46results about How to "Oxygen-rich functional groups" patented technology

The invention discloses a method for preparing a graphene oxide. The method comprises the following steps of: a) adding concentrated inorganic acid into a sealed reactor, adding graphite powder with stirring, reducing the temperature to the temperature of between 0 and 4 DEG C, and adding potassium permanganate to react for 0.5 to 2 hours; b) heating the obtained reaction system to the temperature of between 60 and 70 DEG C, and standing for 12 to 24 hours; c) adding hydrogen peroxide into distilled water in a volume ratio of 1:10, freezing to obtain ice, transferring the graphite oxide to the distilled water containing the hydrogen peroxide until the ice is completely dissolved, uniformly stirring, performing suction filtration, washing and drying to obtain the graphene oxide. The graphite powder, the concentrated acid and the potassium permanganate serve as raw materials, and the raw materials are low in cost and readily available; NO, NO2 and other toxic gases are prevented from being produced; the reaction temperature is as low as 60-70 DEG C; and the product has high dye adsorption capacity and high industrial application value.

The invention discloses a modified magnetic sludge biological carbon and a preparation method and applications thereof. The modified magnetic sludge biological carbon is prepared by carbonizing residual sludge, modifying sludge by alkali, and modifying sludge by acid. The provided modified magnetic sludge biological carbon has the advantages of good magnetic property, large specific surface and pore volume, abundant pore structure, many surface adsorption functional groups and adsorption sites, and strong performance on removing target pollutants; and the preparation method has the advantages of simple preparation, easy operation, low cost, high production efficiency, and convenience for large scale production. The provided modified magnetic sludge biological carbon is used to remove tetracycline hydrochloride in water for the first time, has the advantages of large adsorption amount, strong adsorption performance, high adsorption efficiency, simple and convenient operation, short processing period, low processing cost, and easy separation and recovery, and has a strong performance on removing tetracycline hydrochloride. The maximal balance adsorption amount can reach 253.8 mg / g. The performance of the biological carbon is obviously stronger than that of unmodified magnetic sludge biological carbon.

The invention provides a preparation method and application of an adsorbent. The preparation method comprises the following steps: grafting amido to the tail end of cyclodextrin, and then adding the cyclodextrin and polyacrylic acid to a graphene oxide dispersion liquid for reaction; preparing a surface grafting graphene oxide nanocomposite material through a one-step method, wherein the surface grafting graphene oxide nanocomposite material can fast and effectively treat dye wastewater and especially absorb methylene blue. The adsorbent prepared through the method provided by the invention has the advantages of property of forming clathration with a dye molecule by sufficiently utilizing a cyclodextrin molecule, large specific area of a nanometer material and a high-molecular material, abundance of oxygen-containing functional groups, good water solubility of the high-molecular material, abundance of hydroxy and carboxyl and the like and is capable of fast and effectively treating the dye wastewater by generating electrostatic attraction effect with a cationic dye by concentrating functional group carboxyl on the surfaces of the nanometer material and the high-molecular material; and the adsorbent prepared through the method provided by the invention is capable of fast and effectively treating the dye wastewater because the functional groups, namely the hydroxy, the carboxyl and the like, easily form hydrogen bonds with a water molecule.

The invention provides a preparation method of a graphite oxide acetylene nanosheet achieving water photolysis oxygen generation under visible light. The method for preparing the graphite oxide acetylene nanosheet is simple, efficient and low in cost. The prepared graphite oxide acetylene nanosheet has abundant oxygen-containing functional groups on the surface and excellent dispersion in water, and is beneficial to improvement of light absorption; the graphite oxide acetylene nanosheet has the uniform size and ultra-thin thickness, and is beneficial to separation and transmission of photo-induced electrons and holes, and the performance of water pohotolysis oxygen generation under the visible light is improved. The prepared graphite oxide acetylene nanosheet material has good absorption in the visible light range, and the energy band structure meets the requirement of catalyzing water for decomposition to generate oxygen under visible light irradiation, and thus high-performance visible light water pohotolysis oxygen generation is achieved. In addition, the graphite oxide acetylene nanosheet material still show the excellent water pohotolysis oxygen generation performance under irradiation of near-infrared light (lambda=660 nm).

The invention provides a preparation method and an application of graphitized carbon with a large specific surface area. The preparation method comprises the following steps: loading a metal catalyston a carbon source precursor; and then loading potassium hydroxide, isolating air and raising the temperature for treatment, or putting the carbon source precursor loaded with the metal catalyst intoan atmosphere containing water vapor or carbon dioxide, raising the temperature for treatment, cooling the product, washing the product with acid and water, removing impurities such as silicon, the metal catalyst and alkali, and drying the product to obtain graphitized carbon with a large specific surface area. According to the preparation method, cheap and easily available metal salt is used as acatalyst precursor, and in the catalytic graphitization process, due to the existence of pore-forming agents such as potassium hydroxide, water vapor or carbon dioxide, graphitized carbon with a large specific surface area can be obtained. The graphitized carbon has strong hydrophobicity and strong affinity to organic matters, and can be used for efficiently adsorbing and removing organic pollutants and heavy metals in waste gas or wastewater, and meanwhile, the derivative graphene oxide can be used for efficiently adsorbing and removing heavy metals in water.

The invention relates to a technology for preparing high oxygenous functional group activated carbon through a phosphate activation method. The technology comprises the following steps of: mixing lotus stem powder with phosphate powder according to different mass ratios, soaking at room temperature for 6-12 hours, putting the soaked sample into a muffle furnace, carbonizing and activating for 40-60 minutes at the temperature of 450 DEG C-550 DEG C, cooling, cleaning with deionized water and drying. The preparation technology is simple and has high activated carbon yield; and the activated carbon has developed pores, is rich in nitrogenous functional group, has strong absorption property and can effectively remove harmful pollutants.

The invention relates to a preparation method and application of a sodium-ion battery cathode material, namely a coal-based graphite microcrystal conductive compound. According to the preparation method, first, graphite oxide microcrystals are prepared from a coal-based material; second, the prepared graphite oxide microcrystals and a conductive carbon material are made into a uniformly-mixed mixed solution; third, the mixed solution is made into graphite oxide microcrystal / conductive carbon material composite gel; and last, the graphite oxide microcrystal / conductive carbon material compositegel is calcined in an inert atmosphere, so that the coal-based graphite microcrystal conductive compound is obtained. The graphite microcrystal compound prepared through the method has excellent conductivity; and when the compound is used as the sodium-ion battery cathode material, the compound shows excellent rate capability and circulation performance through electrochemical performance assessment.

The invention relates to biochar, in particular to modified biochar and a method for repairing heavy metal pollution of soil by using the modified biochar. The modified biochar is prepared by the following method: S1, air-drying corn straws; s2, crushing the corn straws to obtain straw powder; s3, adding water into the straw powder, and stirring until the water content of the straw powder is 20-30%; s4, feeding the straw powder into a carbonization furnace, and closing the carbonization furnace; s5, introducing carbon dioxide gas, and emptying air in the carbonization furnace; s6, increasing the temperature to 100 DEG C, and performing heat preservation for 15-30 min; s7, increasing the temperature to the carbonization temperature, wherein the carbonization temperature ranges from 680 DEG C to 750 DEG C, the carbonization time ranges from 1 h to 2 h, and obtaining the modified biochar; s8, cooling to room temperature after carbonization is finished; and S9, heating the modified biochar into a ball mill, and grinding to obtain the modified biochar powder with the particle size of 10-20nm. The modified biochar has larger specific area and pore volume, richer oxygen-containing functional groups and stronger pollutant adsorption capacity.

The invention provides a domestic wastewater treatment method. The method includes the following steps of S1, filtering domestic wastewater to remove large-grained impurities, and adding sodium polyacrylate, polyepoxysuccinic acid, sodium lignin sulfonate and solid biological activated carbon to the filtered wastewater to be stirred and then heated by microwaves; S2, adding a Fenton reagent for oxidization degradation after adjusting pH to be 6-9; S3, adding a modified composite flocculant to the wastewater; S4, making the wastewater processed in the step S5 to pass through a composite filtering layer at the flowing speed of 1.4-6.0 m / min, wherein the composite filtering layer is of a three-layer structure, the upper layer and the lower layer of the composite filtering layer are carbonizedmicron wood wool layers, and the middle layer of the composite filtering layer is made of micro-nano activated wood powder. The domestic wastewater treatment method has great wastewater treatment capacity.

The invention relates to the field of quantum dot preparation, and discloses a preparation method of a graphene quantum dot. The method is characterized in that graphene undergoes an oxidation reaction in an oxidizing solution under an oxidation reaction condition to obtain the graphene quantum dot, wherein the oxidizing solution contains H2SO4 and HNO3, the concentration of H2SO4 in the oxidizingsolution is 10-14 mol / L, and a molar ratio of H2SO4 to HNO3 is 1:(0.20-0.45). The graphene quantum dot obtained by the preparation method has a uniform oxygen-to-carbon ratio and spectrally controllable properties, and is suitable for bioimaging, multicolor labeling and construction of fluorescent and electrochemiluminescent biosensors.

The invention relates to a magnetic biomimetic catalyst and a preparation method and an application method thereof. The preparation method adopts the technical scheme that the preparation method comprises the following steps of uniformly mixing coal-based carbon and a KOH (potassium hydroxide) solution, and treating for 1 to 2h under the vacuum atmosphere at the temperature of 105 DEG C; putting into a microwave generation device, and activating at the temperature of 300 to 700 DEG C; cooling, adding deoxidizing and deionizing water, stirring, standing, and obtaining an upper KOH recycling liquid and a lower precipitate; washing the lower precipitate, and drying, so as to obtain the modified coal-based carbon; uniformly mixing FeSO4.7H2O (ferrous sulfate), the modified coal-based carbon and the deoxidizing and deionizing water, so as to obtain suspension liquid; uniformly mixing NaNO3 (sodium nitrate), NaOH (sodium hydroxide) and the deoxidizing and deionizing water, dripping into the suspension liquid, stirring, and standing; washing the lower magnetic precipitate to neutral state, and drying, so as to obtain the magnetic biomimetic catalyst; uniformly mixing the magnetic biomimetic catalyst and organic wastewater, adding H2O2 (hydrogen peroxide), stirring, and treating, so that the COD (chemical oxygen demand) and chroma of the organic wastewater can reach the national industrial regeneration water quality standard. The preparation method has the characteristics that the technology is simple, the operability is high, the cost is low, the yield is high, and the environment-friendly effect is realized.

The invention relates to the technical field of modified cement, and particularly discloses a preparation method of graphene modified cement and a product thereof. The preparation method of the graphene modified cement comprises the following steps of: preparing polyurethane modified graphene from graphene oxide; preparing a polyethylene glycol / titanium dioxide / polyurethane modified graphene composite material by putting polyethylene glycol, tetrabutyl titanate and the prepared polyurethane modified graphene into a solution; dissolving the prepared polyethylene glycol / titanium dioxide / polyurethane modified graphene composite material in water to obtain modified graphene dispersion liquid, and mixing the modified graphene dispersion liquid with cement to obtain the graphene modified cement.The polyurethane graphene oxide is prepared by performing polyurethane modification on the graphene oxide, the dispersing performance of the polyurethane graphene oxide in cement is improved, and then the composite material is prepared by further combining polyethylene glycol and titanium dioxide, so that the stability of the polyurethane graphene oxide in the modified cement is further improved;therefore, the technical purpose of improving the performance of the cement in all aspects by adding the graphene is achieved.

The invention belongs to the technical field of composite materials, and particularly relates to a hydrothermal carbon-based composite material and preparation and application thereof. Biomass is mixed with a precursor solution of a metal organic skeleton material to obtain raw material mixed liquid; the raw material mixed liquid is subject to a hydrothermal reaction in a closed reactor, and carbonization of the biomass and a crystallization reaction of the metal organic skeleton material are conducted in the process of the hydrothermal reaction; and after the hydrothermal reaction is completed, solid-liquid separation is conducted, and an obtained solid material is cleaned and dried to obtain the hydrothermal carbon-based composite material. Through a metal organic skeleton precursor is added during the preparation of hydrothermal carbon, the hydrothermal carbon and a metal organic framework are organically combined to obtain the hydrothermal carbon-based composite material, the adsorption capacity of the hydrothermal carbon-based composite material to heavy metals is improved, so as to solve the technical problems that hydrothermal carbon-based composite materials in existing technology are not prone to being obtained and the adsorption effect is not good.