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114results about How to "Improve photocatalytic activity" patented technology

Tetrapod-like zinc oxide/graphene composite material and preparation method thereof

The invention relates to a tetrapod-like zinc oxide/graphene composite material and a preparation method thereof. The composite material is formed by growing a graphene nano sheet on the surface of tetrapod-like zinc oxide and belongs to the fields of novel micro-nano material and material preparation. The method comprises the following steps of step1, preparing reaction precursor liquor containing zinc nitrate or zinc acetate and oxidized graphene, wherein the pH value is 8 to 13; step 2, carrying out hydrothermal reaction of the precursor liquor prepared in step 1 at the temperature of 100 to 200 DEG C to prepare a reaction midbody; and step 3, calcining the midbody obtained in the step 2 in an environment of 200 to 680 DEG C while controlling the heating rate at 3 to 8 DEG C per minute to obtain the tetrapod-like zinc oxide/ graphene composite material. By adopting the tetrapod-like zinc oxide/graphene composite material and the preparation method thereof, the defect of existing tetrapod-like zinc oxide that the catalyzing efficiency is low and the clustering problem of the oxidized graphene in the reduction process can be solved. The tetrapod-like zinc oxide/graphene composite material is expected to be popularized in the fields such as heat conduction, piezoelectricity, voltage-sensitive, wave absorption, sound absorption, vibration absorption, antibiosis, anti-weeds, catalysis and the like.
Owner:BEIJING JIAOTONG UNIV

Device and method for treating high-salinity and degradation-resistant organic industrial waste water by performing photoelectrical synchro coupling and catalytic oxidation on three-dimensional particles

InactiveCN102874960AGood conductivityImprove photocatalytic activityMultistage water/sewage treatmentSurface coatingCatalytic oxidation
The invention discloses a device and a method for treating high-salinity and degradation-resistant organic industrial waste water by performing photoelectrical synchro coupling and catalytic oxidation on three-dimensional particles. An anode rod compounded with a titanium-based coating, a stainless steel cathode rod and ultraviolet source condensers are arranged in a reaction device, compressed air is introduced, a nano semiconductor oxide surface coating ceramic medium serving as a carrier is in a suspension state, a hydroxyl radical is formed on an anode under the synchro coupling action of electrolytic oxidation desalination and photo-catalytic oxidation in the alkaline environment, Cl<-> in waste water is oxidized on the anode to generate Cl2, the Cl2 spreads into a solution for hydrolysis to generate ClO<->, and the ClO<-> can oxidize organic matters in the waste water and desalt the waste water; under the action of the ultraviolet source condensers, organic pollutants in the waste water are degraded; and by a side reaction, namely an oxygen evolution reaction during electrolysis, high-density dissolved oxygen is generated, and a hydroxyl radical .[OH] is generated by reacting the dissolved oxygen with nano semiconductor oxide photoinduced electrons, so that the activity of photo-catalytic oxidation reaction is enhanced, the mineralization and removal rates of degradation-resistant organic impurities in the waste water are increased, and the process is easy and convenient to operate.
Owner:HUBEI ZHONGBI ENVIRONMENTAL PROTECTION TECHCO

Preparation method of TiO2 nanowire photocatalyst modified by Au nanoparticles

The invention discloses a preparation method of a TiO2 nanowire photocatalyst modified by Au nanoparticles. The preparation method comprises the following steps: performing ethanol washing and acid washing on a titanium sheet respectively to remove surface greasy dirt and an oxidation layer, polishing the surface till the surface is uniform and smooth, performing oxidation treatment by an anodic oxidation method, performing anodic oxidation treatment by adopting a stepwise pressure-increasing method, and calcining in air after oxidation treatment; and modifying TiO2 nanowires with the Au nanoparticles by adopting an adsorption-photoreduction method, immersing the TiO2 nanowires into a chloroauric acid solution, illuminating by an ultraviolet lamp while stirring, washing with deionized water after treatment and drying. According to the preparation method disclosed by the invention, the photocatalytic activity is relatively high under irradiation of simulated sunlight, and the utilization of visible light is improved; furthermore, the preparation method is simple and the reaction is convenient to control; and as the immobilized photocatalyst, the separation from water is convenient, the new pollution is avoided, organic pollutants in a water body are removed, and the photocatalyst has good stability and reusability.
Owner:QINGDAO AGRI UNIV

Iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst and preparation method thereof

The invention provides an iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst and a preparation method thereof, and relates to sewage and waste gas treatment. The iron and chrome co-doped nano titanium dioxide/zeolite compound photocytalyst is characterized in that: nano TiO2 is doped with 0.5 to 2.5 weight percent of iron and chrome ions; the mass ratio of Fe3+ to Cr3+ is controlled to be 1:1-4; the Fe3+ and Cr3+ ions and Ti4+ ions with positive electricity are self-assembled on a zeolite substrate modified by negative electricity under the action of electrostatic attraction, the metal ions are combined together and then the zeolite substrate is baked to prepare the photocatalyst; and nano TiO2 crystals are mixed crystals of anatase crystals and rutile crystals. The iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst has the advantages that: compared with the prior art, the compound material has the photocatalytic activity improved by over 40 percent, is filtered and dried for recycling, and then can still have relatively high photocatalytic activity; and the iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst has the advantages of low cost, easy recycling, no pollution, great social and economic benefits, and good industrial application prospect.
Owner:河北地质大学

Method for synthesizing monoclinic phase mesoporous bismuth vanadate through template method

The invention relates to a method for synthesizing monoclinic phase mesoporous bismuth vanadate through a template method. The method comprises the following steps of: mixing nitric acid, ethanol and bismuth nitrate which are weighed in a mass ratio of 1:(2.8-28):(0.2-1) by ultrasonic wave, so as to obtain a bismuth nitrate solution; mixing nitric acid, ethanol and ammonium meta-vanadate which are weighed in a mass ratio of 1:(2.8-28):(0.05-0.25) by ultrasonic wave, so as to obtain an ammonium meta-vanadate solution; dropping the ammonium meta-vanadate solution slowly into the bismuth nitrate solution, so as to obtain a mixed solution; adding silicon dioxide aerogel microspheres to be used as a template, evacuating in order to fully inject the mixed solution in the template, reacting for 6 hours to 24hours at the temperature of 60 DEG C to 110 DEG C, so as to obtain solid products; and finally, heating the solid products to 160 DEG C to 400 DEG C in a tube furnace at the heating rate of 0.5 DEG C per minute to 10 DEG C per minute, roasting for 2 hours to 24 hours, naturally cooling to room temperature, and then removing the template by using a sodium hydroxide solution to obtain the monoclinic phase mesoporous bismuth vanadate with average aperture distribution (1nm to 20nm). The method provided by the invention is simple and easy to control in process and is environment-friendly; and the monoclinic phase mesoporous bismuth vanadate obtained by the method has excellent photo-catalytic performance within the range of visible light.
Owner:TONGJI UNIV
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