104 results about "Palladium nanoparticles" patented technology

A method of carbon dioxide fixation includes contacting a covalent organic framework material with a co-catalyst and an epoxide in the presence of carbon dioxide to form a cyclic carbonate. The covalent organic framework material includes reacted units of a 2,4,6-trimethyl-1,3,5-triazine, reacted units of a 4,4′-biphenyldicarbaldehyde, and palladium nanoparticles. The reacted units of the 2,4,6-trimethyl-1,3,5-triazine and the reacted units of the 4,4′-biphenyldicarbaldehyde form a COF-701, where the palladium nanoparticles are on an outer surface of the COF-701. The co-catalyst is n-tetrabutylammonium bromide.

The application belongs to the technical field of sensitive materials, and discloses a high-performance TiO2@In2O3 / Pd sensitive film for a MEMS gas sensor, a synthesis method thereof and a MEMS gas sensor. The method comprises the following steps: synthesizing mesoporous TiO2 nanoparticle balls; mixing indium salt, an alkaline compound, a surfactant and the mesoporous TiO2 nanoparticle balls uniformly, and then performing hydrothermal reaction; centrifuging, washing and drying the product of the hydrothermal reaction, and then performing first annealing treatment in an air atmosphere to obtain In2O3-coated titanium dioxide nanoparticle balls TiO2@In2O3; modifying palladium nanoparticles to the nanoparticle balls TiO2@In2O3 by a solution method, centrifuging, washing and drying, and then performing second annealing treatment in a hydrogen atmosphere to obtain In2O3-coated titanium dioxide nanoparticle balls TiO2@In2O3 / Pd with Pd modification; and manufacturing the nanoparticle balls TiO2@In2O3 / Pd into a sensitive film. The sensitive film manufactured by the above method can improve the sensitivity of gas detection.

The invention discloses a Pd supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The Pd supported catalyst is prepared according to the following steps: dissolving TEOS and MSDS in absolute ethyl alcohol, stirring, adjusting the pH value, aging at room temperature, and drying to obtain a mixture; and extruding the mixture into a long strip shape, calcining to prepare a TiO2-SiO2 composite carrier, dipping the TiO2-SiO2 composite carrier in a palladium nanoparticle solution, filtering, washing, and drying in vacuum to obtain the catalyst. The preparation method is simple and green in process, the reaction process is safe and easy to control, the prepared Pd supported catalyst is good in crystallization, high-dispersion nano-particle morphology, uniform in size and uniform in dispersion, and when the Pd supported catalyst is applied to co-production of methyl isobutyl ketone and methyl isoamyl ketone from mixed aldehyde and ketone, the isobutyraldehyde conversion rate can be effectively increased, and the yield of methyl isobutyl ketone and methyl isoamyl ketone can be effectively increased. The selectivity on methyl isoamyl ketone is good, and organic impurities in the product are few.

The invention belongs to the technical field of conductive materials, and particularly relates to a method for preparing and activating pyridine functionalized swelling polymer microspheres and a method for preparing core-shell structure polymer conductive microspheres. The preparation method comprises the following steps: by taking polystyrene microspheres as seeds, preparing pyridine functionalized polymer microspheres through an emulsion swelling method, then introducing Pd < 2 + > ions through coordination, preparing activated microspheres with palladium nanoparticles uniformly coated on the surfaces of the polymer microspheres through in-situ reduction, preparing nickel-plated microspheres with uniform metal coatings through chemical plating, and finally preparing the polymer microspheres with uniform metal coatings. And finally, preparing the core-shell structure gold-plated polymer conductive microspheres through in-situ reduction, and applying the core-shell structure gold-plated polymer conductive microspheres to preparation of anisotropic conductive films. Through an emulsion swelling method, not only can the polymer microspheres with adjustable sizes be prepared, but also the polymer microspheres with different morphologies can be prepared. The preparation method of the conductive microspheres has the advantages of being wide in raw material source, easy and convenient to operate and adjustable in metal coating thickness, and is suitable for high-precision packaging in the microelectronic industry.

The application provides a preparation method of a metal-functionalized graphene film, and belongs to the technical field of nanofluid mass transfer. The preparation method comprises the following steps: firstly, dispersing a palladium precursor and graphene oxide in an alcohol solvent, and growing palladium nanoparticles on the surface of the graphene oxide in situ through first heating to obtain a first dispersion liquid comprising graphene oxide loaded with the palladium nanoparticles; then adding deionized water and a reducing agent to the first dispersion liquid, stirring and performing second heating, so that the graphene oxide in the first dispersion liquid is reduced to reduced graphene oxide to obtain a second dispersion liquid comprising reduced graphene oxide loaded with the palladium nanoparticles; and finally, preparing a film from the second dispersion liquid to obtain the metal-functionalized graphene film. In other aspects of the application, a metal-functionalized graphene film obtained by the aforementioned preparation method and an application of the metal-functionalized graphene film in an electrically controlled ion separation device are also provided.

The application belongs to the technical field of wastewater treatment, and provides an electrochemical anode-cathode combined system, wherein a diaphragm divides an electrolytic cell into an anode chamber and a cathode chamber, the anode chamber is provided with a counter electrode and filled with activated carbon, the cathode chamber is provided with a working electrode and a reference electrode, the working electrode comprises a conductive base and a modified electroactive biofilm arranged on the surface of the conductive base, and the modified electroactive biofilm comprises an electroactive biofilm and palladium nanoparticles loaded on the electroactive biofilm.In the application, H* generated on the surface of the palladium nanoparticles on the electroactive biofilm can attack the carbon-halogen bond in PFASs, meanwhile, the electroactive biofilm can reduce nitrate by using electrode electrons, and then the activated carbon particles passing through the anode can be adsorbed and further purified and filtered, so that the electrochemical anode-cathode combined system provided by the application can effectively remove perfluoro / polyfluoroalkyl compounds and nitrate in wastewater at the same time.

The invention belongs to the technical field of hydrogen sensors, and particularly relates to a palladium nanoparticle-graphene composite structure, a preparation method and application thereof and a hydrogen sensor. The preparation method comprises the following steps: plating a palladium nano-film on a substrate coated with a graphene film, and then sequentially carrying out heat treatment and activation treatment, or plating a palladium nano-film on a polymer microsphere array on the surface of a graphene composite film, and then carrying out heat treatment; or plating a palladium nano film on the polymer microsphere array on the surface of the graphene composite film, and then sequentially carrying out heat treatment and activating treatment to obtain the palladium nano particle-graphene composite structure. The palladium nanoparticle-graphene composite structure has high sensitivity, selectivity, recovery speed and repeatability on hydrogen detection under the action of dual mechanisms of optimizing a hydrogen diffusion path by an oxygen-containing group on a contact interface of the graphene film and the palladium nanoparticles and improving hydrogen diffusion efficiency by the palladium nanoparticles with high coverage rate; the detection of ppb-grade hydrogen can be realized at room temperature, the accuracy is high, and the safety is good.

The invention provides a nano array for exposing a SnO2 high-activity crystal face, a preparation method of the nano array and application of the nano array in hydrogen sensing. The preparation method of the Pd-SnO2 nanowire array comprises the following steps: (1) synthesizing a SnO2 nano array on the surface of a substrate; and (2) loading the Pd nano particles on the SnO2 nano array, so as to obtain the Pd-SnO2 nanowire array. The palladium nanoparticle-loaded SnO2 nanowire array can rapidly and sensitively detect hydrogen under a low-temperature condition, has excellent sensitivity, shows excellent selectivity and reliable stability, has a detection lower limit reaching a ppm level, and is high in response speed and good in reproducibility. When the palladium nanoparticle loaded SnO2 nanowire array is used for preparing a hydrogen sensing device, the energy consumption is reduced, and the hydrogen sensing device is safer and more environment-friendly.

The invention belongs to the technical field of preparation of supported noble metal catalysts, relates to a palladium-carbon catalyst, and discloses a high-dispersion zero-valent palladium nanoparticle carbon-based catalyst and a preparation method thereof. The Pd / C catalyst comprises a main active component, a stabilizer and a carrier, the main active component is Pd, and the stabilizer is PVA (polyvinyl alcohol); the carrier is mesoporous active carbon; wherein in the palladium nano-particle carbon-based catalyst, the loading amount of Pd is 5.5-6.5 wt.% in terms of the mass sum of Pd and a carrier being 100%. According to the preparation method, PVA is adopted as a stabilizer, palladium nanoparticles are fixed on mesoporous activated carbon in a colloid form, agglomeration of the palladium nanoparticles in the heating reduction process is effectively avoided, and the stability of metal is improved; mesoporous activated carbon with high pore volume and high mesopore ratio is selected, so that the distribution space of the main active component Pd in mesopore channels is wider, and the dispersity of the active component Pd is further improved.

The invention belongs to the technical field of nano-catalyst antibiosis, and particularly relates to a zinc-based nitrogen-doped carbon-loaded metal palladium nano-enzyme as well as a preparation method and application thereof. The ZnNC-loaded metal palladium nano-enzyme is prepared by adopting a deposition-precipitation method which is simple to operate, taking ZnNC as a carrier and taking metal palladium nano-particles as an active center. The nano-enzyme has excellent oxidase-like activity, can catalyze O2 to generate hydroxyl free radicals (. OH), singlet oxygen (< 1 > O2) and superoxide anion free radicals (O2 <->) so as to kill bacteria and achieve an antibacterial effect, and has a remarkable antibacterial effect on escherichia coli under an acidic condition.

The invention provides a palladium-based catalyst as well as a preparation method and application thereof. The palladium-based catalyst comprises a carrier and active components loaded on the carrier, the active components comprise metal Pd, metal Au and alkali metal acetate, the metal Pd contains Pd nano-particles with the average diameter being smaller than 5 nm, and the Pd nano-particles with the average diameter being smaller than 5 nm account for 1%-20% of the total weight of the metal Pd. The method for preparing the palladium-based catalyst comprises the following steps: (1) dipping a carrier loaded with metal Pd (0) and metal Au (0) in a nano-palladium dispersion liquid to obtain a catalyst precursor IV; and (2) dipping the catalyst precursor IV in a solution containing alkali metal acetate to obtain the palladium-based catalyst. The palladium-based catalyst provided by the invention has excellent catalytic activity and selectivity in a vinyl acetate preparation reaction.

This invention belongs to the field of catalyst materials technology, specifically relating to a Pd-UiO-66 particle electrode, its preparation method, and its application. The Pd-UiO-66 particle electrode uses a zirconium-based metal-organic framework UiO66 as a support. Palladium nanoparticles are obtained by reducing palladium salts with sodium borohydride. The palladium nanoparticles are then reacted with the hydroxyl groups on the polyvinyl alcohol molecules. 2+ The coordination between the components and the steric hindrance effect of the long-chain molecules of polyvinyl alcohol regulate the dispersion of palladium nanoparticles, allowing palladium nanoparticles to be loaded onto UiO66 to obtain Pd-UiO-66. The Pd-UiO-66 particle cathode in this invention avoids the aggregation of palladium nanoparticles, greatly increasing the electrode area / solution volume ratio and helping to provide more active sites for dechlorination.

The invention relates to a nitrogen-rich acylhydrazone covalent organic framework material as well as a preparation method and application thereof, 5 '-(4-(hydrazinocarbonyl)-3-methoxyphenyl)-3, 3'-dimethoxy-[1, 1 ': 3', 1 '-terphenyl]-4, 4'-dicarboxylic acid dihydrazide, 1, 3, 5-tri (2-formyl pyridine-5-yl) benzene and 4, 4 ', 4' '-(1, 3, 5-triazine-2, 4, 6-triyl) tribenzaldehyde are used as construction units, and the nitrogen-rich acylhydrazone covalent organic framework material is prepared by a one-step method. The compound is synthesized by Schiff base reaction. The nitrogen-rich acylhydrazone covalent organic framework material disclosed by the invention has good chemical stability and can be used as a carrier to load palladium nanoparticles through metal coordination to obtain a composite material, and the composite material shows excellent catalytic activity and substrate universality in catalysis of Heck reaction; the method has potential application value in the fields of biological medicine, green chemistry and the like.

This invention provides a hydrogen sensor based on nanoparticles, its preparation method, and its application, belonging to the field of hydrogen sensor technology. The nanoparticle-based hydrogen sensor provided by this invention includes a substrate and at least one pair of electrodes spaced apart on the surface of the substrate. The substrate surface between the electrodes is covered with nanoparticles, and the electrode surfaces and nanoparticle surfaces are covered with a thin film layer. The nanoparticles include one or more of palladium nanoparticles, platinum nanoparticles, and alloy nanoparticles, wherein the alloy nanoparticles contain palladium and / or platinum. The material of the thin film layer includes one or more of polymethyl methacrylate, naphthol, silica, alumina, polytetrafluoroethylene, diamond-like carbon film, silicon nitride, and silicon carbide. The nanoparticle-based hydrogen sensor provided by this invention has high sensitivity and excellent stability, enabling rapid and accurate determination of hydrogen in an air environment.

This invention relates to the field of catalyst technology, and discloses a catalyst for the preparation of chloroaromatic amines, comprising palladium-based nanomaterials co-modified with an organophosphorus ligand and a metavanadate. The palladium-based nanomaterials consist of palladium nanoparticles and a carbon support. The palladium nanoparticles include zero-valent palladium and positive-valent palladium. Phosphorus in the organophosphorus ligand forms a palladium-phosphorus coordination bond with the zero-valent palladium, and metavanadate ions in the metavanadate form a vanadium-oxygen-palladium chemical bond with the positive-valent palladium. The catalyst provided by this invention exhibits high conversion and high selectivity in the catalytic hydrogenation of chloronitroaromatic hydrocarbons to prepare chloroaromatic amines, with virtually no formation of byproducts such as chlorohydroxyaromatic amines, azo compounds, and dechlorination products, and the reaction conditions are mild.

The invention relates to a nano MoS2 and PtPd combined BN / Au film sensor as well as a preparation method and application thereof, and belongs to the technical field of biosensors. According to the sensor, a glassy carbon electrode serves as a substrate, a boron nitride nanosheet, a gold film and a primary antibody are sequentially modified, a molybdenum disulfide composite material loaded with platinum-palladium nanoparticles and a secondary antibody are coupled to serve as a signal amplification probe, and thionine serves as an electron mediator. The preparation method comprises the steps of electrode pretreatment, BN / Au film modification, antibody fixation, nano composite probe preparation and the like. The sensor solves the problems that an existing detection method is complex in operation, depends on large-scale equipment and is difficult to meet POCT requirements, has the advantages of being high in sensitivity (the detection limit reaches 0.86 pg / mL), high in specificity, good in stability and suitable for rapid detection of serum samples, and provides an effective tool for early diagnosis of tumors.

A method for producing a nano-Pd catalyst supported on a nitrogen-doped hierarchical porous carbon, characterized in that it comprises: 1) Preparation of a nitrogen-doped hierarchical porous carbon, 2) Mixing the nitrogen-doped hierarchical porous carbon produced in step 1) with water and adjusting the pH of the mixed solution to alkaline. 3) Mixing the mixture solution prepared in step 2) with the aqueous solution of Pd metal precursors, adding reducing agent and obtaining the nano-Pd catalyst supported on the nitrogen-doped hierarchical porous carbon after reduction.

This invention relates to the field of trace gas leak detection, specifically to a highly sensitive and fast-response hydrogen sensor based on palladium single-atom doping, its preparation method, and its application. The method includes the following steps: preparing indium hydroxide material using indium ions, anhydrous ethanol, ammonia, and deionized water; then doping palladium ions into the indium hydroxide solution to obtain a palladium ion-doped indium hydroxide solution; reducing the solution with sodium borohydride; centrifuging to obtain palladium cluster-doped indium hydroxide material; subsequently calcining the palladium cluster-doped indium hydroxide composite material at high temperature to obtain a palladium single-atom-doped indium oxide composite material; and finally transferring the palladium single-atom-doped indium oxide onto an electrode substrate surface to obtain the hydrogen sensor. This invention, through improvements to key processes, effectively solves the problems of poor selectivity in pure indium oxide gas sensors and slow response speed in palladium nanoparticle-doped hydrogen sensors, achieving rapid and highly sensitive trace detection of hydrogen.

The invention belongs to the technical field of catalysis, and discloses an oxide-nitrogen-containing intrinsic microporous polymer nano composite carrier supported palladium catalyst as well as a preparation method and application thereof. The catalyst takes an inorganic nano oxide as a matrix, nitrogen-containing intrinsic microporous macromolecules are deposited on the surface of the matrix to form a composite carrier with a dual-distribution pore structure, the inorganic oxide provides macropores, and the macromolecules provide micropores; the nitrogen-containing intrinsic microporous polymer contains a tertiary amine structural unit, and nitrogen atoms of the tertiary amine structural unit are coordinated with palladium nanoparticles, so that anchoring and high dispersion of palladium are realized. The preparation method of the catalyst comprises the following steps: firstly synthesizing a nitrogen-containing intrinsic microporous polymer, then compounding the nitrogen-containing intrinsic microporous polymer with an oxide to prepare a carrier, and finally loading a palladium precursor and performing hydrogen reduction. The catalyst shows high conversion rate, high selectivity and excellent cycle stability in styrene oxide hydrogenation, acrylonitrile hydrogenation and phenylacetylene hydrogenation reactions, the preparation process is simple and convenient, and the catalyst has a good industrial application prospect.

The application discloses a ligand modified Pd / C catalyst, a preparation method thereof and application of the catalyst in selective hydrogenation of nitrogen-containing alkyne, and the catalyst comprises a porous carbon carrier, palladium nanoparticles loaded on the carrier and organic ligands coordinated on the surface of the catalyst, the mass of the palladium nanoparticles is 0.5-2% of the mass of the porous carbon carrier, the organic ligands are selected from at least one of oxalic aniline, L-lysine, ethylenediaminetetraacetic acid and oleylamine, and the molar ratio of the organic ligands to palladium is 1-8:1. When the catalyst is applied to catalyzing semi-hydrogenation of 3-ethynylquinoline to prepare 3-vinylquinoline, the selectivity of the target product is as high as 97%, and the conversion rate of the reaction is 99%. In addition, under the same conditions, when thiophene is added into the system, the catalyst still has excellent sulfur poisoning resistance.

The application provides a resource treatment method of waste palladium catalyst. The method first carries out microwave carbon removal, plasma etching and N-TiO2 light catalyst loading on the waste palladium catalyst to complete carrier loosening modification; then in a supercritical extraction kettle with an embedded ultraviolet LED lamp, a gradient strategy of 'weak complexing agent pre-washing impurity removal + strong complexing agent main palladium extraction' is adopted, combined with light catalysis-super critical synergistic effect to strengthen palladium desorption and selective extraction; then the impurity metal and weak complexing agent are recovered through reduced pressure condensation, and the palladium complex fluid is purified through a silica gel adsorption column; then the purified fluid is introduced into a loading kettle to mix with a carrier precursor suspension, hydrogen is introduced for in-situ reduction, and palladium nanoparticles are loaded, and a palladium-based catalyst applicable to industrial application is directly obtained through drying and calcination; finally, the waste carrier is microwave activated (active carbon carrier is additionally steam activated) to realize deep reuse.

The invention relates to a preparation method of an electrochemical sensor for starch detection, the electrochemical sensor and application, and the method comprises the following steps: patterning the surface of a polyimide film through a laser system to prepare three graphene electrodes; transferring the graphene three-electrode to the surface of the polycaprolactone to obtain a formed polycaprolactone-graphene three-electrode; coating Ag / AgCl silver paste on a reference electrode area in the polycaprolactone-graphene three-electrode, heating and curing, then insulating and packaging outside the three-electrode area, and activating the electrode; the electrochemical sensor for starch detection is obtained by modifying a carbon nanocage, platinum-palladium nanoparticles and glucoamylase layer by layer in a working electrode area. The prepared polycaprolactone degradable electrode can realize environment-friendly detection of starch, the degradable electrode material is soft and bendable, the starch content of various tissue parts of a plant can be detected, and the problems that an existing sensor is difficult to be effectively attached to the plant to be detected and environmental pollution is caused are effectively solved.

The invention relates to the technical field of immunosensors, in particular to a CeO2-Pd NPs composite material, an immunosensor, a preparation method and application. The preparation method of the CeO2-Pd NPs composite material comprises the following steps: dissolving cerium salt and a polyvinylpyrrolidone solution in an organic solvent, adding an inorganic solvent, and carrying out a second heating reaction to obtain cerium dioxide; dissolving potassium salt, L-ascorbic acid and polyvinylpyrrolidone in an inorganic solvent, carrying out a third heating reaction, adding a palladium salt solution, and continuing the third heating reaction to obtain Pd NPs, namely palladium nanoparticles; the preparation method comprises the following steps: dispersing cerium dioxide in an inorganic solvent, and adding Pd NPs to obtain a CeO2-Pd NPs composite material; the invention also provides the CeO2-Pd NPs composite material prepared by the method, an immunosensor and a preparation method. The problem that an existing sensor is low in sensitivity when used for detecting DBP is solved.

The invention provides a preparation method of a foam metal composite hydrogen storage material, which comprises the following steps: mixing vanadium-containing alloy powder, a pore-forming agent and an organic binder, carrying out compression molding, and carrying out heat treatment to densify the alloy so as to obtain an inner-layer pressure-bearing framework; depositing a magnesium-titanium nano composite layer through a magnetron co-sputtering technology; growing a graphene layer through chemical vapor deposition; immersing the framework on which the graphene layer grows into a solution containing palladium salt, and generating and loading palladium nanoparticles on the surface of graphene in situ to form a surface catalyst layer, so as to obtain a metal foam framework; and immersing in a solution containing zircon salt and an organic ligand, and growing a metal organic framework on the surface in situ through solvothermal reaction to obtain the foam metal composite hydrogen storage material. The mechanical strength, the hydrogen storage capacity and the dynamic performance of the material are improved, the stability of the material in hydrogen absorption and desorption circulation is improved, and the defects of a traditional hydrogen storage material in the aspects of mechanical performance, hydrogen storage efficiency, circulation stability and the like are overcome.

This invention discloses a palladium-based catalyst for the semi-hydrogenation of alkynols to enols and its preparation method. Specifically, a metal salt is added to deionized water and ultrasonically dispersed to obtain a uniformly dispersed metal salt solution. A support powder is uniformly spread on a polytetrafluoroethylene plate. The metal salt solution is loaded into a syringe pump and slowly added dropwise onto the support. The solution is allowed to stand and age to obtain a wet support. The wet support is transferred to an oven for calcination. The calcined sample is transferred to a tube furnace for reduction to obtain the palladium-based catalyst. The palladium-based catalyst of this invention can be applied to the selective hydrogenation reaction of alkynols. By controlling the impregnation rate, the active precursor solution is ensured to be absorbed instantaneously and completely, and the enrichment of the active component at the edges is effectively suppressed. High-temperature reduction achieves partial encapsulation of palladium nanoparticles with indium oxide, thereby altering their electronic structure and improving the selectivity for the semi-hydrogenation of alkynols to enols.

This invention relates to the field of hydrogen detection technology, and in particular to a low-concentration hydrogen detector and detection method based on a nano-palladium-nickel alloy, which can achieve high sensitivity and rapid response for detecting low-concentration hydrogen at room temperature. The detector includes: a nano-sensitive chip module with a palladium-nickel alloy-based nano-sensitive thin film, wherein the nano-sensitive thin film has a suspended micro / nano waveguide structure, and hydrogen is adsorbed and converted into a resistance change signal based on the surface scattering effect of the suspended micro / nano waveguide structure; a signal modulation circuit electrically connected to the nano-sensitive chip module, used to convert the resistance change signal into a differential voltage signal; and an intelligent calculation module electrically connected to the signal modulation circuit, used to perform inversion calculation on the differential voltage signal and output the hydrogen concentration value.

The invention relates to the technical field of gas sensors, in particular to a hydrogen sensor for lithium battery safety monitoring and a sensitive material preparation method, and aims at solving the problems that an existing hydrogen sensitive material is low in recovery speed and insufficient in sensitivity. Tungsten trioxide is adopted as a matrix of the sensitive material, compared with common materials such as tin oxide and zinc oxide, the sensitive material has the response characteristic of being more sensitive to hydrogen, the intrinsic sensitivity and the reaction rate of the material to hydrogen are improved through the synergistic dual sensitization effect of K + bulk phase doping and palladium nanoparticle surface catalysis, and the sensitivity of the material to hydrogen is improved. A sacrificial template is introduced into a tungsten trioxide sensitive layer prepared by aerosol deposition, and a segmented annealing process is adopted, so that a controllable porous structure is constructed while sufficient removal of the template and film continuity are ensured, and the sensitivity and response / recovery performance of the hydrogen sensor are improved; the sensor is suitable for lithium ion battery thermal runaway safety monitoring scenes with extremely harsh early warning requirements.

The application belongs to the field of photoelectrocatalysis, and relates to a non-biased hydrogen peroxide and C3 chemical co-production device based on a Pd-CuO / W-CuBi2O4 photo-cathode and application thereof. The application constructs a heterojunction photo-cathode composed of CuO and tungsten-doped CuBi2O4, and modifies palladium nanoparticles (Pd:CuO / W-CBO) for efficient and stable photoelectrochemical hydrogen peroxide generation. A non-biased photoelectrochemical system is constructed, which uses a Pd:CuO / W-CBO photo-cathode and a Pt / TiO2 anode to realize the synchronization of solar-driven hydrogen peroxide production and electrochemical glycerol oxidation to generate high-value chemicals. The hydrogen peroxide generated at the cathode can realize rapid water disinfection, and the work shows an expandable photoelectrochemical platform capable of stably generating solar-driven hydrogen peroxide and glycerol value-added at the same time, while generating renewable electricity.

The present application belongs to the technical field of pollutant treatment, and particularly relates to a method for electrocatalytic treatment of pollutants BDE-47. The present application first disperses BDE-47 in an emulsion system, expands the oil-water interface area, and improves the mass transfer efficiency. Further, the oil-water interfacial tension is reduced by polydopamine modified multi-walled carbon nanotubes, and the oil-water interfacial electrocatalytic active hydrogen is generated by loading palladium nanoparticles. In the present application, the polydopamine modified multi-walled carbon nanotubes loaded with palladium nanoparticles are emulsion-catalysis integrated catalysts, which can realize the synergistic regulation of catalytic activity and interfacial affinity, and improve the electrocatalytic degradation conversion efficiency of BDE-47.

The invention provides a method for repairing negative electrode graphite for a waste lithium ion battery. The method comprises the following steps: putting the negative electrode graphite for the waste lithium ion battery into a chemical vapor deposition furnace, introducing an organic carbon source gas, and carrying out chemical vapor deposition to prepare repaired graphite 1; the repaired graphite 1, water and a palladium precursor are mixed for adsorption, after adsorption is finished, a reducing agent is added into a reaction system for a reduction reaction, and a nano-palladium / repaired graphite 1 composite material is prepared; putting the nano-palladium / repaired graphite 1 composite material into a high-temperature furnace, introducing acetylene, and carrying out polymerization reaction to prepare repaired graphite 2; the repaired graphite 2 is subjected to graphitization treatment, and repaired graphite 3 is prepared; mixing the repaired graphite 3 with asphalt, and carrying out carbonization treatment; according to the method, the interior and the surface of the negative electrode graphite for the waste lithium ion battery can be synchronously repaired, and the negative electrode graphite material with good cycle performance can be obtained.