54results about How to "High photocatalytic degradation rate" patented technology

The invention discloses a preparation method for a composite photocatalyst Bi2O3 / g-C3N4. The preparation method comprises the following steps: preparing g-C3N4, namely calcining a carbon and nitrogen source at the temperature of 400-1000 DEG C to prepare g-C3N4; mixing Bi2O3 solid with the g-C3N4 prepared in step 1, and grinding; calcining the grinded mixture at the temperature of 400-1000 DEG C to prepare the composite photocatalyst Bi2O3 / g-C3N4. The invention further discloses application of the composite photocatalyst Bi2O3 / g-C3N4 prepared by the method in sewage treatment, in particular, in the aspect of dye sewage.

The invention discloses a method for photocatalytic degradation of organic pollutants by using a defective metal organic framework photocatalyst, which adopts the defective metal organic framework photocatalyst to perform photocatalytic degradation on organic pollutants, wherein the defective metal organic framework photocatalyst is prepared by solvent thermal reaction under the action of an acidregulator and taking ferric trichloride hexahydrate and terephthalic acid as raw materials, and N, N-dimethyl formamide as a solvent; the defective metal organic framework photocatalyst is a defect type MIL-53 metal organic framework photocatalyst. The method for photocatalytic degradation of organic pollutants by using the defective metal organic framework photocatalyst has the advantages of simple process, convenient operation, low cost, easy recycling, high treatment efficiency, high degradation rate and the like, can achieve effective and rapid degradation of organic pollutants, and has good application prospect in the actual treatment of the organic pollutant wastewater.

The invention provides a light source device for removing organic matters and heavy metal ions by visible light. The light source device adopts a visible light LED (Light Emitting Diode) as a light source. The invention further provides a preparation method of the light source device for removing the organic matters and the heavy metal ions by the visible light. The light source device disclosed by the invention has high removing rate of the organic matters and the heavy metal ions, can be used for treating pollutants in water and can also be used for degrading the pollutants in the air; meanwhile, the light source device can also be used for common illumination. Compared with the prior art, the light source device has the advantages of high photocatalytic degradation rate, no pollution, long service life, low cost and the like, and is good for large-scale application and universalness of photocatalysis, and the preparation method is simple.

The invention relates to a preparation method for a functional foam carbon for photocatalytically degrading formaldehyde. The preparation method for the functional foam carbon for photocatalytically degrading formaldehyde includes the following steps: (1) preparation of polyurethane foam carbon; (2) preparation of the functional foam carbon for photocatalytically degrading formaldehyde. The prepared polyurethane foam carbon shows a developed reticular structure, and polyurethane and active carbon are tightly combined. Supported TiO2 is mainly distributed on the pore surface of the foam carbon. The removal of formaldehyde by the TiO2-supported functional foam carbon is shown as the synergism between adsorption and photocatalytic degradation, the rich foam-like pore structure provides a large number of attachment points for formaldehyde gas, TiO2 photocatalytically degrades the formaldehyde gas into small molecules under radiation by ultraviolet light, and a high added active carbon amount and a doped TiO2 amount are both favorable for the removal of the formaldehyde gas. When the added active carbon amount is 35 percent and the doped TiO2 amount is 2 percent, the photocatalytic degradation rate is highest, reaching 85.3 percent.

The invention relates to an attapulgite-graphite-like carbonitride composite hollow fiber microfiltration membrane with photocatalytic performance and a preparation method and application thereof. The preparation method comprises the following steps: adding attapulgite-graphite-like carbonitride composite particles into a solvent to prepare a polyethersulfone casting solution, extruding the casting solution through a spinning nozzle, passing through a section of air gap and entering coagulation bath for curing molding, and sintering to obtain the attapulgite-graphite-like carbonitride composite hollow fiber microfiltration membrane with photocatalytic performance. The hollow fiber microfiltration membrane is composed of fibrous attapulgite and a graphite-like carbonitride polymer with photocatalytic performance. By the photocatalytic performance of the graphite-like carbonitride, coupling of photocatalysis and membrane separation process can be realized. As the graphite-like carbonitride polymer is uniformly dispersed and immobilized on the attapulgite surface of the membrane through the chemical binding effect, the deficiency that granular graphite-like carbonitride is easy to agglomerate, hard to separate and difficult to reuse during the separate using process is effectively avoided.

The invention discloses a preparation method of a composite visible light photo-catalyst. The preparation method includes the steps of: 1) uniformly dispersing a titanium source and a nitrogen source in ethanol, dropwise adding water to the ethanol to prepare a mixed material; 2) under stirring, evaporative-drying the mixed material to obtain a precursor; 3) moving the precursor to a muffle furnace and calcining the precursor at 300-800 DEG C for 0.5-12 h in the muffle furnace to prepare the TiO2 / g-C3N4 composite visible light photo-catalyst. In the method, the TiO2 and g-C3N4 and the composite TiO2 / g-C3N4 visible light photo-catalyst are prepared at the same time, so that synthesis of the two compounds, TiO2 and g-C3N4, and preparation of the composite catalyst are completed in one step. The method is simple in processes and is easy to achieve industrially. The visible light photo-catalyst has a large quantity of photo-catalytic active centers, and is high in light absorption rate and photo-catalysis activity, and is high in photo-catalytic degradation rate on organic matters.

The invention discloses a CaTi2O5 / CaTi2O4(OH)2 composite micro-nano structure material. The CaTi2O5 / CaTi2O4(OH)2 composite micro-nano structure material is formed by bearing CaTi2O5 nano particles by a CaTi2O4(OH)2 sheet-shaped structure; the thickness of the CaTi2O4(OH)2 sheet-shaped structure is 85nm-100nm and the length and width average size is 1-2.5 microns; and the grain diameter of the CaTi2O5 nano particles is 0.5nm-1.5nm. Furthermore, the invention discloses a preparation method of the CaTi2O5 / CaTi2O4(OH)2 composite micro-nano structure material. The CaTi2O5 nano particles are borne by the CaTi2O4(OH)2 sheet-shaped structure so that the efficient photocatalytic activity is kept and the problems of high probability of clustering and difficulty for recycling are solved; and the use value and the economic benefits of the material in the industrial field are effectively improved. The preparation method has a simple process route, does not need a special device, does not need a surfactant or a template and is low in production cost, so that the preparation method is suitable for large-scale industrial production and the application and development of a photocatalytic technology can be promoted.

The invention discloses a preparation method of a composite visible light photo-catalyst. The preparation method includes the steps of: 1) uniformly dispersing a titanium source and a nitrogen source in ethanol, and dropwise adding water to the ethanol to obtain a mixed material; 2) under stirring, evaporative-drying the mixed material to prepare a precursor; 3) moving the precursor into a muffle furnace and calcining the precursor at 300-800 DEG C for 0.5-12 h in the muffle furnace to obtain the TiO2 / g-C3N4 composite visible light photo-catalyst. In the invention, the TiO2 / g-C3N4 composite visible light photo-catalyst is prepared at the same time of preparing the TiO2 and the g-C3N4, so that synthesis of the two compounds, TiO2 and g-C3N4, and preparation of the composite catalyst are completed in one step. The preparation method is simple and is easy to achieve in industrial production. The composite visible light photo-catalyst has a large number of photo-catalytic activity centers, is high in light absorption rate and photo-catalytic activity, and is high in photo-catalytic degradation rate of organic matters.

The invention discloses a preparation method of a TiO2 / g-C3N4 composite visible-light photocatalyst. The preparation method comprises the following steps: a Ti source and an N source are uniformly dispersed in ethyl alcohol, then water is added dropwise to the ethyl alcohol, and a mixed material is obtained; a precursor is obtained by evaporating the mixed material in a stirring state to dryness; the prepared precursor is transferred into a muffle furnace and calcined in the muffle furnace at 300-800 DEG C for 0.5-12 h, and the TiO2 / g-C3N4 composite visible-light photocatalyst is obtained. The TiO2 / g-C3N4 composite visible-light photocatalyst is prepared during preparation of TiO2 and g-C3N4, and synthesis of TiO2 and g-C3N4 and preparation of the composite catalyst are realized in one step; the process is simple, and industrial production is easy to realize. The composite visible-light photocatalyst has many photocatalytic activity centers and is higher in light absorptivity, photocatalytic activity and rate of photocatalytic degradation of organic matter.

The invention relates to a nickel pyridine methylene phosphonate coordination polymer as well as a preparation method and application thereof. The nickel pyridine methylene phosphonate coordination polymer has a molecular formula of [Ni(4-pmp)(H2O)3]n, belongs to a monoclinic system and has P21 / c space groups, and a space accumulation structure is of a two-dimensional layered structure. The coordination polymer prepared by the method disclosed by the invention has a high photocatalytic degradation rate on methylene blue under visible light conditions, and the degradation rate is up to 71.7%; and after the methylene blue is subjected to photocatalytic degradation of 3 cycles, the structure of the coordination polymer disclosed by the invention is not changed, the coordination polymer has high stability and high photochemical activity, is basically invariable in photocatalytic effect of the methylene blue, can be recycled, meets requirements of green materials, and provides a new selection for degradation of azo dyes.

The invention discloses a photocatalyst for degrading dyes in waste water and a preparation method thereof, belonging to the field of photocatalysis. The photocatalyst for degrading dyes in waste water of the present invention uses mesoporous silica as a carrier, and the nano-zinc oxide doped with copper is loaded on the mesoporous silica carrier; the mass fraction of zinc is 5-40%, copper The mass fraction of elements is 0.1‑5%. The photocatalyst of the invention for degrading dyes in waste water catalyzes and degrades methylene blue or rhodamine B in response to visible light, has low cost, high degradation efficiency and good stability.

The invention discloses an environment-friendly biological hydroxymethyl cellulose photocatalytic composite membrane as well as a preparation method and application thereof, and belongs to the field of photocatalyst preparation and photocatalytic environmental management. The preparation method of the environment-friendly biological hydroxymethyl cellulose photocatalytic composite membrane mainlycomprises the following steps: firstly, ultrasonic assisted bionic extraction of barley straws; secondly, extraction of hydroxymethyl cellulose; thirdly, preparation of a barley straw hydroxymethyl cellulose membrane; fourthly, preparation of the hydroxymethyl cellulose photocatalytic composite membrane. The composite membrane prepared by the preparation method disclosed by the invention, has theadvantages of safety and no toxicity, biodegradability, economy and environment friendliness and low cost; barley straws as agricultural wastes are recycled, so that recyclable development of economyis realized.

The invention relates to preparation of a composite photocatalyst, and particularly relates to a photocatalytic material which is formed by loading a P25 type nano TiO2 / V2O5 composite on foamed nickel having large specific surface area and has high catalytic degradation performance. The preparation method comprises the following steps: dissolving ammonium metavanadate in water, performing wet milling together with P25, impregnating, loading onto the foamed nickel, drying, and calcining at 500 DEG C for 1 hour, thus obtaining the foamed nickel loaded V2O5 / P25 photocatalytic material. According to the invention, the preparation method is simple; no expensive equipment is required; the raw materials are low in price; the mechanical performance is favorable; and the photocatalytic degradation rate and visible light response range of the prepared catalyst are greatly improved in comparison with P25. When the composite photocatalyst is used for degrading harmful gas such as formaldehyde and the like in rooms and automobiles, the problems that the powdery photocatalyst is difficult to recover and regenerate after use and the like can be avoided.

The present invention relates to the preparation of a kind of composite photocatalyst, more particularly relate to loading P25 type nano-TiO on the nickel foam of large specific surface area 2 Composite WO 3 Photocatalyst with good catalytic degradation effect. The preparation method includes: dissolving ammonium tungstate in hot ammonia water, wet grinding with P25, impregnating and loading it on foamed nickel, drying at 100°C and then calcining at 500°C for 1 hour to obtain foamed nickel-supported WO 3 / P25 photocatalytic material. The preparation method of the invention is simple; no expensive equipment is needed; the raw material price is low; the mechanical performance is good; the photocatalytic degradation rate of the prepared catalyst is greatly improved compared with P25; it can be applied to harmful gases such as formaldehyde indoors and in automobiles The degradation of the powder photocatalyst can avoid problems such as recovery and regeneration difficulties after use.