85results about How to "Increase surface active sites" patented technology

The invention relates to an electrode Ce doped PbO2 used for treating waste water and its preparation method. The electrode is a F-PbO2-CeO2/TiO2-NTs/Ti electrode. The method for producing the electrode comprises that: obtaining a titania nano-tubes array (TiO2-NTs/Ti) matrix prepared by an anodization processing, doping rare earth Ce, preparing a doped-type F-PbO2-CeO2/TiO2-NTs/Ti electrode by using an electrodeposition method. Compared with the prior art, the PbO2 electrode by the present invention has the advantages of high oxygen evolution potential, strong catalytic activity, stable electrode electrochemical performance and long service life. Compared with the traditional PbO2 electrode, the oxygen evolution potential of the electrode is higher than 2.4 V, and accelerated and strengthen life is more than 400 hours, the service life can reach about 40 years. The electrode has the advantages of simple preparation technology and low manufacturing cost, and can be effectively used for an electrochemical oxidation treatment of organic waste water which has high density and is difficult to degrade, the electrode also has a wide economic and social benefit.

The invention discloses a ruthenium complex catalyzer for acetylene hydrochlorinate and a preparation method and application thereof. The catalyzer is characterized in that active carbon serves as catalyst support, and is loaded with ruthenium chloride and an organic ligand; the molar ratio of the ruthenium chloride and organic ligand is 1:1-6, and ruthenium accounts for 0.1-5.0% of the total weight of the catalyzer; the organic ligand is one or more of triphenylphosphine, pyridine, 2,2'-dipyridyl, acetylacetone, chlorodiphenylphosphine, chlorobenzene, cyclopentadiene, 4-methyl isopropyl benzene and 1,5-cyclooctadiene. The ruthenium complex catalyzer for the acetylene hydrochlorinate and the preparation method and application thereof have the advantages that the preparation process is simple, the catalytic activity and stability of the catalyzer are greatly improved, the catalyzer is more environmentally friendly, and the economy is high.

The invention relates to a preparation method of a reed-based biochar adsorption material. The preparation method is technically characterized by comprising the following steps of cleaning the reed stalk, drying and crushing; soaking the crushed reed stalk into a KOH (potassium hydroxide) solution to activate, and drying; putting the dried crushed reed stalk into an atmosphere furnace, and performing oxygen-free high-temperature cracking under the nitrogen or inert gas protection atmosphere; after high-temperature cracking treatment, cooling to room temperature, and cleaning the cracked material to be neutral by an acid solution, so as to prepare the reed-based biochar adsorption material. The preparation method has the advantages that the problems of pollution to environment and waste ofresources due to irresponsible disposal of the wetland plant wastes are solved; compared with the prior art, the specific surface area is large, the pollutant adsorption ability is strong, the environment-friendly value is greatly increased, and the resource utilization of the wastes is realized.

The invention discloses a method for preparing a nitrogen-doped carbon-coated metal nanoparticle composite material by utilizing carbon fibers. The method comprises the following steps: firstly, uniformly mixing and stirring water-soluble transition metal salt and a solution of tannic acid to obtain a metal ion tannic acid viscous composite material; then adding the carbon fibers treated through nitric acid and continually stirring and drying; finally, adding a cyanamide type compound and carrying out calcination and pyrolysis in inert gas, so as to obtain a target product. According to the method disclosed by the invention, a preparation technology is simple in flow, controllable in operation and low in cost; the method has the advantages of safety, high efficiency, greenness and environment protection and the like and is suitable for large-scale production.

The invention discloses a photo-Fenton desulfurization-denitration catalyst and a preparation method thereof. The photo-Fenton desulfurization-denitration catalyst includes a catalyst carrier and photo-Fenton active components which are loaded on the catalyst carrier through a binder, wherein the photo-Fenton active components include tubular manganese-doped graphite phase carbon nitride and ferric molybdate which is loaded on the tubular manganese-doped graphite phase carbon nitride; and the catalyst comprises, in parts by weight, 70-85 parts of the catalyst carrier, 10-30 parts of the binder, 0.5-2.0 parts of the tubular manganese-doped graphite phase carbon nitride and 0.5-2.0 parts of ferric molybdate. The constructed tubular Mn-g-C3N4/Fe2(MoO4)3 has three functions of photocatalysis,ozone catalysis and Fenton catalysis, different catalytic systems can depend on each other, and can be promoted by each other, the content of reactive free radicals is increased, and the desulfurization and denitration efficiency of vacuum ultraviolet light catalysis in cooperation with a H2O2 oxidation absorption system is improved. The catalyst can be widely applied to purification treatment offlue gas, ultra-low emission of SO2 and NOx can be achieved, and the catalyst has the characteristics of low cost, simple synthesis, environmental protection and the like.

The invention discloses a silicon nano-wire-polypyrrole composite material preparation method, which comprises: carrying out metal assisted chemical etching on a single crystal silicon wafer by usingsilver nitrate and hydrofluoric acid to form silicon nano-wires positioned on the single crystal silicon wafer and perpendicular to the surface, coating the surface of the single crystal silicon waferwith the mixed solution of dodecyl benzenesulfonic acid and ammonium persulfate in a spin-coated manner, placing into a closed polymerization device, suspending the wafer above a pyrrole monomer solution, pumping to form a negative pressure, and polymerizing to obtain the silicon nano-wire-polypyrrole composite material. According to the present invention, the preparation method overcomes the disadvantages of the traditional liquid phase chemical polymerization method and the electrochemical preparation method, and has characteristics of simpleness, low cost and low power consumption; the synthesized polypyrrole film is dense and uniform; and the polypyrrole surface modified one-dimensional silicon-based gas sensitive material constructed by the method has high room temperature sensitivity and fast response recovery performance to specific gases.

The invention discloses an MgO/MgCO3 compound adopting a micro-nano hierarchical structure and an application of the MgO/MgCO3 compound serving as a fluorine remover. According to the MgO/MgCO3 compound adopting the micro-nano hierarchical structure, characteristics of low energy consumption, simplicity, easiness in operation and the like of a water bath device lower than 100 DEG C are used and chip inorganic salt is taken as the raw material for preparation of the MgO/MgCO3 compound adopting the uniform micro-nano hierarchical structure and serving as the fluorine remover to be uniformly dispersed in water so as to absorb fluorinions in water. According to the micro-nano hierarchical structure of the MgO/MgCO3 compound, the specific surface area of the material is increased, the fluorine absorbing surface active sites of the material are increased, so that the fluorine absorbing effect of the adsorbent is improved greatly. The MgO/MgCO3 compound fluorine remover adopting the micro-nano hierarchical structure has a wide apparition range for the pH value in water and has remarkable application effect on treatment of fluorine-containing water.

The invention provides a preparation method and application of acid pickled ZVI (zero-valent iron) modified charcoal. The preparation method comprises the following steps: 1) crushing, grinding and drying a biomass raw material; 2) carrying out soaking treatment on the dried biomass into a blended soaking solution, and carrying out centrifugal dehydration drying; 3) putting charcoal into an acid solution, carrying out stirring at a uniform speed at the room temperature, and carrying out centrifugal dehydration drying so as to obtain acid pickled charcoal; 5) under protection of an argon environment, putting the acid pickled charcoal into an iron solution, carrying out stirring for 1 hour at the room temperature, and dropping a NaBH4 solution to carry out a reaction; and 6) after the reaction is completed, carrying out centrifugal dehydration drying, so as to obtain the acid pickled ZVI modified charcoal. The acid pickled ZVI modified charcoal prepared by using the preparation method has a remarkable repairing effect on heavy metal Cr (VI) polluted soil, is capable of effectively reducing the content of Cr (VI) in the soil, and in addition is capable of effectively degrading bio-availability and migration of chromium in the soil.

The invention relates to a g-C3N4 nanosheet/graphene oxide composite material and a preparation method and application thereof. According to the composite material, Bulk-g-C3N4 is synthesized througha pyrolysis method, then g-C3N4 nanosheets are synthesized through an ultrasonic-assisted method and finally the g-C3N4 nanosheets are fixed on the surface of graphene oxide through an ultrasonic method to obtain the composite material. The composite material is modified on the surface of a glassy carbon electrode to prepare a novel sensor for simultaneous, rapid and real-time detection of acetaminophen and levofloxacin. Results show that the sensor has a wide linear range, a low detection limit and high sensitivity for detection of two substances. High-sensitivity detection and analysis of acetaminophen and levofloxacin can be realized and high selectivity can be obtained in the complex environment medium. Meanwhile, the composite material has the advantages of being simple in instrumentand equipment, low in analysis cost, rapid, simple, convenient and the like, and a new detection method can be provided for evaluating residual pollution of acetaminophen and levofloxacin in the environment.

The invention provides a resin graphene composite material, a preparation method and an application thereof, which belong to the technical field of the graphene composite material. The preparation method comprises the following steps: 1) mixing a metal auxiliary agent, a graphene material and water and stirring a mixture to obtain a slurry; 2) drying the slurry to obtain metal graphene; and 3) heating the metal graphene and thermoplastic resin and heating the materials under inert gas atmosphere to the temperature of 50-300 DEG C for a reaction. The preparation method composites the graphene material and the thermoplastic resin, through a Pi bond electron cloud of the graphene material, free electron transmission is carried out, the obtained resin graphene composite material has good conductivity and thermal conductivity, and can be used as a novel electric conduction and heat conduction composite material.

The invention provides an iridium-based multi-component nano-porous catalyst as well as a preparation method and application thereof, belongs to the technical field of catalytic materials, and solves the defects of low anode electrolysis efficiency, large use amount of noble metal in the catalyst and relatively high cost of a water electrolysis hydrogen production catalyst in the prior art. The iridium-based multi-element composite nano-porous catalyst comprises iridium and/or iridium oxide and further comprises an oxide compounded with the iridium and/or iridium oxide, the oxide has conductivity, and the dielectric constant of the oxide is smaller than 80 F/m. The catalyst provided by the invention has low overpotential and high mass activity, the use amount of precious metal iridium can be reduced, and the energy consumed by oxygen evolution reaction is less.

The invention discloses a SnS2 two-dimensional ordered nanopore film as well as a preparation method and application thereof, and belongs to the field of nano materials. According to the preparation method of the SnS2 two-dimensional ordered nanopore film, a two-dimensional honeycomb structure is prepared by adjusting the morphology structure of SnS2 from a PS template to a SnO2 macroporous film to a SnS2 macroporous film, and SnS2 petal structures are distributed, so that the gas-sensitive performance is greatly improved. According to the SnS2 two-dimensional ordered nanopore film and the application thereof, oxygen atoms are replaced by sulfur atoms, so that the oxygen vacancy defect is not limited by the oxygen thermodynamics imbalance problem, and more stable and reliable gas-sensitive performance can be obtained; and on the other hand, the optimal working temperature of traditional SnS2 is optimally reduced to 130 DEG C from traditional 250 DEG C, the gas-sensitive performance is more excellent, and the gas-sensitive response in hydrogen sulfide gas can reach 10000%.

The invention discloses a preparation method of a small-grain-size cobalt-based aluminum oxide catalyst. The method comprises the steps that by adopting a sol-gel method, hydrochloric acid is adoptedas an acidity regulator, acetic acid is adopted as an interface protective agent to synthesize an alumna supporter, then, cobaltous acetate is adopted as a cobalt source, diglycol is adopted as a complexing agent, and a dipping method is adopted for manufacturing the small-grain-size cobalt-based aluminum oxide catalyst. Compared with existing cobalt-based aluminum oxide synthesized by adopting glycine and urea as complexing agents, the grain size of cobaltosic oxide in synthesized cobalt-based aluminum oxide is smaller, the number of catalyst surface active loci is increased, and the interaction strength between the supporter and active ingredients is enhanced. In addition, the cobalt-based aluminum oxide is good in thermal stability, generation of a CoAl2O4 non-active phase can be restrained within the certain temperature range, and the activity of the catalyst in the methane catalyst combustion reaction is improved. The method is easy to implement, the synthesized cobalt-based aluminum oxide can be adopted as a catalyst carrier and can also be adopted as a catalyst obtained after a methane catalysis combustion reaction, and the good application prospect is achieved.

The invention belongs to the technical field of mineral processing, and particularly relates to large-size sea urchin spherical magnesium carbonate trihydrate and porous magnesium oxide assembled by nanorod arrays and a preparation method of the large-size sea urchin spherical magnesium carbonate trihydrate and porous magnesium oxide. The large-size sea urchin spherical magnesium carbonate trihydrate and the porous magnesium oxide are formed by assembling nanorod arrays, the diameters of the large-size sea urchin spherical magnesium carbonate trihydrate and the porous magnesium oxide are 60-150 microns, and the diameter of each nanorod is 50-200 nm; the porous magnesium oxide is prepared by pyrolyzing and calcining the large-size sea urchin spherical magnesium carbonate trihydrate and is of a hierarchical pore structure, that is, the material contains micropores, mesopores and macropores at the same time, and the specific surface area is 110-170m2/g. The reaction conditions are mild and easy to regulate and control, the magnesium carbonate trihydrate and the porous magnesium oxide crystal have a three-dimensional complex multilevel structure, the particle size is large, the morphology order degree is high, and the porous magnesium oxide has a large number of micropores, mesopores and macropores at the same time.

The invention discloses a preparation method of a polyethylene film for a degradable shopping bag, and particularly relates to the technical field of packaging materials; the polyethylene film prepared by the preparation method disclosed by the embodiment of the invention has good mechanical properties, and meanwhile, after the polyethylene film is accelerated to age by ultraviolet light for 10 days, the tensile strength and the elongation at break are obviously reduced, and the degradation degree is high; manganese dioxide, ferric chloride and nano titanium dioxide are doped, ammonia water and beta-cyclodextrin are used for preparing a composite catalyst, and the catalytic efficiency is high; meanwhile, under the action of beta-cyclodextrin, the composite catalyst is in a porous form, andthe catalytic efficiency of the composite catalyst is further improved.

The invention provides a preparation method of a micro-foaming denitration catalyst carrier. The method is characterized by comprising the following steps: grafting an unsaturated carboxylic acid ammonium salt on the surface of industrial-grade anatase-type titanium dioxide; and enabling titanium hydride taken as a combustion explosion agent on the surface of a titanium dioxide particle to perform combustion explosion at a high temperature under the action of an initiator so as to form open micropores, thereby further obtaining the micro-foaming denitration catalyst carrier. The denitration catalyst carrier has the obvious performance that the open micropores are formed through the combustion explosion of the surfaces of the titanium dioxide fineparticles, so that the surface active sites of the denitration catalyst carrier are increased, i.e., active substances carried by the denitration catalyst carrier can be in full contact with nitric oxides so as to perform a catalytic reaction. Thus, the utilization rate of the active substances is greatly increased. The preparation process of the denitration catalyst carrier is easy to control, avoids pollutant discharge and is small in production investment, thereby being suitable for large-scale industrial production. As a result, the denitration catalyst carrier provided by the invention can be widely applied to the denitration of the nitric oxides in a flue gas.

The invention discloses a hydrogen peroxide modified graphite phase carbon nitride nanosheet and a preparation method thereof, and belongs to the technical field of photocatalysis. The preparation method of the H2O2 g-C3N4 nanosheet comprises the following steps: (1) adding Urea g-C3N4 powder into a mixed solvent of H2O2 and ethanol, performing stirring, and then carrying out ultrasonic treatmentto uniformly disperse the solution to obtain a mixed solution; (2) centrifuging and drying the mixed solution obtained in the step (1) to obtain a solid; and (3) grinding the solid obtained in the step (2) into fine powder, putting the fine powder into a crucible, and carrying out high-temperature calcination to obtain the hydrogen peroxide modified graphite phase carbon nitride H2O2 g-C3N4, called HCN for short. Compared with UCN, the modified HCN photocatalyst disclosed by the invention has the advantage that the photocatalytic activity is obviously improved.

The invention discloses a preparation method of an alpha-Fe2O3 nano laminated material. The preparation method comprises the steps as follows: (a) premixing; (b) concentration; (c) hydrothermal synthesis. The invention further discloses a method for preparing benzaldehyde from the material. The preparation method of the alpha-Fe2O3 nano laminated material has the advantages of simple process, low cost and environment friendliness, the obtained alpha-Fe2O3 nano laminated material catalyzes styrene oxide for preparation of the benzaldehyde, and the method has the advantages of high conversion rate and good selectivity.

The invention provides a zero-valent iron composite material and a preparation method and application thereof. According to the zero-valent iron composite material, the technical defects that traditional zero-valent iron is prone to agglomeration and unstable can be overcome, surface active sites are increased, meanwhile, a porous material is further adopted for coating, and therefore the activity of boric acid zero-valent iron is kept. The zero-valent iron composite material can be prepared by adopting a ball milling method, the reaction condition is simple, operation is easy, and industrialization is convenient. The zero-valent iron composite material is applied to soil remediation, soil with pollutants being polybrominated diphenyl ethers and/or heavy metal and different pollution degrees can be treated and remedied, and the zero-valent iron composite material has good development prospects.