112results about How to "Many times of reuse" patented technology

The invention relates to a preparation method of a magnetic chitosan composite microsphere adsorbent, which belongs to the technical field of environmental material preparation. The preparation method comprises the following steps: firstly with FeCl3. 6H2O and FeCl2.4H2O as raw materials, preparing nano Fe3O4 by a coprecipitation process; and secondly, with glutaraldehyde as a crosslinking agent and Fe3O4, kaolin and chitosan as raw materials, synthesizing the novel magnetic chitosan composite microsphere adsorbent by an emulsification crosslinking process. The magnetic chitosan composite microsphere adsorbent is used for separating ciprofloxacin hydrochloride out of a water environment. The adsorption performance and the dynamic performance of the prepared adsorbent are researched in a static adsorption experiment. The results show that the novel magnetic chitosan composite microsphere adsorbent obtained by the method has a rapid adsorption dynamics characteristic, a high adsorption capacity and high magnetic-separation efficiency.

The invention relates to a preparation method for a novel magnetic chitosan composite microsphere antibiotic adsorbent, belonging to the technical field of preparing environment materials. The preparation method comprises the following steps: by taking FeCl3.6H2O, FeCl2.4H2O and halloysite nanotubes HNTs as raw materials, preparing Fe3O4/HNTs compound through co-precipitation, then by taking glutaraldehyde as a crosslinking agent and Fe3O4/HNTs compound and chitosan as raw materials, synthesizing the magnetic chitosan composite microsphere adsorbent by adopting an emulsification crosslinking method, and separating tetracycline (TC) in water environment. The static adsorption experiments are used for researching the adsorption balance and dynamics performance of the prepared adsorbent. Results show that the obtained novel magnetic chitosan composite microsphere antibiotic adsorbent has fast adsorption dynamics property, high adsorption capacity and high magnetic separation capability.

The invention discloses an inner-support-free double-wall locking mouth steel bushing box cofferdam construction method and an inner-support-free double-wall locking mouth steel bushing box cofferdam. Firstly, unit blocks are processed in a factory and then transported to a construction region to be spliced and formed piece by piece, the spliced unit blocks are wholly hoisted to a target pier position at the preset elevation through a large hoisting ship, then construction steps of sludge suction, tenon type locking mouth plugging, sand cushion layer filling, concrete bottom sealing, water suction, foundation clearing, steel protection barrel cutting, pile head removing, whole abutment installation and the like are performed, finally whole dismantling is performed for usage of the next pier position construction. The inner-support-free double-wall locking mouth steel bushing box cofferdam comprises a side plate, a blade foot and a joint and is characterized in that the cofferdam is of a detachable structure, a plane is partitioned into blocks, the blocks are connected in a mode that tenon type locking mouths are combined with bolts, and the inner side is not provided with an inner support. Therefore, the inner-support-free double-wall locking mouth steel bushing box cofferdam has the advantages of being small in construction difficulty, short in construction period, low in cost input, small in material consumption, high in repeated usage times, capable of being wholly recycled, safe, reliable and the like.

The invention relates to a preparation method of an arteannuin molecularly imprinted composite membrane, belonging to the technical field of environmental material preparation. The method comprises the following steps: by using a regenerated cellulose membrane as a substrate, the arteannuin as a template molecule, acrylamide (AM) as a functional monomer and ethylene glycol dimethyl acrylate (EGDMA) as a crosslinking agent, cuprous bromide and N,N',N'',N''-pentamethyldiethylenetriamine constitute a catalytic system, and an atom transfer free-radical polymerization process is utilized to prepare the arteannuin molecularly imprinted composite membrane. A static adsorption experiment is used for researching the adsorption equilibrium, dynamics and selective recognition performance of the imprinted membrane; and the result proves that the arteannuin imprinted membrane has fast adsorption dynamical properties and excellent arteannuin molecule recognition performance.

The invention relates to a preparation method of a molecularly imprinted composite membrane material, and belongs to the technical field of new materials. The specific steps are as follows: firstly, preparing carbon nanosphere gels with different concentrations as a coagulation bath, putting a preparation desired polyvinylidene fluoride membrane into the carbon nanosphere coagulation bath, and preparing a CNS@PVDF membrane through a phase inversion process; secondly, synthesizing a layer of polydopamine on the surface of the CNS@PVDF membrane to obtain a dCNS@PVDF membrane, and grafting doublebonds on the surface of the membrane through a silane coupling agent to facilitate imprinting polymerization reaction; and finally, performing imprinting polymerization reaction by using ethylene glycol dimethacrylate as a cross-linking agent, acrylamide as a functional monomer and azobisisobutyronitrile as an initiator, so that a high-performance imprinted composite membrane for separating enoxacin molecules is prepared based on molecular imprinting technology. The preparation method has the advantages of simple operation, easy implementation and higher yield, and is expected to be applied to industrial production.

The invention provides a helium mass spectrum leak detection fixture for tube plate welding seams of an evaporator. The fixture comprises a gas cylinder, mobile cores, dynamic seal rings and a static seal ring, wherein the front end of the fixture is provided with an end face flange; the end face flange is provided with a seal groove; the static seal ring is arranged in the seal groove; a group of mobile cores are connected with the gas cylinder and can coaxially and synchronously do the telescopic movement together with the gas cylinder, so that the dynamic seal rings on the mobile cores are respectively plugged up or taken off in a tube bundle hole on the surface of the tube plate of the evaporator at the same time; the end face flange and the back end of the main body of the fixture are in flexible connection by a corrugated tube; the static seal ring is tightly pressed by negative pressure generated by vacuum pumping; and the static seal ring and the seal groove both are curve-shaped according to the distribution of sealing welding seams on the surface of the tube plate and the condition of welding scars on the surface of the tube plate, and the dynamic seal rings are spindle-shaped. The fixture can quickly detect the welding quality of the sealing welding seams on the surfaces of a plurality of tube plates through the electropneumatic control over the gas cylinder and a leak detector by using an electronic control box.

The invention relates to a preparation method and application of a GO/PVDF (Graphene Oxide/Polyvinylidene Fluoride) molecularly imprinted composite membrane for selectively separating norfloxacin, andbelongs to the technical field of new materials. The molecularly imprinted composite membrane is mainly synthesized through four steps of reactions: firstly, synthesizing graphene oxide nano-sheets;secondly, mixing graphene oxide and PVDF powder, and synthesizing a GO/PVDF mixed membrane through a phase inversion method; thirdly, coating the surface of the mixed membrane with TiO2 (Titanium Dioxide) through a hydrolysis reaction; finally, synthesizing a norfloxacin molecularly imprinted composite membrane by taking the norfloxacin, AM (Acrylamide), EGDMA (Ethylene Glycol Dimethacrylate) andAIBN (Azodiisobutyronitrile) as raw materials. The molecularly imprinted composite membrane is used for detecting residual norfloxacin in a water body. The preparation method provided by the inventionhas the characteristics of convenience in operation, easiness in implementation, higher in yield, mild in reaction conditions and the like, and is expected to be used in industrial production; in addition, static adsorption and selective permeability test results show that the molecularly imprinted composite membrane prepared by the invention has good separating performance and selectivity to thenorfloxacin.

The invention relates to the field of preparation of ethylene carbonate, and provides a catalyst for synthesizing ethylene carbonate as well as a preparation method and an application thereof. The catalyst is a composite oxide catalyst which consists of Zn and one or two of La and Co and is used for synthesizing ethylene carbonate from urea and ethylene glycol. The preparation method comprises the following steps: mixing an aqueous solution of zinc nitrate, an aqueous solution of lanthanum nitrate and an aqueous solution of cobalt nitrate in proportion, adding the obtained mixture into a precipitant urea aqueous solution, controlling the pH value of the solution, and carrying out a co-precipitation reaction to obtain the catalyst. The preparation process of the catalyst is simple and easy to implement, and the cost is low; the catalyst is high in activity, high in ethylene carbonate yield, mild in reaction condition, good in stability and easy to separate and regenerate.

The invention discloses a method for immobilizing fructosyl transferase by taking mesoporous molecular sieve-chitosan as a carrier, and belongs to the technical field of food enzyme engineering. The method comprises the following steps of: absorbing zymoprotein on a mesoporous molecular sieve SBA-15 which is taken as a carrier, adding chitosan and a bifunctional reagent glutaraldehyde and furtherabsorbing and cross-linking, and immobilizing the fructosyl transferase by a two-step absorption-crosslinking method so as to firmly immobilize enzyme molecules on the carrier. The recovery rate of enzyme activity of the immobilized enzyme is over 75 percent, and the thermal stability and the pH stability are superior to those of free enzyme. Compared with other immobilization methods, the invention has the advantages that: the method is easy to operate and lower in cost, and has a good immobilization effect, conditions are mild, and the enzyme molecules are difficult to leak; and the product, namely the immobilized fructosyl transferase can be applied to the production of high-purity fructooligosaccharides.

The invention relates to a preparation method of a 2,5-dyhydroxyl benzoic acid molecule blotting membrane and application of the 2,5- dyhydroxyl benzoic acid molecule blotting membrane, belongs to the technical field of material preparation and in particular relates to a method for preparing the 2,5- dyhydroxyl benzoic acid molecule blotting membrane, which adopts an alumina ceramic membrane as a substrate, adopts impurities 2,5- dihydroxy-benzoic acid (GA) in salicylic acid as a template molecule, adopts cinnamic acid as functional monomer, adopts gamma-methylacryloyloxypropyl trimethoxy silane (MPS) as a cross-linking agent, adopts ionic liquid as 1-butyl-3-methylimidazole hexafluorophosphate as a catalyst and adopts azodiisobutyronitrile (AIBN) as an initiator. Static adsorption and selective permeability experiment are used for researching adsorption equilibrium and selective recognition performance of the prepared molecule blotting membrane. According to the results, the obtained 2,5- dyhydroxyl benzoic acid molecule blotting membrane has higher adsorption capacity and excellent recognition performance of the 2,5- dyhydroxyl benzoic acid molecule.

The invention belongs to the technical field of high molecular materials, and relates to a composite polyolefin material, a preparation method and a use of the composite polyolefin material. The material comprises 9 parts of an outer layer flame-retardant polyolefin material and 1-4 parts of an inner layer reinforced polyolefin layer, wherein the outer layer flame-retardant polyolefin material is prepared from the following components in parts by weight: 50-80 parts of polyolefin 1, 0-30 parts of a filler 1, 16-35 parts of a fire retardant, 0-9 parts of a flame retardant synergist, 0.1-0.4 part of an antioxidant 1 and 0.1-0.4 part of a lubricating agent 1; and the inner layer reinforced polyolefin layer is prepared from the following components in parts by weight: 50-80 parts of polyolefin 2, 0-45 parts of a glass fiber, 0-30 parts of the filler 2, 0-5 parts of a graft, 0.1-0.4 part of an antioxidant 2 and 0.1-0.4 part of a lubricating agent 2. The material has the advantages of being low in cost, light in weight, good in toughness balance, changeable in size and fireproofing, and being capable of being used for a plurality of times.

The invention discloses a method for producing 1,3-diglyceride by immobilized lipase. The method comprises the following steps: mixing unsaturated long-chain fatty acid, glycerinum and the immobilizedlipase, performing stirring reaction at 25 to 40 DEG C for 1 to 12 hours, and performing post-treatment to obtain the 1,3-diglyceride, wherein the unsaturated long-chain fatty acid is at least one ofoleic acid, linoleic acid, linolenic acid, arachidonic acid and docosahexenoic acid; a mole ratio of the unsaturated long-chain fatty acid to the glycerinum is (1 to 3):1; based on the volume of a reaction system, the mass volume concentration of the immobilized lipase is 0.4 to 1 percent; the immobilized lipase is at least one of immobilized rhizopus lipase, myrhizopus lipase, lipase RM-IM, palatase 20000L lipase and Xhlip-O lipase. The method disclosed by the invention has the characteristics of high raw material conversion rate, high enzyme catalysis efficiency, a few of produced impurities, low production cost, suitability for large-scale industrial production and the like.

The invention discloses a normal temperature fast bonderite and producing method of metal plastic deformation, which is characterized by the following: the bonderite is composed of phosphoric acid, methyl ethyl ketone or acetone, eldopaque, manganese dihydrogen phosphate, calcium nitrate, zinc nitrate and water; the method comprises the following steps: mixing, emulsifying, restirring; the raw materials of bonderite is at a low price, which can be used at normal temperature. The method is easy to product, which reduces the costs of conversion.

The invention discloses a compound building template special for concreting, and relates to a building template and a manufacturing method thereof. The compound building template is prepared by bonding an aluminum alloy or zinc alloy sheet and various engineering plastics such as hard polyvinyl chloride, acrylonitrile, butadiene, styrene and the like which are taken as surface materials, and woody or bamboo plywoods or oriented strand boards which are taken as base materials of a sandwich layer by a bonding adhesive through cold pressing molding. Because of respective characteristics of the materials, raw material sources of a surface plate and a baseplate are widened, and the special requirement that the woody or bamboo plywoods or the oriented strand boards are compounded and then used in the building template can be met; and the prepared building template for the concreting has stable quality, and various indexes such as strength, elastic modulus, neatness and smoothness, acid and alkali resistance and the like meet the technical requirements of national bamboo or woody building templates.

The invention discloses a low-volatility monocrystalline silicon slice texturing solution which is characterized by being prepared from the following raw materials in parts by weight: 0.5-1 part of sodium hydroxide, 3-5 parts of an auxiliary agent, 0.2-0.4 part of sodium gluconate, 0.5-1 part of raffinose, 0.3-0.5 part of sodium citrate, 0.3-0.5 part of polyvinylpyrrolidone, 0.5-1 part of cocamidopropyl betaine, 0.3-0.5 part of propylene glycol alginate, 0.1-0.2 part of dimethyl silicone, and 80-100 parts of water. The texturing solution effectively improves the consistency and repeatability of a texturing technology, increases the textured surface density, thereby increasing the efficiency of solar cells and improving the quality of the product; and the texturing solution does not contain IPA and other volatile components, is beneficial to environmental protection and human health, is safe and environmentally friendly, can be reused more frequently, is strong in durability, and saves costs.

The invention provides a method for removing persistent organic pollutants in soil. The method includes the following steps that step one, soil pretreatment is performed; step two, continuous soil leaching is performed; step three, degradation of the persistent organic pollutants and heavy metal recovery are performed; and step four, pyrolysis and high-voltage pulse discharge oxidation are performed. A soil loosening agent is mixed with the soil first to avoid the aggregation of the soil due to the effects of ultrasound, leaching pressure and leaching agent components in the leaching process,and can further solubilize in synergy with the cavitation effect of ultrasound, and most of the persistent organic pollutants are removed by leaching; and then in the pyrolysis-high-voltage pulse discharge oxidation process, heating and temperature rising are performed first, the desorption and decomposition of the persistent organic pollutants can be promoted, and the high-temperature environmentimproves the use ratio of high-voltage pulse energy. The method is simple in process and mature in equipment, saves manpower and material resources, is high in removal rate of the persistent organicpollutants and heavy metal in soil and thorough in removal, and has no secondary pollution.

The invention relates to a compounded rubber overall-diaphragm filter plate. The compounded rubber overall-diaphragm filter plate comprises a steel filter plate, wherein a charging hole is formed in the center of the filter plate; a filter frame formed by welding of round steel is arranged at the peripheral edges of the front and rear surfaces of the filter plate; handles are arranged on two sides of the filter frame; a diaphragm covers the outer surfaces of the filter frame and the filter plate and is hermetically glued to the filter plate at the filter frame and the charging hole; a closed cavity is formed between the diaphragm and each of the front and rear surfaces of the filter plate; the middle and periphery of each closed cavity are closed; a compression medium inlet which is communicated with the two closed cavities is formed in one side of the filter plate; filter cloth covers the outer side of the diaphragm. The compounded rubber overall-diaphragm filter plate is high in elasticity, good in sealing performance, good in temperature resistance, good in structural strength, long in service life, unlikely to deform and break, and low in comprehensive maintenance cost; a steel framework can be repeatedly utilized.

The invention provides a preparation method of low molecular siloxane as well as a used catalyst and a preparation method thereof. The catalyst is a solid acid catalyst formed by a supporter loaded active component, wherein the active component at least contains platinum and zirconium oxide in a ratio of 1:(1-5). The preparation method of the low molecular siloxane comprises the following steps: by taking high hydrogen-containing silicone oil as a raw material, carrying out telomerization at the temperature of 50-110 DEG C in presence of a blocking agent and the catalyst, so that the low molecular siloxane is obtained. A novel catalyst is provided for preparation of the low molecular siloxane by adopting a telomerization process, and the catalyst has the advantages of high catalysis efficiency, specific product and high reutilization frequency.