21 results about "Sulphide oxidation" patented technology

The invention discloses a sulfide-oxide composite solid electrolyte based on Lewis acid-base reaction, a preparation method of the sulfide-oxide composite solid electrolyte and a battery, and relates to the technical field of solid-state batteries. Comprising a sulfide electrolyte and a composite coating coated on the surface of the sulfide electrolyte, and the composite coating comprises an oxide electrolyte and a Lewis alkaline substance. The oxide electrolyte and the Lewis alkaline substance are adopted as the composite coating material, so that the sulfide electrolyte can be isolated from air, the air stability of the sulfide electrolyte is effectively improved, and the phenomenon that the sulfide electrolyte is subjected to oxidation-reduction decomposition in the charge-discharge process is reduced; and by-products generated in the use process of the sulfide electrolyte can be neutralized in situ by the Lewis alkaline substance, so that the great increase of interface impedance is reduced, the cycle performance and high-current stability of the battery are remarkably improved, and the problem that the interface impedance is increased in the charge-discharge process of the traditional sulfide solid electrolyte is solved.

The invention discloses a multifunctional catalyst for a diesel vehicle and a preparation method, and relates to the field of catalyst preparation, the multifunctional catalyst for the diesel vehicle comprises a precious metal coating and an SCR coating which are arranged in a layered mode, and the SCR coating is located above the precious metal coating; the SCR coating is of a sectional structure and comprises an SCR coating front section and an SCR coating rear section. The problems that an existing catalyst is low in NOx efficiency during cold start, coating regeneration after HC / SO2 poisoning cannot be achieved at the same time, low N2O selectivity cannot be ensured, and unreacted NH3 cannot be treated at the same time are solved, by means of the layered and sectional type coating structure design, diesel oil or other hydrocarbon fuel sprayed backwards by a system can be rapidly oxidized through the bottom layer precious metal coating, reaction heat is generated, and the catalyst can be recycled. The temperature of the whole catalyst is increased, adsorbed HC and sulfide are oxidized and removed, and the SCR activity is recovered. And unreacted NH3 can be treated, so that the arrangement space of a post-treatment catalyst is saved. The upper-layer sectional type coating structure not only can efficiently convert NOx at a low temperature, but also can keep relatively low N2O selectivity.

The invention relates to the technical field of wastewater treatment, in particular to a bifunctional catalyst as well as a preparation method and application thereof. The catalyst comprises noble metal nanoparticles and a porous carbon layer coating the surfaces of the noble metal nanoparticles, the noble metal is selected from one or more of Pd, Rh and Ru; the specific surface area of the porous carbon layer is 150-1000m < 2 > / g, and the pore size distribution is 0.1-5nm; and transition metal elements are doped in the porous carbon layer. By means of the unique structure that the precious metal nanoparticles are coated with the porous carbon layer, dual purposes of one material are achieved, and excellent cathode electro-catalysis nitrate reduction (ENRR) activity and anode sulfide oxidation (SOR) stability are achieved at the same time. According to the catalyst, an ENRR and SOR coupled electro-catalysis system can be constructed at the same time, nitrate in wastewater is efficiently reduced into ammonia with high added value in a single system, sulfide is oxidized into elemental sulfur, and therefore removal of pollutants and recovery of valuable resources are completed synchronously.

The invention relates to the technical field of electrocatalysis, in particular to an oxygen / sulfur heterostructure oxygen evolution electrocatalyst and a preparation method and application thereof. Based on an in-situ oxidation strategy, a CuFeO layer is generated on the surface of CuFeS, and the CuFeS-coated CuFeO high-performance oxygen evolution electrocatalyst with a heterostructure is obtained. By constructing a sulfide-oxide heterojunction, a built-in electric field can be formed at an interface to promote charge separation and transfer, so that the electrocatalytic activity is remarkably improved. And on the other hand, the CuFeO layer on the outer layer serves as an armor, and the problem of oxidation of the surface of CuFeS is solved. The electro-catalytic performance and the long-term stability are obviously improved.

The application belongs to the technical field of solid electrolyte, and particularly relates to a method for preparing melon pulp structure sulfide / oxide solid electrolyte by a mechanical method, which comprises the following steps: under the condition of a protective atmosphere, pre-mixing sulfide solid electrolyte powder and oxide solid electrolyte powder, then speed-changing ball milling the obtained pre-mixed material to obtain a mixed powder; the speed-changing ball milling is sequentially low-speed ball milling and high-speed ball milling under the condition of low-temperature nitrogen; heat pressing the mixed powder under the condition of a protective atmosphere to obtain a sulfide / oxide composite solid electrolyte; the rotating speed of the low-speed ball milling is 100-150 rpm; the rotating speed of the high-speed ball milling is 350-390 rpm; during the high-speed ball milling, the low-temperature nitrogen is continuously introduced into a ball milling chamber so that the temperature in the ball milling chamber is 0-10 DEG C. The application realizes high interface bonding strength and high lithium ion conductivity by the combination of speed-changing ball milling, low temperature and heat pressing processes.

A process for treating minerals containing metal sulphide and a precious metal, the process comprising fine grinding the minerals and subjecting the minerals to a first leaching step conducted under oxidising conditions at a pH of from 5 to 7, and subjecting a pulp or suspension or solid residue from the first leaching step to a second leaching step conducted under oxidising conditions at a pH of at least 9.0.

The invention belongs to the technical field of environmental treatment, and particularly relates to a wastewater treatment system and a method for treating kitchen waste water. The sludge subjected to anaerobic fermentation modification in the sludge modification tank is used for adsorbing grease in the kitchen waste water, so that the grease removal rate is increased; effluent of the anoxic tank flows back to the anaerobic tank, sulfide generated by protein decomposition in the anaerobic tank is oxidized into sulfate, and the emission of malodorous gas is reduced; partial nitrate is reduced into nitrite through short-cut denitrification of the anoxic tank, and a substrate is continuously provided for anaerobic ammonia oxidation; and the total nitrogen removal rate is improved on the premise of not additionally adding a carbon source. The anaerobic tank is inoculated with hydrolytic acidification bacteria, refractory organic matters are hydrolyzed into biodegradable organic matters, denitrifying bacteria utilize the biodegradable organic matters to convert nitrite / nitrate into nitrogen, and phosphorus-accumulating bacteria synchronously complete anaerobic phosphorus release; and the aerobic tank uses nitrite / nitrate of the effluent of the anoxic tank as an oxidizing agent to promote phosphorus-accumulating bacteria to absorb phosphorus so as to realize phosphorus removal.

This invention relates to the field of sodium-ion battery anode material technology, and discloses a cobalt vanadium sulfide / graphene three-dimensional composite aerogel and its preparation method, comprising: mixing cobalt salt, vanadium salt, urea, thioacetamide and water and reacting at high temperature to obtain cobalt vanadium sulfide; mixing cobalt vanadium sulfide, graphene oxide (GO) dispersion, multi-walled carbon nanotubes and polyvinyl alcohol solution for pre-crosslinking; then adding ascorbic acid and high-temperature hydrothermal molding to obtain composite hydrogel; solvent displacement and freeze-drying of composite hydrogel to obtain composite aerogel; and finally calcining under an inert atmosphere to obtain the product. The three-dimensional aerogel framework of this invention can uniformly and confinedly disperse cobalt vanadium sulfide, inhibiting the agglomeration of nanoparticles; the interconnected three-dimensional pore structure can provide rapid diffusion channels for electrolytes / reactants, shortening the ion and molecule transport distance, significantly improving the material mass transfer efficiency, and exhibiting superior reaction kinetics in energy storage, catalysis, adsorption and other applications.

The present application relates to wastewater treatment technical field, particularly to a kind of bifunctional catalyst and its preparation method and application.The catalyst includes noble metal nanoparticles and porous carbon layer coated on the surface of noble metal nanoparticles;Noble metal is selected from one or more of Pd, Rh, Ru;The specific surface area of porous carbon layer is 150-1000m 2 / g, pore size distribution is 0.1-5nm;Transition metal element is doped in porous carbon layer.Through the unique structure of porous carbon layer coated noble metal nanoparticles, it realizes "one material two uses", and has excellent cathode electrocatalytic nitrate reduction (ENRR) activity and anode sulfide oxidation (SOR) stability.The catalyst can simultaneously build ENRR and SOR coupled electrocatalytic system, efficiently reduce nitrate in wastewater to high value-added ammonia in single system, and oxidize sulfide to elemental sulfur, so as to simultaneously complete the removal of pollutants and the recovery of valuable resources.

The application discloses a method for preparing DFF by oxidizing HMF based on a load Anderson type polyoxometalate sulfide, and specifically comprises the following steps: 1, preparing an Anderson type polyoxometalate loaded multi-metal sulfide; 2, adding HMF solution, and performing a photocatalytic oxidation experiment under light conditions. The method solves the problem of low catalytic efficiency in catalytic oxidation of HMF caused by high electron hole rate and short service life of ZnIn2S4 material by using a heteropoly acid loaded ZnIn2S4-SnIn4S8 material. The process can not only efficiently synthesize DFF (selectivity reaches 98%) but also has mild reaction conditions and simple operation, and is a cheap and efficient DFF preparation method, which provides a reference for renewable biomass resource conversion and has important significance for development of new renewable energy.

The application relates to the technical field of battery materials, and particularly discloses a titanium nitride nanotube array material, a preparation method and application thereof; the titanium nitride nanotube array material is obtained through the following steps: firstly, constructing a uniform concave base through one-time oxidation demolding; secondly, growing a highly regular TiO2 nanotube array through two-time oxidation; and finally, in-situ nitriding to obtain the titanium nitride nanotube array material. The structure directly grows the high-conductivity titanium nitride skeleton on the surface of a titanium current collector in-situ, completely discards the binder and conductive agent system of a traditional powder electrode, and eliminates the interface contact resistance and the binder polarization resistance. The regular and open three-dimensional tubular pore structure can realize uniform loading of sulfur active substances, effectively buffers the volume expansion during charging and discharging, the high conductivity of TiN and the rich active sites can accelerate the polysulfide redox kinetics, and finally, the lithium-sulfur battery has high discharge specific capacity, excellent rate performance and long cycle stability.

The application belongs to the field of environmental microorganism culture and sludge resource utilization, and relates to a Desulfobulbaceae The application discloses a cable bacteria strain and application thereof, and a 16S rRNA gene sequence of the cable bacteria strain is shown as SEQ ID NO:1. The strain can couple a sulfide oxidation process and an oxygen reduction process in sludge, can adapt to a complex oxidation-reduction environment in the sludge system, can form a stable vertical oxidation-reduction gradient in the sludge system, and can couple a deep sulfide oxidation process and a surface oxygen reduction process through long-distance electron transfer. The strain can promote migration and oxidation conversion of sulfide in the sludge from a deep layer to a surface layer, and can reduce local sulfide accumulation. Meanwhile, the strain can affect spatial distribution of Fe(II) / Fe(III) in the sludge system, and can promote iron oxidation-reduction circulation and a sulfur-iron coupling process.

The invention relates to a sulfur-containing wastewater treatment method for efficiently removing sulfides. The method comprises the following steps: (1) treating sulfide-containing wastewater until the pH is alkaline; ozone is introduced into the alkaline sulfur-containing wastewater, and sulfide is oxidized into insoluble elemental sulfur; (2) adding one or two of coagulant polyaluminum chloride or polyferric sulfate, so that the elemental sulfur particles and other suspended impurities are coagulated to form large particle groups; (3) adding a cationic flocculant to flocculate elemental sulfur particles and other suspended impurities in the wastewater; and (4) carrying out solid-liquid separation on the flocculated wastewater through gravity settling, so as to realize desulfurization treatment on the wastewater containing inorganic sulfides such as S. HS and the like. According to the method, the sulfide removal rate is high and can reach 95% or above; the agent addition amount is small, the treatment cost is low, and economic benefits are good; the method is green, low-carbon and less in pesticide residue. The method is suitable for treating industrial wastewater containing S, HS, organic sulfide and the like in various industries such as coal chemical industry and petrochemical industry.

A process is disclosed for removing sulfides from liquid fossil fuel comprising mixing the liquid fossil fuel with an oxidizer and catalyst to form a multiphase reaction medium and producing a fluid flow of the multiphase reaction medium. Ultra sound may be applied to the multiphase reaction medium to cause oxidation of sulfides in the liquid fossil fuel to sulfones; and extracting the sulfones to yield an organic phase and aqueous phase. The ultra sound is performed by generating vibrations parallel to the fluid flow of the multiphase reaction medium. The organic phase substantially consists of desulfurized fuel.

The invention discloses a wastewater treatment system and method based on sulfur recovery and denitrification, and belongs to the technical field of wastewater biological treatment. The system comprises an anaerobic reactor, a low-oxygen reactor, a primary precipitator, an aerobic-anoxic reactor and a secondary precipitator which are communicated in sequence. The method comprises the following steps: wastewater enters an anaerobic reactor for sulfate reduction; anaerobic effluent enters a low-oxygen reactor to oxidize sulfide into elemental sulfur; sulfur-containing sludge separated by the primary precipitator enters an anoxic section of the aerobic-anoxic reactor after wall breaking, and nitrate nitrogen is reduced into nitrogen by utilizing elemental sulfur and an organic carbon source in the sludge as electron donors for sulfur autotrophic denitrification and heterotrophic denitrification respectively. Through the process of anaerobic sulfur production, low-oxygen sulfur fixation and oxygen-deficient sulfur utilization, oriented conversion and resource recovery of sulfur elements are achieved, the requirement for an external carbon source is lowered, and the method has the advantages of being high in denitrification efficiency, low in sludge yield and low in treatment cost.

The invention belongs to the technical field of electro-catalytic materials, and particularly relates to a transition metal-based heterojunction nano array electrode material and a preparation method and application thereof. The transition metal-based heterojunction nano array electrode material provided by the invention is prepared by three steps: firstly, placing a current collector in a mixed solution of transition metal salt and an organic ligand for reaction to obtain a metal-organic ligand precursor array material; then, the precursor array material is placed in a solution containing oxometallate to be treated; and finally, carrying out high-temperature gas-solid reaction with a selenium / tellurium source. The material can be used as an electro-catalytic material, shows excellent catalytic activity and stability in sulfide oxidation reaction (SOR), and provides an efficient and green solution for sulfur-containing wastewater treatment.

This utility model discloses a production and preparation device for low-arsenic yellow phosphorus, including a vessel body, a screening cylinder at the top of the vessel body, a feed inlet at the top of the screening cylinder, a liquid inlet on the top side wall of the vessel body, a stirring rod inserted at an angle into the inner cavity of the vessel body, inclined impeller blades on the side wall of the stirring rod, a drive motor connected to one end of the stirring rod extending out of the vessel body, a titanium alloy ultrasonic vibrating plate on the inner side wall of the vessel body, and a discharge port connected to the discharge port. This utility model utilizes the ultrasonic cavitation effect to break the surface coating of phosphate rock, releasing internal arsenic impurities. Oxidizing agents and other reagents are used to fully contact and react with the arsenic-containing phosphate rock, oxidizing elemental arsenic and sulfides into soluble substances, increasing the arsenic oxidation rate, and effectively reducing the arsenic content in the phosphate rock.

The present application provides a kind of mineral sulfide and / or sulfate content detection method and device, it is related to analytical detection technical field.The present application is determined using stage temperature combustion iodometric method, first in low temperature stage (500~700 DEG C) oxidation reaction is carried out, and the sulfide in the mineral to be detected is oxidized into sulfur dioxide;Again in high temperature stage (1150~1350 DEG C) reduction reaction is carried out, and the sulfate in the combustion residue is reduced into sulfur dioxide, and the sulfur dioxide generated in low temperature stage and high temperature stage is titrated respectively by iodometric method, and then the content of sulfide and / or sulfate in the mineral to be detected is calculated, the sulfide, sulfate and total sulfur content in the mineral to be detected can be obtained simultaneously in one detection process, and then the sulfur form distribution information in the mineral to be detected is obtained.Moreover, the method provided by the present application is simple in operation, short in time consumption, low in risk of sulfur form conversion, high in detection accuracy, and suitable for industrial detection application.

The invention relates to the technical field of gas treatment, and discloses a deep desulfurization system for preparing methanol from coke oven gas and a use method.The deep desulfurization system comprises a photoelectrocatalysis desulfurization module, a nano molecular sieve adsorption module and a regeneration module which are sequentially arranged in the movement direction of the coke oven gas; the photoelectrocatalytic desulfurization module is composed of a reaction tower, a photoanode, a photocathode and an electrolyte, the material of the photoanode is a TiO2-ZrO2 heterojunction nanotube array, the material of the photocathode is a NiFe-LDH / carbon felt composite electrode, and the electrolyte adopts an ionic liquid [BMIM] [BF4] coupled Fe < 3 + > / EDTA redox medium; through integration of a photoelectric coupling technology and a deep desulfurization system, efficient desulfurization, pollutant removal, prolonging of the service life of equipment, prolonging of the service life of a methanol synthesis catalyst and maximization of environmental protection benefits in the process of preparing methanol from coke oven gas are realized; sulfide oxidation / hydrogenation reaction kinetics is improved, and energy consumption is reduced.