene oxide, with tannic acid anchored between the graphene oxide layers via hydrogen bonding and π-π stacking to form a first cross-linked network. Dioctadecyl dimethyl ammonium bromide is anchored between the graphene oxide layers via electrostatic adsorption and forms a second cross-linked network with tannic acid through electrostatic attraction. Dioctadecyl dimethyl ammonium bromide is added to an alkaline aqueous solution of graphene oxide, followed by the addition of tannic acid and thorough mixing. The mixture is then filtered to form a membrane, which is subsequently dried and annealed to obtain the monovalent cation-selective membrane. This invention can simultaneously improve the monovalent / divalent cation sieving performance and ion flux of the membrane, while also enhancing its permeation energy generation capacity. It breaks the trade-off between selectivity (sieving characteristics) and flux in ion-selective membranes, providing a new approach and technical reference for the development of multifunctional ion exchange membranes for complex water bodies.

The application provides a method for improving the sensitivity of liquid chromatography-mass spectrometry in detecting vitamin K1 in serum, which comprises the following steps: preparing a sample solution of vitamin K1 to be detected by using a liquid-liquid extraction method to obtain an initial sample solution; and redissolving the initial sample solution by using an aqueous solution containing at least isopropanol as a redissolving agent to obtain a sample solution to be detected; and adding ammonium fluoride after an LC-MS column to improve the mass spectrometry detection sensitivity of the vitamin K1 sample. By using the technical scheme of the application, isopropanol or isopropanol+methanol is used as a redissolving agent to replace methanol in the prior art as a redissolving agent, the mass spectrometry detection sensitivity of VK1 is improved, the recovery rate is improved, the detection method has good stability, and the clinical detection requirements can be met; meanwhile, the ammonium fluoride in the liquid chromatography can be completely replaced, the system pressure of the liquid chromatograph is reduced, and the service life of the chromatographic column is prolonged.

This invention discloses an image measurement device and method based on real-time compensation using a laser interferometer. The device includes an X-axis guide rail, an X-axis air-bearing moving platform mounted on the X-axis guide rail, a Y-axis guide rail mounted on the X-axis air-bearing moving platform, a Y-axis moving platform mounted on the Y-axis guide rail, an image acquisition module mounted on the Y-axis moving platform, an X-axis laser interferometry module, a Y-axis laser interferometry module, an X-axis position detection module, and a Y-axis position detection module. This invention accurately measures the straightness errors of the X-axis and Y-axis guide rails in the horizontal and vertical directions using the X-axis and Y-axis laser interferometry modules, respectively. The straightness deviations of the two guide rails are quantified and integrated into the overall positioning error to achieve real-time dual-axis compensation, improving positioning accuracy. Combined with the deep linkage between the positioning system and the image measurement system, this invention meets the practical needs of the precision image measurement field.

The application relates to the technical field of raw material pretreatment, in particular to an activated carbon fiber raw material pretreatment device, which comprises a treatment box, a base fixedly installed at the bottom of the treatment box, a feeding hopper fixedly connected to the top end of the treatment box, a discharging pipe fixedly connected to the bottom end of the treatment box, two crushing rollers arranged in the treatment box, and a driving structure arranged on the treatment box and used for driving the two crushing rollers to rotate in opposite directions; a filter plate is arranged below the crushing rollers in the treatment box, the filter plate is in an inverted V-shaped structure, guide plates are fixedly connected to the two sides of the filter plate, and a shaking unit for driving the filter plate to shake is arranged in the treatment box; the uniformity of the discharging granularity is ensured, the utilization rate of the raw material is improved, and manual collection of the unfiltered raw material and refeeding of the raw material into a crusher for secondary crushing are not needed.

A pTau181 chemiluminescent immunoassay kit for Alzheimer's disease and its preparation method and detection method belong to the field of immunoassay technology. In order to solve the problems of complex operation, high cost, long detection time, low sensitivity and poor precision of the existing Alzheimer's disease detection kit, the present invention includes a magnetic particle reagent, an AE-labeled pTau-181 antibody, and a pTau-181 calibrator. The magnetic particle reagent is a magnetic microsphere suspension coated with a pTau-181 antibody; the AE-labeled pTau-181 antibody is obtained by labeling the pTau-181 antibody with an acridinium ester. The present invention has low sample pretreatment requirements, a simple pretreatment process, can quickly and high-throughput detect a large number of samples, and the inspection method is convenient and easy, filling the gap in the prior art.

The invention relates to a method for detecting residues of thiamethoxam and six metabolites of thiamethoxam on chili and chili products, and belongs to the technical field of chili pesticide residue detection. The detection method comprises the following steps: 1) sample extraction and purification: extracting fresh chili, dry pickled chili, wet pickled chili, fermented chili, chili sauce and chili leaf samples by adopting 2% acetic acid-acetonitrile, and purifying by adopting C18 and GCB; 2) calculating standard curves and linear correlation coefficients of thiamethoxam and metabolites thereof; and 3) calculating the addition recovery rate, the relative standard deviation and the method quantitation limit. The standard recovery rate of the seven compounds in the six matrixes is 71%-107%, RSD is smaller than 9.53%, it is proved that the repeatability and reproducibility of the detection method are acceptable, and an analysis method can be provided for simultaneous detection and research of thiamethoxam and six metabolites thereof in fresh chilies, dry pickled chilies, wet pickled chilies, fermented chilies, chilli sauce and chilli leaves.

An apparatus (1) for pre-treating the recovery of industrial textiles (F), the apparatus (1) having a feed direction (D) and a transverse direction (C). The device (1) comprises a movable frame (7) and a plurality of members mounted on the frame (7), wherein the plurality of members comprise a nip (N) with a drive roller (2) and at least one cutting blade (4a, 4b, 4c). A method for pre-treating the recovery of industrial textiles (F) is also disclosed.

The invention provides a method for visually detecting dicamba based on a fluorescence-enhanced molecularly imprinted ratiometric fluorescent probe, relates to the technical field of visual detection methods, and comprises the method for visually detecting dicamba based on the fluorescence-enhanced molecularly imprinted ratiometric fluorescent probe. A visual detection technology based on a fluorescence-enhanced molecular imprinting ratio fluorescent probe shows subversive potential, and the method not only simplifies a sample pretreatment process and greatly shortens the detection time, but also has the advantages of remarkable cost benefit, simplicity and convenience in operation and no need of complicated laboratory equipment, and more importantly, the method has a good application prospect. Through the accurate recognition characteristic of the molecular imprinting technology, the specificity of fluorescence sensing analysis is greatly improved, non-specific interference can be effectively overcome, and a target compound can be accurately locked even in a complex matrix.

The utility model provides a sludge and household garbage blending combustion feeding and conveying system. The system comprises a sludge temporary storage bin; one end of the closed scraper conveyor is connected with a bottom outlet of the sludge temporary storage bin, and the other end of the closed scraper conveyor is connected to an inlet of the bucket elevator; the multi-stage granulation device comprises a first-stage granulation temporary storage bin, a first-stage distributor, a plurality of second-stage granulation temporary storage bins and a plurality of second-stage distributors; an inlet of the primary granulation temporary storage bin is connected to an outlet of the bucket elevator; an outlet of the first-stage granulation temporary storage bin is connected to all the second-stage granulation temporary storage bins through a first-stage distributor; the number of the second-stage granulation temporary storage bins is consistent with that of the second-stage distributors; an outlet of each second-stage granulation temporary storage bin is connected with a second-stage distributor; and the outlets of all the secondary distributors are connected with an incineration hearth. Sludge is directly poured into the sludge temporary storage bin through the discharging trolley, the sludge firstly falls into the sludge temporary storage bin through the feeding grid by means of the gravity borne by the sludge, and then large sludge blocks are subjected to crushing pretreatment through the crushing device; the pretreatment process of the sludge is simplified, and intermediate links are reduced, so that the sludge treatment efficiency is improved.

The invention discloses an Au (at) M (at) Ag NRs nano material as well as a preparation method and application thereof. The Au (at) M (at) Ag NRs nano material is composed of an Au (at) Ag NRs core-shell structure and 4-mercaptobenzoic acid coated inside the Au (at) Ag NRs core-shell structure. According to the method, Au (at) M (at) Ag NRs is used as a sensing material for dual-mode detection, an ultraviolet absorption peak is measured by adopting an ultraviolet-visible spectrograph, and the content of kaempferol in a solution to be detected is obtained according to a known linear relation equation between kaempferol solutions with different concentrations and displacement values of the ultraviolet absorption peak. Meanwhile, measuring a Raman signal by adopting a Raman spectrometer, and obtaining the content of kaempferol in the solution to be detected according to a known linear relation equation between kaempferol solutions with different concentrations and the Raman signal intensity. According to the invention, through linear discriminant analysis (LDA), five polyphenols with different antioxidant capacities, namely chlorogenic acid, epicatechin, epigallocatechin gallate, kaempferol and tannic acid, are successfully distinguished.

The invention discloses a low-temperature sulfur-resistant ammonia-escape-resistant SCR flue gas denitration catalyst and a preparation method thereof. The catalyst comprises a carrier plant ash, and manganese oxide and cerium oxide loaded on the carrier, the plant ash contains carbonate, silicate and alkali metal oxide; the preparation method comprises the following steps: (1) combusting and refining the forestry waste to obtain plant ash powder; and (2) adding water into manganese salt and cerium salt to prepare a mixed solution, adding the plant ash powder obtained in the step (1) into the mixed solution, and uniformly mixing, drying and calcining to obtain the composite material. According to the catalyst, components such as carbonate, silicate and alkali metal in the plant ash are fully utilized, generation of residues is greatly reduced, the utilization rate of the plant ash is greatly increased, and the catalyst is high in denitration activity, wide in active temperature window, capable of keeping high denitration activity at the temperature of 100-300 DEG C, good in low-temperature sulfur resistance, high in ammonia conversion rate and low in cost. And the generation of escaping ammonia is effectively reduced.