95 results about "Microwave method" patented technology

The application discloses a method for preparing high-purity battery-grade lithium sulfide by reducing lithium sulfate with a reducing gas. The specific steps are as follows: raw material lithium sulfate and inert wave-absorbing substances are mixed, uniformly mechanically ball-milled, tablet-pressed, sieved, put into a microwave reactor, and then a reducing gas is introduced for microwave heating reaction; after cooling to room temperature, the mixture is discharged into another reactor, ethanol is added for dissolution, mechanical stirring is carried out, and then standing and filtration are performed; the inert wave-absorbing substances are recycled and reused; an ethanol solution of dissolved lithium sulfide is obtained; crude lithium sulfide is obtained by heating and distillation; after freeze-drying, the crude lithium sulfide is heated and secondarily calcined in a rotary furnace under the protection of inert gas, and finally battery-grade high-purity lithium sulfide is obtained. By mixing the inert wave-absorbing substances with the lithium sulfate and heating by the microwave method, the contact surface of the lithium sulfate and the gas can be improved, and in addition, the internal heating method can be used to avoid the lithium sulfide formed on the outer surface from wrapping the raw material lithium sulfate, so as to affect the hydrogen reduction efficiency.

The invention discloses a microwave-assisted green micro-nano platinum powder preparation method and application thereof. The method comprises the following steps: a) preparing a platinum ion solution; b) adding a dispersing agent and a surfactant; c) adding a reducing agent; d) microwave heating reaction; e) separating and purifying a product; and f) drying: drying the product at low temperature to obtain the micro-nano platinum powder. Through microwave field enhanced mass transfer and nucleation kinetics, compared with a traditional chemical reduction method, the reaction efficiency is improved by 80% or above, high-temperature and high-pressure conditions are not needed, and the process energy consumption is reduced by about 60%. The obtained platinum nano-powder is excellent in dispersity, the specific surface area reaches 20-50 m < 2 > / g, and the platinum nano-powder shows high activity in a proton exchange membrane fuel cell catalyst. The method is suitable for continuous production, and an efficient solution is provided for application of the high-performance platinum-based material in the fields of catalysis, new energy and electronic devices.

The invention discloses a narrow-linewidth double-frequency laser generation method, and belongs to the technical field of microwave photons. Two paths of optical signals generated by two semiconductor lasers with different wavelengths are injected into the same optical microcavity, the two paths of optical signals enter a self-injection locking state in different modes of the optical microcavity, and the optical microcavity can output narrow-linewidth double-frequency laser. The invention further discloses a narrow-linewidth double-frequency laser generating device and a photo-production microwave method and device. Two double-frequency lasers with different frequencies are locked on one optical microcavity through an original double-self-injection locking technology, the problem of phase noise of a double-frequency light source is effectively solved while the linewidth of the input laser is narrowed, common-mode noise caused by mode difference of the two lasers in a locking state is eliminated, and the dual-frequency light source has the advantages of being simple in structure and convenient to operate. And the traditional servo locking technology is not needed, so that the complexity of the system is simplified.

The invention provides an intelligent production allocation system based on microwave moisture content measurement, and relates to the technical field of intelligent layered fine production allocation operation of petroleum and natural gas wells. Comprising a ground control module used for opening an underground tester of each oil layer in an underground separate mining test module; the ground testing module is used for measuring the flow of the underground produced liquid in each oil layer in real time when oil is exploited layer by layer, and measuring the water content of the underground produced liquid in each oil layer in real time by utilizing a microwave method; the ground control module is further used for determining an oil nozzle opening degree adjusting instruction of each underground tester according to the water content and the flow and adjusting an oil nozzle switch of each underground tester according to the oil nozzle opening degree adjusting instruction; and the underground separate mining test module is used for mining petroleum of each oil layer through the adjusted oil nozzle switch. Therefore, the accuracy and the stability of the measurement of the water content are high.

The invention discloses a high-dispersion cobalt-based catalyst and a preparation method and application thereof, and belongs to the technical field of cobalt-based catalysts.The preparation method comprises the steps that tetracarboxyl cobalt phthalocyanine and nitrogen-defect carbon nanotubes serve as raw materials, a pre-assembled compound is formed in an organic solvent through molecular self-assembly, then programmed microwave heating is conducted on the pre-assembled compound, and the high-dispersion cobalt-based catalyst is obtained. According to the high-dispersion cobalt-based catalyst and the preparation method thereof disclosed by the invention, a means of combining a specific molecular precursor and carrier defect engineering is utilized, a'molecular anchor-anchor positioning 'pre-connection system is constructed through liquid-phase pre-assembly, and a programmed microwave energy accurate input principle is supplemented, so that the high-dispersion cobalt-based catalyst is obtained. The key technical problems that when the cobalt-based catalyst is prepared through an existing microwave method, metal atoms are prone to agglomeration, the active site structure is uncontrollable, and the catalytic performance is ordinary are successfully solved.

The invention relates to the technical field of corrosion resistance, in particular to a towel rack surface corrosion-resistant spraying process, which is characterized in that a towel rack is treated in a spraying manner, and modified graphite phase carbon nitride is introduced into a protective coating as a filler by performing component design on the coating for spraying and then performing light curing treatment; the preparation method comprises the following steps: by taking tyrosine and thiourea as precursors, preparing graphite phase carbon nitride nanosheets by a microwave method, then preparing a zinc oxide-graphite phase carbon nitride binary composite nanomaterial by a hydrothermal method, carrying out double-bond treatment on composite graphite phase carbon nitride by utilizing vinyltriethoxysilane, and then grafting long-chain alkyl modified polysilazane containing double bonds; the preparation method comprises the following steps: by taking castor oil as a raw material, synthesizing a prepolymer together with isophorone diisocyanate under the action of a catalyst, taking 3-dimethylamino-1, 2-propylene glycol as a chain extender, taking 2, 2-dimethylolpropionic acid as a hydrophilic chain extender, and taking hydroxyethyl methylacrylate and hydroxylated long-chain alkyl modified polysilazane as end-capping reagents.

The invention discloses a preparation method of a zinc-based composite piezoelectric catalyst, which adopts a microwave-oil bath combined method to more quickly and conveniently prepare a zinc oxide-zinc sulfide composite catalyst. Compared with a hydrothermal method of a drying oven, the microwave method has the advantages that the capability of microwaves penetrating through an object is extremely high, so that the object can quickly and uniformly absorb the microwaves and spread over the whole object, the heating process becomes quick and stable, and the microwave method is more time-saving and efficient; the zinc oxide is partially vulcanized in an oil bath manner, so that the high-temperature reaction of a hydrothermal method is avoided, and the cost is lower. Besides, the zinc oxide-zinc sulfide composite piezoelectric catalyst prepared by the method has excellent cycle stability in piezoelectric catalytic hydrogen production, and after 50 hours of cycle, the average yield of piezoelectric catalytic hydrogen evolution is only reduced by 12.2% and tends to be stable.

The invention discloses a method for preparing micro-nano copper oxide powder through a microwave method and application of the micro-nano copper oxide powder. The method comprises the following steps: a) preparing a copper ion solution; b) adding a dispersing agent and a surfactant; c) adding urea; d) microwave heating reaction; e) separating and purifying a product; and f) drying and calcining. According to the preparation method, the rapid heating characteristic of microwave radiation is utilized, the effect of urea is combined, dispersing agents such as polyvinylpyrrolidone (PVP) and the like and surface active agents are added into a solution containing copper ions, the copper oxide nano-particles with the particle size distribution being 50-100 nanometers and even being controllable to be in the micron order are prepared, and the copper oxide nano-particles have good crystal structures and dispersity; the method is simple in process, high in reaction speed and low in energy consumption, and the obtained copper oxide nano particles can be used for preparing high-performance and high-purity copper oxide nano materials and have wide application prospects.

The invention discloses a preparation method of a wide-layer-distance novel aluminum dihydrogen phosphate layered material based on a microwave method, which comprises the following steps: (1) dispersing MXene in a solvent for ultrasonic dispersion, adding a Py monomer, and uniformly stirring; dropwise adding APS to carry out oxidative polymerization, and carrying out in-situ polymerization on polypyrrole on the surface of the MXene sheet layer; after the reaction is finished, centrifuging, washing and drying a product to obtain MXene coated PPy composite powder; (2) mixing phosphoric acid and aluminum hydroxide, stirring in a water bath to form a uniform gel precursor, adding the MXene-coated PPy composite powder into the precursor, and dispersing to obtain a modified precursor; (3) placing the modified precursor in a microwave reactor for reaction to obtain a product; and (4) carrying out cooling, suction filtration, washing, drying and crushing on the product to obtain the novel wide-layer-distance aluminum dihydrogen phosphate layered material. The method has the characteristic of efficient process design, and is mainly reflected in that the molecular interlayer spacing of the material is effectively widened, the microwave-assisted reaction time is short, the energy consumption is low, and the process is green and environment-friendly.

This invention belongs to the field of heavy metal ion detection technology, specifically relating to a method for detecting Co based on microwave-synthesized histidine carbon quantum dots from yam. 2+ The method involves adding ground yam powder and histidine to deionized water, stirring, and then microwaving. After centrifugation, the supernatant is filtered through a filter membrane, and the filtrate is the yam-doped histidine carbon quantum dot (F-CDs) mother liquor. Different concentration gradients of Co are added to the F-CDs mother liquor. 2+ Subsequently, the fluorescence intensity of the F-CDs mother liquor increased with Co. 2+ The quenching efficiency F / F0 and Co gradually decrease with increasing concentration. 2+ In 1×10 ‑6 ~9×10 ‑6 The method exhibits good linearity within the mol / L concentration range and demonstrates good selectivity, indicating that it is effective for Co. 2+ The detection is characterized by its sensitivity, speed, and high selectivity.

The invention discloses a method for quickly detecting moisture in tobacco leaf processing. 2+ As the precursor material, dimethyl sulfoxide (DMSO) was used as the solvent. Solvent-dependent rhein-based carbon dots were prepared by microwave method. The interaction between water and aprotic solvent DMSO was used to reduce the fluorescence signal of carbon dots. Combined with smartphone RGB signal acquisition technology, a new method with high sensitivity and selectivity for moisture determination was established by using the good linear relationship between moisture content and R value. The detection limit was 5 mg. This method was applied to the detection and analysis of moisture content in tobacco leaf processing, and the results were consistent with those of the reduced pressure drying method. The method is simple, stable and accurate.

The invention belongs to the technical field of supercapacitor electrode material preparation, and discloses a method for preparing a supercapacitor by using nitrogen-doped biomass derived porous carbon composite nickel-cobalt-manganese oxide. According to the method, biomass waste is taken as a raw material, and low-cost and large-scale preparation is realized through an innovative process, namely nitrogen-doped biomass pretreatment, high-temperature carbonization and microwave-method efficient compounding of a metal compound. The method comprises the following specific steps: mixing and soaking biomass and a urea solution, and carrying out urea-assisted soaking to realize nitrogen doping; then carbonizing under the protection of nitrogen, and performing high-temperature carbonization to form a biomass charcoal matrix; and finally, rapidly compounding the biomass charcoal and the nickel-cobalt-manganese oxide through a microwave radiation technology. A green doping and microwave efficient composite strategy is adopted. The process effectively solves the problems of non-uniform doping, complex compounding mode, time consumption and the like in the traditional technology, and provides an innovative solution for preparation of a high-performance supercapacitor electrode material.

The application belongs to the technical field of environmental material synthesis, and particularly relates to a method for synthesizing a composite film by means of NMP-induced surface self-corrosion assisted rapid spin coating and application thereof; the steps are as follows: firstly, PDI and PEDOT are prepared, then a photocatalyst is prepared by means of a microwave method and a surface imprinting technology, and then the photocatalyst is embedded in surface pores of a PVDF film by means of NMP-induced surface self-corrosion assisted rapid spin coating to prepare an imprinting composite film with high stability and high permeability; the imprinting PDI / PEDOT photocatalyst is firmly embedded in the surface pores of the PVDF film, the stability is effectively improved, and a high water flux and a high light degradation activity are maintained. In addition, the construction of a heterojunction structure and the existence of imprinting cavities endow the imprinting composite film with good self-cleaning performance, photocatalytic performance and significant selectivity, and the imprinting composite film has a wide application prospect.

The application provides a preparation method and device of a graphdiyne powder material, and the method comprises the following steps: under the action of microwaves, the graphdiyne powder is prepared through a solution homogeneous system and in combination with a flow continuous growth process. The application realizes the large-batch continuous preparation of the graphdiyne powder under the condition of no substrate by using the microwave method, and overcomes the technical difficulty that the graphdiyne powder is difficult to continuously mass-produce in a homogeneous solution. The reaction time is short, the yield is high, the operation is simple, and the two-dimensional graphdiyne nanosheet with uniform sheet diameter is prepared.

This invention relates to a wear-resistant phase change energy storage material and its preparation method, belonging to the field of energy storage material technology. The invention uses hydrazine hydrate and a hydrothermal method to prepare a mixture of tetragonal zirconium oxide and cerium oxide through complexation, followed by calcination in high-purity oxygen to obtain a CeO2-ZrO2 mixture. This mixture exhibits good wear resistance, resulting in a longer service life for the prepared phase change energy storage material. The invention also prepares modified halloysite nanotubes using a combination of impregnation and microwave methods. Impregnation allows a mixture of graphene and yttrium oxide to be uniformly loaded onto the halloysite nanotubes, forming a composite material. Microwave heating allows for rapid and uniform heating of the sample, enabling better bonding of graphene and yttrium oxide on the halloysite nanotubes and the formation of stable chemical bonds among the three. Furthermore, the invention introduces titanium carbide into the phase change energy storage material, which significantly improves the overall hardness of the material, thereby enhancing its wear resistance.

The invention relates to the technical field of crude oil moisture meters, and discloses a microwave method crude oil moisture meter calibration device and method, the microwave method crude oil moisture meter calibration device comprises a rack and a storage cylinder, the rack is provided with a conveying belt, and the rack is also provided with a determination mechanism, a limiting mechanism and an output mechanism. According to the device, the storage cylinders loaded with crude oil with known water content can be sequentially conveyed, so that a worker can conveniently switch standard samples with high, medium and low water content, and the rapid change of the water content of different crude oil in different sections of a pipeline is simulated; the stability of the storage cylinder can be guaranteed, in addition, during detection, the temperature control module adjusts the temperature of the surrounding environment of the crude oil, the air pump feeds air into the storage cylinder, and the moisture content of the crude oil is detected in different pressure and temperature environments, so that the environment of an oil field site can be simulated, and the detection accuracy is further guaranteed.

The invention relates to a wear-resistant phase change energy storage material and a preparation method thereof, and belongs to the technical field of energy storage materials. According to the preparation method, hydrazine hydrate is adopted, a mixture of tetragonal phase zirconium oxide and cerium oxide is prepared through complexation by using a hydrothermal method, the mixture is roasted in high-purity oxygen, the CeO2-ZrO2 mixture is prepared, and the mixture shows good wear resistance in physical performance, so that the prepared phase change energy storage material has longer service life; according to the preparation method, the modified halloysite nanotube is prepared by combining an impregnation method and a microwave method, a mixture of graphene and yttrium oxide can be uniformly loaded on the halloysite nanotube through the impregnation method to form a composite material, and a sample can be rapidly and uniformly heated through the microwave method, so that graphene and yttrium oxide are better combined on the halloysite nanotube; stable chemical bonds are formed among the three; titanium carbide is further introduced into the phase change energy storage material, the overall hardness of the material can be remarkably improved, and therefore the wear resistance is improved.

The present invention is applied to the field of new energy materials and electrocatalytic water splitting technology. A Ru-doped crystalline / amorphous CoMoOx nanosheet catalyst grown on nickel foam (NF) by a coprecipitation-microwave method is adopted, denoted as a / c-RuCoMoOx / NF. And by adjusting the microwave time, the ratio of the crystalline / amorphous components is controlled, and thus a / c-RuCoMoOx / NF with the best crystalline / amorphous component ratio and rich crystalline / amorphous heterointerfaces is obtained. When this catalyst is used as the working electrode, it exhibits excellent HER and OER activities and stabilities in an electrolyte of 1.0 M KOH. In addition, it also has excellent overall water splitting activity and stability in an electrolytic cell with an electrolyte of 1.0 M KOH. According to the Faraday test, the Faraday efficiency is close to 100%.

The application discloses a sewage plant intelligent sludge discharge and dewatering and dosing control system based on big data analysis, which comprises a big data analysis control platform connected with each water quality and quantity monitoring facility, each sludge pump, each sludge flowmeter, each microwave method sludge concentration meter, the dewatering equipment, the dosing pump and the dosing flowmeter through communication cables; and the big data analysis control platform controls after analyzing and calculating the data obtained from the communication cables. The application establishes a big data analysis control platform of sewage plant mechanism and data fusion, starts from the whole of sludge discharge, dewatering and dosing, accurately and dynamically controls sludge concentration, sludge dewatering and dosing amount, reduces the operation load of the dewatering equipment and the dosing amount, and achieves the effect of intelligent low-carbon operation.

The present invention provides a CDs-loaded MIL-53(Fe)-NO2-type oxide nanozyme and its preparation method and application, which belong to the technical field of carbon-based nanomaterials. The present invention uses MIL-53(Fe)-NO2 as a carrier matrix, and through a one-step microwave method, carbon dots rich in nitrogen and oxygen functional groups are loaded into MIL-53(Fe)-NO2 to obtain CDs@MIL-53(Fe)-NO2-type oxide nanozymes. The preparation process of the present invention is simple and fast, which solves the problem that the existing CDs@MOFs-type oxide nanozymes do not have oxidase-like activity in the absence of external stimulation. The obtained CDs@MIL-53(Fe)-NO2 has excellent oxidase activity in the absence of external stimulation, and can be applied to the fields of biosensing, pharmaceuticals, food, antibacterial, environmental protection, etc., and can be further applied to the fields of bioanalysis and food safety.

The application discloses a method for preparing Li3Fe2(PO4)3 from retired positive electrode powder of lithium iron phosphate battery, which comprises the following steps: mixing the active powder obtained by decomposing the positive electrode sheet with acid or alkali, and then adding an oxidizing agent to react to obtain a mixed solution; putting the mixed solution into a microwave reactor to react to obtain a Li3Fe2(PO4)3 precursor solution; centrifuging the precursor solution and washing it for multiple times, and then putting it into a muffle furnace to calcine after drying, and finally obtaining the powder-shaped Li3Fe2(PO4)3. The application can avoid the use of a large amount of strong acid and strong alkali in the traditional wet method, and can realize a short process, a simple preparation method, low cost, and direct regeneration of lithium battery positive electrode materials. After introducing an external field by the microwave method, the acid and the alkali promote the change of the structure of LiFePO4, and the recovery of lithium and iron elements is facilitated. In addition, after recycling, the application obtains the NASICON type Li3Fe2(PO4)3 with high ionic conductivity and stable structure as a positive electrode material to assemble a lithium ion battery, and it is found that the lithium ion battery has good reversible capacity and excellent capacity retention rate.

This invention provides an antibacterial cotton fiber based on silver-doped carbon quantum dots (Ag-CQDs), its preparation method, and its applications, belonging to the field of functional textile materials technology. This invention employs a microwave method for the rapid synthesis of silver-doped carbon quantum dots (Ag-CQDs). Utilizing the instantaneous high temperature, uniform heating, and electron transfer-promoting properties of microwaves, silver ions rapidly combine with the oxygen- and nitrogen-containing functional groups of the carbon precursor, forming a covalent / coordination composite structure of silver-doped carbon quantum dots. Further chemical modification of the cotton fiber generates numerous active reaction sites on its surface. Finally, Ag-CQDs are firmly loaded onto the cotton fiber surface and surface voids through covalent bonds, coordination bonds, and hydrogen bonds, forming a uniform, continuous, strong, and washable antibacterial coating. The resulting silver-doped carbon quantum dot-based cotton fiber exhibits long-lasting antibacterial properties, along with low toxicity, high stability, and good bonding strength, demonstrating excellent application prospects in the field of long-lasting antibacterial textile materials.

The application discloses a method for detecting glyphosate in coffee by Cu-CDs / ABEI@Ag nanozyme catalytic chemiluminescence, and belongs to the technical field of chemical analysis and detection. 2+ The application is characterized in that 4-aminoantipyrine is used as a precursor, Cu is used as a doping element, Cu-doped carbon dots (Cu-CDs) are synthesized by a microwave method, Cu-CDs and ABEI are used as reducing agents to synthesize Cu-CDs / ABEI@Ag nanozyme, the Cu-CDs / ABEI@Ag nanozyme has excellent peroxidase-like (POD-like) activity, promotes the decomposition of H2O2, and enhances a chemiluminescence signal; glyphosate can interact with the Cu-CDs / ABEI@Ag nanozyme to inhibit the POD-like activity of the nanozyme, so that the chemiluminescence intensity generated by the oxidation of ABEI is reduced; and based on this, the method is used for detecting glyphosate in coffee samples, and has the characteristics of high specificity, simple operation and high sensitivity.

The invention relates to the technical field of nano biological medicine, and discloses a Ce-Cu bimetal MOF nano enzyme prepared based on a microwave method and a preparation method and application thereof.The preparation method comprises the following steps that cupric nitrate trihydrate and pyrazole-4-carboxylic acid are completely dissolved in N, N-dimethylformamide through oscillation dissolution or ultrasonic dissolution, and a solution A is prepared; ultrasonically dispersing the Ce6 cluster in water to prepare a solution B; mixing the solution A with the solution B, and slowly adding trifluoroacetic acid to prepare a mixed solution C; the mixed solution C is placed in a microwave reactor, the reaction temperature ranges from 80 DEG C to 100 DEG C, the microwave power ranges from 300 W to 400 W, and the reaction time ranges from 15 min to 30 min; and centrifuging and washing to obtain the Ce-Cu bimetal MOF nano-enzyme with the particle size of 100 to 200 nm. The reaction is rapid, the morphology is controllable, and the SOD and CAT simulation activity is high.

The invention discloses a method for regulating and controlling hydrogenation selectivity of styrene by double-metal doping, which comprises the following steps: by taking MOF-808 as a model, synthesizing Pt nanoparticles in situ in a pore channel of the MOF-808 as an active center for hydrogenation of phenylacetylene, and replacing a part of Zr clusters of the MOF-808 with two different metals by a two-step microwave method to realize double-metal doping. The activity and the selectivity of phenylacetylene hydrogenation reaction are regulated and controlled under the conditions of normal temperature and normal pressure by adjusting the category and the proportion of bimetal, and finally high-activity conversion of phenylacetylene and high-selectivity product distribution of styrene are realized.

The invention relates to a method for preparing resistant dextrin by using an intermittent microwave technology, which comprises the following steps: (1) adding an acid solution into starch, sealing and uniformly stirring to obtain acidified starch; (2) carrying out intermittent microwave operation on the acidified starch according to different empty-duty ratios to prepare a resistant dextrin crude product; and (3) dissolving the crude product of the resistant dextrin, performing enzymolysis and centrifugation through thermostable alpha-amylase and saccharifying enzyme, performing alcohol precipitation with ethanol, cleaning, and drying to obtain the resistant dextrin. By adopting the intermittent microwave method, the energy loss is reduced, the yield and the purity of the resistant dextrin are improved, and the production cost is saved.

The invention discloses a photo-production microwave method based on a light injection semiconductor laser. An output optical signal of injecting the light in the single-period oscillation state into the semiconductor laser is transmitted through an optical fiber to generate an electric feedback signal, the electric feedback signal is used for performing electro-optical modulation on the injected light, and finally, the output optical signal is subjected to photoelectric detection to obtain a low-noise photo-generated microwave signal; the electric feedback signal generation method comprises the following steps: firstly, converting a transmitted output optical signal into an electric signal and dividing the electric signal into two paths; performing frequency division on the first electric signal to obtain a frequency-divided electric signal; performing feedback control adjustment on the phase of the second path of electric signal by taking the constant phase difference between the frequency division electric signal and a reference signal with the same frequency as a control target; and combining the second path of electric signal after feedback control adjustment with the reference signal into one path to obtain the electric feedback signal. The invention further discloses a photo-generated microwave device based on the light injection semiconductor laser. The frequency spectrum purity and the frequency stability of the signal can be effectively improved.

The invention discloses sisal fiber-based fluorescent carbon dots and a preparation method and application thereof in dye adsorption, and the preparation method comprises the following steps: step 1, adding sisal fibers into a mixed solution composed of sodium hypochlorite, TEMPO, sodium bromide and deionized water, adjusting the pH value to 9-10, reacting at room temperature for 4 hours, then quenching the reaction with ethanol, washing the obtained mixture with tap water to neutralize, and drying to obtain sisal fiber-based fluorescent carbon dots; washing with deionized water, and drying to obtain carboxylated sisal fiber; step 2, taking the carboxylated sisal fibers as a carbon source, adding polyethyleneimine as a nitrogen source, and performing microwave treatment to obtain the sisal fiber-based fluorescent carbon dots. According to the invention, CDs are grown on SF in situ by a simple microwave method, the SF-N-CDs material with high strength, rich functional groups on the surface and high pore structure is obtained, and the adsorption capacity of the SF-N-CDs material on methyl blue dye can be remarkably improved.

The invention relates to a method for synthesizing calcium carbonate by using a microwave method, and a product and application thereof, and the method comprises the following steps: co-dispersing a calcium ion salt aqueous solution, a carbonate ion salt aqueous solution and a surfactant in an organic solvent, carrying out microwave treatment on the mixed solution, centrifuging the treated solution, and harvesting the precipitate, namely the calcium carbonate product. According to the preparation method, the solvation layer structure and the nucleation dynamic process of calcium ions are effectively adjusted by using the organic solvent, the surfactant is introduced to promote the formation of a stable micelle dispersion system between the calcium ions and carbonate ions, and the reaction system is efficiently and uniformly heated by using a microwave radiation technology; microwave field heating can pertinently realize rapid temperature rise in the crystal nucleation process and keep high-energy continuous supply, which plays a key role in promoting rapid formation and oriented growth of crystals. After the calcium carbonate is used as a filler for papermaking, the tensile strength and the air permeability of paper can be remarkably optimized.

The invention discloses a preparation method and application of novel biomass carbon dots. The preparation method comprises the following steps: S1, adding apple branch powder into water, and uniformly mixing to obtain a mixed solution; and S2, putting the mixed solution obtained in S1 into a microwave oven for microwave treatment to obtain a reactant. S3, taking out reactants, cooling the reactants to room temperature, and adding water for centrifugal filtration treatment. And S4, collecting a supernatant obtained by treatment in S3, and purifying the supernatant. And S5, drying the purified product obtained in S4 to obtain the biomass carbon dots, and storing the prepared biomass carbon dots in an environment with a constant temperature of 4 DEG C for later use. Apple branches are used as precursors, the biomass carbon dots are synthesized through a microwave method, biocompatibility is good, toxicity is low, high-selectivity and high-sensitivity detection of Cr < 6 + > and riboflavin can be achieved, the synthesis process is economical, environmentally friendly, rapid, simple and convenient, and a new scheme is provided for the environment-friendly detection technology.