42results about How to "Rich in active sites" patented technology

The invention belongs to the technical field of a nano titanium dioxide photocatalyst, and particularly relates to a copper and bismuth co-doped nano titanium dioxide photocatalyst and preparation and application thereof. In the photocatalyst, in molar fraction, the doping amount of copper is 0.2-3.0%, and the doping amount of titanium is 0.5-5.0%. The copper and bismuth co-doped nano titanium dioxide photocatalyst disclosed by the invention is in an anatase type, is used for the reaction for preparing methane, methanol, and the like by photocatalytic reduction CO2, has the advantages that the photon efficiency is high, specific surface area is large, and CO2 adsorption ability is strong, and simultaneously, has visual photocatalytic activity and high sunlight utilization rate.

The invention provides a preparation method of an ozone catalytic decomposition catalyst using expandable graphite as a carrier. The method comprises the following steps: sequentially carrying out ozone oxidation, chemical oxidation intercalation, diethylenetriamine amination and cerium ion impregnation loading treatment on flake graphite, and then carrying out microwave expanding treatment to obtain active component cerium supported expanded graphite; and carrying out impregnating treatment, manganese ion loading treatment and high temperature sintering treatment on the prepared expanded graphite to prepare the catalyst adopting the expanded graphite as the carrier and loaded with active components cerium and manganese. The prepared catalyst can highly-efficiently catalyze ozone to generate hydroxy free radicals in order to realize excellent removal of non-degradable highly-toxic organic pollutants in the water environment, so the catalyst has an expected application prospect in the field of wastewater pollution treatment.

The invention discloses a preparation method of a ferric oxide/attapulgite/three-dimensional graphene oxide heterogeneous catalyst. According to the catalyst, a carrier prepared from attapulgite and three-dimensional graphene oxide through compounding is adopted, the carrier is loaded with ferric oxide nanoparticles, and the catalyst can be applied to catalyzed degradation treatment of refractoryorganic wastewater. The preparation method comprises the steps of firstly, purifying and activating the attapulgite, mixing the activated attapulgite with home-made graphene oxide, carrying out molding, carrying out drying, and then, loading the surface of the attapulgite/three-dimensional graphene composite carrier with the ferric oxide nanoparticles, thereby obtaining the ferric oxide/attapulgite/three-dimensional graphene oxide heterogeneous catalyst. The preparation method of the catalyst is relatively simple, does not need special equipment and is low in cost and good in repeatability; the prepared catalyst is good in catalysis performance and wide in pH range, can be reused and can be used at the temperature of 20 DEG C to 80 DEG C. Secondary pollution is not caused, and the catalystcan be extensively applied to the fields of treatment of the refractory organic wastewater.

The invention provides a device and method for preparing biodiesel through a rotary fixed bed fast reaction. The device is mainly composed of a fixed bed reactor with a rotary shaft (9). Firstly, the fixed bed reactor filled with a solid catalyst is added to reactant methyl alcohol, and meanwhile a motor (12) is started to enable a reaction still to rotate. The dropping speed of raw material oil is controlled, and the oil and excessive methyl alcohol are subjected to the fast reaction. The contact chance of the reactant and the catalyst can be increased through rotating, more active point locations can be occupied, and sinking and separation of fatty acid methyl ester can be promoted. By means of a liquid redistributor, the phenomenon that liquid is unevenly distributed due to rotary centrifugation is avoided. The layering condition of sight glass (21) is observed, and products are removed in time. A forward reversible reaction can be accelerated through excessive methyl alcohol, timely removal of the products and the rotary reaction still. The advantages of being easy to operate, high in raw material utilization rate, high in esterification efficiency and the like are achieved, and the device and method can be used for fast and continuous preparation of the biodiesel.

The invention discloses a flower cluster shaped calcium vanadate microsphere and a preparation method thereof. The method has the advantages of easy availability of raw materials, simple process, lowenergy consumption, less agglomeration and easy implementation, wherein ethylene glycol and water are used as double solvents, the flower cluster shaped calcium vanadate microsphere can be formed, andthe clusters in each flower cluster shaped calcium vanadate microsphere are more dense; by using double solvents, the overall reaction time is shortened; at that same time, a high-pressure reaction kettle is adopted, the temperature and pressure can be controlled, and the close reaction environment makes the size of the prepared flower cluster shaped calcium vanadate more uniform, and the qualification rate of the shape of the flower cluster shaped calcium vanadate microsphere is higher, and the prepared flower cluster shaped calcium vanadate microsphere are in the flower cluster shape, and the clusters are dense, so that the active sites in the microspheres are more and the specific surface area is larger; when the microspheres are applied to the conductive thin film materials, the ion transport rate of the microspheres is high, the electron transport ability is strong, and the conductive ability is strong because of the large number of active sites.

The invention discloses a preparation method of a double-quantum dot modified flower-like three-dimensional graphene and a photocatalytic material. Specifically, the method includes: preparing three-dimensional graphene on foam nickel; preparing an electrodeposition precursor solution containing Au; and preparing an Au@TiO2@3DGFs composite material by electrochemical deposition: putting a three-dimensional graphene into the precursor solution to serve as a working electrode for deposition of TiO2 and noble metal Au double quantum dots, thus forming flower-like three-dimensional graphene with Au and TiO2 double quantum dots evenly distributed on the surface in the electrochemical deposition process. The three-dimensional graphene electron-hole pair prepared by the method provided by the invention has the characteristics of low recombination rate, high photoelectrocatalytic activity, and high sunlight utilization.

The invention relates to a self-supporting layered bimetallic phosphide-graphdiyne composite catalyst. The catalyst comprises a carrier and an active component, and the active component is a self-supporting layered composite material formed by uniformly dispersing bimetallic phosphide nano particles on graphdiyne; the composite material has a multi-stage ordered structure, and an atomic-scale heterojunction structure is arranged between bimetallic phosphides; the carrier is selected from one or more of foamed nickel, foamed copper, carbon cloth, aluminum oxide and titanium oxide; and the double metals are selected from two of copper, nickel, iron, cobalt, manganese, zinc and molybdenum. The nano electrocatalyst has abundant interface defects and vacancies, enriches active sites, improves the electron interaction, and improves the electrocatalytic performance. In the whole water separation process, the stability is excellent, attenuation will not happen within 24 hours, and the catalyst is suitable for the fields of HER, OER and electrochemical complete water splitting.

The invention discloses a preparation method of MnFe2O4-TiO2-graphene aerogel. The preparation method comprises the following steps: (1), mixing a graphene oxide aqueous solution with absolute ethyl alcohol, then carrying out ultrasonic treatment, y adding ferric nitrate and manganous nitrate salt solutions, then adding polyethyleneimine for ultrasonic treatment, and finally adding tetrabutyl titanate for ultrasonic treatment to form a good dispersion liquid; (2), transferring the dispersion liquid into a high-temperature and high-pressure reaction kettle for reaction; and (3), after finishingof the reaction, taking out the sample, soaking the sample in ammonia water (10v/v%), and soaking the sample in 20% ethanol before freeze drying to prepare MnFe2O4-TiO2-graphene aerogel. According tothe preparation method, aerogel is synthesized through a one-step hydrothermal method, reduction of graphene oxide is promoted through addition of polyethyleneimine, self-assembly of the aerogel is easier to complete, and amino is introduced to enhance the mechanical strength of the aerogel. The preparation method of the aerogel is simple and convenient, the aerogel serving as a catalyst is easyto recycle, secondary pollution is reduced, and the visible light utilization rate is increased.

The invention belongs to the technical field of electrode base materials, and provides a preparation method of titanium foam. The method comprises the steps that coke is adopted as a pore forming agent and mixed with titanium powder to be sintered, the pore forming agent is removed, and the titanium foam is obtained, wherein the volume ratio of the coke to the titanium powder is (0.5-2):1, the grain size of the coke is 1-6 mm, the sintering temperature is 1,400-1,600 DEG C, and the grain size of the titanium powder is 400 meshes. The preparation method specifically comprises the following steps that S1, the coke and the titanium powder are compacted after being mixed to obtain a mixed sample; S2, the mixed sample is sealed, vacuumizing is performed repeatedly, argon is introduced till foreign gas is exhausted; S3, the temperature is increased to 1,400-1,600 DEG C, and sintering is performed; and cooling is performed to the room temperature to obtain a titanium foam midbody; S4, the midbody is placed into a coke gasification small fixed bed reaction device, the temperature is increased to 1,100 DEG C, CO2 is introduced with the flow being 400-600 ml/min, the reaction is performed for a period of time, heating is stopped, cooling is performed to reach the room temperature. According to the technical scheme, the prepared titanium foam is adopted as an anode, electro-catalysis treatment is performed on the coked wastewater, the number of active loci is large, and the degradation efficiency is high.