59results about How to "Single crystal phase" patented technology

The invention discloses a method for preparing lanthanum-doped bismuth titanate nano powder by a sol-gel hydrothermal method, which comprises the following steps of: dissolving Bi (NO3) 3.5H2O and La (NO3) 3.6H2O into glacial acetic acid solution to obtain solution A; dropwise adding Ti (OC4H9) 4 into organic solvent to obtain solution B; dropwise adding the solution B into the solution A, and preparing even sol by magnetic stirring; putting the sol into a drying oven, and drying to obtain xerogel; grinding to obtain powdered hydrothermal reaction precursor; putting the hydrothermal reaction precursor into a hydrothermal kettle, and adding pure water taken as solvent and NaOH taken as mineralizer into the hydrothermal kettle; sealing the reaction kettle, and putting the reaction kettle into the drying oven at 160-170 DEG C; taking out products after reaction, and filtering to obtain precipitate; and finally, washing and drying the precipitate to obtain the lanthanum-doped bismuth titanate nano powder. The method can be used for preparing the lanthanum-doped bismuth titanate nano powder under the condition of low temperature, so that the energy is saved, and lanthanum-doped bismuth titanate is perfect in crystallization.

The invention discloses a p-type CuxSy semiconductor nanocrystalline, a preparation method and an application thereof and belongs to the fields of nanometer material preparation and applications. X / y of the nanocrystalline CuxSy is 1.8, the nanocrystalline is spherical, and the particle size of the nanocrystalline is 6-12nm. The preparation method includes preparing a copper source, preparing a sulfur source, injecting the copper source to the sulfur source, subjecting the solution to heating reaction to obtain a colloidal solution and subjecting the colloidal solution to washing and centrifugal sedimentation to obtain the nanocrystalline. The nanocrystalline is single in crystalline phase, good in dispersibility, controllable in size and morphology, good in electrical conductivity, high in carrier mobility and good in high temperature resistance and stability, the nanocrystalline is high in absorption ability in the whole near infrared area, and the absorption peak is 1100-1500nm. The preparation method is high in productivity and applicable to large-scale production. When the nanocrystalline is applicable to hole transport layers of thin-film solar cells, transport abilities of the hole transport layers can be obviously improved.

The invention discloses a preparation method for copper and aluminium hydrotalcite. The preparation method comprises the following steps of: (1) weighing a copper source and aluminium chloride according to a 2:1 molar ratio of Cu:Al, wherein the copper source is copper oxide or copper hydroxide, dissolving the copper oxide or copper hydroxide and the aluminium chloride in deionized water to be prepared into a mixed liquor in a reaction vessel, heating and stirring the mixed liquor at the constant temperature of 30-40 DEG C till all the copper oxide or copper hydroxide is dissolved, i.e. the color of the solution becomes blue; (2) adjusting the pH value of the solution obtained in the step (1), leading the pH value of the solution not to be higher than 8, and continuously reacting for 2-4h at the temperature of 30-40 DEG C; (3) crystallizing the slurry reacted in the step (2) at the constant temperature of 30-40 DEG C; and (4) filtering, washing, drying and grinding reaction liquid crystallized in the step (3) to obtain the copper and aluminium hydrotalcite. The preparation method has the advantages that used raw materials are low in cost and easily obtained, the conversion rate of atoms is high, and the industrialization cost can be reduced.

The invention discloses a method for recycling lithium cobalt oxide from a waste positive electrode of a lithium cobalt oxide battery. The method comprises the following steps of: (1) feeding the waste positive electrode of the lithium cobalt oxide battery into a 1-2mol / L hydrochloric acid lixivium in which citric acid is dissolved, and reacting for 4-6 hours at 60-80 DEG C; (2) filtering the lixivium in the step (1) so as to separate aluminum foil and solid grains; and (3) washing and drying the solid grains; and (4) adding a lithium source into the solid grains to adjust the mass ratio of Co / Li in the solid grains, uniformly mixing, calcining and cooling so as to obtain lithium cobalt oxide. The method adopts the mixed acid of citric acid and hydrochloric acid as the lixivium so as to effectively separate a positive electrode material and the aluminum foil, the process is simple, and no toxic or harmful gases are generated. The first discharge capacity of recovered lithium cobalt oxide can still be 140mAh / g, and the discharge capacity after 40 times of charge and discharge circulation is not less than 90%.

The invention discloses Mn element and Zn element-doped super-paramagnetic ferrite nanoparticles and a preparation method thereof. Manganese element is added or manganese element and zinc element are simultaneously added into a face-centered cubic crystal structure of ferriferrous oxide nanoparticles by using a method of decomposing metal precursor compound at a high temperature; the magnetic performance of the prepared super-paramagnetic nanoparticles is improved by changing the doping amount and the distribution of the metal element; and primarily, the saturation magnetization is improved. The preparation method specifically comprises the following steps of: mixing acetylacetones of Fe and Mn as well as Zn with 1,2-hexadecanol; performing high-temperature decomposition in high-boiling-point solvent by taking oleic acid and oleylamine as surfactants; or performing high-temperature decomposition on composite oleate of Fe, Mn and Zn by taking the oleic acid as the surfactant; heating and preserving heat in stages in argon or nitrogen protective atmosphere to guarantee growth of nanoparticle nuclear; and cooling to room temperature after reaction is finished and settling and centrifuging to finally obtain the super-paramagnetic ferrite nanoparticles which are uniformly dispersed in normal hexane solution.

The invention relates to the technical field of hydrotalcite preparation, in particular to a method for preparing hydrotalcite by adopting brucite. In the method, brucite is adopted as a magnesium source, aluminum hydroxide is adopted as an aluminum source, and two main process steps of de-crystallization of brucite and aluminum hydroxide and recrystallization of de-crystallization substances areadopted. The method comprises the following steps: combining the brucite with the aluminum hydroxide according to the mole ratio of magnesium to aluminum being 2:4 to obtain mixture, mixing the mixture with zirconium oxide balls uniformly according to the ball-material ratio being 50:1, arranging the mixture and the zirconium oxide balls into a zirconium oxide ball milling tank for ball milling, then adding deionized water accounting for 10-20% of the total amount of brucite and aluminum hydroxide for ball milling continuously; mixing the material after ball milling and sodium carbonate solution according to the mole ratio being Mg2+:CO32-=1.5-6, stirring and crystallizing the mixture for 1-5h under water bath with the temperature being 60-80 DEG C, and the stirring rotation speed being 500r / min, and finally washing and drying to obtain the final product hydrotalcate.

the invention discloses a composite metal oxide film preparing method based on similar hydrotalcite as former, which is characterized by the following: adopting original synthetic technology to obtain the former of similar hydrotalcite on the AAO / Al; realizing the conversion from hydrotalcite film to composite metal oxide film with structural general formula as M12+zM22+1-x-zAl3+xO1+x / 2.

The invention relates to the technical fields of hydrotalcite compound preparation and surface modification, and concretely relates to a method for preparing a surface-modified hydrotalcite compound through adopting brucite. The method comprises the following processing processes: adding brucite, an aluminum source, an alkali source, a surface modifier and water according to a certain ratio, fully stirring, reacting in a hydrothermal reaction vessel at 100-250DEG C for 1-20h, washing, filtering, and drying to obtain the surface-modified hydrotalcite compound. The method which adopts cheap and easily available brucite as a raw material and allows the hydrotalcite synthesis and surface modification to be simultaneously carried out simplifies the production technology, saves the production time, substantially reduces the production cost, and provides possibility for the large-scale industrial production of the surface-modified hydrotalcite compound.

The invention provides a preparation method of highly pure pseudoboehmite. The method comprises the following steps: 1, alkoxylaluminum preparation; 2, filtering; 3, a hydrolysis reaction; 3, alcohol separation; 4, ageing and alcohol distillation; and 6, filtering, and drying for preparing the highly pure pseudoboehmite. The pseudoboehmite product prepared in the invention has the advantages of low impurity content, concentrated pore distribution and good stability. The preparation method has the advantages of environmental protection, no discharge of three wastes, and realization of recycling of the recovered alcohol and solvent after treatment, and the obtained product can be widely applied to catalytic reforming and catalytic hydrogenating carriers.

The invention discloses a preparation method for a bismuth ferrite BiFeO3 nanosheet. The preparation method comprises the following steps: weighing analytically pure Fe(NO3)3.9H2O and Bi(NO3)3.5H2O in a molar ratio of 1: 1 and dissolving the mixture in a ethylene glycol monomethyl ether solution to prepare a uniform solution A; dropwise adding an ammonia water solution into the solution A while stirring, wherein the mixture is fully settled, and uniformly stirring the mixture to prepare a reaction precursor; washing the prepared reaction precursor to neutral, and drying the reaction precursor to obtain dry powder; putting the dry powder and a NaOH solution into a reaction kettle, and sealing the reaction kettle; putting the reaction kettle in a reaction furnace at 120-150 DEG C, taking out a product in the reaction kettle after reaction, and washing and drying the product to obtain the bismuth ferrite BiFeO3 nanosheet. The preparation method disclosed by the invention is low in preparation temperature and energy-saving, and bismuth ferrite BiFeO3 is intact in crystallization and simple in instrument and equipment required by process control and synthesis.

The invention discloses a method for modifying and dyeing polyester fiber by use of silver-doped nano titanium dioxide disperse dye. The method comprises the following steps of: soaking the polyester fiber in a sodium hydroxide solution for etching; cleaning and drying the etched polyester fiber; preparing a modification and dyeing mixed solution; performing modification and dyeing composition finishing on the polyester fiber after the etching treatment in the first step by use of the modification and dyeing solution; and finally, cleaning and drying the modified polyester fiber. The method disclosed by the invention solves the problems that the polyester fiber prepared by an existing modification method has low photocatalytic activity under visible light, a poor self-cleaning function and non-lasting washing resistance and that the modified polyester fiber or fabric has poor handfeel and air permeability.

The invention discloses a production method of high-purity pseudo-boehmite. The production method comprises the following steps: a, weighing metal aluminum, subjecting the metal aluminum to smelting with a metal catalyst, and reacting the obtained alloy aluminum with water to prepare hydrogen, wherein the purity of the metal aluminum is not less than 99.9 wt%; b, separating slurry obtained after the reaction of the aluminum with water, drying the separated suspended slurry to obtain pseudo-boehmite, and optionally calcining the pseudo-boehmite to obtain aluminum oxide; c, treating aluminum-water reaction residues after slurry separation so as to recycle the aluminum-water reaction residues. The invention further discloses the obtained pseudo-boehmite. The method is simple in process and short in flow, and hydrogen preparation conditions are easy to realize; the catalysts gallium and indium in the alloy are low in consumption, so raw material cost is low, and recycling is easy to realize; and according to the invention, safety, environmental protection, low cost and high efficiency of hydrogen production can be realized, a high-added-value pseudo-boehmite product can be obtained, and remarkable economic benefits are obtained.

The invention discloses a method for preparing monocrystal bismuth titanate nanosheet, which comprises the following steps: 1)according to a chemical reaction of Bi4Ti3O12, metering and weighing Bi2O3 and TiO2, and placing in a ceramic mortar, adding carbohydrate, grinding for 8-10 minutes in the ceramic mortar to obtain a mixture; 2)heating the obtained mixture until the mixture begins to combust, and obtaining the powder after completely combustion; and 3)washing the obtained power in the step 2) by using dilute nitric acid, removing the unreacted bismuth oxide and titanium oxide, washing to neutrality by using deionized water, and placing in a baking oven for drying to obtain the products monocrystal bismuth titanate nanosheet. The preparation method has the advantages of low temperature, saved energy, simple step, short reaction time within 10 minutes for whole combustion reaction, high efficiency, high crystallization degree of the synthesized monocrystal bismuth titanate nanosheet, and easy control of synthesis, equipment required by synthesis is simple, and a high-energy bowl mill and a high temperature furnace are not required.

The invention discloses a method for preparing an alpha-nickel sulfide and carbon nanometer rodlike composite material in an in-situ mode. The method is mainly characterized in that the method that nanometer rodlike carbon wraps nickel in an in-situ backflow vulcanizing mode is adopted to prepare the alpha-nickel sulfide and carbon nanometer rodlike composite material, and controllable adjusting on the nickel sulfide crystalline phase is achieved through the nanometer limited range action of a carbon nanometer rod . Compared with the existing synthetic technology, according to the alpha-nickel sulfide and carbon nanometer rodlike composite material synthesized through the method, the crystalline phase of the alpha-nickel sulfide is single, the alpha-nickel sulfide is distributed evenly in the carbon nanometer rod, the synthesis process is simple, repeatability is good, and a supercapacitor electrode made of the nanometer composite material has a large specific capacitance value and good circulation stability.

The invention discloses a preparation method and application of a hydrotalcite-based NiMnTi catalyst. The preparation method adopts nickel nitrate hexahydrate, a butyl titanate solution and a manganese nitrate solution with a mass fraction of 50% as raw materials and urea as a precipitant, synergistically exerts the advantages of Ni, Mn and Ti as the cut-in point and utilizes the preparation of NiMnTi-like hydrotalcite to effectively assemble Ni, Mn and Ti in situ. The preparation method comprises: dissolving the raw materials and a precipitant in distilled water, adding ethanol into the solution to obtain a mixed solution, carrying out reflux condensation on the mixed solution in an oil bath, carrying out cooling, suction filtration, washing, drying and grinding to obtain a NiMnTi-like hydrotalcite precursor, and calcining the NiMnTi-like hydrotalcite precursor to obtain the NiMnTi composite oxide catalyst. The NiMnTi composite oxide catalyst has good catalytic activity in the NH3-SCRreaction (with an NOx removal rate of 90% or more at 150-360 DEG C), high N2 selectivity and excellent water and sulfur resistance.

The invention relates to a nickel metaphosphate micro-nanomaterial as well as a preparation method and an application thereof. The micro-nanomaterial has a nano sheet array structure, and the lamellar thickness of nano sheets is less than 20nm. The nickel metaphosphate micro-nanomaterial is prepared through the preparation method comprising the following steps: dissolving a soluble nickel salt and weak base molecules in a solvent to react together with carbon cloth to obtain a nickel-containing precursor / carbon cloth complex, and then performing heat treatment on the nickel-containing precursor / carbon cloth complex and a phosphate compound in an inert atmosphere to obtain the nickel metaphosphate micro-nanomaterial. Based on a structure duplication thought, the invention adopts a two-step method to achieve preparation of a micro-nanostructure and growth of a nickel metaphosphate crystal phase, respectively, the preparation of the nickel metaphosphate micro-nanomaterial with a single crystal phase is achieved, the experiment operation is simple and safe, and scale production and application can be achieved. The prepared nickel metaphosphate micro-nanomaterial has a significant pseudocapacitance characteristic, and the specific capacitance is greater than 2000F / g when the discharge current is 1A / g, so that the nickel metaphosphate micro-nanomaterial has a good potential application prospect in the aspect of electrochemical energy storage.

The invention provides a pulse energy storage dielectric ceramic material and a preparation method thereof. The invention belongs to the field of electronic component materials. The material consistsof a main crystal phase that is Sr<0.7+x>Ca<y>Bi0.2TiO3 (0.01<=x<=0.05, 0.05<=y<=0.15) and a modification additive, wherein the modification additive is one or more of CeO2, Nb2O5, Nd2O3, ZnO, MnCO3 and SiO2. The preparation method comprises the following steps: burdening, ball-milling, granulating, forming and sintering. The pulse energy storage dielectric ceramic material has relatively high dielectric strength (350-450kV / cm), relatively high energy storage density (2.1 J / cm<3> at 290kV / cm), relatively high energy storage efficiency (97-99%) and stable performance, and the loss is as low as0.002. The pulse energy storage dielectric ceramic material is suitable for use as a pulse capacitor dielectric material. The preparation method has the characteristics of being simple, easy to control, environment-friendly and low in cost.

The invention provides a method for preparing a chalcopyrite solar cell light absorption layer with further enhanced uniformity and a solar cell thereof to solve a technical problem in the prior art that the prepared light absorption layer has not good enough uniformity. The method for preparing chalcopyrite solar cell light absorption layer comprises the following steps of: S1, preparing a metal preset layer; S2, forming a selenium layer or a sulfur layer or a selenium sulfur layer on the surface of the metal preset layer; S3, forming a metal preset layer on the selenium layer or the sulfur layer or the selenium sulfur layer in the step S2 to form an A / B / A sandwich -shaped intermediate product; and S4, carrying out selenylation and / or sulfurization treatment on the intermediate product. By utilizing the A / B / A sandwich-shaped structure, a layer of Se or S or a SeS layer is arranged between two metal preset layers; therefore, the internal reaction can be more sufficient in the selenylation and / or sulfurization process; the uniformity is further enhanced; the crystallization is better; and a single crystalline phase is achieved.

The invention discloses a method for preparing high-visible light activity nitrogen doped N-TiO2. The method comprises the following steps: mixing mixed solutions of isopropanol and acetylacetone, adding nitric acid, and stirring so as to obtain a solution A; under a stirring condition, dropping butyl titanate into the solution A, further continuously stirring uniformly so as to obtain a reactionprecursor; transferring the reaction precursor into a reaction kettle, adding absolute ethyl alcohol, and sealing the reaction kettle; controlling the temperature inside the reaction kettle to 140-200DEG C, and performing a reaction for 14-20 hours; cooling to the room temperature, washing a product to be neutral, and drying, thereby obtaining the nitrogen doped N-TiO2. The method disclosed by the invention is simple and easy to operate, the energy can be saved, and a sample has high visible light activity.

The invention provides a method for preparing pseudo-boehmite and alumina from higher fatty alcohol. The method comprises the following preparation steps: (1) preparing aluminum alkoxide; (2) carrying out filtering; (3) carrying out a hydrolysis reaction; (4) separating alcohol; (5) carrying out aging and distilling the alcohol; (6) carrying out spray drying so as to obtain high-purity pseudo-boehmite; and (7) carrying out calcining and crushing so as to obtain alumina. The method provided by the invention overcomes the disadvantages of difficult purification, uneasy recycling and utilization of lower alcohol and safety problem in preparation of aluminum alkoxide from the lower alcohol. The preparation process is environment-friendly and does not discharge three wastes; recovered alcohol and solvents can be recycled after treated; and obtained products can be extensively applied to carriers of catalytic reforming and catalytic hydrogenation.

The invention discloses a preparation method of ferric pyrophosphate and application of the ferric pyrophosphate in sodium-ion batteries. The preparation method of the ferric pyrophosphate comprises two steps that FeH2P2O7 is firstly prepared through a liquid phase method and is evenly mixed with a sodium source, and then calcination is performed to obtain the ferric pyrophosphate. The method is simple in process, facilitates large-scale production, the prepared ferric pyrophosphate is uniform in particle size distribution, low in impurity content and superior in electrochemical performance and can serve as an anode material for preparing high-performance sodium-ion batteries.

The invention relates to a silica and zinc oxide anti-reflection film for dye-sensitized solar cells and a preparation method thereof. SiO2 with a refractive index of 1.3 is placed on the glass surface of the conductive glass FTO, and ZnO with a refractive index of 1.9 is placed on the conductive surface of the conductive glass FTO, which forms a gradient change with the refractive index of the conductive glass to improve the transmission of the conductive glass, thereby finally improving the efficiency of dye-sensitized solar cells. The anti-reflection film obtained by the invention can not only improve the transmittance of the conductive glass, but also enhance the electron transport efficiency, and is used for the quasi-solid-state dye-sensitized solar cell, and the photoelectric conversion efficiency of the cell can be increased from 4.71% to 5.63. %.

The invention discloses a negative temperature coefficient thermomagnetic composite sensitive resistance material and a preparation method thereof, and belongs to the field of electronic component materials. The resistance material of the invention comprises the following components in weight percentages, calculated by oxides: 73-78% of Mn3(subscript)O4(subscript), 10.5-13% of Co2(subscript)O3(subscript), 11.5-14% of NiO and 0-0.5% CuO. A formula of the invention does not contain Fe, ensuring high homogeneity under the condition of high temperature sintering; and the sintering temperature is as low as only 1140 DEG C, showing a certain energy-saving advantage; and the raw materials are abundant in China and appropriate in price, without higher cost constraints for the large-scale production of the resistance material.

The invention discloses a Y type molecular sieve prepared from white clay served as a raw material and a preparation method thereof. The preparation method comprises the following steps: 1) adding analkali solid into white clay, uniformly mixing and calcining, thereby acquiring an alkali fusion clinker; 2) cooling the alkali fusion clinker to room temperature, and then adding water and guiding agent for regulating till the whole system has a material molar ratio of (13.9-16.1)Na2O:Al2O3:(9.5-10.5)SiO2:(600-800)H2O, and then uniformly stirring, thereby acquiring a silica-alumina gel; 3) ageingand crystallizing the silica-alumina gel, and then filtering, cleaning and drying, thereby acquiring the Y type molecular sieve. The method provided by the invention has the advantages of low production cost, simple process, high repeatability and convenience in industrial production.

The invention relates to a low-temperature green synthesis method for preparing analcime from red soil, and belongs to the technical field of chemical preparation of environmental ecological materials. The preparation method of the zeolite material comprises the following steps: by taking red soil as a reaction raw material, directly preparing a high-crystallinity single-crystalline-phase analcimeproduct by adopting a hydrothermal method. By using southern natural soil as the raw material, the cost is low; the technological process is simple and easy to industrialize; the synthesis steps do not involve a high-temperature process, and the process path is energy-saving and environment-friendly; the prepared zeolite product has a single analcime crystal phase, and the grain size is about 80-90 microns.

The invention relates to the technical field of preparation of hydrotalcite-like compounds, and discloses a pure cobalt hydrotalcite-like compound and a preparation method thereof. A constant pH precipitation method is adopted, cobalt nitrate serves as a cobalt source, a mixed solution of methyl alcohol and water (the volume ratio is 1: 1-8: 1) serves as a solvent, the cobalt nitrate solution is slowly dropwise added into a sodium carbonate solution at the room temperature, the pH of the solution is adjusted to be 8-12, and the pure cobalt hydrotalcite is obtained through the steps of hydrothermal aging, suction filtration, washing, drying and the like. The hydrotalcite-like compound is single in crystalline phase, regular in structure and good in layered structure and flaky morphology, the average thickness of nanosheets ranges from 5.9 nm to 12.8 nm, and the high crystallinity degree is achieved. The preparation process is simple and easy to operate, the raw materials are cheap and easy to obtain, the preparation conditions are mild, the period is short, the purity and the yield of the hydrotalcite-like compound are high, and quantitative synthesis can be realized.

The invention relates to a nickel metaphosphate micro-nanomaterial as well as a preparation method and an application thereof. The micro-nanomaterial has a nano sheet array structure, and the lamellar thickness of nano sheets is less than 20nm. The nickel metaphosphate micro-nanomaterial is prepared through the preparation method comprising the following steps: dissolving a soluble nickel salt and weak base molecules in a solvent to react together with carbon cloth to obtain a nickel-containing precursor / carbon cloth complex, and then performing heat treatment on the nickel-containing precursor / carbon cloth complex and a phosphate compound in an inert atmosphere to obtain the nickel metaphosphate micro-nanomaterial. Based on a structure duplication thought, the invention adopts a two-step method to achieve preparation of a micro-nanostructure and growth of a nickel metaphosphate crystal phase, respectively, the preparation of the nickel metaphosphate micro-nanomaterial with a single crystal phase is achieved, the experiment operation is simple and safe, and scale production and application can be achieved. The prepared nickel metaphosphate micro-nanomaterial has a significant pseudocapacitance characteristic, and the specific capacitance is greater than 2000F / g when the discharge current is 1A / g, so that the nickel metaphosphate micro-nanomaterial has a good potential application prospect in the aspect of electrochemical energy storage.

The invention provides a preparation method of highly pure pseudoboehmite. The method comprises the following steps: 1, alkoxylaluminum preparation; 2, filtering; 3, a hydrolysis reaction; 3, alcohol separation; 4, ageing and alcohol distillation; and 6, filtering, and drying for preparing the highly pure pseudoboehmite. The pseudoboehmite product prepared in the invention has the advantages of low impurity content, concentrated pore distribution and good stability. The preparation method has the advantages of environmental protection, no discharge of three wastes, and realization of recycling of the recovered alcohol and solvent after treatment, and the obtained product can be widely applied to catalytic reforming and catalytic hydrogenating carriers.

The invention discloses a method for modifying and dyeing polyester fiber by use of silver-doped nano titanium dioxide disperse dye. The method comprises the following steps of: soaking the polyester fiber in a sodium hydroxide solution for etching; cleaning and drying the etched polyester fiber; preparing a modification and dyeing mixed solution; performing modification and dyeing composition finishing on the polyester fiber after the etching treatment in the first step by use of the modification and dyeing solution; and finally, cleaning and drying the modified polyester fiber. The method disclosed by the invention solves the problems that the polyester fiber prepared by an existing modification method has low photocatalytic activity under visible light, a poor self-cleaning function and non-lasting washing resistance and that the modified polyester fiber or fabric has poor handfeel and air permeability.