81results about How to "Raw materials are economically available" patented technology

The invention discloses a method for treating chlorinated organic pollutants in underground water by using a slow-release compound repair material. The method comprises the following steps: (1), preparing charcoal through high temperature pyrolysis; (2), pre-treating zero-valent iron through acid pickling; (3), adding water into the charcoal, then adding xanthan gum and an organic carbon source, and finally, adding zero-valent iron, and through steps of treating, obtaining the slow-release compound repair material; then treating chlorinated organic pollutants in underground water by adopting an in situ injection repairing method or an in situ PRB repairing method. According to the method provided by the invention, the xanthan gum with high mechanical strength and strong mass transfer performance is used as a novel slow release embedding medium, the physical adsorbent charcoal, the chemical reductant zero-valent iron and the bioreductive drug organic carbon source are taken as effective components for composite embedding, so that gel microspheres with stable structures are formed, and the method provided by the invention has the advantages of sustained release, simple and convenient operation, low cost, environment friendliness and the like, can effectively achieve physically, chemically and biologically collaborated and enhanced remediation, and can effectively remove target pollutants.

The invention provides a conductive adhesive preparation method and a conductive adhesive. The preparation method comprises the steps as follows: step one, graphene oxide is prepared; step two, a functional reagent is provided and reacts with graphene oxide to prepare functional graphene; step three, a curing agent and an organic solvent are provided and mixed with a certain quantity of conductive particles to prepare a conductive particle dispersion liquid through ultrasonic treatment, and the conductive particles adopt functional graphene or mixtures of functional graphene and other conductive particles; step four, adhesive resin is provided and diluted by the organic solvent provided in the step three; and step five, the adhesive resin diluted in the step four is mixed with the conductive particle dispersion liquid to prepare a conductive adhesive pre-mixture, the conductive adhesive pre-mixture is stirred repeatedly and uniformly and further subjected to ultrasonic dispersion, the organic solvent is removed, and the conductive adhesive is prepared.

A zero-valent iron and biochar composite chemical for in-situ remediation of groundwater contaminated with chlorinated hydrocarbons is prepared from materials in percentage by weight as follows: 5%-30% of zero-valent iron powder, 8%-30% of a biochar source, 35%-85% of water, 0.1%-1% of a stabilizer, 1.5%-3% of a thickener, 0.3%-1% of an emulsifier and 0.01%-0.1% of a micronutrient source. The required raw materials are uniformly mixed by mixing equipment with high shearing for 15-30 min, and composite slurry which has good fluidity, is conducive to in-situ injection and can be stably stored is obtained. The prepared zero-valent iron and biochar source composite chemical has excellent fluidity and migration and diffusion capabilities and has a good remediation effect on complex contaminated sites containing both unsaturated and saturated chlorinated hydrocarbons. Besides, the selected raw materials are economic and available, the cost of the chemical is greatly reduced, and large-scale remediation of actual sites is facilitated.

The invention discloses a method for removing trace arsenic from an aqueous solution. The method comprises the steps of: adjusting the pH value of an arsenic-containing aqueous solution with an acid or a base by utilizing the adsorption and coprecipitation principle through culturing and analyzing the plants growing in arsenic environment, adding a copper-containing reagent, an iron-containing reagent or a zinc-containing reagent or simultaneously or respectively adding a mixture of two or more of the copper-containing reagent, the iron-containing reagent and the zinc-containing reagent in the presence of calcium salts, magnesium salts and carbonate, and precipitating, wherein the arsenic content in the water, from which arsenic containing slag is separated, is detected to be less than 0.01mg / L. The method has the characteristics that the trace arsenic element in the aqueous solution can be removed by controlling the addition amounts of the copper-containing reagent, the iron-containing reagent and the zinc-containing reagent as well as the pH value of the solution; the use raw materials are economical and easily available, and harmful elements are not introduced to the system, thus the method is an environment-friendly and economical treatment process; and the process can be widely applied to treatment of arsenic-containing wastewater discharged in the fields of metallurgy, chemical industry, pesticide, pigment, fuel, papermaking, leather manufacture and the like.

The invention discloses a slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater and a preparation method thereof. The preparation method comprises the steps of (1) preparing biochar by high-temperature pyrolysis; (2) pretreating zero-valent iron by acid pickling; and (3) adding water into the biochar, adding xanthan gum and an organic carbon source, adding zero-valent iron finally, and carrying out multi-step treatment on the obtained mixture so as to obtain a slow-release compound repair material for treating chlorine-containing organic pollutants in groundwater. According to the invention, by using the xanthan gum with high mechanical strength and strong mass transfer performance as a novel slow-release embedding agent, the biochar (as a physical adsorbent), the zero-valent iron (as a chemical reductant) and the organic carbon source (as a biological reductant) which are taken as effective components are compositely embedded so as to form constitutionally stable gel microspheres, and the slow-release compound repair material has the advantages of long-term slow-release, easy operation, low cost, environment friendliness, and the like, and can effectively realize the physical, chemical and biological synergistic reinforced repair, therefore, the material can remove target pollutants more efficiently.

The invention provides highly-transparent flame-retardant modified organic glass and a preparation method thereof. The highly-transparent flame-retardant modified organic glass comprises a polymer shown in a formula (I). According to the highly-transparent flame-retardant modified organic glass, a flame retardant is directly introduced into an organic glass molecular chain through a copolymerization reaction, the obtained flame-retardant organic glass has excellent flame resistance, transparency and colorability, and secondary pollution does not exist in the using process. The preparation method comprises the steps that methyl methacrylate is adopted as solvent; on the condition that a polymerization inhibitor exists, 2-oxo-2-chlorine-5,5-dimethyl-1,3,2-phospho heterocycle hexane and N-hydroxymethyl acrylamide are reacted to obtain mixed liquor of a phosphorus and nitrogen reaction type flame retardant shown in a formula (II) and vinyl acetate, under the action of an initiator, prepolymerization, low temperature polymerization in a mold and demoulding are conducted, and the highly-transparent flame-retardant modified organic glass is obtained. A methyl methacrylate monomer is adopted to serve as the solvent, solvent recovery does not exist in the preparation process, industrial three wastes are not produced, separation and purification are not needed for a product, operation is easy and convenient, and industrial production is easy.

The invention discloses a slow-release repairing material for organochlorine pesticide contaminated farmland soil. A preparation method of the slow-release repairing material comprises the following steps: preparing a biochar carrier; pretreating zero-valence iron powder; and preparing the slow-release repairing material. The slow-release repairing material comprises, by mass, 15-30% of the biochar, 10-20% of an organic carbon source, 5-10% of zero-valence iron, 5-10% of illite and 25-50% of guar gum. The organic carbon source can promote the activity of degrading bacteria as a growth matrix,and the biochar has a strong physical adsorption effect on organochlorine pesticides and provides inorganic nutrient minerals for soil; above effective components are organically combined by an embedding agent to realize the physical-chemical-biological synergistic enhanced repairing of the organochlorine pesticide contaminated farmland soil, so the pollutant removing effect is good, the treatmentlong-acting property of the organochlorine pesticides by the repairing material is improved, and fly-away loss caused by direct application of a powdery raw material is reduced. The slow-release repairing material for organochlorine pesticide contaminated farmland soil is suitable for repairing farmland soil contaminated with low-concentration organochlorine pesticides, and has a very broad application prospect.

The invention discloses a method for removing trace cadmium from an aqueous solution. The method comprises the following steps: culturing and analyzing plants growing in a chrome environment, adjusting the pH value of a cadmium-containing aqueous solution with acid or alkali; simultaneously or separately adding ferriferous reagents, carbonates and phosphates or molybdates into the aqueous solution; standing still for depositing, separating out cadmium-slag containing water, wherein the cadmium content of the cadmium-slag containing water is detected to be less than 0.01 mg / L. The method disclosed by the invention is characterized in that through controlling the adding amounts of the ferriferous reagents, the carbonates and the phosphates or the molybdates and the pH value of the cadmium-containing aqueous solution, trace cadmium elements in the cadmium-containing aqueous solution can be removed, and the water treatment time is short, adopted materials are economic and easy to obtain, and no harmful element is added into a system, therefore, the method is an environment-friendly and economic treatment process, and the process can be widely applied to the treatment of cadmium-containing wastewater discharged in the fields of the metal processing industry, the electroplating industry, the leather making industry and the textile industry, and the like.

The invention discloses a method for preparing a lightweight building block by using foam glass waste material, which is characterized in that a foam-containing cement-based gelling material is used for bonding the foam glass waste materials together. According to the invention, the addition of the foam is controlled for adjusting the unit weight of the foamed cement mortar, and the preparation method of the lightweight building block should be selected according to the unit weight of the foamed cement mortar. The method comprises the following steps: 1)when the foam addition is 0L / Kg-0.6L / Kg(weight ratio of foam volume to the cement-based material), employing a filling method for forming, and 2)when the foam addition is 1.2L / Kg-3.5L / Kg, employing a stirring casting method for forming, uniformly stirring the foam glass fragments and foamed cement mortar, dumping in a mold for forming, after the foamed cement mortar is hardened, demoulding, and completing the maintenance to obtain the foam glass waste material lightweight building block. The foam glass waste material is capable of changing waste into valuables, and the obtained lightweight building block can be used for insulating the outer walls, the baffle walls and roof of the building.

The invention relates to a preparation method and applications of a nitrogen doped carbon particle / graphitized carbon-nitrogen composite material, and belongs to the field of nano composite material preparation. The preparation method mainly comprises following steps: mixing graphitized ZIF-8 polyhedral particles with urea and glucose, grinding the mixture, then burning the powder at a temperatureof 550 DEG C, then burning the powder at a temperature of 700 to 900 DEG C in an inert gas atmosphere so as to further carbonize the material, and finally carrying out pickling to obtain the nitrogendoped carbon particle / graphitized carbon-nitrogen composite material. Due to the addition of mesoporous nitrogen doped carbon particles, the stacking of graphitized carbon-nitrogen layers is inhibited effectively, and thus the composite material has a large specific surface area and a layered porous structure. The preparation method has the advantages of simple and easy technology, good repeatability, low cost, and easy industrial production. The composite material is used as the electrode material of a super capacitor and has high electrochemical energy storage activity.

The invention discloses a preparation method of a supported BiOIO3 photo-catalyst. The preparation method comprises the following steps: firstly, preparing a BiOIO3 powdery photo-catalyst by adopting a hydrothermal synthetic method; preparing the supported BiOIO3 photo-catalyst by adopting a dipping-pull method. The preparation method comprises the following concrete steps: firstly weighing a certain amount of BiOIO3 powder; adding 30ml of absolute ethanol; ultrasonically dispersing for 30min; adding glass fiber cloth; performing dipping-pull for a plurality of times; drying at the temperature of 80 DEG C; repeatedly performing the operation for three times to obtain the supported BiOIO3 photo-catalyst. The supported BiOIO3 photo-catalyst prepared by the method disclosed by the invention is high in catalytic activity, good in stability, capable of effectively removing elemental mercury by oxidization, good in application prospect in the field of control on emission of the elemental mercury in coal-fired flue gas, simple in preparation process and production equipment, free of secondary pollution and easy to produce industrially.

The invention discloses a chiral alpha-(trichloromethyl) amine compound and a preparation method thereof. The chiral alpha-(trichloromethyl) amine compound is a potential bioactive molecule synthesis building block and can serve as an important midbody for synthesizing chiral chloric amine compounds, such as 2,2-dichloro aziridine. The preparation method of the invention has moderate technological condition and abundant and cheap raw materials, and the prepared alpha-(trichloromethyl) amine has high optical purity and is convenient to industrially apply. The alpha-(trichloromethyl) amine prepared by the invention can be widely applied in the fields of asymmetric synthesis and medicine research and development. The structural general formula is disclosed in formula (3).

The invention discloses a method for removing trace chromium in aqueous solution. The method comprises the following steps of: culturing and analyzing a plant grown under a chromium environment, regulating the pH value of chromium-containing aqueous solution by using acid or alkali, adding calcium-containing reagent and carbonate simultaneously or respectively, standing, precipitating, and separating out water containing chromium slag, wherein the chromium content of the water is less than 0.01 mg / L by detection. The method has the characteristics that: the trace chromium compound in the aqueous solution can be removed by controlling the adding quantity of the calcium-containing reagent and the carbonate and controlling the pH value of the solution; and the water treatment time is short, the raw materials are economic and easily obtained, and any harmful element is not added into the system, so the method is an environmentally-friendly and economic treatment process. The process can be widely applied to the treatment of the discharged chromium-containing waste water in the fields of metal processing industry, electroplating industry, leather making industry, textile industry and the like.

The invention relates to a method for preparing food-grade xylooligosaccharide, which comprises the following steps of: putting xylose, edible acid and polyol into a reaction kettle in a weight ratio, mixing the mixture uniformly to perform polymerization, controlling the temperature to be between 140 and 260 DEG C, reacting the mixture for 0.25 to 4 hours under the vacuum degree of 0 to 1 to form a polymer, and cooling and crushing the polymer to obtain the food-grade xylooligosaccharide. The polymer content of the xylooligosaccharide obtained by the method is up to over 93 percent, the reducing sugar content is less than 1 percent, and the average molecular weight is between 500 and 900; and the xylooligosaccharide is of milk white, has good mouthfeel and can fully meet the application in food processing.

The invention discloses a high-temperature resistant packaging material which comprises the following raw materials in parts by weight: 5-15 parts of polyethylene terephthalate, 5-15 parts of butylene terephthalate, 5-10 parts of talc powder, 5-15 parts of xylan, 5-10 parts of silicon dioxide, 5-10 parts of epoxypropane butyl ether, 5-10 parts of glass fiber powder, 5-10 parts of salicylic acid, 5-10 parts of magnesium oxide, 5-10 parts of zirconium phosphate, 5-10 parts of boron mononitride, 5-10 parts of graphite, 5-10 parts of aluminum silicate fiber, 5-15 parts of polyetherimide, 10-15 parts of polybenzimidazole, 5-10 parts of amino silane and 5-10 parts of phenyl silane. The invention also discloses a preparation method of the high-temperature resistant packaging material.

The invention discloses a method for treating persistent halogenated hydrocarbons in soil by a slow-release compound remediation agent. The method includes steps: pre-ploughing contaminated soil, directly spreading a certain quantity of the slow-release compound remediation agent into ploughed soil, harrowing to well mix, watering to keep certain moisture content, and covering the soil surface with a protecting layer to realize anaerobic reduction dehalogenation reaction, wherein spreading quantity of the remediation agent is 0.05-1.5% of the dry weight of the contaminated soil, the soil ploughing depth is 25-40cm, the soil moisture content is adjusted to 50-80% of maximum field moisture capacity after spreading of the remediation agent, and remediation treatment time is 30-350d. The remediation method takes advantages of great adsorption performance of black charcoal, efficient chemical reducibility of nano zero-valence metal and dissimilatory iron reduction dehalogenation performanceof functional microorganisms to achieve physical, chemical and biological synergistic remediation effects on persistent halogenated hydrocarbon contaminated soil and has advantages of long action period, structural stability, low cost, environmental friendliness and the like.

The present invention discloses a nano composite. The nano composite is characterized by comprising photothermal conversion nanoparticles, a fusion agent, a paramagnetic component and an active targeting antibody; wherein the active targeting antibody contains carboxyl groups and the fusion agent contains amino groups; the carboxyl groups of the active targeting antibody is linked to the amino groups in the fusion agent. The nano composite has an active targeting property, integrates a magnetic effect and a photothermal effect in one, and particularly has better affinity for CD 133 receptor high-expression pancreatic cancer and related cancers. The present application also discloses a preparation method and an application of the nano composite. The method is mild in conditions, not high inrequirements on equipment, operation, environment, etc., economic and easily-obtained in raw materials, easy for implementation and good in stability and reproducibility. When the nano composite is used for magnetic resonance imaging and photothermal integration materials, the nano composite can effectively shorten T1 relaxation time, remarkably improves magnetic resonance T1 relaxation rate, andis better in T1 imaging, higher in contrast and also excellent in a near infrared photothermal effect.

The invention discloses an anticancer drug complex. The anticancer drug complex has a core-shell structure, wherein a core of the core-shell structure is an anticancer active component, and a shell ofthe core-shell structure is formed by combining at least one of neuropeptide Y or a subtype thereof with a zeolite imidazate skeleton structure material. The invention also discloses a preparation method of the anticancer drug complex, wherein the method comprises the following steps: 1) dissolving a zinc source, 2-imidazolaldehyde and the anticancer active component in a solvent respectively, toobtain three solutions; 2) mixing the three solutions in the step 1 evenly, carrying out centrifugal separation and drying; and 3) dispersing the dried product in the step 2) in a solvent, adding atleast one of neuropeptide Y or the subtype thereof, and carrying out a stirring reaction for 12-72 h. The invention also discloses an application of the anticancer drug complex in preparation of drugsfor cancer treatment, preferably, cancer includes breast cancer with high expression of neuropeptide Y1 receptors and high metastatic breast cancer.

The present invention relates to a nano manganese oxide molecular sieve for room temperature efficient nitrogen oxide removal and a preparation method thereof. The nano manganese oxide molecular sieve is prepared by doping a nano manganese oxide matrix with 0 to 30% by weight of an alkaline earth metal ion; the specific surface area of the nano manganese oxide molecular sieve is 160-270m<2 > / g; and the nano manganese oxide molecular sieve has surface oxygen vacancies. The nano manganese oxide molecular sieve has a high specific surface area, and thus having high nitrogen oxide adsorption storage capacity. The nano manganese oxide molecular sieve also has many surface defects (surface oxygen vacancies), and the surface defects can be used as catalytically active sites to enhance catalytic performance. Furthermore, by doping of the alkaline earth metal ion, the nano manganese oxide molecular sieve alkaline is enhanced, and acid nitrogen oxide adsorption storage capacity is enhanced.

The invention discloses a preparation method of a dual-activity monatomic ammonia synthesis catalyst. Ferric iron salt and divalent transition metal salt serve as raw materials, bimetal containing gelis prepared by a sol-gel method and calcined in inert gas atmosphere to obtain a black solid product, and then the black solid product is reduced by a reducing agent to obtain the dual-activity monatomic ammonia synthesis catalyst. In the sol-gel method, alcohols solvents and urea serve as coagulant aids, and tetraethyl orthosilicate is hydrolyzed under acid catalysis to prepare the bimetal containing gel. The raw materials are economical and easy to obtain, the method is convenient, product performances are stable, recycling is facilitated, and the catalyst can be used for synthesizing ammonia at room temperature and under normal pressure.

The invention discloses an ultra-thin nanosheet self-assembled multi-layer BiOCl microsphere and an application thereof in photocatalytic coupling of a benzylamine to an imine, and belongs to the technical field of photocatalytic material preparation. The ultra-thin nanosheet self-assembled multi-layer BiOCl microsphere is prepared by a solvothermal method by using Bi(NO3)<3>.5H2O and KCl as raw materials and ethylene glycol as a medium under assistance of a surfactant PVPK30. The nano microsphere has a diameter of 1.3-1.6 [mu]m, and the ultra-thin BiOCl nanosheet constituting the microsphere has an average thickness of 3.8 nm. The BiOCl nano microsphere has relatively high activity in photocatalytic coupling of a benzylamine to a corresponding imine, and problems of long reaction time, low conversion rate and the like in preparation of an imine of a conventional BiOCl material are solved. The microsphere has the advantages of simple process, short preparation period, green environment protection, high conversion rate, high stability, and being reusable, actual production needs are met, and application potential is relatively great.

The invention provides a phospholipid punicic acid grease compound, a preparation method and an application thereof. The phospholipid punicic acid grease compound is prepared from the following components by mass percent: 55-85% of diglyceride, 10-45% of triglyceride, 0.2-8% of monoglyceride and 0.03-9% of residue; the mass ratio of punicic acid to fatty acid in the whole glyceride composed of monoglyceride, diglyceride and triglyceride is (0.3-0.7):1; the residue contains free fatty acid and glycerinum. The invention relates to the preparation method for the compound and the application of the compound in functional food and drugs. The phospholipid punicic acid grease compound prepared according to the invention has a weight-losing effect of diglyceride and also has the anti-inflammatory and weight-losing effects of punicic acid, so that the compound can be used in the functional food and drugs for controlling weight, improving blood fat and enhancing immunity. In a word, the compound has the advantages of simple preparation process, low cost and wide application prospect.

The invention belongs to the field of biomass charcoal adsorption materials, and discloses a camellia oleifera shell carbon powder material. A preparation method comprises the following steps: crushing camellia oleifera shells, mixing the obtained camellia oleifera shell powder with water; performing ultrasonic treatment and stirring, performing hydro-thermal treatment on anobtained mixed solution, drying to obtain carbon powder, mixing and grinding the obtained carbon powder and KOH, performing heating roasting treatment on the obtained mixed powder under the protection of argon atmosphere, cooling to room temperature, washing with water to be neutral, and drying anobtained product to obtain the camellia oleifera shell carbon powder material. The camellia oleifera shell carbon powder material disclosed by the invention is simple in preparation process, economical in raw materials and applicable to large-scale production, has the characteristics of short adsorption equilibrium time andhigh adsorption capacity in a tetracycline wastewater purification process, and has the advantages of easiness in recovery, stable chemical property and no toxic or side effect.

The invention relates to a taurine energy food and belongs to the field of food. The taurine energy food is prepared from cereals, nuts, an adhesive, taurine and other additives. Cereals are one or more of oat, wheat and corn. Nuts are one or more of peanut, apricot kernel, cashew nut and pine nut. The taurine energy food has the advantages that the solid taurine energy food is prepared by breaking common rules; the taurine energy food is more convenient to carry and contains more energy compared with other energy foods; the taurine energy food is healthier and easier to absorb compared with energy supplement foods among which chocolate is the commonest; sugar in energy bars is monosaccharide, disaccharide and oligosaccharide. Oligosaccharide is formed by polymerization of 3-10 monosaccharides and can stably release energy. Therefore, energy can be provided by the energy bars quickly, sustainable energy supply can be guaranteed, energy relay is realized, a stable blood glucose level is maintained, and athletic ability is improved.

The invention relates to a method for synthesizing an alkenyl borate compound by a transfer boronation. The method comprises the steps that substituted olefin and styrene boronic acid pinacol ester are dissolved into a solvent, then a zirconium catalyst is added, in a protective atmosphere, reacting is carried out at 60-150 DEG C for 8-36 hours, and then separating is conducted to obtain the styrene boronic acid pinacol ester compound. The method is easy to operate and low in cost, use of diborane and excessive olefin is avoided, and the obtained alkenyl borate compound can be applied to medical synthetic intermediates and organic photoelectric material science.

The invention discloses a nanocapsule type polydopamine drug material and a preparation method and application thereof and belongs to the field of nano-drugs and preparation thereof. The nanocapsule type polydopamine drug material is prepared by a one-step synthesizing method. The preparation method has the advantages that an organic metal frame is used as the template to fix drugs, and accordingly drug loading capacity is increased greatly; the prepared nanocapsule type polydopamine drug material is high in drug loading capacity and capable of promoting drug release under near infrared mediation to achieve combined treatment; the preparation method is mild in conditions, low in requirements such as equipment requirements, operation requirements and environment requirements, economical in raw material, easy in raw material obtaining, easy to implement and good in stability and reproducibility.

The invention belongs to the field of biochemistry and mainly relates to a coumarin skeleton based Wittig reagent as well as a preparation method and application thereof. The Wittig reagent disclosedby the invention is based on coumarin skeleton improvement, and a structural formula of the reagent is shown as a formula I. In addition, the invention further provides a preparation method of the compound and application thereof in a nucleic acid detection aspect. According to the coumarin skeleton based Wittig reagent designed in the invention, in an effective combination of a fluorescence sensing technology and a traditional Wittig reaction, high-sensitivity high-selectivity detection of 5-formyl uracil (5fU) is realized. Meanwhile, the reagent is simple in synthetic route, mild in reactionconditions and economic and readily available in raw materials, and provides a new thought for designing the conventional reactive 5-formyl uracil (5fU) fluorescence probe.

The invention provides a preparation method of a clay-calcium-based sulfur fixing agent. The preparation method includes acidizing calcium oxide with tartaric acid, drying, grinding, and calcining ina muffle furnace to obtain acidized calcium oxide; and mechanically mixing the acidified calcium oxide and natural clay and grinding evenly to obtain the clay-calcium-based sulfur fixing agent. The sulfur fixing agent has the advantages of fluffy structure, uniform particle distribution, increased specific surface area, high sulfur fixing rate, good thermal stability of sulfur fixing products andthe like, is used for sulfur fixing of cow dung / high-sulfur composite coal, wherein the sulfur content (St, ad) of the briquette is less than 0.50%, and the sulfur fixing rate reaches about 70.0%, andthus sulfide emission during combustion of the cow dung / high-sulfur composite coal is effectively reduced. In addition, the sulfur fixing agent prepared by the method has the advantages of easily-available raw materials, safe use, simple preparation process and better economy and application.

The invention discloses framework molecules based on folding and assembling of cyclic polymers and a preparation method thereof. The framework molecules have a chemical name of cyclic polyesters whichcomprise cyclic di-polyester namely 1-Ar, cyclic tri-polyester namely 2-Ar, cyclic tetra-polyester namely 3-Ar, cyclic penta-polyester namely 4-Ar and cyclic hexa-polyester namely 5-Ar, wherein Ar represents one selected from the group consisting of phenyl-1,4-diyl namely Ph, biphenyl-4,4'-diyl namely BP, 2,2-bipyridine-5,5'-diyl namely BPy and pyrene-2,7-diyl namely Pr, which have structural formulas as described in the specification. The preparation method for the framework molecules comprises the steps of carboxyl acylating chlorination with a thionyl chloride reflux method, ester exocondensation with a solvent-free method, and cyclic polyester separation with a gradient elution method. According to the invention, by utilization of the characteristic of formation of a nanometer cavitywith a larger size through intermolecular assembling, four series of cyclic polyester supramolecular host compounds are developed. The cyclic polyesters provided by the invention have the advantages of fewer synthetic steps, mild reaction conditions and low separation and purification cost.

The invention discloses a sustained-release composite remediation agent for treating persistent halogenated hydrocarbon in groundwater and a preparation method thereof. The preparation method comprises the following steps: 1) preparing bacterial liquid saturated black carbon; 2) preparing a colloidal solution A containing locust bean gum and an organic carbon source; 3) preparing a colloidal suspension B containing locust bean gum, an organic carbon source, a nano-scale zero-valent metal and the bacterial liquid saturated black carbon; 4) carrying out a crosslinking reaction for 2-6h; and 5) carrying out a delayed crosslinking reaction for 2-6h to obtain a sustained-release composite remediation agent for treating persistent halogenated hydrocarbon in groundwater. The sustained-release composite remediation agent prepared by the method provided by the invention can utilize the good adsorption performance of black carbon, the high-efficiency chemical reducibility of the nano-scale zero-valent metal and the dissimilation iron reduction dehalogenation capability of functional microorganisms to achieve the physical, chemical and biological synergistic remediation effect of persistent halogenated hydrocarbon polluted groundwater, and has the advantages of long action period, stable structure, low cost, environmental friendliness and the like.