74results about How to "Enhanced electron transfer capability" patented technology

A photovoltaic cell includes carbon nanotubes formed by electrophoretic deposition. A separate carbon nanotube layer is stacked on a semiconductor layer by electrophoretic deposition, or a mixed layer of carbon nanotubes and a constituent material of a semiconductor layer is formed by electrophoretic deposition, thereby preventing damage to the carbon nanotubes. A method for fabricating the photovoltaic cell is also provided. Since superior electrical conductivity of the carbon nanotubes is maintained unchanged, the photovoltaic cell exhibits improved electron transfer performance and inhibits accumulation of electrons and occurrence of recombination reactions.

The invention discloses a nitrogen-doped activated carbon supported noble metal catalyst and an application thereof. The catalyst is composed of a carrier and an active component; the carrier is nitrogen-doped activated carbon; the active component is one of palladium, platinum, rhodium, ruthenium and iridium; and the load of the active component is not higher than 15wt% based on the mass of the carrier. The invention provides the application of the nitrogen-doped activated carbon supported noble metal catalyst to reaction for preparing an alkyl-containing halogenated aromatic aminocompound shown as a formula (II) by carrying out catalytic hydrogenation reduction on an alkyl-containing halogenated aromatic nitrocompound shown as a formula (I) to show that the nitrogen-doped activated carbon supported noble metal catalyst has the characteristics of high hydrogenation reaction rate, high catalytic activity, high selectivity and high stability.

Naphthalenetetracarboxylic acid diimide derivatives and an electrophotographic photoconductive material containing the naphthalenetetracarboxylic acid diimide derivatives. The naphthalenetetracarboxylic acid diimide derivatives have a structure represented by the following formula:

in which, R₁ and R₂ are each independently selected from the group consisting of a substituted or non-substituted C₁-C₂₀ alkyl group; a substituted or non-substituted C₁-C₂₀ alkoxy group; a substituted or non-substituted C₆-C₃₀ aryl group; and a substituted or non-substituted C₇-C₃₀ aralkyl group; and halogen. The electrophotographic photoconductive material includes the naphthalenetetracarboxylic acid diimide derivatives as an electron transferring material.

The invention discloses a catalyst for synthesis of methanol and formaldehyde through selective oxidation of methane. According to the invention, SiO2 modified by Nb and Ce is used as a carrier, and Mo and Sb are used as active components; in terms of the weight of the finished catalyst, Mo accounts for 5 to 11%, Sb accounts for 7 to 20%, Nb accounts for 1 to 3.5%, and Ce accounts for 1 to 3.5%, with the balance being SiO2. A preparation method for the catalyst used for synthesis of methanol and formaldehyde through selective oxidation of methane comprises the following steps: loading Nb and Ce by using an impregnation method so as to prepare SiO2 modified by Nb and Ce; then loading the active components--Sb and Mo; and finally, carrying out molding and screening so as to prepare the finished catalyst. The catalyst can be used for a selective oxidation reaction of methane for preparation of methanol and formaldehyde at a low pressure and has the advantages of a high methane conversion rate, high methanol and formaldehyde selectivity, etc.

The invention discloses a gold-doped carbon nitride composite material, a preparation method thereof and a methyl mercury detection method. The preparation method comprises the following steps: calcining a preparation raw material at high temperature to obtain a carbon nitride material, wherein the preparation raw material is one or more of cyanuric acid, melamine, ethylenediamine, graphite-phasecarbon nitride, dicyandiamide, urea and cyanamide; dissolving the carbon nitride material in deionized water, and carrying out ultrasonic oscillation, so that the carbon nitride material is stripped into a lamellar structure from a blocky structure to form g-C3N4 nanosheet turbid liquid; carrying out centrifugal separation on the g-C3N4 nanosheet turbid liquid, and taking out supernate after layering; adding a chloroauric acid solution into the supernate to form a mixed solution; stirring the mixed solution, and irradiating the mixed solution with ultraviolet rays to synthesize Au/g-C3N4 nanocomposite. According to the preparation method, the nanocomposite is prevented from being polluted, so that the electron transfer capability and the catalytic activity of the prepared gold-doped carbonnitride nanosheet composite material are improved.

The invention discloses a nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles, and a preparation method and application thereof, and relates to a preparation method of a porous carbon material. The invention aims to solve the problems that conventional methods for preparing porous carbon are tedious in operation steps, time-consuming, high in overpotential, high in equipment requirements and harmful to the environment, limit the preparation of the porous carbon material, are not suitable for large-scale production and cannot meet the new application requirements inthe fields of energy, catalysis, biology and the like. The nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles grows on foamed nickel in situ. The preparation method comprises the following steps: 1, pretreating the foamed nickel; 2, growing a cobalt-based zeolite imidazate framework structure material nanosheet array on the foamed nickel in situ; and 3, carrying outcalcining. The c nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles is used as a catalyst for hydrogen production through water electrolysis in the field of energy. The nickel-nitrogen co-doped porous carbon material loaded with cobalt nanoparticles can be obtained by using the method.

The invention discloses a nitrogen-doped graphene hollow sphere catalyst and a preparation method and application thereof. The nitrogen-doped graphene hollow sphere catalyst is formed by loading carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS) serving as a carrier, transition metal and transition metal oxide on the surfaces of the carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS); the preparation method comprises the following steps: preparing carbon nitride modified nitrogen-doped graphene hollow spheres (CNx-NGHS); and growing the transition metal/oxide nanoparticles on the surface of CNx-NGHS to prepare CNx-NGHS-loaded transition metal/oxide nanoparticles. The application of the nitrogen-doped graphene hollow sphere negative catalyst in catalyzing an oxygen reduction reaction (ORR) and an oxygen evolution reaction (OER) of a rechargeable zinc-air battery can significantly enhance the O2 molecular adsorption efficiency, improve the stability and the conductivity, and improve the stability and the electrical conductivity of the battery. The material has relatively low overpotential in ORR and OER reactions, and can meet the requirements of commercial application.

The invention discloses a porous biosensor and making and application methods. The porous biosensor is characterized by sequentially comprising a substrate, an electrode layer and a polymer film layer. A polymer film in a substrate electrode sensing region is removed, and the exposed substrate electrode region and the edge of the polymer film layer form a well-like structural region array; a zinc oxide coating with a porous structure is filled in each well-like structural region; and bioactive substance molecules with negative electricity are adsorbed in a porous zinc oxide structure under the action of static electricity, and a nano-scale narrow bottleneck structure is adopted between inner holes of each coating with the porous structure.

Naphthalenetetracarboxylic acid diimide derivatives include a structure represented by the following formula:

in which, R₁, R₂, and R₃ are each independently any one selected from the group consisting of hydrogen; halogen; substituted or unsubstituted alkyl of C₁ to C₂₀; substituted or unsubstituted alkoxy of C₁ to C₂₀; substituted or unsubstituted aryl of C₆ to C₃₀; and substituted or unsubstituted aralkyl of C₇ to C₃₀. An electrophotographic photoconductive material includes the naphthalenetetracarboxylic acid diimide derivatives as an electron transferring material.

The invention discloses an iron-based series amorphous alloy strip and a preparation method thereof and application in degradation of azo dye wastewater, and belongs to the technical field of azo dye-containing wastewater treatment. The iron-based series amorphous alloy strip is Fe(78-x)Si13B9Mx or Fe78Si(13-x)B9Mx, wherein M is Zr or Sn or P or V or Y, and x is larger than 0 and smaller than or equal to 3. The iron-based series amorphous strip has better corrosion resistance, higher catalytic activity, higher degradation efficiency and rate for azo dyes, and shows good comprehensive performance.

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 a preparation method of a magnetic oxygen deficient cobalt ferrite bimetal oxide composite catalyst. In the preparation method provided by the invention, an oxygen vacancy is introduced into CoFe2O4(CFO) with a hydrogen reduction method to prepare oxygen deficient CoFe2O4(HCFO), so that the electron transfer capacity of the catalyst is improved, and the amount of catalyticsites is increased; the catalytic activity of the catalyst is strengthened through the synergistic effect of the oxygen vacancy and transition metal; and the oxygen deficient CoFe2O4(HCFO) can effectively activate persulfate to produce a great quantity of free radicals to degrade organic matters which are difficult to degrade in water. The prepared magnetic oxygen deficient cobalt ferrite bimetaloxide composite catalyst has very strong magnetism, can realize recovery utilization of the catalyst and reduces secondary pollution.

The invention discloses a method for degrading organic pollutants by activating persulfate with a multi-stage mesoporous biochar material. The method adopts the multi-stage mesoporous biochar materialand persulfate to treat organic pollutants, wherein the multi-stage mesoporous biochar material is prepared by taking bagasse as a raw material, mixing the bagasse with calcium chloride and potassiumhydroxide and then calcining. According to the method for degrading the organic pollutants by activating the persulfate through the multistage mesoporous biochar material, the organic pollutants canbe effectively removed, and the method has the advantages of being easy to operate, short in period, low in cost, high in degradation efficiency, good in removal effect, high in anti-interference capacity, wide in application range, easy to recycle and reuse and the like. The method has a good application prospect in actual treatment of organic pollutant wastewater and natural water and soil polluted by organic pollutants.

The invention discloses a preparation method of a heterogeneous photo-Fenton catalyzing material. The method comprises the following steps: preparing graphene oxide for later use; loading Fe3O4 and CuO together to the prepared graphene oxide; and preparing a hollow core-shell structure based on the loaded graphene oxide, thus obtaining the core-shell structure heterogeneous photo-Fenton catalyzingmaterial Fe3O4-CuO-GO@void@TiO2NPs. With the adoption of the catalyzing material prepared through the material, the problems of small pH acting range, low recycling performance, and easy causing of secondary pollution can be overcome; and moreover, the defects that activated catalyzing nanoparticles are easily agglomerated can be solved.

The invention belongs to the technical field of solid catalysts for activating persulfate, and particularly discloses a preparation method of a carbon cloth loaded nitrogen-doped graphene material, which comprises the following steps of (1) dispersing a nitrogen source into an organic solvent, adding non-noble metal-MOF nanoparticles as a precursor, and stirring and mixing at 60 DEG C to obtain acompound dispersion liquid, wherein the mass ratio of the nitrogen source to the non-noble metal-MOF is (1-20): 1, and (2) dropwise adding the compound dispersion liquid onto the acidified carbon cloth, and pyrolyzing to obtain the carbon cloth loaded nitrogen-doped graphene material. According to the preparation method, sacrificial elements and noble metals are not adopted, carbon cloth is takenas a substrate, and a self-assembled compound of non-noble metal MOF and a nitrogen source is pyrolyzed, so that the active nitrogen component in the catalyst is improved, the catalytic degradation performance is improved, and the material has good catalytic activity and stability. The invention also discloses an application of the material as a catalyst for activating persulfate.

The invention belongs to the field of optoelectronic materials and discloses a metalloporphyrin-thienothiadiazole organic semiconductor material and a preparation method and application thereof. The metalloporphyrin-thienothiadiazole organic semiconductor material has a structural formula (P) shown in the specification, wherein in the formula, n is an integer from 1 to 100; R1, R2, R3 and R4 are H, C1-C32 alkyl, phenyl and alkylbenzene or alkoxy benzene containing one or more C1-C32; and M is a metal ion. The metalloporphyrin-thienothiadiazole organic semiconductor material has good film-forming property, strong absorbance and wide light absorption range, thus improving the sunlight use ratio of the material. The material also has better heat stability and environmental stability. Besides, the preparation method is simple in process and easy to operate and control.

The invention discloses a lanthanum-doped copper-manganese composite oxide catalyst and a preparation method thereof. In the XRD diffraction spectrum of the catalyst, a diffraction peak of Cu1.5Mn1.5O4 spinel phase is contained, and no diffraction peaks of La and Mn2O3 are contained; in the XPS Cu 2p spectrum of the catalyst, two peaks at 933.3+/-0.1 eV and 930.5+/-0.1 eV are contained. More reactive oxygen and more active oxygen transport channels are resulted from existence of Cu1.5Mn1.5O4 and weak crystallization of MnOx, and the catalytic performance of the copper-manganese composite oxidecatalyst for VOCs can be improved further through La. The preparation method comprises the following steps: (1) dissolving a manganese salt, a copper salt and a lanthanum salt in water, carrying outwater bath for 0.1-1 h with a water bath temperature at 50-70 DEG C; (2) adding an ammonium salt solution to a pH value of 7.5-8.5, and keeping stirring for 1-3 hours; and (3) taking the precipitate,and then performing drying and sintering so as to obtain the lanthanum-doped copper-manganese composite oxide catalyst. The preparation method of the lanthanum-doped copper-manganese composite oxide catalyst has a simple process, easy control and volume production.

The invention discloses a preparation method for an organic-inorganic composite nanometer photocatalyst. According to the invention, with nitro-substituted phthalonitrile and p-hydroxybenzoic acid asraw materials, 4-carboxyl phenoxy substituted metal phthalocyanine is prepared through a two-step reaction, and metal phthalocyanine, graphene oxide and molybdenum disulfide are compounded to obtain ametal phthalocyanine, graphene and molybdenum disulfide ternary composite photocatalyst. According to the invention, p-carboxyl phenoxy is introduced onto a branched chain of the metal phthalocyanine, so the solubility of the metal phthalocyanine can be effectively improved, and the dispersion capability of the metal phthalocyanine serving as a photocatalyst in a reaction system is improved; themetal phthalocyanine, the graphene and the molybdenum disulfide are compounded to form the organic-inorganic composite nanometer photocatalyst, and through the synergistic effect of three components,the light absorption capacity is improved, and the light absorption range is widened; meanwhile, the active sites of the catalyst can be easily increased, and the catalytic activity is improved.

The invention discloses application of a molybdenum carbide-dispersed copper oxide-titanium trisulfide catalyst to catalytic hydrogenation of tetrahydrofurfuryl alcohol to prepare 1,5-pentanediol. According to the method, copper oxide is used as an active component, one or more modification metals selected from iron, cobalt, nickel, zinc, chromium and vanadium are used for modifying the active component, titanium trisulfide is used as a cocatalyst, a composite component is loaded on a molybdenum carbide carrier, and the formed catalyst is applied to catalytic conversion of tetrahydrofurfuryl alcohol to prepare 1,5-pentanediol. According to the method, the catalyst is prepared from non-noble metal, so cost is low, and stability is good.

The invention belongs to the field of chemical analysis and detection, provides a three-dimensional porous carbon/polythionine compound modified electrode and a production method thereof, and also provides an electrochemical detection method based on the electrode. The three-dimensional porous carbon/polythionine compound modified electrode includes a base electrode, a polythionine coating and a three-dimensional porous carbon coating, the external surface of the base electrode is wrapped with the polythionine coating, and the external surface of the polythionine coating is wrapped with the three-dimensional porous carbon coating to form the three-dimensional porous carbon/polysulfide composite modified electrode. The three-dimensional porous carbon/polythionine compound modified electrodehas good electron transfer ability and can improve the reaction rate of the electrode, the production method has the advantages of simplicity, easiness in implementation, and low cost, and the electrochemical detection method based on the electrode has the advantages of simplicity in operation, good selectivity and high sensitivity.

The invention relates to a preparation method of a polymer conversion ceramic-based wave-absorbing material loaded with nitrogen-doped graphene in situ. An organic nitrogen source reacts with a silicon-based polymer to generate a single-source precursor, and cracking and high-temperature heat treatment are carried out to enable the precursor to be self-assembled to generate the material. The single-source precursor is synthesized in one step through an organic chemical modification method, and the nitrogen-doped graphene-loaded polymer converted ceramic (NG-PDCs)-based composite material with excellent wave-absorbing performance is obtained through high-temperature cracking. The nitrogen-doped graphene loaded composite ceramic is converted from a synthesized single-source precursor, wherein nitrogen-doped graphene is uniformly distributed in polymer conversion ceramic. The NG with more excellent wave-absorbing performance is introduced in one step through chemical combination, so that the defects that preparation is tedious and the structure is prone to agglomeration due to the fact that graphene is added in a traditional method are overcome, and the wave-absorbing performance of the PDCs material is improved.

The invention relates to a method for degrading sulfamethoxazole by using biochar to activate bicarbonate peroxide. The method adopts four types of biochar to degrade sulfamethoxazole in a water body, and the biochar is prepared by pyrolyzing sawdust, wheat straw, corn straw and bamboo as raw materials at 500 DEG C. According to the method disclosed by the invention, the sulfamethoxazole is treated by adopting the biochar to activate the bicarbonate peroxide, so that the sulfamethoxazole can be effectively treated, and the method has the advantages of simplicity in preparation, low cost, strong catalytic performance, strong anti-interference capability, good dispersity, strong stability and easiness in recycling and reutilization, and has a good application prospect in a water body polluted by sulfamethoxazole.

The invention provides a nitrogen-doped carbon-loaded palladium catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the nitrogen-doped carbon-loaded palladium catalyst comprises the following steps: mixing a carbon material and a strong acid solution, and carrying out acid treatment to obtain an acid-activated carbon material; mixing the acid activated carbon material, a water-soluble palladium salt solution and a nitrogen-containing ionic liquid, and drying the material to obtain a catalyst precursor; and calcining the catalyst precursor in a protective atmosphere, and reducing to obtain the nitrogen-doped carbon-loaded palladium catalyst. In the method, the acid treatment can increase the number of oxygen-containing functional groups on the surface of the carbon material and improve the dispersion stability of palladium nanoparticles; secondly, the nitrogen-containing ionic liquid is used as a precursor of nitrogen, nitrogen atoms generated by decomposition in the calcining process are doped, so that nitrogen can be uniformly doped in the carbon material, meanwhile, the dispersity and the stability of palladium nanoparticles are improved, and the catalytic activity is high. The preparation method is simple in process and suitable for industrial production.

The invention discloses a method for enhancing the electron transfer capacity of humic acid to promote anaerobic fermentation and acid production of sludge, and belongs to the field of sludge treatment. Humic acid in a sludge hydrolysate is subjected to catalytic reduction through Pd-C/H2, so that the electron transfer capacity of the humic acid is enhanced, the function of the humic acid as an electron intermediate or an anaerobic respiration electron acceptor in a sludge anaerobic fermentation system is enhanced, and by improving electron transfer between a sludge substrate and functional microorganisms, the conversion rate of sludge organic matter is improved. The modified humic acid can increase the yield of volatile fatty acid in the anaerobic fermentation process by 30-50%. According to the method, 100% of the Pd-C catalyst can be recycled, the cost is low, the efficiency is high, the method is a novel method and thought for improving the yield of volatile fatty acid in the anaerobic fermentation process of the sludge, sludge reduction and resource utilization are integrated, and the method has high application value.

The invention discloses a preparation method of a cerium oxide modified biomimetic catalyst, wherein a nickel source is added in the growth process of Eichhornia crassipes, the Eichhornia crassipes absorbs nickel elements, and pyrolyzes the nickel elements, and then the nickel elements and a cerium compound are subjected to precipitation reaction under the action of sodium hydroxide, and biochar containing precipitate cerium oxide generated by the reaction is calcined at high temperature to prepare the biomimetic catalyst. The preparation method is simple, the prepared biomimetic catalyst contains the nickel element and the cerium oxide, and the nickel element and the cerium oxide are uniformly dispersed in the biochar, so that the electron transfer capability in the biomimetic catalyst is promoted, the removal rate of organic pollutants is improved, and the reliability and durability of the biomimetic catalyst as an environmental remediation material are further improved; and a new development thought is provided for preparation of the catalyst or the biomimetic catalyst.

The invention relates to the technical field of electrochemical analysis and detection, in particular to a modified glassy carbon electrode for detecting dopamine and adrenaline simultaneously, a preparation method and application thereof. The electrode has advantages of large specific surface area, high catalytic activity, and high electrical conductivity and is capable of measuring the dopamine and adrenaline simultaneously and distinguishing potentials accurately. The modified glassy carbon electrode comprises a glassy carbon electrode and a composite coating; and the composite coating is wrapped on the surface of the glassy carbon electrode and is formed by composition of graphene oxide and tetrabromofluorescein. In addition, the preparation method comprises the following steps: (1), preparing a tetrabromofluorescein solution; (2), preparing a graphene oxide dispersion solution; and (3), making a modified electrode. Besides, the application includes: S1, establishing a concentration-electrochemical response signal relationship; S2, measuring the concentration of a to-be-detected substance.