13results about How to "Improve redox ability" patented technology

The invention discloses a rare earth tailing-based aerogel catalyst for refractory coal and a preparation method thereof, and the preparation method comprises the following steps: a, pretreating rare earth tailings rich in cerium oxide to obtain raw material powder; b, carrying out modification treatment on the raw material powder obtained in the step a to obtain modified powder; and c, preparing rare earth tailing-based aerogel from the modified powder obtained in the step b, and grinding to obtain the catalyst. The rare earth tailing-based aerogel catalyst prepared by the invention has a relatively high specific surface area and a rich pore structure, obviously improves the combustion efficiency of fire coal, can be suitable for fire-retardant solid fuel, realizes wide-load stable combustion of fire-retardant coal powder, expands the coal type adaptability of a unit, reduces the use amount of long flame coal, and reduces the production cost. The coking problem is effectively solved.

The invention discloses a desulfurization ash-based denitrification nitrogen removal filter material as well as a preparation method and application thereof. The desulfurization ash-based denitrification nitrogen removal filter material is prepared from the following raw materials in parts by weight: 150 to 255 parts of elemental sulfur, 1 to 55 parts of calcium carbonate and 1 to 55 parts of desulfurization ash. The desulfurization ash-based denitrification nitrogen removal filter material can be used for nitrogen removal of nitrate nitrogen-containing wastewater, and the effect is excellent. According to the desulfurization ash-based denitrification nitrogen removal filter material, the sulfur electron donor material serves as a main active component, the main component in desulfurization ash is CaSO3, and + 4-valent sulfur contained in the desulfurization ash and 0-valent sulfur in sulfur have a synergistic effect, so that the oxidation reduction effect with NO3 <-> in water is effectively improved, and the denitrification effect is excellent; the industrial solid waste desulfurization ash and calcium carbonate are compounded to prepare the denitrification nitrogen removal filter material, so that the purposes of treating waste with waste, reducing cost and increasing efficiency are achieved, the dual purposes of high-value utilization of the industrial solid waste desulfurization ash and high-efficiency treatment of wastewater are achieved, and wide market prospects are achieved.

This invention discloses a method and apparatus for constructing a microdroplet self-Fenton system. The construction method includes the following steps: mixing an iron salt with an acidic solution, and subjecting the resulting mixed solution to ultrasonic atomization to form micron-sized droplets, thereby obtaining the microdroplet self-Fenton system. The construction apparatus includes an atomizing reactor for storing the mixed solution and an ultrasonic generator for providing ultrasonic waves. The microdroplet self-Fenton system constructed by this invention has the following advantages: good adaptability, enabling the acquisition of a self-Fenton system under conditions of no light, no catalyst, and no sacrificial agent; it helps to increase the generation rate and yield of ·OH in the system, giving the system stronger redox capabilities and enabling efficient degradation of organic pollutants, providing important guidance for promoting the effective treatment of organic pollutant wastewater; the process is simple, easy to operate, low in cost, environmentally friendly, suitable for industrial applications, and facilitates the effective treatment of organic pollutant wastewater.

The application provides a denitration catalyst, a preparation method and application thereof, and the denitration catalyst comprises a layered MCM molecular sieve carrier and a composite oxide active component loaded on the surface of the layered MCM molecular sieve carrier, and the chemical formula of the composite oxide active component is CeCuO x The denitration catalyst has high surface acidity and redox capacity, the CeCuO x The alkali metal poisoning resistance of the catalyst is improved, so that the catalyst has high catalytic activity and nitrogen selectivity in the use temperature range of 250-400 DEG C after being poisoned by alkali metal.

The invention relates to an immobilized plasma Z-type NiCuBi2O4 / Bi / NiO composite film photocatalyst as well as a preparation method and application thereof. The NiCuBi2O4 film photocatalyst is prepared by taking nickel foil as a substrate and adopting a coprecipitation method, a spin-coating method and a high-temperature calcination method. The NiCuBi2O4 / Bi thin film photocatalyst is prepared through an in-situ reduction method. And finally, preparing the plasma Z-type NiCuBi2O4 / Bi / NiO composite film photocatalyst through a sol-gel method, a spin-coating method and a high-temperature calcination method. The immobilized plasma Z-type NiCuBi2O4 / Bi / NiO composite film photocatalyst with the Ni foil as the substrate is constructed aiming at the problems of agglomeration and recovery in powder photocatalyst reaction, non-noble metal Bi nano particles are introduced to serve as conductive channels, the low-cost plasma resonance effect is achieved, the enhanced catalytic degradation activity is obtained under sunlight, and the photocatalytic degradation effect is improved. Meanwhile, the practical problem that precious metal depends on and powder catalysts are difficult to separate and recover is solved.

This invention relates to the field of composite catalyst technology, specifically to a method for preparing and applying a MOFs-based composite catalyst, comprising the following steps: dispersing modified MOFs and modified GO in a modified solvent, adding N,N'-dicyclohexylcarbodiimide and 4-dimethylaminopyridine; after the reaction, centrifuging to collect the precipitate, washing the precipitate with sufficient modified solvent and anhydrous ethanol, and finally washing with deionized water until the filtrate is clear to obtain a purified product; dispersing the purified product in methanol and refluxing to obtain the modified MOFs-based composite catalyst. This invention utilizes the bimetallic active sites of modified MOFs, the electronic conductivity of modified GO, and the uniformly dispersed structure formed with the assistance of the modified solvent to achieve a synergistic effect of adsorption-mass transfer-catalysis. The catalyst first rapidly adsorbs organic pollutant molecules through its porous structure, then achieves oxidative degradation of pollutants through efficient photogenerated carrier separation, and finally releases degradation products through unobstructed pores.

The application discloses a CO-SCR catalyst, a preparation method and application thereof, and the CO-SCR catalyst comprises a cerium-based composite oxide carrier and a noble metal active component, and the noble metal active component is dispersed on the surface of the cerium-based composite oxide carrier by means of a surfactant. The CO-SCR catalyst utilizes the dispersion and loading of the noble metal assisted by the surfactant, so that the CO-SCR catalyst has higher metal dispersion and redox capacity. Meanwhile, the suitable pH value of the carrier surface is also beneficial to the adsorption of CO and NO, and the low-temperature catalytic activity and high-temperature stability of the catalyst are improved, and the CO-SCR catalyst has higher catalytic activity and nitrogen selectivity in the use temperature range of 250 DEG C to 400 DEG C.

This invention relates to a selenium-iron-copper composite catalyst material, its preparation method, and its applications in the field of materials chemistry. The catalyst uses ferric oxide as a matrix, with selenium powder, iron powder, and copper powder added as active components, and polyol and carboxylic acid as auxiliary agents. The process involves premixing, calcination, and pulverization. The selenium powder content is 1-7 wt% of ferric oxide, the iron powder content is 2-10 wt%, and the copper powder content is 0.5-1.5 wt%. The preferred polyol is glycerol, and the preferred carboxylic acid is crotonic acid. The calcination temperature is 400-800℃. In catalytic testing, under room temperature and air bubbling conditions, this catalyst can achieve a degradation rate of over 90% for tetracycline hydrochloride within one hour. This invention features a simple preparation method, low cost, high catalytic activity, mild operating conditions, and efficient degradation of tetracycline in water, making it suitable for antibiotic wastewater treatment.

The application discloses a Bi2O2CO3 / MIL-68-NH2 composite material and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials and the field of water environment treatment. The composite material is formed by loading Bi2O2CO3 on the surface of MIL-68-NH2 to form a heterojunction structure; the MIL-68-NH2 is a regular hexagonal rod-shaped crystal with a length of 10-20 microns; and the Bi2O2CO3 is a sphere with a diameter of 2-3 microns, and the surface is a carnation-shaped hierarchical stacking structure and is dispersed and loaded on the surface of the MIL-68-NH2. The composite material prepared by the application has the advantages of simple preparation method, strong visible light absorption capacity, stable catalytic performance, high degradation efficiency and the like, and has a potential application prospect in the field of water treatment.

This invention relates to the field of wastewater treatment technology, specifically disclosing a photoanode material, a photoanode, its preparation method, and its application in wastewater treatment. The photoanode material comprises an FeSe2 array layer and a Bi2O2WO4 layer supported on the FeSe2 array layer. FeSe2 has a narrow band gap, good light absorption performance, and photogenerated charge separation capability, which can sensitize other semiconductors with wider band gaps to form heterojunctions, promoting the improvement of photocurrent density and electron quantum yield, and enhancing the photoelectric conversion efficiency of the catalytic material. Bi2O2WO4 is composed of [Bi2O2]. 2+ Layers and [WO4] 2‑ The vertically alternating layers facilitate the separation of photogenerated electrons and holes, thereby enhancing the catalytic oxidation activity of the electrode. The combination of Bi₂O₂WO₄ and FeSe₂ improves their respective solar photoresponse capabilities and photoelectrocatalytic performance, offering significant advantages in environmental engineering.

The invention belongs to the field of polishing materials, and relates to boron-doped cerium oxide for a polishing solution as well as a preparation method and application of the boron-doped cerium oxide. In the boron-doped cerium oxide, the molar ratio of the boron element to the cerium element in the cerium oxide is 1: 1-1: 10. The boron-doped cerium oxide is prepared by carrying out co-precipitation reaction on cerium salt and a boron source to generate a precursor, and calcining the precursor. The boron element is introduced into cerium oxide crystal lattices, so that the problems of low chemical activity and poor polishing performance of traditional cerium oxide due to insufficient content of trivalent cerium are effectively solved. After boron is doped, an oxygen coordination environment in a cerium oxide crystal lattice is changed, part of oxygen atoms are converted from tetra-coordination combined with tetravalent cerium into tri-coordination combined with trivalent boron, and the structure change induces generation of more oxygen vacancies, so that the proportion of trivalent cerium in the material is remarkably increased.

This invention discloses a layered manganese dioxide-coated gold nanoparticle photocatalyst and its preparation method, belonging to the field of photocatalytic nanomaterials technology. The preparation method is as follows: S1, tetrachloroauric acid and a quaternary ammonium salt are added to a sodium borohydride solution and stirred at 25-120℃ for 1-3 hours to obtain solution A; solution B containing the quaternary ammonium salt, tetrachloroauric acid, and ascorbic acid is prepared; solutions A and B are mixed and stirred at 25-50℃ for 1-15 hours to obtain Au nanoparticles; S2, after centrifuging the Au nanoparticle dispersion to remove the supernatant, it is added to solution C, which is composed of methoxy polyethylene glycol carboxyl groups, potassium permanganate, a reducing agent, and polyethylene glycol, and stirred at 25-50℃ for 1-5 hours to obtain layered manganese dioxide-coated gold nanoparticles. This invention, by introducing methoxy polyethylene glycol carboxyl groups, prepares a catalyst with unique layered manganese dioxide-coated gold nanoparticles for the photocatalytic conversion of 5-hydroxymethylfurfural.

This invention belongs to the field of environmental materials, specifically relating to a method for preparing and applying a composite pollutant treatment agent, comprising the following steps: Step 1, dissolving polyacrylonitrile in N,N-dimethylformamide, stirring thoroughly to obtain a spinning solution, and performing electrospinning to obtain an electrospun polyacrylonitrile film; Step 2, pre-oxidizing the electrospun polyacrylonitrile film in an air atmosphere to obtain a pre-oxidized polyacrylonitrile film; Step 3, carbonizing the pre-oxidized polyacrylonitrile film under nitrogen protection to obtain electrospun carbon fibers; Step 4, dissolving bismuth nitrate in ethylene glycol, and obtaining a bismuth nitrate / ethylene glycol solution by magnetic stirring; Step 5, purifying anhydrous ethanol by dehydration using a 3A molecular sieve; Step 6, mixing the bismuth nitrate / ethylene glycol solution obtained in Step 4 with the anhydrous ethanol obtained in Step 5, adding the electrospun carbon fibers obtained in Step 3, performing a hydrothermal reaction, and washing and drying the reaction product to obtain Bi2O supported on carbon fibers with both adsorption and degradation effects. 2.33 / Bi2O3 composite pollutant treatment agent. This composite pollutant treatment agent is used for the catalytic degradation and adsorption of organic pollutants in wastewater.