168results about How to "Increase adsorption sites" patented technology

The invention belongs to the field of waste recycling. The invention provides a preparation method of a phosphorous removal adsorbent. The preparation method comprises the following steps: (1) puttingred mud in an acid solution for backflow so as to obtain red mud after acid activation; (2) soaking the red mud after acid activation into a surface active agent, oxidant or sodium carbonate solution, and carrying out modified treatment to obtain modified red mud; (3) mixing the modified red mud with a rare earth solution, adjusting pH value to be 8 to 10, and loading rare earth ions to obtain red mud loaded with rare earth; and (4) carrying out mixing granulation on the red mud loaded with rare earth, a pore forming material and a binder, and carrying out calcinations to obtain the phosphorous removal adsorbent. The removal rate of the phosphorous removal adsorbent prepared in the invention is more than 95% and can reach 100% at most, the adsorption capacity can reach more than 240 mg/g,phosphorous-containing waste water with the concentration of below 30 mg/L is treated, and the concentration of phosphorous can reach the first grade emission standard of pollution discharge standardin a municipal sewage treatment plant within one hour.

The invention provides a magnetic oxidized graphene/polyethyleneimine adsorbent and a preparation method and application thereof. Magnetic L-dopa modified ferroferric oxide nano particles are bonded to polyethyleneimine modified oxidized graphene to obtain the magnetic oxidized graphene/polyethyleneimine adsorbent material. The adsorbent material has multiple adsorption sites and can achieve quickseparation from wastewater under the effect of an applied magnetic field. The preparation raw materials for the adsorbent material are easy to obtain, experiment conditions are mild, a treatment process is simple, and the material has good performance on the aspect of wastewater treatment.

The invention belongs to the technical field of agricultural environmental conservation and restoration, and specifically discloses a farmland soil conditioner and a preparation method thereof. The farmland soil conditioner is prepared by uniformly mixing treated raw materials comprising quicklime, bentonite, zeolite and sepiolite in proportion. According to the invention, the preparation method is easy and simple to operate; the farmland soil conditioner is reasonable in formulation, has functions of restoring heavy metal pollution in soil, regulating soil acidity and alkalinity and the like, enables the contents of available cadmium and lead in polluted farmland to be decreased by 24.1%-35.1% and 28.7%-44.8% respectively, also enables the contents of available cadmium and lead in rice to be decreased by 34.9%-44.7% and 32.3%-46.1% respectively, improves the soil pH by 0.20-0.31, and is applicable to a variety of farmland soils with heavy metal pollution and serious soil acidification.

The invention relates to a method for preparing nano calcium peroxide by chemical modification. The method comprises the following steps: adding a certain amount of dispersing agent into a prepared calcium salt water solution, and mixing under ultrasonic conditions to prepare a bottom solution; slowly and dropwisely adding oxydol with a certain concentration into the continuously stirred bottom solution, reacting in an ice water bath, and continuing the reaction for 15-20 minutes after the dropwise addition is completed; and centrifugating the mixed solution, repeatedly washing the precipitate with deionized water and isopropanol, and drying in a vacuum drying oven for 12-24 hours to obtain the nano calcium peroxide. The method has the advantages of simple technique, mild reaction conditions and short reaction time; the dispersing agent added in the reaction process is nontoxic and harmless, and thus, no pollutant is generated in the production process; and the prepared product has favorable properties, and the particle size of the nano calcium peroxide is 100nm or so. The invention provides a simple effective new way for preparing nano calcium peroxide.

The invention belongs to the technical field of composite materials and in particular relates to a charcoal-based nitrogen-enriched composite material as well as preparation and application thereof. The preparation comprises the following steps: mixing a metallic organic framework material precursor solution with pyrolysis charcoal so as to obtain a mixed liquid; enabling the mixed liquid to reactunder a stirring condition so as to obtain a metallic organic framework material on the surface of the charcoal through in-situ synthesis; and performing solid-liquid separation, namely washing and drying the obtained solid, so as to obtain the charcoal-based nitrogen-enriched composite material. The pyrolysis charcoal is mixed with the metallic organic framework material precursor solution, themetallic organic framework material is prepared on the surface of the charcoal through in-situ synthesis, the charcoal-based nitrogen-enriched composite material is prepared, and the carbon dioxide adsorption effect of the charcoal-based nitrogen-enriched composite material can be improved, so that the technical problems that in the prior art, a carbon dioxide adsorption material is small in specific surface area, low in nitrogen content, poor in carbon dioxide adsorption effect, insufficient in hardness of a metallic organic framework for gas adsorption, insufficient in intermolecular adsorption retention force, and the like, can be solved.

The invention relates to a composite material for efficiently removing phosphorus in wastewater, and a preparation method and an application of the composite material; the composite material is prepared by the steps: taking a mixture of shell wastes and crop straws as a raw material and carrying out high-temperature thermal cracking under an anaerobic condition to obtain a carbonaceous material; adding the carbonaceous material into phosphorus-containing wastewater, adsorbing phosphate, precipitating and separating to obtain a phosphate-loaded carbonaceous material, and then applying the phosphate-loaded carbonaceous material to adsorption and passivation of heavy metals in contaminated soil. The shell and straw waste resources are fully utilized, mixture thermal cracking carbon with a better phosphorus adsorption effect than that of single thermal cracking or simple compounding of all the raw materials is obtained after high-temperature thermal cracking, the phosphorus-rich carbon material obtained through recovery can be used as a heavy metal contaminated soil conditioner, and the preparation process is green, environmentally friendly and free of pollution.

The invention relates to a preparation method of a novel 3D graphene aerogel based efficient adsorbent. The method is characterized in that a graphene oxide aqueous solution and tetraethylenepentamineare uniformly mixed, the mixture is placed in a high-temperature and high-pressure reactor, a hydrothermal reaction is performed, aminated graphene hydrogel is prepared and processed with a freeze drying technique, and aminated graphene aerogel is obtained. The aerogel adsorbent is prepared with a one-step hydrothermal method, operation is simple, cost is lower, and the prepared aerogel is of a 3D porous and reticulated structure, is quite low in density, has huge specific surface area and shows excellent adsorption effect when used for adsorbing Cr (IV), and the adsorption capacity is as high as 361.48 mg/g.

The invention relates to crosslinked graphene oxide aerogel for wastewater treatment and a preparation method of the crosslinked graphene oxide aerogel. According to the technical scheme, graphene oxide is prepared from flaky graphite with a chemical oxidation method (Hummers method), then epoxy groups are introduced into graphene oxide, amino-containing substances are introduced into graphene oxide, graphene oxide is crosslinked, sizing and drying treatment are performed finally, and the crosslinked graphene oxide aerogel is prepared. The preparation method is simple, the process is simple and convenient, the adopted raw materials are cheap and widely sourced, and the prepared aerogel has good economical efficiency; by introducing amino groups, adsorption sites can be increased, adsorption efficiency of an adsorbent can be improved, the adsorbent is easy to remove from a wastewater system, secondary pollution to water is avoided, and the crosslinked graphene oxide aerogel has great application prospect.

The invention discloses a preparation method and application of a polyvinylamine functional magnetic carbon-based nano adsorbing agent. The preparation method is specifically characterized in that a chemical coprecipitation method is used to deposit magnetic particles to the surface of graphene oxide-carbon nanotubes, and amidation is used to modify high-cation polyvinylamine (PVAm) to the magnetic (graphene oxide-carbon nanotubes) hybrid body. The prepared adsorbing agent has the advantages that the adsorbing agent has large specific surface area and rich adsorption sites, has a large numberof amino functional groups and can effectively combine with phenol through a hydrophobic effect, pi-pi keys, electrostatic attraction and hydrogen bonding so as to effectively remove phenol in wastewater, and the maximum phenol adsorption quantity, calculated through a Langmuir model, of the adsorbing agent is 224.21mg/g; the adsorbing agent can be reused through simple enrichment desorption, andindustrial wastewater treatment cost is lowered.

The invention discloses a method for removing lead in a water body by using magnetic pig manure biochar. The method comprises the steps as follows: magnetic pig manure biochar is added to the lead-containing water body, the pH value of the water body is controlled between 2 and 7, and constant-temperature vibrating treatment is performed to adsorb lead in the water body. The magnetic pig manure biochar is prepared in the following steps: (1) pretreated pig manure is subjected to high-temperature pyrolysis in nitrogen and pig manure biochar is obtained; (2) a pig manure biochar dispersion liquid is prepared, a ferric iron salt solution and a ferrous iron salt solution are mixed and stirred, and an iron salt mixed solution is prepared; (3) the pig manure biochar dispersion liquid and the iron salt mixed solution are mixed and stirred, the pH value is adjusted, boiling, filtration, washing and drying are performed, and the magnetic pig manure biochar is obtained. The method has the advantages of being simple to operate, low in cost, capable of quickly and efficiently adsorbing lead, easy in separation and recovery, reusable, environmentally friendly and the like.

The invention discloses a preparation method and an application of a two-dimensional crystal MXene nanomaterial, and relates to the technical field of novel energy storage. The preparation method comprises the following steps: crushing and sieving a ternary layered ceramic MAX phase material to obtain an MAX phase ceramic powder; and immersing the MAX phase ceramic powder in a mixed solution composed of a fluorine salt and an inorganic acid, stirring and reacting the obtained solution, and centrifuging, washing and drying the obtained reaction product to obtain the two-dimensional crystal MXene nanomaterial. The method has the advantages of simple process, low cost, no special process device, convenience, high efficiency and good safety, and the MXene nanomaterial can be used as an electrode material of a lithium battery to improve the cyclic structural stability of the material and improve the specific capacity and the cycle life, and is an excellent lithium battery electrode material.

The invention belongs to the field of lithium ion battery material preparation, and in particular relates to a preparation method of a carbon nanotube modified lithium-rich manganese-based positive electrode material xLi2MnO3. (1-x) LiMO2. According to the preparation method, a precursor and a carbon nanotube are modified at the same time in a pre-oxidation mode; a conductive network combination of the carbon nanotube and the positive electrode material can be formed; and the conductivity of the prepared material is improved. The preparation method comprises the steps of uniformly mixing a transition metal salt solution according to a stoichiometric ratio, dropwise adding a precipitant and a complexing agent, washing and drying to obtain a precursor, stirring, dispersing and drying the precursor and a carbon nanotube aqueous dispersion, adding into an oxidant solution for pre-oxidation, drying, mixing with a lithium source, calcining and cooling to obtain a final product. The lithium-rich manganese-based material disclosed by the invention not only has high specific capacity, but also has excellent rate capability and cycle performance. A lithium ion battery adopting the positive electrode material has huge application potential in the aspect of power batteries.

The invention relates to the field of groundwater pollution remediation, in particular to a porous permeable geopolymer material and a preparation method and application thereof. According to the geopolymer material, mineral powder and solid waste are subjected to a geopolymerization reaction under excitation of a sodium silicate exciting agent to form a porous matrix, the through hole rate and the specific surface area of the material are improved by applying the saponification reaction characteristic of animal and vegetable oil, a self-degradable material is embedded in the porous matrix, and the self-degradable material is degraded along with time and releases internal active substances. The preparation method of the porous permeable geopolymer material comprises the following steps: taking a geopolymer prepared from a high-activity silicon-aluminum natural mineral or solid waste or a mixture of the high-activity silicon-aluminum natural mineral and the solid waste as a raw material under the action of an exciting agent as a matrix material, adding a pore-forming agent to form pores in the matrix, embedding the self-degradable particles, and conducting curing to obtain the porous permeable geopolymer material. The problems that in the prior art, an underground water permeable reactive barrier needs to be constructed in a filling mode, reactive barrier engineering is complex, and the construction period is long, so that the early-stage investment is large, and the defect that the permeability coefficient of a conventional permeable reactive barrier is gradually reduced along with the increase of the service life is overcome.

The invention relates to a nano titanium dioxide modification method of an electric adsorption desalinization carbon electrode, belonging to the field of manufacturing of main electrode components of an electric adsorption water purifier. The method comprises the following steps: pretreating a formed electrode, immersing in a nano titanium dioxide sol for some time, taking out, drying at a certain temperature, and carrying out heat treatment to form a titanium dioxide film layer on the wall surface of the interior pore canal of the electrode, thereby obtaining the modified electrode. The modified electrode can not easily generate acid or alkali in the electric adsorption desalinization process, has the advantages of high electric adsorption rate and higher specific surface utilization efficiency, and enhances the electric adsorption capacity of the carbon electrode, so that the desalinization property of the electrode is sufficiently displayed.

The invention provides a method of modifying magnetic chitosan with ethylenediamine and an application of diclofenac in wastewater treatment and belongs to the technical field of material preparationand water environmental protection. The method of modifying the magnetic chitosan with the ethylenediamine is characterized in that an one-step precipitation method is adopted to allow pellets to slowly drop into an alkaline solution and form spherical adsorbents, so that separation and precipitation are easy, and secondary pollution to water bodies is avoided, and the method is simple in operation and mild in reaction conditions; magnetic separation technology is adopted to organically combine ferroferric oxide with chitosan molecules, so that synthesized adsorbent pellets are made to be magnetic and can be quickly and efficiently separated from wastewater under the action of an external magnetic field. Furthermore, the method of modifying the magnetic chitosan with the ethylenediamine has the advantages of being capable of increasing the chemical stability of the chitosan by crosslinking with glutaraldehyde, increasing adsorption sites of contaminants with the number of amino groupson the chitosan molecules increased after the modification with the ethylenediamine, and thus enhancing adsorption capacity of the diclofenac.

The invention discloses crosslinked polystyrene-polypropenyl hydroximic acid inter-penetrating network resin and a preparation method and application thereof. The resin is formed by polypropenyl hydroxamic acid or polypropenyl hydroxamic acid with a rare earth metal ionic imprint penetrating through spherical crosslinked polystyrene macroporous resin holes. The preparation method comprises the following steps: firstly preparing the spherical crosslinked polystyrene macroporous resin; then preparing the polypropenyl hydroxamic acid or polypropenyl hydroxamic acid with the rare earth metal ionic imprint in the spherical crosslinked polystyrene macroporous resin holes by virtue of an in-situ polymerization method to form a double network inter-penetrating polymer network structure. The preparation method of the crosslinked polystyrene-polypropenyl hydroximic acid inter-penetrating network resin disclosed by the invention has the advantages of being simple to operate, short in production period, low in production cost, high in reaction yield and the like. The prepared resin can be used for separating rare earth metal ions enriched in a solution and can be particularly used for efficiently and selectively separating target rare earth metal ions in the mixed rare earth metal ion solution.