133results about How to "Improve catalytic oxidation efficiency" patented technology

The invention relates to the field of industrial wastewater treatment processes and provides a method for deeply treating, desalting and recycling industrial wastewater with high salt content. The method comprises the following steps: 1) carrying out efficient coagulation treatment on the industrial wastewater with high salt content to obtain supernatant; 2) carrying out chemical precipitation on the supernatant obtained in the step 1) to remove high valence ions with valence higher than bivalence in the wastewater; 3) carrying out catalytic ozonation treatment on the supernatant subjected to chemical precipitation in the step 2); 4) carrying out multi-media filtration, precise filtration and membrane filtration treatment on the wastewater subjected to catalytic ozonation in the step 3) in sequence; and 5) carrying out electrodialysis reversal treatment on the effluent obtained after membrane filtration in the step 4). By adopting the method, organic matters, bacteria, colloids, suspended particles, Ca<2+>, Mg<2+> and high valence ions, other soluble inorganic salts and the like in the industrial wastewater with high salt content are removed by utilizing the coupling and synergistic effects of different unit technologies, thus achieving deep treatment, desalting and recycling of the industrial wastewater with high salt content.

The present invention provides the biosynthesis of Schwertmannite as high efficiency adsorbent and its usage in adsorbing to eliminate Cr(VI) and As from waste water and underground water. Schwertmannite is prepared with ferrous sulfate as reactant, deionized water as reaction medium and Thiobacillus ferrooxidans LX5 as catalytic oxidant, and through stirring for 1-3 days, filtering to collect precipitate, washing with sulfuric acid acidified deionized water, washing with deionized water and stoving. Schwertmannite is added into water to be treated in the amount of 0.5 wt% or 0.02 wt%, dilute nitric acid is added into Cr(VI) containing system to regulate the pH value to 5.0-7.0 or sodium hydroxide is added into As containing system to regulate the pH value to 6.0-10.0, and the system is stirred for 3 hr and filtered to eliminate Cr(VI) and As. Schwertmannite has maximum adsorption amount on Cr(VI) and As of 55 mg / g and 65 mg / g separately.

The invention relates to a catalyst used for inducing catalysis and oxidation and a preparation method. The invention uses one or a plurality of salt solution of transition metals with certain concentration to immerse the Al2O3 which is activated, activated clay or diatomite, puts the Al2O3 which is activated, activated clay or diatomite into a muffle furnace to be roasted after being dried to dissolve the transition metal salt and reduce the oxide on the surface of the vector into metal substance after being reduced and activated to prepare the catalyst. The mass ratio between the vector of the catalyst prepared by the invention and the loading transition metal is (70-99):(1-30). The catalyst is mainly used for the catalysis and oxidation under the existence of an external energy field and has the advantages of the large adsorption capacity, the better effect of catalysis and oxidation, the fast reaction, the stable treatment effect, the wide scope of application, the long service life and so on. The invention can quickly dissolve the micromolecular substances into small molecule substances, facilitate the quick degradation of featured pollutants and reduce the biological toxicity of organic wastewater, so as to improve the biodegradability of the wastewater.

The invention relates to a modified attapulgite supported catalyst for oxidation of elemental mercury and a preparation method thereof, and belongs to the field of atmospheric pollution treatment technologies and environmental protection catalytic materials. The preparation method comprises the following steps of: preparing a modified attapulgite of a transition metal selected from Fe, Zn, Cu, Mn and Ce through an ion exchange method and using the attapulgite as a catalyst carrier; adding a certain amount of an active oxide component of one or more metal elements selected from Fe, Zn, Cu, Mn, Ce, W, Co, Ag, Au, Pd and V by the adoption of a sol-gel method; drying, calcining, and sieving to prepare the catalyst. Based on the total mass of the catalyst as the reference, the content of the loaded active metal oxide is 10-30 wt%. The catalyst has characteristics of high activity and low-temperature adaptability, and has a wide application prospect in the field of mercury cleaning in flue gas.

The invention relates to a treatment method for reverse osmosis concentrated water, in particular to a standard treatment method for the reverse osmosis concentrated water which is produced during sewage reusing. The treatment method comprises the following steps: the pH value of the reverse osmosis concentrated water is regulated to be 2.0-4.0, and electrolytic catalysis oxidation is carried out; water produced from the electrolytic catalysis oxidation is subjected to redox reaction in an electrolytic reactor, which is filled with iron-carbon fillers obtained through sintering of iron and carbon; hydrogen peroxide is then added, so that oxygenolysis is further achieved; the pH value is regulated to be 6.0-8.0, and a flocculant is added for flocculent settling; a supernate obtained from the flocculent settling enters an aeration biological tank, and a co-substrate is added for biological degradation. The COD of the reverse osmosis concentrated water with lower biodegradability, which is obtained through reverse osmosis reusing treatment after standard biochemical treatment, is reduced from 70-200 milligrams per liter to below 50 milligrams per liter, so that the strictest local emission standards can be met.

The invention discloses an efficient treatment system and a treatment method for organic wastewater of bulk drug production in the pharmaceutical industry. The system comprises a high-concentration wastewater pretreatment unit, a triple effect evaporation unit, a biochemical treatment unit, a sludge pressure filtration unit and an activated carbon filtration deep treatment unit. By introduction ofa series of treatment means such as iron carbon reduction, catalytic oxidation, coagulation air floatation, triple effect evaporation, biochemical reaction and the like into the unit system, physicochemical treatment and biochemical treatment are combined together, removal efficiency of pollutants is increased, and the pollutants such as COD (chemical oxygen demand), ammonia nitrogen, SS (suspended solids) and the like in the wastewater are effectively degraded.

The invention discloses a technology and device for treating coking wastewater through an ozone catalytic oxidation combined biofilter. The technology and device are reasonable in design, low in operation cost, solve the problem related to advanced treatment and recycling of coking wastewater, and have a high engineering application value; the technology and device eliminate the unsafe factors for operators and potential risks threatening the health in a heavily polluted environment with coking wastewater, and are simple to operate and low in operation cost; the effluent water quality meets different water use requirements.

The invention belongs to the field of inorganic catalytic materials and relates to a silicon carbide modified catalyst used for catalytically oxidizing methylbenzene under microwave-heating conditionand a preparation method of the catalyst. The preparation method includes the steps of doping a supporter with SiC and supporting an active component additive CeO2 on the modified supporter through coprecipitation. The catalyst can change the binding mode between the SiC and the catalyst, so that the catalyst is quicker and more uniform to heat, thereby significantly reducing catalytic oxidizing temperature and improving efficiency. The method reduces usage amount of the SiC and saves cost. The catalyst is sintering resistant and is easy to regenerate. The raw materials are easy to obtain andthe preparation method is simple. The technical process is easy to carry out, so that the catalyst has advantages on engineering application.

The invention provides a cerium-zirconium base nitric oxide common temperature catalyst preparation method, which is characterized by comprising: adopting active alumina powder as a carrier, carrying out cerium nitrate and zirconium nitrate impregnating loading, calcining, carrying out copper acetate and ammonia water mixed solution impregnating, and carrying out low temperature drying to obtain the catalyst so as to achieve common temperature catalysis oxidation on nitric oxide. Compared with the preparation method in the prior art, the preparation method of the present invention has characteristics of simple process, high catalysis efficiency and the like, wherein NO oxidation absorption efficiency is significantly increased.

The invention discloses a molecular sieve supported Cu-Cp Schiff base complex, and a preparation method and application thereof. A method of 'building a ship in a bottle' is employed for packaging a complex in molecular sieve, thus the complex is prevented from forming dimer, multimer or peroxides, and the catalytic oxidation activity of the complex is kept. The complex has high catalytic oxidation efficiency on sulfides in gasoline and is easy to recover and reuse, and gasoline subjected to sulfide degradation is high in recovery rate and high in reutilization rate. The preparation method is simple in operation and has industrial practicality.

The invention relates to a method for deeply treating aromatic nitro-compound wastewater through photo-assisted catalysis and belongs to the technical field of catalytic oxidation wastewater treatment. The method comprises the following steps: (1) adjusting a potential of hydrogen (pH) value of the wastewater to be in a range of 1.5-5.5, (2) adding a compound containing ferrous iron ions or ferric iron ions, wherein the adding amount of the iron ions is 5-75 mg / L, (3) adding an oxidizing agent to perform catalytic oxidation reaction at the temperature of 5-65 DEG C for 10-30 minutes, (4) using ultraviolet light with dominant wavelength of 252.7nm to perform irradiation for 5-30 minutes, and (5) continuing to perform the catalytic oxidation reaction at the temperature of 5-65 DEG C, wherein the adding mount of the oxidizing agent is 0-50% of total oxidizing agent amount. By applying a small amount of iron-ionic catalyst and with the assist of ultraviolet light irradiation, oxidation treatment of the low-concentration aromatic nitro-compound wastewater is efficiently performed, the time required by reaction for reducing chemical oxygen demand (COD) and removing a toxicant aromatic nitro-compound is shortened, and biochemical treatment is easily performed.

The invention discloses a catalytic ozonation catalyst and a preparation method thereof. The preparation method includes following steps: (1), using activated carbon to wash for removing impurities; (2), modifying an activated carbon carrier; (3), soaking an active component to prepare a catalyst precursor; (4), calcining the catalyst precursor to obtain the catalytic ozonation catalyst. The catalytic ozonation catalyst prepared by the preparation method can be used for treating domestic sewage or industrial wastewater containing degradation-resistant organic matter, removal rate of high-degradation-difficulty organic matter in wastewater can reach higher than 95%, and the catalytic ozonation catalyst has the advantages of being efficient, environment-friendly, wide in application range and long in service life.

The invention relates to metal doped modified layered [delta]-MnO2, preparation and applications thereof. According to the present invention, the metal doped modified layered [delta]-MnO2 is preparedby adding a settling agent through a hydrothermal method, wherein the specific surface area is increased by 5 times compared with the undoped layered [delta]-MnO2, and the pore channels are dense, such that the metal doped layered [delta]-MnO2 has high catalytic oxidation activity and high chlorine resistance, and has efficient catalytic degradation performance on refractory volatile organic compounds in organic waste gas; and the preparation method is simple, and has industrial application value.

The invention discloses a catalyst for reforming methane and carbon dioxide to prepare synthesis gas. The catalyst is prepared from the components in percentage by mass: 2-3% of metal iridium and 97-98% of a cerium oxide-based solid solution, wherein the cerium oxide-based solid solution is pure cerium oxide, a cerium oxide-lanthanum oxide solid solution, a cerium oxide-praseodymium oxide solid solution, a cerium oxide-zirconium oxide solid solution or a cerium oxide-titanium oxide solid solution. According to the invention, the catalyst for reforming methane and carbon dioxide to prepare synthesis gas is prepared through a simple deposition-precipitation, coprecipitation or sequential precipitation method, and the catalyst shows the characteristic of high catalytic efficiency in reforming reaction of dried methane gas at 750-800 DEG C, and has relatively good stability.

The invention relates to a magnetic light-enzyme composite catalyst and a preparation method thereof. The magnetic light-enzyme composite catalyst is laccase immobilized on magnetic nano TiO2 processed by surface functionalization, particularly laccase immobilized on magnetic nano TiO2 particles modified by copper ion chelating. According to the invention, the magnetic light-enzyme composite catalyst provided by the invention realizes the transmission of electrons between laccase and TiO2 in the catalytic oxidation process, solves the problems of slow speed of receiving electrons by laccase from the substrate and slow combination between photoinduced electrons and O2; by using the synergism of enzyme catalysis and photocatalysis to raise catalytic oxidation efficiency, the oxidation of substrates with high oxidation-reduction potential and macromolecule substrates can be realized; the catalyst has superparamagnetism, can be conveniently and effectively controlled and separated under the effect of external magnetic field, the preparation process is simple, and the catalyst is suitable for large scale production.

The invention provides a catalyst and a preparation method thereof, wherein the catalyst comprises the following compositions in percentage by mass: 20 to 60% of Fe2O3, 20 to 60% of MnO2, 9.7 to 30% of Mn2O3, and 6 to 30% of Mn3O4; and the method for preparing the catalyst comprises the following steps of: adding a polyethylene glycol aqueous solution into a bivalent manganese salt aqueous solution at a certain temperature, then adding potassium permanganates and a ferric salt aqueous solution into the obtained mixed solution; stirring the obtained mixture so as to obtain a precipitate; filtering the obtained object so as to obtain a solid as the precursor of the catalyst; drying and then roasting the solid; and crushing the obtained solid subjected to roasting into particles so as to obtain the catalyst. The catalyst and the preparation method provided by the invention have the advantages that by using the prepared catalyst, at a reaction temperature of 100 DEG C, the rate of conversion between NO in tail gas and NO2 can achieve 91%; the prepared catalyst is larger in specific surface area and pore volume, and high in catalytic oxidation efficiency; and the prepared catalyst has a low-temperature catalytic activity, and can be used in the removal of NO in low-temperature oxygen-containing exhaust emission sources without performing the removal at a high temperature and addingoxidants, thereby saving energy and reducing consumption and cost.

The invention provides a catalyst for catalytically oxidizing low-concentration methane. The catalyst is composed of octahedral CeO2 particles and Pd nano particles supported on the surfaces of the octahedral CeO2 particles. The catalyst for catalytically oxidizing the low-concentration methane provided by the invention is a Pd-based octahedral CeO2 catalyst, the Pd nano particles have a high dispersion degree and good relative stability on the surfaces of the carrier octahedral CeO2 particles, the catalyst has high catalytic oxidation efficiency of the low-concentration methane and good relative thermal stability, temperature required for complete conversion of the low-concentration methane is low, catalytic reaction products are H2O and CO2 which are environmentally-friendly products, and the catalyst has great application value in the field of catalytic oxidation of the low-concentration methane.

The invention discloses a recovery method of a fiber reinforced composite material. The fiber reinforced composite material is catalytically oxidized through an organic catalyst to depolymerize thermosetting epoxy resin into thermoplastic linear macromolecules and rapidly dissolve the thermoplastic linear macromolecules in an organic solvent, so that the fiber material and the thermoplastic polymer are separated and recovered. The method disclosed by the invention has the advantages of mild degradation conditions, simple process operation, small amount of three wastes, environmental friendliness and the like, and is a green method for recycling the fiber reinforced composite material.

The invention relates to a catalyst for carbon monoxide normal-temperature catalytic and oxidation as well as a preparation method and application. Palladium chloride and copper chloride are taken as active components of the catalyst, and activated aluminum oxide modified from phosphate acts as a carrier, wherein phosphate is one or two of lanthanum phosphate and cerous phosphate. The activated aluminum oxide carrier modified from phosphate is prepared by a deposition method. Palladium chloride and copper chloride are loaded on the carrier by a dipping method, and the required catalyst is obtained after high-temperature roasting. The catalyst can be used for catalyzing and oxidizing carbon monoxide under the conditions of normal temperature, low concentration and high airspeed, can eliminate carbon monoxide in air effectively, and has high stability.

The invention discloses an SCR catalyst for efficiently oxidizing elemental mercury and a preparation method of the SCR catalyst. The catalyst is composed of three parts including an active component, an adjuvant and a carrier, wherein the active component is a mixture of CuCl2 and V2O5; the adjuvant is WO3; the carrier is TiO2; the mass of the catalyst is measured on the basis of the mass of the carrier; the masses of the active component and the adjuvant respectively account for 1-10% and 1-8% of the mass of the carrier; and the mass ratio of CuCl2 to V2O5 in the active component is (1-10):10. The SCR catalyst has the beneficial effects that the dependency on the content of Cl in smoke is relatively low, so that the relatively high denitration efficiency is ensured, and meanwhile the elemental mercury can be efficiently oxidized; the two active components CuCl2 and V2O5 are effectively proportioned, so that the catalytic oxidation efficiency of the catalyst to the elemental mercury is greatly increased; and the preparation method of the SCR catalyst disclosed by the invention is an impregnation method which is simple in step, easily-controlled in reaction process and good in stability.

The invention belongs to the technical field of wastewater treatment in chemical engineering and environmental engineering, and relates to a catalytic oxidation catalyst, a preparation method thereof,and an advanced treatment method of organic matters in MDI brine. The catalyst comprises a carrier and an active component, the carrier is titanium dioxide, and the active component is an organic neutral ligand-metal complex ionic liquid. The advanced treatment method comprises the following steps: (1) adjusting the pH value of the MDI brine, and adding an oxidant to carry out treatment; and (2)contacting the treated MDI obtained in step (1) with a catalytic oxidation catalyst to carry out a catalytic oxidation reaction so as to obtain advanced treated brine. The catalyst can reduce or evenavoid the loss of metal in the catalyst while ensuring the improvement of the catalytic oxidation effect; and the advanced treatment method has the advantages of simplicity, easiness in implementation, high treatment efficiency, and no secondary pollution.

The invention discloses a technology and a device for composite type advanced catalytic oxidation and belongs to the field of advanced wastewater treatment. According to the technology and the device for composite type advanced catalytic oxidation, a Fenton technology, a photo-catalytic oxidation technology and a metal catalytic oxidation technology are combined, the rate for producing hydroxyl radicals with strong oxidation capacity is increased under the catalytic conditions of metal and light, by means of chemical reactions such as hydroxyl addition, substitution, electron transfer and the like of the formed hydroxyl radicals with pollutants, most organic compounds can be mineralized or decomposed, one part is mineralized and precipitated, the other part of macromolecular compounds are decomposed into low-toxicity or toxicity-free micromolecular substances, certain compounds are even directly decomposed into water and carbon dioxide, and the wastewater treatment effect is realized. On the basis of catalytic oxidation, catalysts and agent feeding addition are optimized, different types of catalysts are used in different contact time, the agent consumption is reduced substantially, the comprehensive energy consumption is reduced effectively, and organic compounds difficult to decompose in wastewater are removed in a targeted manner. With use of multiple catalysts, the efficiency is doubled or more that of a common ozone catalyst or other strong oxidants, and accordingly, the operation cost is reduced greatly.

The invention discloses a metal-doped hollow silicon dioxide microsphere and a preparation method and application thereof, belonging to the technical field of material preparation. The preparation method comprises the following steps: firstly, preparing undoped silicon dioxide microspheres by adopting a reversed-phase microemulsion method; then, adding the undoped silicon dioxide microspheres intoa mixed solution of an inorganic salt containing Mn, Cu and Ce, and conducting hydrothermal treatment so as to obtain a metal doped silicon dioxide microsphere; and finally, carrying out water bath treatment on the metal-doped silicon dioxide microsphere to obtain the metal-doped hollow silicon dioxide microsphere. According to the invention, the metal-doped hollow silicon dioxide microsphere with a firm skeleton and uniform granularity are obtained by adjusting the adding sequence of raw materials and controlling the synthesis conditions.

The invention belongs to a method and a device for oxidatively decomposing pollutants in exhaust gases emitted by an internal combustion engine with the intervention of ultraviolet light. At least one ultraviolet light irradiated region through which the exhaust gases emitted by the internal combustion engine pass is arranged in an exhaust system of the internal combustion engine, at least one photocatalyst net through which the exhaust gases emitted by the internal combustion engine pass is arranged at at least one end of the ultraviolet light irradiated region, and the ultraviolet light intervenes in the oxidative decomposition of the pollutants in the exhaust gases emitted by the internal combustion engine. Particulate matters emitted by the internal combustion engine can be decomposed and purified, and the catalytic oxidation-reduction reaction of a three-way catalytic converter is added, so that the problems of emissions of the particulate matters of the internal combustion engine are solved, noxious substances in the tail gases are purified, and environmental pollution is reduced; and the method is simple and practical, the emissions of harmful gases in the tail gases can be effectively reduced, and the environmental pollution can be reduced.

The invention provides an integral composite catalytic oxidation-membrane separation wastewater treatment method which comprises the following steps: S1, introducing wastewater with a suspension catalyst, a mixed gas of ozone and oxygen and hydrogen peroxide into a gas-liquid mixer; S2, introducing the wastewater into a composite catalytic oxidation reactor, and inputting into an energy field through an energy field generation device; S3, filtering the wastewater by using a ceramic membrane filter, performing up-to-standard emission on effluent, emptying the treated gas, and feeding back membrane concentrated water which does not pass through the ceramic membrane filter and contains the suspension catalyst to the step S1. Devices used in the method provided by the invention comprise one gas-liquid mixer which can generate micro-nano bubbles, so that the apparent solubility of ozone and oxygen in the wastewater can be effectively improved, and the catalytic oxidation efficiency can be improved. Due to adoption of the energy field generation device, microwaves, ultrasonic waves, the catalyst and an oxidant have synergic effects in a composite catalytic oxidation reactor, so that the degradation velocity of pollutants by the oxidant can be increased.

The invention relates to a photocatalyst for efficiently degrading organic pollutants and a preparation method thereof. According to the photocatalyst, a silicon-aluminum composite oxide is used as acarrier, and ferric oxide and titanium dioxide are used as effective components; wherein the effective components are immobilized on the carrier. The TiO2 and Fe2O3 in the catalyst are uniformly distributed, and the immobilized TiO2 is not easy to hydrate and disperse; Fe<3+> in the system can be reduced into Fe<2+> in time, so that the generation of iron sludge is reduced, and the utilization rate of iron ions is increased. The catalyst particles are not easy to crack in water, so that a Fenton-photocatalysis synergistic system has practical application value. Compared with a traditional Fenton and photocatalysis advanced oxidation system, the catalyst has the advantage that the catalytic oxidation efficiency is greatly improved.

The invention discloses an electrodegradation recovery method of a carbon fiber reinforced composite material. According to the invention, electrocatalytic oxidation is adopted to oxidize thermosetting resin into a low-molecular-weight thermoplastic polymer and quickly dissolve the low-molecular-weight thermoplastic polymer in a mixed solvent, thereby separating and recovering carbon fibers and implementing resource reutilization. The conductivity of the mixed solvent and the solubility of the high-molecular polymer are good, so the catalytic oxidation efficiency of the fiber reinforced material can be obviously improved, a fiber recovery rate can reach 95% or above, and the thermosetting cross-linked epoxy resin is electrocatalytically oxidized and degraded into the low-molecular-weight thermoplastic polymer which is then dissolved in the mixed solvent, so separation and recycling are realized; and after electrocatalytic oxidation, water and the organic solvent can be directly distilled and recovered from electrodegradation liquid, and the electrodegradation liquid recovered through reduced-pressure distillation and washing liquid are mixed to serve as the electrodegradation liquid to be reused. The electrodegradation recovery method has the advantages of mild degradation conditions, simple process operation, no corrosion, a small amount of three wastes, environmental optimization and the like.

The invention discloses a method for desulfurizing sodium sulfide wastewater, belonging to the fields of electronic electroplating wastewater treatment and comprehensive reutilization. The method comprises the following steps: (A) regulating the pH value of sodium-sulfide-containing waste liquor to 6.0-9.0; (B) introducing the sodium-sulfide-containing waste liquor subjected to pH value regulation in the step (A) into an aeration reaction tank, starting an aerator while adding 0.1-10 wt% of catalyst, and reacting for 0.5-2 hours; (C) naturally flowing the mixed solution obtained in the step (B) into a precipitation tank, and standing to precipitate for 1-2 hours; and (D) sending the supernate in the step (C) into the next sewage treatment unit as effluent water, taking out the residual precipitate in the precipitation tank, packing, and transporting. The catalyst is a metal and oxide thereof or a mixture of multiple metals and oxides thereof. The method has the advantages of high oxidization efficiency, thorough desulfurization, simple technique and the like, and can effectively remove sodium sulfide in wastewater.

The invention discloses a process for deep treatment on organic wastewater by using multielement microelectrolysis packing. The process comprises the following steps: (1) feeding organic wastewater into an adjusting tank through secondary sedimentation tank effluent, and adjusting the pH value to acidity; (2) after the pH value is adjusted to acidity, feeding organic wastewater into a microelectrolysis reactor, performing oxydative degradation on organic matters in the organic wastewater by using a sand granule shaped multielement alloy framework packing, and filtering off suspended solids; (3) feeding wastewater effluent after treatment into a flocculation basin, adding a strong alkali solution into the flocculation basin, and carrying out a synergistic flocculation function; and (4) feeding wastewater treated in the flocculation basin into an inclined tube sedimentation tank, removing precipitate, and discharging the water, thereby completing deep treatment on organic wastewater. As the sand granule shaped multielement microelectrolysis packing of an alloy framework is adopted as microelectrolysis packing, deep treatment on degradation-resistant organic wastewater is achieved through microelectrolysis reaction with filtration of flowing sand, organic wastewater can be effectively and deeply treated, the effluent can be excellent in quality, and in addition, the process is simple, low in cost and free of pollution of environments.