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228 results about "Organic structure" patented technology

Mixed matrix type cation exchange membrane and preparation method thereof

The invention relates to a mixed matrix type cation exchange membrane and a preparation method thereof. The cation exchange membrane takes a sulfonated modified polymer material as a substrate and isdoped with Schiff base type covalent organic framework materials loaded with different functional groups. The preparation method comprises the following steps of: sequentially performing monomer preparation and polymerization of a covalent organic framework material, sulfonation modification of a polymer, uniform mixing of the covalent organic framework material and a sulfonated polymer, and flow-spreading film formation; and finally, performing acid treatment to obtain the cation exchange membrane. The covalent organic framework material can effectively improve the vanadium resistance of themembrane based on the rigid porous structure; the organic porous structure of the covalent organic framework and the different functional modifications can partially compensate the loss of membrane proton conductivity caused by the introduction of particles; the rigid framework can obviously inhibit the swelling in the membrane and can improve the tensile strength of the membrane; COFs is composedof organic structures and can promote compatibility between sulfonated polymers and covalent organic framework materials; and moreover, the polymer as the substrate can improve the film forming performance of the covalent organic framework material, so that the covalent organic framework material has the better mechanical strength.
Owner:DALIAN UNIV OF TECH

Method for removing trace amount of toxic pollutants in water by enzyme-loading magnetic particle reinforced flocculation

The invention relates to a method for removing a trace amount of toxic pollutants in water by enzyme-loading magnetic particle reinforced flocculation. The method comprises the following steps that 1, enzyme-loading magnetic particles are used, an enzymatic cross-coupling polymerization reaction is controlled so that a trace amount of toxic pollutants enter into an organic macro-molecule structure by covalent binding, and after the reaction, the hydrophobicity and molecular weight of the organic structure are improved; 2, the enzyme-loading magnetic particles are subjected to magnetic recovery; and 3, the recovered enzyme-loading magnetic particles are added with a flocculating agent, and the pollutants obtained by enzymatic polymerization are easily precipitated and removed by coacervation/flocculation processes such as double electrode layer compression, adsorption electrical neutralization and precipitation net-capturing and thus a trace amount of the toxic pollutants in water are removed by enzyme-loading magnetic particle reinforced flocculation. The method has good selectivity and good treatment effects on low-concentration toxic pollutants, realizes recovery and use of an enzyme, has a low cost and a wide application range and is suitable for treatment on natural water, drinking water and waste water containing low-concentration toxic pollutants.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Preparation method of nano ZSM-5 molecular sieve

The invention belongs to the technical field of synthesis of zeolite molecular sieves, aims at providing a preparation method of a green and simple nano ZSM-5 molecular sieve, and in particular relates to a method for preparing the nano ZSM-5 molecular sieve through adding a high molecular polymer, a silicon source, an aluminum source, an organic structure directing agent and de-ionized water intoa synthesis process and uniformly mixing to form sol-gel of a molecular sieve synthetic precursor, and then preparing the sol-gel into dry glue, and utilizing a water steam assisted crystallization method. According to the method provided by the invention, the prepared nano ZSM-5 molecular sieve has the characteristics of relatively high crystallization degree, the crystal size capable of being regulated to be between 10 and 100nm, a mesoporous-micropore composite multi-grade structure, relatively great specific surface area and the like. According to the preparation method of the nano ZSM-5molecular sieve, provided by the invention, the technical defects that the nano molecular sieve is difficult to separate and collect from a mother solution, a lot of synthetic waste liquid is discharged and the like are avoided, and the synthesis efficiency also can be improved; the preparation method is a simple and efficient, and environment-friendly synthetic route and has a certain industrialized application prospect.
Owner:SHENYANG NORMAL UNIV

Aassociation drying Method for preparing dehydrated vegetable and fruit

The invention relates to a dehydrating and drying method for the top-grade vegetable and fruit. After being sliced, the vegetable and the fruit are placed in a microwave vacuum dryer for being dried, the exerting microwave power density is between 0.5 w/g and 1.2 w/g (watt/gram), the vacuum rate is between 2.5KPa and 4.5KPa (remaining pressure), the materials to be dried can do reciprocating movement along with the drying dish in the microwave vacuum dryer. After being dehydrated by about 40-50 percent of the total moisture by the microwave vacuum drying, the materials are taken out and positioned on a stainless steel dish and then are positioned in a freezing dryer, and are frozen and sublimed dry under 25 DEG C below zero, the drying time is about 7-10 hours, and the moisture is lowered to the safe moisture of 6-7 percent. The preserving of the color, the scent, the taste, and the nutritious components of the dehydrated vegetable and fruit which are produced by the invention are quite approximate to that of the single freezing dried products, the volume is 60-70 percent of the volume of the single freezing dried products, the appearance and the organic structure are approximate too, the drying cost is low, and the energy can be saved by 40 percent above.
Owner:JIANGNAN UNIV
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