358results about How to "Easy to desorb" patented technology

The invention discloses a mycotoxin detoxification agent for feed and a preparation method and a feed additive thereof, and belongs to the field of feed additives. The mycotoxin detoxification agent can be used for detoxification of feed raw materials and compound feed of mycotoxin polluted corn, grains and the like. The mycotoxin detoxification agent consists of modified montmorillonite, yeast cell wall, chitosan and the like; and the preparation method has simple process. The novel mycotoxin detoxification agent for feed can effectively remove pollution of multiple mycotoxins such as aflatoxin, zearalenone, T2 toxin, vomitoxin and the like in the feed raw materials and the feed of the corn, the grains and the like, and prevent various diseases of livestock and poultry because of eating the mycotoxin polluted feed. The mycotoxin detoxification agent has simple preparation process, stable and controllable quality, convenience in use and low price, meanwhile has the advantages of supplementing nutrients, improving the disease resistance of cultured animal bodies and avoiding adsorbing nutrient elements in the feed, and guarantees the health and safety of the cultured animals.

The invention discloses a method for separating oily sludge and sands, which comprises the steps of: in the presence of water, carrying out a contact reaction on the oily sludge and sands and a catalyst and an oxidizing agent, and separating to obtain a water phase, a grease phase and sand, wherein the oxidizing agent is a matter capable of oxidizing grease in the oily sludge and sands and reducing the viscosity of the oily sludge and sands, and the catalyst is a matter capable of promoting the oxidizing agent to generate radicals with strong oxidability. According to the method for separating the oily sludge and sands, provided by the invention, the content of oil in oily sludge and sands can be remarkably reduced, therefore, grease, sand and water in oily sludge and sands can be effectively and efficiently separated.

The invention provides a magnetic mesoporous silica gel material extracting agent used for enriching and/or separating trace organic pollutants in an environment water sample, and a preparation method thereof. A core of the extracting agent provided by the invention is a silicon gel microsphere (i.e. magnetic silicon gel microsphere) wrapped with a plurality of Fe3O4 magnetic nano particles, and a shell of the extracting agent is a mesoporous silicon gel shell layer with inner and outer surfaces modified by C18 silanization. The extracting agent integrates huge special surface area, excellent extracting capacity and ultrahigh extracting volume of a mesoporous material, magnetic separating capacity of a magnetic material, strong extracting capacity of C18 groups and special volume exclusion function of a vertical channel of the mesoporous material. In addition, the extracting agent provided by the invention has the advantages of high extracting efficiency, low preparation cost and simple preparation method, and is very suitable for preprocessing samples of the trace organic pollutants in a bulk-mass water sample.

The invention discloses a preparation method of an alkali oxygen evolution reaction electrocatalyst. The preparation method comprises the following steps: firstly, carrying out ultrasonic cleaning on a conductive substrate, then preparing aqueous solution with soluble cobalt salt, soluble manganese salt, ammonium fluoride and urea, and in a reaction kettle, vertically growing a manganese cobalt subcarbonate nano array multilevel structure on the surface of the substrate; then preparing aqueous solution with soluble alkali and a reducing agent, carrying out secondary treatment, and carrying out structure and performance optimization on the manganese cobalt subcarbonate nano array multilevel structure; finally, in a tube furnace, in nitrogen or argon atmosphere, carrying out calcination at a temperature of 200 to 1,000 DEG C to prepare the alkali oxygen evolution reaction electrocatalyst with a manganese-doped cobalt oxide nano array multilevel structure. The preparation method disclosed by the invention adopts a simple hydro-thermal synthesis/calcination treatment method, is simple in process and is easy to regulate and control; the prepared product is excellent in performance and is an electrocatalyst with wide prospect in the application process of alkali water decomposition.

The invention relates to a solid phase extraction column based on graphene bonded silica gel, which is used in concentration and separation of organic pollutants in an environmental water sample. A graphene bonded silica gel padding is prepared by taking 3-aminopropyl triethoxy silane (APTES) as the cross-linking agent; then graphene is bonded on the surface of silica gel; after product graphene bonded silica gel granules are evenly filled in a solid phase extraction column, the graphene bonded silica gel based solid phase extraction column is obtained. The performance indicators of the solid phase extraction column are tested through polycyclic aromatic hydrocarbons, including naphthalene, acenaphthylene, fluorene, phenanthrene, fluoranthene and pyrene, and the test result shows that the solid phase extraction column has good extraction efficiency, reproducibility and stability. The graphene bonded silica gel has the characteristics of big specific surface area, strong Pi electron adsorption ability and high extraction capacity of the graphene, and the stable mechanical property and good adsorption ability of the silica gel. Moreover, the solid phase extraction column based on the graphene bonded silica gel is low in preparation cost and simple to operate and is suitable to be used for pretreatment of low-concentration organic pollutants in a big-volume water sample. The solid phase extraction column has a good application prospect in the concentration and separation of environmental organic pollutants.

The invention provides a method for treating ammonia nitrogen wastewater, which relates to a method for treating the ammonia nitrogen wastewater by using an adsorption method. The method is characterized in that in the treating process, a natural manganese mineral is used as an adsorbent to perform adsorption reaction with the ammonia nitrogen wastewater so as to remove the ammonia nitrogen in thewastewater. The natural manganese mineral is crushed into a manganese mineral adsorbent of 0-2 millimeters, the pH value of the wastewater containing the ammonia nitrogen is adjusted to be between 2and 12 by using acid or alkali, then the manganese mineral adsorbent contacts and is mixed with the ammonia nitrogen wastewater to perform adsorption, and the adsorption can be performed by adopting afixed bed adsorption column or in a stirring and mixing mode. When the fixed bed adsorption column is adopted for adsorption, the manganese mineral after being crushed is classified to remove fine particles for the best so as to improve the permeability of the adsorption column; and in the same way, when the stirring and mixing mode is adopted, the manganese mineral after being crushed is classified to remove coarse particles for the best so as to reduce the abrasion to equipment. The natural manganese mineral applicable to the method comprises a terrestrial manganese oxide mineral, an oceanpolymetallic nodule, an ocean cobalt-rich incrustation and a terrestrial manganese nodule, the natural manganese minerals usually contain manganese minerals of cryptomelane, todorokite, birnessite, vernadite, rancieite, pyrolusite and the like, have good pore structure and large specific surface area so as to have good adsorption property, and can be used as the adsorbent for treating the ammonianitrogen wastewater after being crushed into certain particle size, and the manganese minerals have the advantages of simple process, easy reproduction and stable performance.

The invention provides a preparation method of an adsorbent for removal of lead ions, cadmium ions, manganese ions, copper ions and other heavy metal ions in wastewater. The method is as follows: first using graphite powder as a raw material to prepare graphene oxide by concentrated sulfuric acid, potassium permanganate and hydrogen peroxide oxidation, dissolving the graphene oxide in ethanol to disperse the graphene oxide in the ethanol by means of ultrasonic, then adding a certain amount of an ammonia-functional-group-containing linear molecule, reacting in water bath at 50-80 DEG C for 12-24 hours, performing vacuum suction filtration of an obtained product, then washing with the ethanol, and then drying at 50-100 DEG C to obtain the heavy metal adsorption material. SEM (scanning electron microscope) pictures show that the adsorbent has a loose surface, and the adsorbent has a good application prospect in adsorption field. Adsorption experiments show that, under the condition of normal temperature, the adsorbent has a good adsorption capacity to the lead ions, cadmium ions, manganese ions and copper ions, and especially has a strong adsorption capacity to the lead ions, and the maximum adsorption amount can reach 370mg/g above.

The invention discloses a gas separation method using sub-pressure swing adsorption, wherein the method comprises pretreatment, negative pressure adsorption concentration, refinement, and recovery removal. According to the present invention, based on pressure swing adsorption, different material components have different adsorption separation coefficients and different physicochemical properties under a negative pressure, adsorption is performed under the negative pressure, evacuation or rinsing desorption is performed, and various separation methods are coupled, such that various mixed gasesare separated and purified through the circulation operation of the pressure swing adsorption process, and particularly the relatively easily adsorbed (and relatively difficultly desorbed) component is separated and purified, wherein the adsorption and the desorption in the circulation are easily matched and balanced; the generated non-adsorbed gas is the intermediate gas, or is the product gas and the qualified discharge gas, or enters the subsequent refining process so as to be refined to obtain the product gas or the qualified discharge gas; and the generated desorbed gas is the condensed gas, and sequentially enters the subsequent recovery removal process so as to further recover or remove the adsorbate component.

The invention discloses a method for preparing a novel high-efficiency heavy metal ion sorbent-carbonic hydroxyl apatite: washing egg shells, drying, and crushing them into below 30 meshes, adding egg shell powder into phosphoric acid in the molar ratio of 1 to 1, calculated by CaCO3, controlling pH value at 1-3, controlling temperature at 30-40 deg.C, and reacting for 2-3 hours, where reaction equation: CaCO3+H3PO4=CaHPO4+CO2+H2O, filtering out nonsoluble matters, adding in urea and Ca(OH)2 powder in the molar ratio of 1 to 1, regulating the pH value to 9-12 with 1mol/L NaOH solution, preserving heat at 50-60 deg.C for 24 h, where chemical reaction formula: CaHPO4+(NH2)2CO+Ca(OH)2-Ca10{(PO4)6-x,(CO3 OH)x}(OH)2, cooling reaction product, and then washing with 1% NH4Cl solution to neutral, drying at 60 degrees centigrade, crushing and obtaining carbonic hydroxyl apatite powder.

The invention discloses a compound heavy metal adsorbent. The compound soil heavy metal adsorbent comprises a floating core and a compound high molecule coating the floating core, wherein the mass ratio of the floating core to the compound high molecule is (1-5):1; the compound high molecule comprises a first polymer and a second polymer of which the mass ratio is (5:1)-(1:5); the first polymer is alginic acid or calcium alginate; the second polymer is modified chitosan; a modification group of the modified chitosan is small molecule chelator; the small molecule chelator has a carboxyl group and at least two chelation groups; the amino group ratio of the small molecule chelator substituted chitosan is above 30%; and the remaining amino groups in the chitosan and hydroxyl groups of the first polymer are crosslinked through dialdehyde molecules. According to the invention, the soil heavy metal adsorbent is prepared by compounding the modified chitosan modified with the small molecule chelator with the alginic acid/calcium alginate and the floating core, thereby improving the adsorbability of the soil heavy metal adsorbent.

The invention provides a magnetic nano material solid phase extracting agent used for absorbing phthalate organic pollutants in an environmental water sample and a preparation method of the extracting agent. The magnetic nano material solid phase extracting agent comprises magnetic silicon dioxide particles serving as the inner core and layered bi-metal hydroxide serving as the shell layer, wherein the magnetic silicon dioxide particles are formed by coating a magnetic nano core with silicon dioxide; and the layered bi-metal hydroxide shell layer adopts Mg-Al bi-metal hydroxide. The preparation method for the solid phase extraction absorbent is simple, the raw material cost is low, a designed extraction process is fast and convenient, a small quantity of organic solvent is required to be used in the whole process, and environment friendliness is achieved.

The invention belongs to the field of catalytic materials, and particularly relates to a three-dimensional graphene/ carbon nano tube based molybdenum disulfide/cobaltous sulfide composite material electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: step I, treating a precursor: performing ultrasonic treatment on a certainamount of oxidized graphene and a modified carbon nano tube, adding ascorbic acid, thiourea and a metal ion precursor to be uniformly mixed, wherein the metal ion precursor is sodium molybdate and cobalt chloride; step II, performing a hydrothermal reaction process: transferring mixed composite into a reaction kettle, heating the composite to a temperature of 160-200 DEG C, reacting for 20-28 hours at the temperature, conducting cooling to the room temperature to obtain a gel-like black substance, and conducting washing and freeze-drying to obtain a cylindrical black solid. A graphene/ carbonnano tube with a three-dimensional network structure provides a quick electron transfer path and an ion transport channel, and molybdenum disulfide/cobaltous sulfide with a nano structure is anchoredon three-dimensional structural carbon to expose more electro-active sites, so that electrochemical hydrogen evolution property is cooperatively improved.

The invention discloses a method for deeply removing molybdenum from a tungstate solution through an ion exchange process. According to the method, multi-amine weak basic anion exchange resin is employed for selectively adsorbing and removing thiomolybdate anion from the tungstate solution subjected to sulfur substitution. The method is good in molybdenum removal effect and easy for desorption, the desorption process does not need adding an oxidant, and the service life of resin is substantially prolonged. Also the method is short in flow, simple in operation and low in cost, and is easy for industrialized application.

The invention discloses a method for the preparation of menthone. A palladium-ruthenium catalyst is used for heterogeneous catalysis under mild conditions, and isopulegol is used for the preparation of the menthone. The palladium-ruthenium catalyst can be used for efficiently catalyzing the isopulegol and making the isopulegol convert into menthone under the mild conditions.

The invention relates to an acrolein oxidation to acrylic acid catalyst, a preparation method and an application of the catalyst, which mainly solve the problems of lower selectivity and yield of acrylic acid in the prior art. The problems are better solved by adopting the technical scheme that the catalyst takes at least one of SiO2, Al2O3 or TiO2 as a carrier and comprises an active component expressed by the following general formula: Mo12VaCuXcYdZeOx, wherein X is at least one of W, Cr, Sn or Nb, Y is at least one of Fe, Bi, Co, Ni, Sb, Ce, La, Zr or Sr, and Z is at least one of alkali metal or alkaline-earth metal, and the catalyst can be used for industrial production of acrylic acid through acrolein oxidation.

The invention discloses a brand-new silica gel and carbon material-compounded VOCs (Volatile Organic Compounds) adsorption material and application thereof to adsorption of VOCs. According to the adsorbent, rigid porous silica gel with high specific surface area is used as a bone glue material, and a macromolecular polymer and a biomass are used as carbon sources; the bone glue material and the carbon sources are introduced into a silica gel channel, and polymerization and high-temperature carbonization are initiated under a hydrothermal environment. Therefore, the brand-new carbon-silicon composite adsorption material is obtained. The adsorbent has hydrophobicity and high-selectivity adsorption capacity for organic molecules, is extremely high in heat resistance and excellent in desorption property, can be applied to a high-concentration organic waste gas recycling technology in the industry, and can also be applied to a VOCs rotating wheel adsorption device and indoor organic waste gas purification.

The present invention relates to a honeycomb active carbon supported catalyst plate, wherein honeycomb active carbon is adopted to support a catalyst, the catalyst support material selects aluminum honeycomb, 2-5 layers of the active carbon with characteristics of porous surface and large specific surface area are sprayed on the aluminum honeycomb surface so as to increase the contact area of the ultraviolet light, the reaction gas and the catalyst, then 2-5 layers of the catalyst are sprayed, and the catalyst loading amount is 1-40%. The catalyst has effects of effective photo-induced electron and hole compounding inhibition, photo-induced electron and hole service life prolonging, and catalytic oxidation efficiency improving, and further has advantages of simple manufacturing method, large specific surface area, good catalyst dispersion, run-off resistance, and the like.

The invention discloses a method for treating mercury-containing wastewater by using modified blue-green algae. The method is characterized by comprising the following steps: (1) performing acidification modification treatment on blue-green algae, thus obtaining modified blue-green algae; (2) treating the wastewater by employing the modified blue-green algae; (3) detecting the supernatant fluid of the wastewater, and discharging the wastewater after qualification; and (4) recovering the blue-green algae, namely filtering the used modified blue-green algae, desorbing the blue-green algae in a desorbing agent for 1 hour, and filtering and refrigerating the modified blue-green algae. The modified blue-green algae raw materials used in the method come from eutrophic lakes and are easily obtained, mass propagation or dead algae in the lakes are reasonably utilized, the eutrophication phenomena can be reduced, and the treatment difficulty of the lake eutrophication is lightened; and moreover, the method for adsorbing and removing the mercury-containing industrial wastewater by utilizing the modified blue-green algae is simple in process and convenient to use.

The invention relates to a zero emission process of vanadium extraction wastewater. By adopting the zero emission process, the residual vanadium and chromium in vanadium extraction wastewater can be effectively recycled, the salts of the wastewater can also be recycled, the energy consumption is low, the technological operation is simple, the vanadium extraction tail washings can be completed returned and recycled, the zero emission of wastewater can be realized and the treatment problem of the vanadium extraction wastewater can be completely solved. The process is characterized in that D301 resin is used as adsorbing medium to adsorb vanadium ions and chromium ions.

The present invention relates to a method and apparatus used for measuring the absorbing amount of an organic solvent volatile gas in an ionic liquid. Said apparatus comprises an evaporator used for a natural evaporation of an organic solvent and an absorber used for adsorbing natural volatile gases of a variety of organic solvents utilizing an ionic liquid as an absorbing agent to achieve the intention that an ionic liquid is used as an absorbing agent to remove organic solvents in industrial waste gas. A weighing method is utilized to perform detections, then the transient absorbing capacity and saturated absorbing capacity of an organic volatile gas in an ionic liquid are got through the mass difference after and before the absorption by the absorbing agent. The channel valve adopts a rotary switch type valve, which is capable of both increasing the flux and decreasing the valve weight at the same time to ensure the weighing precision. The absorber is equipped with a magnetic stirring therein and the adsorbing process is a deep absorption.

The invention discloses a method for separating molybdenum from a tungstate solution through ion exchange. The method includes the steps that trithiocyanuric acid is added into the molybdenum-containing tungstate solution to carry out vulcanization reaction, so that a tungstate solution containing thiomolybdate is obtained; the tungstate solution containing the thiomolybdate is subjected to ion exchange by adopting weak-base anion-exchange resin so as to adsorb the thiomolybdate, and a tungstate solution is obtained; and the weak-base anion-exchange resin loaded with the thiomolybdate is desorbed by an alkaline desorption solution, so that a molybdate solution is obtained. According to the method, the separating effect of molybdenum in the high-tungsten low-molybdenum solution is good, tungsten loss is little, operation is simple, no hydrogen sulfide is released in the vulcanization process, a hydrogen sulfide recovery facility is not needed, no oxidant is used in the desorption process, molybdenum is easy to recover, the service life of the resin is prolonged, and industrial application is facilitated.