38results about How to "High catalytic degradation activity" patented technology

The invention discloses a method for removing an organic pollutant in water. The method comprises the following steps: 1) regulating the pH (potential of Hydrogen) of a to-be-treated water body to 3 to 9 by using a pH regulator; 2) adding hydroxylamine, peroxymonosulfate (PMS), percarbonate and a bivalent copper ion into the treated water body in the step 1), and carrying out an agitation reactionat a set temperature, so that the treatment of the organic pollutant in the water is completed after the reaction is completed. According to the method, Cu<2+> is reduced to be Cu<+> by using the hydroxylamine; next, the Cu<+> is oxidized to be Cu<3+> by utilizing the PMS and the percarbonate; the generated Cu<3+>, compared with a sulfate-radical free group and a hydroxyl-group free group which are generated by the activation of the PMS, is higher in catalytic degradation activity and therefore, is quicker in the degradation speed of the organic pollutant; secondly, the Cu<2+>, the Cu<+> andthe Cu<3+> are in a cyclic process in a sewage treatment process; therefore, a small amount of the Cu<2+> only needs to be added, so that the degradation reaction of the organic pollutant can be guaranteed to be carried out and the secondary pollution is difficultly caused.

The invention discloses an anodization two-step preparation method of a cuprous oxide nanosheet powder material. The method comprises the following steps: anodization: using an ammonium chloride buffer solution as an electrolyte, regulating the pH value of the electrolyte to 4-10, and carrying out anodization reaction by using a copper foil as the anode and a graphite electrode or platinum electrode as the cathode; and foaming treatment: after the reaction finishes, cleaning the copper foil, drying, immersing the copper foil in a low-concentration oxydol solution, carrying out foaming reaction for 10-60 minutes, taking out, flushing, and drying to obtain the cuprous oxide nanosheet powder material which is attached to the copper foil substrate. The preparation technique disclosed by the invention is simple and easy to implement, has the advantages of low energy consumption, low cost and no pollution, is suitable for mass production, and has very important meanings for saving the energy sources and resources and improving the environment; and the prepared powder material has the advantages of large specific area and high catalytic activity, can be well attached to the substrate, and is convenient for recovery and reutilization.

The invention relates to the field of environmental protection, and discloses a low-energy chemical field-driven organic pollutant degradation catalyst and an application thereof. The catalyst can efficiently degrade azo dyes, nitro compounds and various other organic pollutants without providing additional energy. The catalysis system uses formate as an assistant, metallic palladium, silver, gold, platinum and iridium are used as catalytic active main bodies and are supported on the surface of a carrier oxide, C-H bonds in formate radicals are broken when the formate ions in a mixed solutionof the formate and organic pollutants are in contact with a transitional noble metal interface in order to form reactive oxygen species, the reactive oxygen species include hydroxyl radicals, hydrogenperoxide radicals, carbonate radicals and the like, and the generated free radicals rapidly oxidize adsorbed organic matters into small-molecular substances which can be naturally degraded, or even nontoxic water, CO2 or carbonates. The catalyst has the advantages of extremely high efficiency in organic pollutant degradation treatment, low cost, stable catalysis system and high recycling rate.

The invention provides an indium zinc sulfide/zinc ferrite composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: a) mixing an iron source, a zinc source and polyvinylpyrrolidone in the presence of a first solvent, performing electrostatic spinning, and calcining to obtain ZnFe2O4 nanofibers; and b) mixing a zinc source, an indium source and a sulfur source in the presence of a second solvent, adding the ZnFe2O4 nanofiber obtained in the step a), and carrying out solvothermal reaction, so that the obtained ZnIn2S4 nanosheet is loaded on the ZnFe2O4 nanofiber to obtain the indium zinc sulfide/zinc ferrite composite photocatalyst. Compared with the prior art, the preparation method provided by the invention has the advantages that a two-dimensional ZnIn2S4 nanosheet photocatalyst is loaded on one-dimensional zinc ferrite (ZnFe2O4) nanofibers through a low-temperature solvothermal method, so that the ZnIn2S4/ZnFe2O4 nano composite material is obtained, and the composite material can be used for carrying out photocatalytic degradation on waste gas so as to effectively treat the waste gas.

The invention discloses a universal preparation method and application of a hierarchical-pore nitrogen-doped carbon catalyst synthesized on the basis of double pore-foaming agents. The preparation method comprises the following steps: mixing biomass chitosan, ethylenediamine tetraacetic acid cobalt disodium salt and a molecular sieve SBA-15 with water, and carrying out drying to obtain a materialA; heating the material A from room temperature to 300 DEG C for 60 min under the protection of inert gas, keeping the material A at 300 DEG C for 60 min, heating the material A to 800 DEG C at a heating rate of 10 DEG C/min, keeping the material A at 800 DEG C r 120 min, and carrying out natural cooling to room temperature to obtain a material B; and adding the material B into an acidic solution,soaking the material B for 12 h, washing the material B with high-purity water until a filtrate is neutral, and carrying out drying at 40-60 DEG C for 12 h to obtain the target product, i.e., hierarchical-pore nitrogen-doped carbon catalyst. The hierarchical-pore nitrogen-doped carbon catalyst has a specific surface area of 661-925 m<2>/g, contains a large number of micropores and mesopores, canefficiently degrade organic pollutants when applied as a positive electrode material to an electro-Fenton system, and is free of secondary pollution and friendly to environment in use.

The invention discloses a method for preparing bowknot-shaped fluorine-oxygen-bismuth photocatalyst and an application of the catalyst. The method comprises the following steps that bismuth nitrate pentahydrate is added in water, the adding amount is 0.4g/15mL to 0.5g/15mL according to the volume of the water, stirring is conducted for 15 to 20 min, and stirring is conducted continuously for 5 to 15 min to form mixing solution; then the mixing solution is added into a linear made of teflon to conduct hydrothermal reaction; cooling is conducted after the reaction is finished, centrifugation is conducted, sediment is obtained, and the bowknot-shaped fluorine-oxygen-bismuth photocatalyst BI7F1105 is obtained by drying and washing. The method for preparing the bowknot-shaped fluorine-oxygen-bismuth photocatalyst has the advantages that the prepared bowknot-shaped fluorine-oxygen-bismuth photocatalyst can be existed stably, the form is good, the bowknot-like shape is not reported ever, and the ability of catalytic degradation on organic matters is higher than that of the normal TiO2 catalyst.

The present invention has prepared a kind of g-C ₃ N ₄ A photocatalyst compounded with polymer poly1,4-diphenylbutadiyne (PDPB) and applied to the degradation of rhodamine B dye. The main feature of the present invention is that the g-C ₃ N ₄ Mix and stir with PDPB in the solvent, make g‑C by evaporating the solvent ₃ N ₄ Compounded with PDPB. The preparation method adopted by the invention is simple and easy to operate, has low cost, high yield and less environmental pollution. Meanwhile, the photogenerated electrons and holes of the catalyst prepared by the invention can be effectively separated, and the photocatalytic activity is significantly improved. Through the degradation of rhodamine B under visible light, it is proved that this CN‑PDPB composite has higher visible light catalytic activity than pure carbon nitride and pure PDPB.

The invention discloses a universal method for preparing a hierarchical pore coexisting heteroatom doped carbon catalyst by using a soft template agent, and applications of the hierarchical pore coexisting heteroatom doped carbon catalyst, and belongs to the technical field of synthesis of porous carbon materials. The technical scheme comprises: uniformly mixing biomass, a soft template agent anda doping agent to obtain a material A; heating the material A for 60 min to achieve 300 DEG C from a room temperature under the protection of inert gas, keeping the temperature for 120 min, heating to800 DEG C at a heating rate of 3 DEG C/min, keeping the temperature for 120 min, and naturally cooling to a room temperature to obtain a material B; and washing the material B with a hydrochloric acid solution, and drying at 105 DEG C for 12 h to obtain the hierarchical pore coexisting heteroatom doped carbon catalyst. According to the invention, the electrochemical performance of the synthesizedheteroatom-doped carbon catalyst is tested by using a rotating disc to screen the electrode material subjected to a two-electron reaction, and the screened material as a cathode material is used in an electro-Fenton degradation system to efficiently degrade organic pollutants, so that the work of the screening of the electrode material is reduced, and secondary pollution cannot be caused in the using process.

The invention discloses a Fe(III)-Salen functionalized nano Fe3O4 composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an amino-functionalized nano Fe3O4 magnetic composite material (NH2-nFe3O4) by adopting a solvothermal method, condensing with o-hydroxy-containing substituted benzaldehyde so as to obtain Salen functionalized nano Fe3O4 (nFe3O4@Salen), and further complexing with Fe(III), thereby obtaining the nFe3O4@Fe(III)Salen composite material. The product obtained by the method disclosed by the invention is powdered and brown, and is uniform in particle size distribution and stable in property. NH2-nFe3O4 prepared by the solvothermal method overcomes the defect of agglomeration of a magnetic material solution, and the obtained material is high in dispersity and excellent in magnetic property; Salen obtained by condensing amino and o-hydroxy-containing substituted benzaldehyde is fast in reaction, readily available in raw materials and high in yield; the material is enriched in amino, hydroxyl and other functional groups; and due to the Fe(III) active center, a Fenton-like system is immobilized onto the magnetic Fe3O4 material, the composite material has a wide pH application range, dual functions of catalysis and magnetism of the material are realized, and separation and recovery of catalysts are promoted.

The invention discloses an application of CeGeO4. CeGeO4 as a catalyst has catalytic activity under an illumination condition and also can degrade organic dye pollutants under a completely lucifugal room temperature condition, and an application scope of CeGeO4 is enlarged. CeGeO4 ha apparently higher activity of catalytic degradation of rhodamine B (RhB) and methylene blue (MB) dyes under the completely lucifugal condition as compared with a CeO2 catalyst. CeGeO4 does not require illumination and has higher activity during catalytic degradation of the dyes; a preparation method of CeGeO4 is simple; a preparation condition is mild; and the popularization and application of CeGeO4 is facilitated.

The invention relates to a lighting lamp with an air purification function. The lamp comprises an electric light source, a lamp holder and a lampshade. The outer surface of the lampshade is evenly sprayed with a photocatalyst film, the photocatalyst film is prepared from a photocatalyst and a film forming agent, and the photocatalyst is formed by gathering bismuth titanate nanosheets and titaniumcarbide nanosheets on nanometer aluminum oxide particles and is provided with a porous surface; air purification is combined with a daily lighting lamp, indoor air is purified while lighting is conducted, multi-functionalization of the lighting lamp is achieved. The lighting lamp has the advantages of being good in purification effect and long in service life.

The invention discloses an application of Ce(IO3)4, and provides an application example of the compound for the first time. As a catalyst, the Ce(IO3)4 can degrade organic dyestuff pollutants under a condition of completely lucifugal room temperature. The Ce(IO3)4 catalyzes and degrades the activity of Rhodamine B (RhB) and methyl orange (MO) dyestuff under a completely lucifugal condition, and is apparently superior to a commercial titanium dioxide (P25) photocatalyst under visible light irradiation. When the Ce(IO3)4 disclosed by the invention catalyzes and degrades dyestuff, illumination is not required; the activity is relatively high; the preparation method for the Ce(IO3)4 is simple; the preparation condition is mild; therefore, the Ce(IO3)4 is favorably popularized and applied.

The present invention discloses applications of cerium hydrogen iodate tetrahydrate (CeHIO6.4H2O), and firstly provides the application example of the compound. According to the present invention, the cerium hydrogen iodate tetrahydrate adopted as a catalyst can degrade organic dye contaminants at a room temperature under a completely dark condition; the methyl orange (MO) dye catalytic degradation activity of CeOIO6.4H2O under a completely dark condition is significantly higher than the methyl orange (MO) dye catalytic degradation activity of commercial titanium dioxide (P25) photocatalysts under visible light irradiation; CeHIO6.4H2O is highly durable, wherein the activity is not significantly reduced after CeHIO6.4H2O is recycled 3 times in the MO degradation experiment; when the CeHIO6.4H2O performs the catalytic degradation of dyes, the characteristics of no requirement of illumination, high activity and high durability are provided; and the preparation method is simple, the preparation condition is mild, and the method is suitable for popularization and application.

The invention relates to the technical field of photocatalysts, and particularly discloses an In2O3 photocatalyst for degrading perfluorooctanoic acid and a preparation method of the In2O3 photocatalyst. The preparation method comprises the following steps: S1, dissolving indium salt and urea in water to form a precursor solution; s2, heating and reacting the precursor solution, and separating to obtain a solid; and S3, taking the solid, and calcining to obtain the In2O3 photocatalyst. The invention also discloses an application of the In2O3 photocatalyst in the treatment of refractory organic pollutants. The space group of the In2O3 photocatalyst provided by the invention is Ia-3, the exposed crystal faces comprise {110} Ia-3 and {111} Ia-3, and the In2O3 photocatalyst provided by the invention has more suitable surface interaction strength and higher catalytic degradation activity under the combined action of the two exposed crystal faces, and can be used for strengthening treatment of nondegradable organic matters such as perfluorooctanoic acid.