47 results about "Trioctylphosphine oxide" patented technology

The invention belongs to the method for compounding cadmium selenide and quanta of cadmium telluride, which is: use cadmium oxide containing 2~18 carbon atom as cadmium source, selenium powder as selenium source and tellurium powder as tellurium source, and the mol ratio of cadmiumsource and selenium source or tellurium source is 5:1-1:5, dissolve the selenium and tellurium powder with tricapryl phosphine, make oleic acid, and tricapryl phosphine oxide as enveloping agent and the mol ratio of cadmium source and enveloping agent is 1:2-1:6, use benzene, toluene, cyclohexane, normal hexane and normal heptane as solvent, under the condition that the density of cadmium source is 0.001-0.015M, the temperature in autoclave is 140-180deg.C, heat them for 0.8-16 hours and obtain cadmium selenide and quanta of cadmium telluride with different sizes by changing the reaction time. The cadmium selenide and quanta of cadmium telluride has narrower size distribution which is shown as narrower shooting of fluorescence whose half-peak width of quanta of cadmium selenide is 22-33nm and that of quanta of cadmium telluride is 29-35nm.

In the method, two phases system is formed under following condition: cadmium alkyl carboxylic acid containing 2-18 carbon or cadmium oxide as cadmium source; thiourea or thioacetamide as sulphur source; oleic acid or three octyl phosphine oxide (TOPO) as package agent; water in equivolume and organic compound not dissolved in water as solvent; heating 0.5-24 hours inside autoclave under 120-180 deg.C. Quantum points of cadmium sulphide in different sizes are obtained by changing reaction time. Or, quantum point near to size distribution of crystal seed in larger size is obtained by using obtained quantum point as crystal seed through reaction with new added reactive precursor. The invention realizes controllable size of quantum point, obtains quantum points in narrow distributed sizes. Light in royal purple or blue color is radiated under ultraviolet lamp. quantum efficiency is 3-60%.

The invention discloses an InP quantum point preparing method, comprising the steps of: (1) mixing InCl3 with trioctylphosphine oxide, and preserving heat at 90-110DEG C to prepare a solution whose In content is 0.1-0.3mol / L; (2) raising temperature to 130-180DEG C, and charging argon gas; (3) injecting P(Si(CH3)3)3 into InCl3-TOPO compound in the molar ratio of 1 to 1-1 to 2; (4) when the solution color turns into transparent red or orange, raising temperature to 260-270DEG C and preserving heat; (5) lowering temperature to 90-110DEG C and injecting dodecyl amine, decyl amine or mercaptan; (6) dissolving reacting mixture in nonpolar solvent to form transparent colloidal solution, then adding in polar solution until the colloidal solution is muddy, and centrifugally separating and obtaining deposits and supernatant; and (7) centrifugally separating the supernatant, where the above steps (1)-(5) are performed. And it has characters of high crystallizability, uniform size, and good optical properties.

The invention relates to a preparing method of cube platinum ruthenium core-shell nanocrystalline. The preparing method comprises the following steps that firstly, ruthenium(III)2,4-pentanedionate, a platinum-containing compound and trioctylphosphine oxide are dissolved in a mixed solution of oleylamine and N,N-dimethylformamide, wherein the platinum-containing compound is chloroplatinic acid or sodium chloroplatinate; secondly, the mixed solution obtained in the first step is stirred to be subjected to the reaction for 30-600 min at the temperature of 180-250 DEG C; and thirdly, a product obtained in the second step is separated, and then sediment, namely the cube platinum ruthenium core-shell nanocrystalline is obtained. The invention further relates to the cube platinum ruthenium core-shell nanocrystalline prepared through the method. According to the preparing method, the cube platinum ruthenium core-shell nanocrystalline uniform in appearance and size is obtained through a one-step method, the obtained product is moderate in size and good in dispersibility, and the preparing method is simple.

The invention discloses a method for preparing a quantum dot of a transitional metal chalcogenide compound and belongs to the field of preparing functional nanomaterials by colloidal chemical methods. The method disclosed by the invention comprises the following steps: mixing a metal carbonyl compound and trioctylphosphine oxide, heating and dissolving the mixture as a metal source precusor, by taking octadecene as a reaction solvent, heating the mixture under inert gas protection to reaction temperature, and preparing a metal source reaction system; by taking organic phosphorus as a coorinating solvent, preparing non-metal source sulfur powder, selenium powder or tellurium powder into a precusor solution; injecting the non-metal source solution into the metal source reaction system under inert gas protection and maintaining the reaction temperature and carrying out a heating reaction; and carrying out high speed centrifugal separation, and adding a mixed solution of n-butylamine / n-hexane into the obtained solid product to obtain a quantum dot material of the transitional metal chalcogenide compound in a collide dispersing state. The preparation method for the quantum dot material of the transitional metal chalcogenide compound disclosed by the invention is good in universality, fast in reaction speed, high in reaction yield, simple to operate, mild in reaction condition and easy for large-scaled production.

The present invention discloses a bionical rare earth organic complex light conversion agent and a preparation method thereof, and the composition of the bionical rare earth organic complex light conversion agent is as follows: SmM<1-x>(TTA)L. The light conversion agent chooses the easily obtained, cheap samarium ion as a central ion, lanthanum La<3 plus>, gadolinium Gd<3 plus> and yttrium Y<3 plus> as heterocaryotic central ions, organic compound (Alpha-thenoyltrifluoroaceton) with the lowest excited triplet level matching the Sm<3 plus> excited level as a ligand and o-phenanthroline, 2,2'-bipyridyl, trioctylphosphine oxide, triphenylphosphine oxide, etc. as second ligands. The method for preparing the light conversion agent includes the following steps: dissolution, stirring and reaction, deposition, filtration, washing, drying, grinding and finished product, and the appearance of the product is white or light yellow. The light conversion agent provided by the present invention can convert ultraviolet light into red light with a wavelength between 620nm and 660nm, the emitting efficiency is high, the color purity is high, and the strongest emission wavelength is close to the position of the maximum absorption peak of chlorophylls (a, b), so the light conversion agent can meet the physiological requirement of the photosynthesis of plants.

A method for producing highly monodisperse nanocrystals comprising the steps of: a) preparing a precursor comprising a metal ion and a coordinating ligand; b) dissolving the precursor in a solvent mixture comprising coordinating solvent and optionally non-coordinating solvent; c) raising the temperature of the step b mixture into the range from 150° C. to 350° C.; d) adding a chalcogen to the step c heated mixture whereby the chalcogen reacts with the precursor; e) lowering the temperature of the step d mixture to stop the reaction; and e) maintaining the step e cooled mixture for sufficient time at sufficient temperature to narrow the size distribution of the nanocrystals. The methods greatly reduce or eliminate the need for trioctylphosphine oxide (TOPO); provide control over particle size, and permits facile production of high quality nanocrystals with very small diameters (<4 nm). CdSe nanocrystals produced via the methods are shown in the Figure.

The invention provides a preparation method of calcium magnesium acetate and a device thereof. The preparation method comprises extracting pyroligneous liquor with an organic solvent, and stripping the pyroligneous liquor with dolomite or limestone or calcium magnesium hydroxide to prepare the calcium magnesium acetate, wherein, acetic acid in the pyroligneous liquor and the dolomite or the limestone or the calcium magnesium hydroxide are taken as raw materials. The method comprises the following steps: extraction step S1: taking trioctylamine, trioctylphosphine oxide and n-butyl alcohol as extractants, selecting poly-aluminium sulfate as a demulsifier, and firstly extracting the acetic acid in the pyroligneous liquor; back extraction step S2: taking the dolomite or the limestone as a back extractant, performing back extraction on the extracted acetic acid, and allowing the back-extractant to react with the back-extracted acetic acid to generate the calcium magnesium acetate; and filtering and drying step S3: implementing processes such as filtration, concentration, drying and the like on the obtained calcium magnesium acetate to prepare granular calcium magnesium acetate. The invention develops a method for preparing the calcium magnesium acetate with low cost, and provides a new way for high-value utilization of the pyroligneous liquor.

Method for the preparation of inorganic-NP-composite microgels is based on the reversible transfer of microgels between water and an organic solvent such as tetrahydrofuran (THF). The method is used to produce semiconductor nanocrystals, often referred to as quantum dots (QDs) which are well known for their unique optical, electrical, magnetic and catalytic properties, as the inorganic NPs, recognizing that the best quality QDs are synthesized by a high temperature process in organic media, and have their surface covered with hydrophobic ligands (such as trioctylphosphine oxide, TOPO) that render the NPs insoluble in an aqueous solution.

The invention discloses a wurtzite manganese selenide nanosheet material and a preparation method of the wurtzite manganese selenide nanosheet material. The wurtzite manganese selenide nanosheet material is characterized in that the wurtzite manganese selenide nanosheet material is prepared by reaction of divalent manganous salt, selenium, trioctylphosphine oxide and ligand; the crystal structure is ligand wurtzite structure and the shape is a square slice; the wurtzite manganese selenide nanosheet has adjustable dimension. The wurtzite manganese selenide nanosheet prepared by the invention is adjustable in dimension, good in dispersing property, high in phase purity, good in crystallinity, and uniform in grain diameter distribution; the preparation method is simple in operation, short in reaction time, high in repeatability, and others; the invention has a certain application potential in photocatalysis, solar cell, rare magnetic material and other fields.

The invention discloses a polyethylene glycol-modified ferrous sulfide magnetic nanometer treatment agent as well as a preparation method and application thereof, wherein the polyethylene glycol-modified ferrous sulfide magnetic nanometer treatment agent has a laminar structure, and sequentially comprises a ferrous sulfide layer, a trioctylphosphine oxide layer, an octylamine-polyacrylic acid layer, a poly allyamine hydrochloride layer and a polyacrylic acid layer from inside to outside; hexa-amino branched polyethylene glycol is modified on the polyacrylic acid layer. The treatment agent disclosed by the invention can have high enrichment amount at the tumor part by retention and osmosis action of the tumor, and then photothermal therapy is carried out, so that the effect is significant, the other parts are not damaged, and the tumor does not reappear after being cured. Compared with the prior art, the polyethylene glycol-modified ferrous sulfide magnetic nanometer treatment agent is significant in effect. In addition, the cancer can be subjected to early diagnosis by magnetic resonance imaging, meanwhile, real-time monitoring can be carried out in recovered magnetic resonance arthrography, a reasonable treatment plant can be provided by combining with a real-time monitoring result, and the polyethylene glycol-modified ferrous sulfide magnetic nanometer treatment agent can be widely applied to a clinical diagnosis and treatment technology.

The invention discloses a method capable of improving acid resistance during reverse extraction of an extraction agent containing pyridine carboxylic ester and dinonylnaphthalene sulfonic acid and an application of the method. The application method is characterized in that the acid resistance during reverse extraction of the extraction agent can be obviously improved after trioctylphousphine oxide is added into the extraction agent containing pyridine carboxylic ester and dinonylnaphthalene sulfonic acid; moreover, nickel content in reverse extraction liquor can meet industrial needs of nickel electrolyte, the effect of simultaneously extracting Ni and Co from a multi-metal acid solution containing Fe, Ca, Mg, Co and Ni is not affected, and the removal effect on iron-calcium-magnesium impurities is not affected.

The invention provides a cleaning method and a preparation method of quantum dots, and belongs to the technical field of quantum dots. The cleaning method of the quantum dots comprises the steps that: the quantum dots are dispersed in a first non-coordination solvent, a first coordination solvent is added, and stirring reaction is conducted for 20-40 min at the temperature of 80-120 DEG C; and ligands of the quantum dots are tri-n-octylphosphine oxide and / or octadecyl orthophosphate. The mole number of the first coordination solvent is 2-3 times of the mole number of cations of the quantum dots. The first coordination solvent is oleic acid and / or zinc oleate. For the quantum dots with tri-n-octylphosphine oxide and / or octadecyl orthophosphate as ligands, according to the cleaning method of the quantum dots, oleic acid and / or zinc oleate are / is adopted for exchanging the ligands on the surfaces of the quantum dots, the ligands on the surfaces of the quantum dots are changed into oleic acid and / or zinc oleate, and in the subsequent cleaning process, the cleaning yield of the quantum dots can be increased.

The invention belongs to the method for compounding cadmium selenide and quanta of cadmium telluride, which is: use cadmium oxide containing 2~18 carbon atom as cadmium source, selenium powder as selenium source and tellurium powder as tellurium source, and the mol ratio of cadmiumsource and selenium source or tellurium source is 5:1-1:5, dissolve the selenium and tellurium powder with tricapryl phosphine, make oleic acid, and tricapryl phosphine oxide as enveloping agent and the mol ratio of cadmium source and enveloping agent is 1:2-1:6, use benzene, toluene, cyclohexane, normal hexane and normal heptane as solvent, under the condition that the density of cadmium source is 0.001-0.015M, the temperature in autoclave is 140-180deg.C, heat them for 0.8-16 hours and obtain cadmium selenide and quanta of cadmium telluride with different sizes by changing the reaction time. The cadmium selenide and quanta of cadmium telluride has narrower size distribution which is shown as narrower shooting of fluorescence whose half-peak width of quanta of cadmium selenide is 22-33nm and that of quanta of cadmium telluride is 29-35nm.

The invention relates to the field of chemistry and especially relates to a method for synthesis of metal telluride nanotubes. The method comprises the following steps of A, in a nitrogen environment, heating a mixture of oleic acid and oleylamine, B, keeping a temperature after heating, pouring a trioctylphosphine oxide extraction predecessor of tellurium into the mixture in first set time, and carrying out a chemical reaction process in second set time to obtain tellurium nano-wires, C, cooling the solution containing the tellurium nano-wires, and pouring phenylhydrazine and a trioctylphosphine oxide extraction predecessor of bismuth or lead into the solution to obtain a metal telluride, D, after the temperature obtained in the step C is stable, carrying out a metal alloying reaction process in third set time to produce a third primary product, E, repeatedly cleaning the third primary product according to an analogue intermiscibility theory to remove the organic solvent in the third primary product and to obtain a fourth primary product, and F, repeatedly cleaning the fourth primary product by a complexing agent to remove unreacted tellurium in the fourth primary product and to obtain the metal telluride nanotubes. The method greatly improves purity and a yield of the metal telluride product.

The invention relates to a composite extractant used in a metal indium extraction process. The composite extractant is formed by mixing Bis(2-ethylhexyl)phosphate (P204), trioctylphosphine oxide and hexylphosphine oxide mixture liquid (C923) and trialkyphosphine oxides (TRPO) according to certain proportion. After being diluted with sulfonated kerosene, the composite extractant is used as an extractant used for metal indium extraction. The composite extractant has good chemical stability, good selectivity and high indium extraction efficiency which can achieve more than 90%, simultaneously can reduce the extractant emulsification, is easy for re-extraction, and the demand to extraction conditions of a system is not high.

In the method, two phases system is formed under following condition: cadmium alkyl carboxylic acid containing 2-18 carbon or cadmium oxide as cadmium source; thiourea or thioacetamide as sulphur source; oleic acid or three octyl phosphine oxide (TOPO) as package agent; water in equivolume and organic compound not dissolved in water as solvent; heating 0.5-24 hours inside autoclave under 120-180 deg.C. Quantum points of cadmium sulphide in different sizes are obtained by changing reaction time. Or, quantum point near to size distribution of crystal seed in larger size is obtained by using obtained quantum point as crystal seed through reaction with new added reactive precursor. The invention realizes controllable size of quantum point, obtains quantum points in narrow distributed sizes. Light in royal purple or blue color is radiated under ultraviolet lamp. quantum efficiency is 3-60%.

The invention discloses an o-aminobenzene and m-aminobenzene wastewater treatment agent, which comprises the following components in percentage by weight: 10-50% of a complexing agent extraction compound and 50-90% of a complexing extraction agent diluent, wherein the complexing agent extraction compound is one or a plurality of materials selected from diisooctyl phosphate, 2-ethylhexyl phosphoricacid 2-ethylhexyl ester, tributyl phosphate (TBP), trioctyl phosphate, trioctylphosphine oxide, di(2-ethylhexyl phosphoric acid), di(2-ethylhexyl phosphoric acid) mono(2-ethylhexyl ester) and trioctyl / decyl tertiary amine, and the complexing extraction agent diluent is one or a plurality of materials selected from kerosene, sulfonated kerosene, n-hexane and dodecanol random polyether. The o-aminobenzene and m-aminobenzene wastewater treatment agent provided by the invention is good in treatment effect, high in efficiency and free of secondary pollution. The o-aminobenzene and m-aminobenzene wastewater treatment method provided by the invention is simple to operate, and can rapidly remove pollutants, and the treated wastewater meets the nanotube requirement.

The invention discloses a four-footed quantum dot, a light-emitting diode based on the four-footed quantum dot and a preparation method thereof. The preparation method includes the steps that a cadmium precursor mixed solution is prepared: cadmium oxide, oleic acid, n-propyl phosphonic acid and trioctylphosphine are mixed, then heating and degassing are performed under vacuum, heating is performed to reach the temperature of 280-330 DEG C till a clear and transparent solution is obtained; a sulfur precursor mixed solution is prepared: sulfur powder and trioctylphosphine are mixed and stirred under the inert atmosphere; the CdSe / CdS four-footed quantum dot is prepared: sphalerite CdSe quantum dots are injected into the prepared cadmium precursor mixed solution, the temperature rises to reach the temperature of 310-350 DEG C, the prepared sulfur precursor mixed solution is injected, and the heating is stopped; n-hexane is injected when cooling is performed to reach the temperature of 95-105 DEG C, and product purification is performed. The four-footed quantum dot is used as the material for a luminescent layer to prepare the light-emitting diode, and accordingly the efficient light-emitting diode high in light-emitting purity and long in service life is manufactured.

The invention provides a fuel cell anode catalyst and a preparation method and application thereof. According to the preparation method, transition metal is used as a metal source, trioctylphosphine oxide is used as a reaction solvent, a reaction product is prepared through a colloid synthesis method, and then the reaction product and a carbon carrier are subjected to a load reaction to obtain theload type transition metal phosphide anode catalyst. The anode catalyst has high-alkalinity HOR activity and high stability, is relatively low in preparation cost, is suitable for commercial mass production, and has a huge application prospect in the field of fuel cells. Specifically, ruthenium acetylacetonate is used as a ruthenium source, trioctylphosphine oxide is used as a reaction solvent, and tri-n-octylphosphine is used as a phosphorus source. The anode catalyst Ru2P / C is prepared according to the preparation method. When the loading capacity of the anode catalyst Ru2P / C is 0.4mgcm<-2>, the peak power of 1.3Wcm<-2> (the current density is 3.0Acm<-2>) can be achieved under the conditions of 80 DEG C and the back pressure of 0.1Mpa. The mass ratio exchange current density (j<0, m>) of the anode catalyst Ru2P / C is 0.27mAmug<-1>, the area ratio exchange current density (j<0, s>) of the anode catalyst Ru2P / C is 0.37mAcm<-2>, and the mass ratio exchange current density and the area ratio exchange current density of the anode catalyst Ru2P / C respectively reach three times of those of the Ru / C.

In a process for recovering acetic acid from a wood extract, an aqueous wood extract is provided that contains acetic acid and dissolved hemicellulose containing uronic acid. A water insoluble solvent containing an extractant for the acetic acid is also provided. In a preferred embodiment, the solvent is undecane and the extractant is trioctylphosphine oxide. The wood extract is contacted with the solvent and extractant in order to extract the acetic acid from the wood extract. The acetic acid is then recovered from the solvent and extractant.

The invention relates to a composite extractant used in a metal indium extraction process. The composite extractant is formed by mixing Bis(2-ethylhexyl)phosphate (P204), trioctylphosphine oxide and hexylphosphine oxide mixture liquid (C923) and trialkyphosphine oxides (TRPO) according to certain proportion. After being diluted with sulfonated kerosene, the composite extractant is used as an extractant used for metal indium extraction. The composite extractant has good chemical stability, good selectivity and high indium extraction efficiency which can achieve more than 90%, simultaneously canreduce the extractant emulsification, is easy for re-extraction, and the demand to extraction conditions of a system is not high.

The invention belongs to the technical field of quaternary chalcogenide semiconductor materials, and specifically discloses a Cu 2 ZnB 2 S 3 Nanorods were prepared as follows: under an inert atmosphere, copper acetylacetonate, zinc acetate, bismuth nitrate, and trioctylphosphine oxide were mixed in a stoichiometric ratio to form a complex, and then the sulfur precursors dodecanethiol and t-dodecylphosphine oxide were added. Alkylthiol, reacted for 1 to 3 hours, and separated to obtain the Cu 2 ZnB 2 S 3 Nano stave. Compared with the existing quaternary chalcogenide semiconductor materials, the photocatalytic performance of the nanorods of the present invention is improved. The present invention provides a kind of brand-new Cu 2 ZnB 2 S 3 Nanorods can be used in photocatalysis, photovoltaics, and photodiode sensor materials, and have good application prospects in the manufacture of LEDs, integrated circuits, transistors, and semiconductor lasers.

The invention provides a modified flame retardant plastic binder and relates to the technical field of binders. The plastic binder comprises 55-65 parts of solution, 20-30 parts of phenolic resin, 25-35 parts of polyethene, 7-14 parts of sodium alginate, 9-17 parts of sodium hexametaphosphate, 5-12 parts of light stabilizer, 3-7 parts of mildew preventive, 2-6 parts of zinc oxide, 4-8 parts of cupric oxide, 18-25 parts of flame retardant material and 11-16 parts of insulating material, wherein the solution comprises 20-26 parts of triethyl phosphate, 12-18 parts of trioctylphosphine oxide, 13-18 parts of diethyl malonate, 15-22 parts of triallyl cyanurate and 6-12 parts of allyl glycidyl ether. The binder has the benefits that the binder is higher in flame retardancy and insulativity, simple in preparation technology and good in safety and reliability.

The invention discloses a wurtzite manganese selenide nanosheet material and a preparation method of the wurtzite manganese selenide nanosheet material. The wurtzite manganese selenide nanosheet material is characterized in that the wurtzite manganese selenide nanosheet material is prepared by reaction of divalent manganous salt, selenium, trioctylphosphine oxide and ligand; the crystal structure is ligand wurtzite structure and the shape is a square slice; the wurtzite manganese selenide nanosheet has adjustable dimension. The wurtzite manganese selenide nanosheet prepared by the invention is adjustable in dimension, good in dispersing property, high in phase purity, good in crystallinity, and uniform in grain diameter distribution; the preparation method is simple in operation, short in reaction time, high in repeatability, and others; the invention has a certain application potential in photocatalysis, solar cell, rare magnetic material and other fields.

The invention discloses a flame-retardant partition wall for space leasing. The flame-retardant partition wall comprises a set of two-layer flame-retardant plate bodies and a filling layer arranged between the two-layer flame-retardant plate bodies; the two-layer flame-retardant plate bodies are flame-retardant polyvinyl chloride double-layer plate materials containing flame-retardant smoke inhibitors, and the flame-retardant smoke inhibitors are prepared and obtained after alkyl hypophosphite, tributyltin and trioctylphosphine oxide as shown in a formula (I) are subjected to heating contact at the temperature of 200-300 DEG C; and in the formula (I), R1 is C1-C6 alkyl or phenyl, R2 is C1-C6 alkyl or phenyl, M is a metal element, and n is a positive integer from 1 to 4. According to the flame-retardant partition wall for space leasing, the flame-retardant smoke inhibitors used in the flame-retardant plate bodies do not lose the flame-retardant property in the high temperature machiningprocess, generating of brittle materials is also not found, and the obtained flame-retardant plate materials are good in mechanical properties, flame retardant and environmentally friendly.

The invention relates to a preparation method of a pyrite-type ferrous disulfide nanoscale single-crystal semiconductor material. The preparation method comprises the following steps that 1, an iron source and trioctylphosphine oxide are mixed; and the mixture is dissolved in oleylamine, then is stirred and is filled with argon or nitrogen so that oxygen is removed and an iron source precursor is obtained; 2, the iron source precursor is heated in an oil bath with stirring so that an iron source solution is obtained; 3, a sulfur source is dissolved in oleylamine, then is stirred and is filled with argon or nitrogen so that oxygen is removed and a sulfur source solution is obtained; 4, the sulfur source solution is heated, then is extracted by a needle tubing and then is fast injected into the iron source solution; the oil bath for heating the iron source solution is heated; and the mixed solution undergoes a reaction to produce pyrite-type ferrous disulfide colloid; and 5, the pyrite-type ferrous disulfide colloid is cooled to a room temperature and then is added with a trichloromethane-ethanol mixed solution; the mixture is subjected to washing and centrifugation until an upper centrifugate is colorless; and the washed sample is sealed in a chloroform solution. The pyrite-type ferrous disulfide nanoscale single-crystal semiconductor material obtained by the preparation method has uniform particle sizes and morphology, and stable quality. The preparation method has good repeatability.

The invention discloses a method for removing impurity peaks in a quantum dot emission spectrum, and belongs to the technical field of semiconductors. The method comprises the following steps: freezing a quantum dot solution to precipitate quantum dots corresponding to impurity peaks, and then removing precipitates, wherein quantum dots in the quantum dot solution comprise at least one of II-VI group quantum dots and III-V group quantum dots, and a first ligand coordinated with quantum dot cation elements in the quantum dot solution comprises tri-n-octyl phosphine oxide, octadecyl ortho-phosphate or oleic acid. According to the method, impurity peaks in the quantum dot emission spectrum can be effectively removed, and later growth of quantum dots is facilitated.

The invention discloses a preparation method of a fire-retardant partition wall for space lease. The fire-retardant partition wall for space lease comprises a group of double-layer flame-retardant plate bodies and a filling layer arranged between the double-layer flame-retardant plate bodies, wherein the double-layer flame-retardant plate bodies are a flame-retardant polyvinyl chloride double-layer board material containing a flame-retardant smoke suppressant, and the flame retardant smoke suppressant is prepared through heating contact of an alkyl phosphinate as shown in a formula (I), tributyltin, tri-n-octylphosphine oxide and melamine at 220-280DEG C, wherein in the formula (I): R1 is C1-C6 alkyl or phenyl, R2 is C1-C6 alkyl or phenyl, M is a metal element, and n is a positive integerfrom 1 to 4. According to the preparation method of the fire-retardant partition wall for space lease, the flame-retardant smoke suppressant does not lose flame-retardant performance during a high-temperature processing process, and does not produce fragile substances; and the obtained fire-retardant partition wall has good mechanical properties, is flame-retardant, and is environmentally friendly, therefore, the fire-retardant partition wall has very high promotion and application values.