115 results about "Membrane adsorption" patented technology

A membrane absorption method for removing the acidic gas (H2S, organo-sulfur, etc) from the natural gas in oil-gas field by use of micro-pore hollow fiber membrane includes such steps as introducing natural gas to tubular cavity of membrane separator, penetrating H2S to outside of tubular cavity, absorbing it by absorptive liquid, heating the absorptive liquid by heat exchanger, and regenerating the absorptive liquid while releasing H2S, and pumping the H2S into tail gas tank by vacuum pump.

The invention discloses an amine modified fibrous membrane adsorption material and a preparation method thereof and belongs to the field of synthesis and application of environment function materials. Polyacrylonitrile powder is taken as a matrix, a liquid matrix is prepared through solid phase graft polymerization and amination, electrostatic spinning is performed, and the novel fibrous membrane adsorption material is prepared. The synthetic method is simple, the amination efficiency is high, a large quantity of swelling agents and amination reagents can be saved, and the prepared membrane adsorption material has a high hydrophilic surface and can be applied to a flat sheet membrane filtration assembly; when water passes through a fibrous membrane, surface groups can efficiently adsorb and remove multiple heavy metal ions in water, and the fibrous membrane which is saturated after adsorption can be reused after desorption and regeneration.

The invention relates to a preparation method and an application of a polyester nanofiber modified membrane adsorption material. The preparation method of the adsorption material comprises the following steps: adding polyethylene terephthalate spinning solution into electrostatic spinning equipment and preparing a polyester nanofiber membrane by using the electrostatic spinning equipment; and after carrying out low-temperature plasma grafting modification on the obtained polyester nanofiber membrane, performing cleaning and drying to obtain the polyester nanofiber membrane adsorption material. The nanofiber diameter is 200-500 nm before the adsorption material is modified, the nanofiber diameter after modification is increased, and after plasma treatment, if different grafting monomers are used, different nanofiber diameters are obtained. The preparation method of the adsorption material is simple to operate, and the obtained nanofiber membrane has the characteristics of hydrophilcity, low cost, large adsorption quantity, quick adsorption speed and wide raw material source. The adsorption material can efficiently and quickly adsorb heavy metal ions Cu (II).

The invention discloses a rhenium disulfide nanosheet array film adsorption sensor and a preparation method thereof. The sensor comprises an electrode base and a sensitive material. The electrode base is composed of a gold electrode and a ceramic insulating sheet substrate, wherein the gold electrode is an interdigital electrode structure. The sensitive material is a rhenium disulfide nanosheet array film, and is synthesized by chemical vapor deposition method. Through design of the synthetic strategy, the rhenium disulfide nanosheet array film in an orientation perpendicular to the electrode base can be deposited on the electrode base so as to compose the adsorption sensor. The sensor has the characteristics of simple structure, small size, low preparation cost and simple synthesis. Because of the vertical orientation of the nanosheet, more gas molecules can be adsorbed on the surface, thus being beneficial to diffusion of molecules. Therefore, compared with the existing sensors, the sensor provided by the invention has the advantages of high sensitivity, short response recovery time and good accuracy, and is very suitable for popularization and application.

The invention provides a preparation method of a membrane adsorbent for removing ammonia nitrogen in wastewater. The preparation method comprises the following steps: treating modified pure water sludge; adding polyvinylpyrrolidone into a tapered bottle containing dimethyl acetamide; adding polyvinylidene fluoride after uniformly stirring; re-adding pure water sludge after dissolution; after fully stirring, sealing the bottle mouth and leaving the mixture to stand for defoaming to prepare a casting solution, wherein the addition of polyvinylpyrrolidone accounts for 2-4% of the mass of the casting solution, the total mass of polyvinylidene fluoride and sludge particles accounts for 17-20% of the mass of the casting solution, the mass ratio of polyvinylidene fluoride to the sludge particles is (3:7)-(7:3), and the rest is dimethyl acetamide; striking the casting solution on a glass plate to manufacture a flat sheet membrane; then placing the flat sheet membrane in a pure water precipitating bath; soaking in deionized water after film forming, and then taking out; placing the membrane in anhydrous ethyl alcohol to be soaked; taking out the membrane; naturally cooling to obtain the membrane adsorbent. The membrane adsorbent can absorb ammonia nitrogen in water and is renewable.

The invention provides a biomimetic membrane for removing aflatoxins, and a preparation method and treatment method of the biomimetic membrane. The biomimetic membrane comprises a microporous membrane, a dopamine coating coats the microporous membrane, polyethyleneimine is grafted to the dopamine coating, and enzyme molecules are adsorbed onto the polyethyleneimine. The method comprises the following steps of firstly coating the microporous membrane with poly-dopamine, then grafting the polyethyleneimine, and finally adsorbing the enzyme molecules through the polyethyleneimine. Enzymes adsorbed onto the biomimetic membrane can be unceasingly desorbed and released into feed liquid in the process of performing catalytic degradation on the aflatoxins, so that the polyethyleneimine is exposedto continue adsorbing the aflatoxins until a saturated state is obtained, and the total aflatoxins removing rate is greater than 80%. The adsorbed aflatoxins are eluted with aqueous alkali, so that regeneration and repeated use of the biomimetic membrane are realized, and 50% or above of the eluted aflatoxins can be degraded in the aqueous alkali. The preparation technology of the biomimetic membrane disclosed by the invention is simple, enzyme catalysis, enzyme slow release, membrane adsorption and alkali treatment are combined, and the removal rate of the aflatoxins can be increased.

The invention discloses a printing and dyeing wastewater deep treatment method which includes the steps: first, medium filtration; second, magnetic hydrogel micro-sphere adsorption; third, photocatalytic reaction; fourth, electrostatic spinning nanofiber membrane filtration; fifth, ultrafiltration membrane segment. According to the printing and dyeing wastewater deep treatment method, most impurities, organic matters and heavy metal ions are adsorbed by magnetic hydrogel micro-spheres with excellent performances, the organic matters are directly mineralized by a photocatalytic reactor, and most inorganic salts are removed by ultrafiltration membranes through polyvinyl alcohol/chitosan electrostatic spinning nanofiber membrane adsorption. The printing and dyeing wastewater deep treatment method is simple to operate, high in efficiency, free from secondary pollution and low in cost, and the water quality of obtained recycled water meets textile printing and dyeing industrial water standards.

The invention belongs to the field of chemical analysis technology and environmental protection, and provides a polyvinylidene fluoride filter membrane adsorption removal method for removing perfluorinated compounds in environmental water. An adsorption medium provided by the invention is a highly fluorinated polyvinylidene fluoride filter membrane, a sample solution can quickly flow through the adsorption medium due to the large diameter of the adsorption medium, and the adsorption medium has high adsorption capacity and good selectivity on perfluorinated compounds based on the fluorine-fluorine affinity effect, and is especially suitable for enrichment and/or purification of long-chain perfluorinated compounds in environmental water samples. The adsorption medium used in the method doesnot need to be synthesized and is low in price and convenient to operate.

The invention relates to a succinyl-beta-cyclodextrin modified PAN film adsorbing material and a preparation method thereof. The method comprises the following steps: firstly forming a dense polydopamine intermediate layer on a PAN film, wherein the polydopamine intermediate layer contains a large amount of hydrophilic hydroxyl and amino functional groups, and performing dehydration condensation on the amino of the polydopamine intermediate layer and carboxyl of succinyl-beta-cyclodextrin to obtain the succinyl-beta-cyclodextrin modified PAN film adsorbing material. The adsorbing material provided by the invention has good adsorption performance on hexavalent uranium through enveloping action of a hollow cavity of the cyclodextrin and uranium and action of carboxyl of succinyl and the hexavalent uranium, greatly improves the removal efficiency of the hexavalent uranium, and is easy to recover and recycle; and the succinyl-beta-cyclodextrin particles are firmly loaded and not easily disembedded, and have uniform loading, thereby increasing the contact area with pollutants, and improving the treatment efficiency.

The invention discloses a preparation method of an Mxene membrane adsorption material based on polyamidoxime and a uranium extraction method. The method comprises the following steps: treating the raw materials with HF at a certain temperature and under certain conditions; soaking in a DMSO solution, and carrying out ultrasonic suction filtration to form an Mxene membrane; soaking the Mxene membrane in a polyamidoxime solution, carrying out vacuum suction filtration to remove the polyamidoxime solution after soaking is finished, washing with pure water, and then drying to obtain an amidoximation modified Mxene membrane; flatly placing the Mxene membrane on the surface of the upper portion of the sponge, placing the Mxene membrane and the sponge into a uranyl ion solution together under illumination, and enabling the upper portion of the sponge to contact with the Mxene membrane. The method is simple, raw materials are rich, reaction conditions are mild, energy consumption is low, and the prepared material is good in adsorption performance.

The invention discloses a membrane adsorption device and relates to the technical field of automation. Mounting plates are mounted at two ends of a frame, an adsorption support net is mounted at the upper end of the frame, a wind gathering cover is mounted at the lower end of the adsorption support net, a wind gathering barrel is mounted at the lower end of the wind gathering cover, a filter is mounted at the inner upper end of the wind gathering barrel, an adsorption fan is mounted at the lower end of the filter, and a wind outlet filter net is mounted at the lower end of the adsorption fan.The device facilitates rapid adsorption and is convenient to use and simple to operate, the stability can be improved and time can be saved.

The invention discloses a novel method for detecting pathogenic microorganisms. The method comprises: a collection step of samples such as cerebrospinal fluid and alveolar lavage fluid; a collection steps of peripheral blood samples; a DNA extraction step; a library construction step; a sequencing step; and an analysis step. The DNA extraction step comprises: taking 400 [mu]l sample for detection,adding reaction reagents of buffer GB, Lysis Enzyme K, RNA, Carrier to the sample, conducting reaction at 56 DEG C for 10 minutes to obtain a reaction solution, purifying the reaction solution by silica gel membrane adsorption column to remove salt ions and organic reagents, and obtaining DNA with total amount and purity meeting the requirements. The library construction step comprises: conducting terminal repair, linker connection, library amplification and enrichment, purification and quality control of the DNA to complete the library construction. The sequencing step comprises: denaturingthe library into a single strand by NaOH, then binding the library to a sequencing chip, enriching each single strand DNA into a cluster by bridge amplification, and obtaining sequencing data by usingIllumina SBS sequencing method to read the sequence. The analysis step comprises: filtering the sequencing data, removing the human source and the linker sequence, and comparing the remaining data with a microbial reference database.

The invention discloses a biological detection chip. The biological detection chip comprises a substrate, a metal array layer and a film adsorption layer which are stacked, wherein the metal array layer is positioned on the substrate and is provided with a spacing region for exposing the substrate; the film adsorption layer wraps the metal array layer and the surface of the substrate located in the spacing region, and the film adsorption layer is provided with a hydrophilic surface. Cells and organelles with biological film structures can be adsorbed by utilizing the hydrophilic surface of thefilm adsorption layer, target biomolecules are loaded on a biological film, the surface enhanced infrared absorption spectrum of the target biomolecules can be obtained, and detection and analysis ofthe target molecules are realized. The invention discloses a biosensor, which comprises the biological detection chip, is suitable for detecting film surface biomolecules with complex types, does notdestroy the molecular structure, and is suitable for research of various physiological and pathological processes, drug screening diagnosis and the like. The invention discloses a preparation methodof a biological detection chip, which is simple in preparation process and suitable for preparing the chip for detecting the biomolecules on the surfaces of various films.