2562 results about "Nano tio2" patented technology

The invention discloses a process for preparing a high efficiency nanometer Tio2 visible light catalyst codoped with metal and non metallic ion, belonging to the photocatalysis technology field. The invention adopts titanic acid ester as precursor, uses metal salt and non-metallic compound as dopant, in accordance with sol-gel method, prepares the nanometer TiO2-based photocatalyst with codoping, high efficiency and visible light catalytic activity, wherein the catalytic activity is greatly higher than that of single-doped TiO2-based catalyst. The invention is characterized by the following: 1. due to codoping of the metal and non metallic ion, discrete localized doping level is formed respectively on the lower part of the conduction band energy level and the upper part of the valence band energy level of the TiO2-based catalyst, thus increasing the absorption of visible light and greatly improving the catalytic activity; 2. the doping level can inhibit the recombination of photogenerated carrier, promote the probability of the photogenerated carrier entering into the photocatalytic reaction and efficiently degrade pollutant molecules.

The present invention relates to a humidity-regulating, odor-removing, antibacterial and mould-proof wallpaper, which can effectively regulate the air humidity, absorb the polluting gases in the air and inhibit the reproduction of bacteria and mould. The wallpaper is produced by the drying, cooling and embossing of a basal paper and pasty material coated on the basal paper. According to weight percentages, the pasty material is made from 20 percent to 60 percent of PVC, 25 percent to 50 percent of filling, 5 percent to 15 percent of titanium pigment, 3 percent to 5 percent of the mixture of nano-ZnO and nano-TiO2, 1.5 percent to 3.5 percent of mould inhibitor, 1.5 percent to 3.5 percent of plasticiser, 0.5 percent to 2.5 percent of viscosity depressant, 1.5 percent to 2.5 percent of stabilizer and 0.5 percent to 1.0 percent of bisphenol A. Firstly, the PVC is made into paste and then uniformly mixed with the bisphenol A and the plasticiser; secondly, after being uniformly mixed with the filling, the paste is uniformly mixed with the titanium pigment, the nano-ZnO, the nano-TiO2 and the mould inhibitor and then the stabilizer; and finally, the viscosity depressant is added to regulate the viscosity of the paste in order to obtain the pasty material, which is then coated on the basal paper. The wallpaper has the advantages of no toxicity, no offensive odor, environment-friendliness, long service life, waterproofness and no deformation.

The invention relates to a preparation method of an odorless environment-friendly humidifying antibacterial paint. The odorless environment-friendly humidifying antibacterial paint basically comprises 12-40% of emulsion, 5-20% of titanium white, 12-20% of kieselguhr, 2-6% of attapulgite, 4-8% of bamboo charcoal powder, 3-10% of nano TiO2/anion powder additive, 5-10% of light calcium carbonate, 5-10% of kaolin, 1-5% of propanediol, 2-5% of assistant and 10-30% of deionized water. The multifunctional humidifying antimicrobial internal wall paint completely satisfies various indexes specified in GB/T9756-2001, has the effects of temperature control, energy saving, environmental protection, moisture absorption and release, humidification, dewing resistance, air refreshing, no odor, deodorization, bacteria and mold inactivation and the like, and is widely used in inner wall application of habitable rooms, classrooms, offices, hospitals and the like.

The invention relates to a kieselguhr-based porous ceramics, a preparation method thereof and a method for loading Ag doped with nano TiO2 on the same, belonging to the technical field of a kieselguhr inorganic material. The kieselguhr-based porous ceramics is made from kieselguhr, a sintering auxiliary agent, a dispersing agent, a binder and water in the weight ratio of 60-92:8-40:0.01-2:0:001-1:100-450. The kieselguhr-based porous ceramics has functions of absorption and filtration, and can absorb granules in fluid when the fluid passes through the lieselguhr-based porous ceramics. Ag doped with nano TiO2 is loaded on the kieselguhr-based porous ceramics to generate kieselguhr-based porous ceramics loading the Ag doped with TiO2. The laden anatase-type nano TiO2 has large specific surface area. The effects of filtration, photochemical catalysis and sterilization of the kieselguhr-based porous ceramics loading the Ag doped with nano TiO2 are greatly increased.

The invention provides a composite smoke denitration catalyst capable of oxidizing zero-valence mercury. The catalyst is composite oxide V2O5-CeO2-WO3/TiO2 or V2O5-CeO2-MoO3/TiO2 based on TiO2 as a carrier, wherein the weight proportion is as follows: the weight percent of TiO2 is 75-100, the weight percent of V is 1-1.5, the weight percent of Ce is 1-5, and the weight percent of W or Mo is 7.5-8.5. The preparation method comprises the following steps: depositing Ce(OH)3 on nano TiO2; dipping ammonium vanadate/ammonium molybdate; and drying and roasting so as to obtain the catalyst; or dipping a commercial SCR (selective catalytic reduction) catalyst in a cerous nitrate aqueous solution, and then drying and roasting. The catalyst provided by the invention maintains the denitraiton efficiency of the original SCR catalyst and simultaneously the oxidation rate of zero-valence mercury is obviously improved, and divalent mercury ions are captured in subsequent dedusting equipment and wet desulphurization system; and the application temperature range of the catalyst is wide, the combination control of emission amounts of nitrogen oxides and mercury in smoke of a fuel coal power plant can be achieved on the promise that the smoke purification facility of the fuel coal power plant is not added.

This invention relates to a method for preparing an activated carbon fiber of Titania particle having nanometer and its usage. The fiber is formed from the activated carbon fiber material loaded with the Titania particles, wherein the mass ratio of the Titania particles is 5~25%. The preparing method uses the sol-gel processing: a) hydrolyzing organic titanium compounds of the TiO2 to the TiO2 collosol, and depositing on the activated carbon fiber, b) drying the colloslo and getting the jel, c) annealing, and transforming to nanometer TiO2 particles compounded in the surface of the fiber, then getting the fiber. The fiber not only maintains the poriness but also enhances the optical catalytic activity of the Titania particle, and can be used for removing the volatile organic contaminant with low concentration, wherein its absorbance can reach to 500mg/g and its optical catalytic dissolution rate can reach to 36%.

The invention provides a method for finishing wool fabric by compositing chitosan/TiO2, which comprises the following steps: A)pretreating fabric; B)preparing composite finishing liquor, taking butyl titanate and dissolving in ethanol, adding diethanolamine, uniformly stirring and adding mixed liquor mixed by ethanol and water, heating, stirring under a backflow state to form nano TiO2 sol; adding chitosan, citric acid and sodium hypophosphate in the nano TiO2 sol, uniformly stirring to obtain the composite finishing liquor; C)finishing wool fabric, placing wool fabric in the composite finishing liquor, dipping and padding twice, wherein mangle expression is 85% and padding temperature is 50-65%; D)predrying; E)baking; F)washing; and G)drying. According to the finishing method, chitosan and nano TiO2 sol are employed as the composite finishing liquor, the finished wool fabric has good antibiosis, shrinkproof, ultraviolet resistance and anti-insolation performances; the finishing method generates no pollution on human body and environment, and the finished wool fabric has good hand feeling.

The present invention provides a method for preparing a nano silver-carrying titanium dioxide antiseptic. The aqueous ammonia solution and silver nitrate solution are dropped into the titanium sulfate solution simultaneously with continuous stirring. The final reaction pH is controlled by ammonia water. The titanium and silver are leaded to coprecipitate. The solution is filtered and washed after maturing. Afterwards the powder of nano silver-carrying titanium dioxide antiseptic is prepared by drying and calcining. The titanic acid or metatitanic can also be taken as precursor. The slurry containing 15-25% of recursor is added with silver nitrate solution with a concentration of 20-30gL<-1>, and the phosphoric acid, sulfuric acid or hydrochloric acid is added with a concentration of 10-15mgL<-1>. The solution is reacted, filtered and washed under the temperature of 50-60 DEG C. The solid object is dried, crushed, calcined and cooled, and the power of nano silver-carrying titanium dioxide antiseptic is obtained. The invention uses generating an indissoluble silver salt with a preparing technique of titanium dioxide to obtain the sustained-releasing of silver and color changing prevention. Furthermore the complex of the electron pair and the cavity is avoided. The photocatalysis antimicrobial effect of titanium dioxide is reinforced. The color, luster, granularity and dispersibility of the product can be well controlled.

The invention relates to a honeycomb flue gas denitrification catalyst and a preparation method thereof, belonging to the technical field of inorganic new materials. The honeycomb flue gas denitrification catalyst is mainly prepared by carrying out extrusion molding and sintering on the following raw materials in parts by weight: 68-92.8 parts of nano TiO2, 3-10 parts of nano SiO2, 2-10 parts of glass fiber, 0.1-0.5 part of extrusion aid, 0.1-0.2 part of carboxymethyl cellulose, 0.1-0.3 part of polyoxyethylene and 0.1-0.2 part of sesbania powder. The preparation method comprises the following steps: (1) weighing the nano TiO2 and nano SiO2 powder, adding the extrusion aid, adding water while stirring to obtain paste, and adding ammonia water to regulate the pH value to 7-11; (2) adding the rest of raw materials, evenly mixing, and extruding with an extruding machine to obtain a honeycomb blank; (3) drying the blank at 30-70 DEG C under the relative humidity of 20-100% for 7-15 days; and (4) calcining the dried blank at 250-300 DEG C for 8-15 hours, calcining at 380-420 DEG C for 5-10 hours, and calcining at 580-620 DEG C for 8-12 hours to obtain the finished product.

The invention discloses a preparation method and application of a polyaniline/titanium dioxide/graphene conductive composite membrane. The preparation method comprises the steps of: adding 3-60wt% of titanium dioxide, 0.05-5wt% of graphene and 0.6-10wt% of polyaniline into protonic acid solution, and adopting an in-situ polymerization method to obtain a polyaniline/titanium dioxide/graphene conductive composite; sequentially and evenly coating conductive resin and polyaniline/titanium dioxide/graphene coatings to matrixes such as polypropylene, glass slides, metal plates and the like, wherein each coating is 30-500mu m thick; and drying at 60-80 DEG C to obtain the needed product. According to the preparation method, the titanium dioxide is embedded in a conductive material to prepare the membrane, the defects that the nano TiO2 is not easy to recover and the quantum yield is low can be overcome, the separation efficiency of photoproduction electrons and cavities can be improved, the photoresponse range can be extended, and the photocatalytic efficiency can be improved.

The invention discloses a nano composite diatom ooze paint, which is prepared by mixing and stirring a diatom ooze powder material and water according to a mass ratio of 1:0.9 to obtain a diatom ooze material, wherein the diatom ooze material is used for scrapping a bottom layer; and adding a diatomite-loaded nano TiO2 material to the diatom ooze material, mixing and stirring, and then using for coating texture shaping construction, wherein 6 g of diatomite-loaded nano TiO2 material is added to each kg of the diatom ooze material, and the diatom ooze powder material is prepared by stirring 20-50% of selected diatomite, 20-35% of quartz sand, 10-40% of ash calcium powder, 0.1-0.8% of white carbon black, 5-15% of heavy calcium carbonate powder, 0.6-3% of redispersible rubber powder, 0.5-1% of cellulose ether and 1-3% of negative ion powder. In the invention, the diatomite-loaded nano TiO2 material is easy to disperse in powder, does not generate secondary agglomeration, can completely exert proper action, and has low cost.

The invention relates to a titanium-based multi-metal oxide catalyst for removing diesel engine NOx by NH3-SCR in a wide temperature window, belonging to the technical field of exhaust contaminant control on diesel engine tail gas. The catalyst uses nano TiO2 as a carrier, uses metal oxides V2O5, CeO2, MnO2 and Fe2O3 as main active components, and uses WO3 and MoO3 as catalyst promoter components, wherein the contents of the main active component in the catalyst respectively are as follows in percentage by weight: 48-84% of TiO2, 1-3% of V2O5, 5-15% of MnO2, 1-5% of CeO2, 1-5% of Fe2O3, 3-9% of WO3 and 5-15% of MoO3. The preparation process of the catalyst comprises the following steps: pre-activating the TiO2; and determining charge numbers of the metal oxide main active components and the catalyst promoters, and charging the metal oxide main active components and the catalyst promoters. By replacing high poisonous V oxides with Ce, Mn and Fe oxides, the invention reduces environmental hazard of the catalyst, greatly improves the low-temperature activation and the high-temperature selectivity, and effectively decreases NOx in the wide temperature window of 100-550 DEG C. The catalyst has high sulfur poisoning resistance and water poisoning resistance, and is suitable for high-sulfur diesel fuel and urban road conditions in China.

The invention provides a composite anti-microbial air filtration material. An electrets fabric layer, an electrostatic spinning fiber membrane layer, chitosan and nano TiO2 photocatalyst are combined, thus PM2.5 is effectively removed, and meanwhile, the filtration material has anti-microbial, disinfection and odor removal functions; further, the filtration material is applied to the filtering material fields of window cloths and screen window to replace natural air instead of diffusion air; meanwhile, the filtration material is applied to fields of air-conditioners, air purifiers and masks, thus comprehensive purification of indoor air and breathing air of people is realized. In addition, the invention further provides a preparation method and application of the composite anti-microbial air filtration material.

The invention relates to element-negative-ion-releasing sterilizing mite-preventing electromagnetic-wave-preventing fire-retarding nano-grade fabric used in vehicles. The invention belongs to the technical field of textile fiber fabric production of vehicle-use nano-grade decorative fabric with functions of refreshing and air-purifying. The fabric is a nano-grade functional healthy textile. The nano-grade fabric provided by the invention is produced form chitosan, which is a natural high polymer extracted from shells of shellfishes, crabs and shrimps; a natural antibiotic humectant SCJ-920; a high-efficiency mite-preventing antibacterial agent SCJ-998; nano-grade negative-ion powder SCJ-900; negative-ion far infrared healthcare slurry 700; a fire retarding finishing agent ATF; an aromatic finishing agent SCM; electromagnetic-wave-preventing ferrites Fe2O3, Fe3O4, and Fe; substances such as TiO2, Al2O3, and ZnO used for providing far infrared radiation; an Ag-embedded nano-TiO2 (AT) antibacterial agent; nano-grade selenium or organic selenium which is rare on earth; organic germanium, Chinese herbal medicines, essential oil, maifanite, tourmaline nano-grade powder and other materials. A mixture of the materials is added to cotton, linen, wool, silk, polyamide fiber, acrylic fiber, terylene or viscose fiber spinning liquid, and the nano-grade fabric is produced through weaving.

The invention belongs to the field of a solar cell, and discloses a perovskite solar cell. The perovskite solar cell sequentially comprises a transparent conductive substrate, an electron transmission layer, an interface modification layer, a modified perovskite active layer, a hole transmission layer and a positive electrode, wherein the electron transmission layer is a nanometer TiO2 particle layer, and the interface modification layer is a fullerene derivative layer. A sol-gel method is employed, high-crystallization TiO2 nanoparticles are synthesized by taking titanium tetrachloride is used as a precursor, the TiO2 nanoparticles are applied to the perovskite solar cell by employing a low-temperature annealing process, a fullerene derivative is directly spin-coated on a surface of the obtained nanometer TiO2 particle layer for modification, the defects in TiO2 and perovskite are passivated, a novel perovskite synthesis path is employed, the obtained perovskite solar cell has high efficiency and does not have hysteresis effect under a low-temperature preparation process, and the device can be used for stable transmission; and moreover, the related preparation method is simple, is low in energy consumption and is suitable for promotion and application.

The invention discloses a preparation and using method of multiple active porous mineral doped nano-TiO2 composite catalytic anti-bacterial materials, and the preparation and using method belongs to the technical field of new material. The main technical key point of the invention is to combine the anti-bacterial mechanism of the ion modified porous minerals and the photo-catalytic anti-bacterial mechanism of the element doped nano-TiO2 to realize the synergistic anti-bacterial role, the modification of the porous minerals by the metal anti-bacterial ion (one of Ag<+>, Cu<2+>, Zn<2+> and Fe<3+>) and the rare earth ion and the nano-TiO2 doped synchronous composite process technology by the metal anti-bacterial ion and the rare earth ion are realized during the preparation process, thereby obtaining the composite catalytic anti-bacterial composite materials which are characterized by broad-spectrum, long-acting effect and safety, etc. The composite catalytic anti-bacterial products prepared by adopting the method and the technical process have low cost, anti-bacterial and long-acting effects, broad-spectrum and good synergistic anti-bacterial effect, the preparation process of the materials has the advantages of simpleness and strong operationality, and the like, so the preparation and using method can be widely applied in anti-bacterial coating, putty, fabric and other industries.

The invention belongs to the technical field of inorganic materials and in particular relates to a kieselguhr-based environmentally-friendly glaze material for an inner wall brick and the inner wall brick prepared by using the same as well as a preparation method. The kieselguhr-based environmentally-friendly glaze material for the inner wall brick comprises kieselguhr, a nano TiO2/tourmaline composite material, a sintering adjuvant, ceramic pigment, a dispersing agent and water, wherein the weight ratio of kieselguhr to nano TiO2/tourmaline composite material to sintering adjuvant to ceramic pigment to dispersing agent to water is (40-92):(6-40):(2-15):(0-8):(0.1-4):(60-250). According to the invention, a functional raw material nano TiO2/tourmaline composite material is introduced in the environmentally-friendly glaze material for the inner wall brick, and the functional raw material has multiple functions of obviously dispelling poisonous and harmful gases such as formaldehyde, ammonia, benzene, volatile organic compound (VOC) and the like which are released by various decoration and finishing materials, furniture and the like, releasing negative ions, resisting bacterium and the like.

A nitrogen doped nano-TiO2 modified photocatalytic paint with low content of volatile VOC, and high ultraviolet shielding-absorbing and antibacterial effect is prepared from silicic acrylate emulsion, nitrogen doped nano-TiO2, ordinary nano-TiO2, titanium oxide powder, kaolin, heavy and light calcium carbonate, wallastonite powder, assistant, water, ammonia water, defoaming agent and antimildew agent through proportional mixing, stirring and filtering.

The invention relates to a graphene/TiO2-based near-infrared/ultraviolet radiation resistant polymer composite film and a preparation method thereof, relating to a near-infrared/ultraviolet radiation resistant composite film and a preparation method thereof. The invention aims to solve the problems of the existing heat reflecting material such as poor heat insulation effect, low transparency, serious light pollution and high production cost and the like. The composite film is prepared by adding the mixed liquid of graphene oxide dispersion and nano-TiO2 dispersion in the curing system of epoxy acrylate at a volume ratio of 1-10:50. The preparation method comprises the following steps: 1) preparing graphene oxide; 2) preparing TiO2 nanoparticles; 3) preparing nanometer graphene/TiO2 composite; and 4) preparing the graphene/TiO2-based near-infrared/ultraviolet radiation resistant polymer composite film. The composite film is mainly used for the glass coating of a building or means of transport for running an air-conditioning system.

The invention relates to a polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method, which comprises the following steps: adding nano TiO2 and SiO2 into a polyvinyl alcohol aqueous solution and stirring; carrying out ultrasonic mixing on a mixed liquor; placing the mixed solution in a reaction kettle after ultrasonic; heating, stirring and reacting at constant temperature; adding stearic acid-alcohol mixed solution and glutaraldehyde with the same temperature and stirring; and carrying out cross-linking reaction at a constant temperature; stirring and cooling to a room temperature after reaction, so as to prepare into a nano composite coating new material. With the adoption of the polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method, the nano TiO2 is adopted to modify a polyvinyl alcohol radical composite coating fresh keeping packaging material; the new material film formation moisture permeability is obviously reduced, and anti-bacteria fresh keeping performance of the packaging material is obviously improved.

The present invention belongs to the field of chemistry and chemical engineering. The loaded photocatalytic filtering net is prepared with foamed metal sheet as carrier and through preoxidation of the foamed metal sheet, soaking the preoxidized foramed metal sheet in sol with tetrabutyl titanate or titanium trichloride precursor, drying and sintering. Carried TiO2 as active component accounts for 3.0-9.8% of total photocatalytic filtering net weight. The foamed metal of the present invention has stable chemical performance and high air penetration; and the loaded photocatalytic filtering net has great carrying amout, great specific surface area, high combination performance and high photocatalytic activity. When cooperating with ultraviolet ligh source, the loaded photocatalytic filtering net may be used to eliminate organic pollutant effectively.

The invention relates to a nano particle taking Fe3O4 as core, in particular to a TiO2/SiO2/Fe3O4 nano particle with nuclear structure and manufacturing method thereof. The invention solves the technical problems that nano TiO2 particle catalyst has low catalytic efficiency under natural light and is difficult to meet recovery control while remaining high catalyst activity in sewage treatment. The method includes steps of preparing SiO2/Fe3O4 solution, preparing titanium sol and mixing the prepared SiO2/Fe3O4 solution and the titanium sol. The invention adopts ferromagnetic particle as a carrier core and prepared TiO2/SiO2/Fe3O4 particle with nuclear shell structure as catalyst, and the catalyst particle has good dispersity and water-solubility and can be fully contacted with organic pollutant in sewage, thereby not only having high efficiency of suspended phase photocatalyst but also realizing magnetic control of catalyst by super paramagnetic nuclear energy, thus being effectively recovered.

The invention discloses a hybrid super capacitor and a manufacture method thereof, belonging to novel energy storage elements and the technical field of manufacture thereof. A negative active material of the hybrid super capacitor is one or more of polymorphs TiO2-B of nano TiO2 or TiO2, and a positive active material thereof is one or more of carbon nano tube, carbon nano fiber, graphite, conductive carbon black, nickel hydroxide, manganese hydrate or molybdenum hydroxide. The hybrid super capacitor manufactures electrodes by adopting positive and negative active materials, a binder and a conductive agent as raw materials, and assemblies the electrodes into a simulative battery in a glove box so as to manufacture the hybrid super capacitor. The manufacture method provided by the invention has adjustability, simple manufacture process and easy operation, and the assembled hybrid super capacitor has the characteristics of high capacitance, low potential, stable performance, charge and discharge with large current, long cycle life, low cost, easy implementation for mechanized and large-scale production and the like.

The invention belongs to the fields of environmental protection and environment catalysis, and specifically relates to a novel mesoporous TiO2 carrier based SCR flue gas denitration catalyst and a preparation method thereof. According to the invention, the mesoporous TiO2 carrier based SCR flue gas denitration catalyst is obtained by using mesoporous TiO2 as a carrier, WO3 and CeO2 as auxiliary agents, and V2O5 as an active component. The compound catalyst comprises, by weight, 83.5-94.5% of TiO2, 0.5-1.5% of V2O5, 4-10% of WO3 and 1-5% of CeO2. The mesoporous TiO2 is employed as the carrier to substitute traditional nano TiO2, so as to substantially increase a specific surface area of the catalyst; and the interactions among V2O5, WO3 and CeO2 increase denitration activity of the catalyst. Besides, the catalyst shows excellent catalytic activity in a temperature range from 200 to 450 DEG C with ammonia as a reduction agent.

A magnetic composite nano-TiO2 photocatalyst able to be recovered magnetically is prepared by sol-gel method. It is composed of Fe3O4 as core, SiO2 as isolating layer and TiO2 as coated layer. It has excellent soft magnetic property, high photocatalyst activity, and high degradability to methyl orange.

The invention provides a nano photocatalysis porous concrete product and a preparation method thereof. The nano photocatalysis porous concrete product is prepared by the method comprising the following steps: curing press formed porous concrete for 1 to 7 days, then soaking the porous concrete in nano TiO2 dispersion liquid of which the mass concentration is between 2 and 10 percent for 1 to 5 minutes, and taking out the cured porous concrete to obtain the nano photocatalysis porous concrete product. The nano photocatalysis porous concrete product has the following main advantages: (1) compared with dense concrete, the nano photocatalysis porous concrete product has a larger contact area between the nano photocatalysis porous concrete product and polluted gas or liquid, has high photocatalysis efficiency, and can be applied to air purification treatment or water treatment; and (2) compared with P25, the nano photocatalysis porous concrete product adopts the P25 doped with nano titanium dioxide powder to have higher photocatalysis Nox degradation efficiency.

A composite nano-TiO2/zeolite photo-catalyst is prepared from zeolite as basic material and soluble Ti salt as precursor through immersing the zeolite molecular sieve with different skeletons in the solution containing Ti ions, drying by evaporating and calcination. It has the crystal phases of anatase and rutile, and controllable high catalytic activity.

The present invention relates to a low temperature treating process of self-cleaning TiO2 nanoglass. By using silica and anatase type nanosol as basic components and through pulling process, film is formed on the surface of glass plate. The film is dried at room temperature and cured or treated at temperature below 300 deg.c and cooled naturally. The prepared self-cleaned glass has excellent photocatalytic property, superhydrophilic property, high and homogeneous transparency. The said process is simple, low in cost and suitable for industrial production.