40 results about "Sodium selenide" patented technology

The invention relates to a bridged dipyrene-3,4,6,7-12, 13, 15, 16-octcarboxylic acid tetraimide compound containing sulphur atoms or selenium atoms and a preparation method thereof. 1,6, 7,12-tetrahalogenated pyrene-3,4-9,10-tetracarboxylic acid diimide compound or 1,9,10,18-tetrahalogenated dipyrene-3,4,6,7-12, 13, 15, 16-octcarboxylic acid tetraimide compound, sodium sulfide or sodium selenide, a catalyst, an amino acid ligand and inorganic base are mixed; then an organic solvent is added; the reaction is carried out under the protection of inert gas; the product is dissolved in the solvent, is washed in sodium chloride aqueous solution, and is dried and filtrated; then the solvent is distilled to dryness; and the bridged dipyrene-3,4,6,7-12, 13, 15, 16-octcarboxylic acid tetraimide compound containing sulphur atoms or selenium atoms in the lateral position showed by formula(I) or (II) is obtained through column chromatography separation. The yield after purification is 10 to 40 percent.

The invention provides a method for preparing a photocatalytic material from heavy metal ions in a biological adsorption solution. Based on a biological adsorption technology, the heavy metal ions in industrial wastewater are adsorbed and enriched onto biomass powder particles, then the biomass powder loaded with the heavy metal ions is subjected to a contact reaction with reagents (sodium sulfide, sodium hydrosulfide, thiourea, hydrogen sulphide or sodium selenide, sodium hydrogen selenide, selenourea, hydrogen selenide and the like ) which can provide an S<2-> or Se<2-> source, so that the heavy metal ions adsorbed on the biomass powder particles are in-situ converted into corresponding metal sulfides (selenides). The method realizes a new way of high-valued utilization of various industrial wastewater containing low-concentration valuable metal ions, reaches purposes of economically and efficiently removing the low-concentration metal ions in the industrial wastewater in virtue of biological adsorption, has the highlight advantages of being fast to adsorb, low in cost, short in powder making flow, large in yield, and easy to scale.

Provided are a sputtering target that is capable of forming a Cu—Ga film, which has an added Ga concentration of 1 to 40 at % and into which Na is well added, by a sputtering method and a method for producing the sputtering target. The sputtering target has a component composition that contains 1 to 40 at % of Ga, 0.05 to 2 at % of Na as metal element components other than F, S and Se, and the balance composed of Cu and unavoidable impurities. The sputtering target contains Na in at least one form selected from among sodium fluoride, sodium sulfide, and sodium selenide, and has a content of oxygen of from 100 to 1,000 ppm.

The invention discloses a method for preparing bismuth selenide nano particles, which comprises preparation of starch solution, preparation of bismuth nitrate solution, preparation of sodium selenide sulfite solution, preparation of bismuth selenide colloidal solution and preparation of the bismuth selenide nano particles so as to obtain a novel semiconductor quantum dot material of the bismuth selenide nano particles, wherein the used raw material is nontoxic bismuth nitrate, the used surfactant or stabilizing agent is nontoxic pollution-free soluble starch, the used solvent is nontoxic pollution-free purified water, the used precipitating agent is nontoxic pollution-free acetone, and the used washing agent is nontoxic pollution-free acetone or anhydrous ethyl alcohol, so the method has little harm to human body and pollution to environment, has simple and reasonable process and lower cost for preparing the bismuth selenide nano particles, and develops a new way for the non-oxide semiconductor quantum dot material. Therefore, the method for preparing the bismuth selenide nano particles has the advantages of simple and reasonable process, lower cost, innocuity and little pollution.

The invention belongs to the technical field of selenium-containing compounds and discloses a selenium-containing compound selenium sugar, selenium glucoside and a preparation method thereof. The method comprises the following steps: using corresponding glycosyl bromide protected by a protecting group for reacting with selenourea and then degrading under an alkaline condition, or using the corresponding glycosyl bromide protected by the protecting group for directly reacting with selenium hydrogen silicate or using the corresponding glycosyl bromide protected by the protecting group for reacting with sodium selenide and potassium selenide; using the acquired raw material for reacting with a corresponding hydrocarbylation reagent or the corresponding glycosyl bromide protected by the protecting group represented by R2 or using the corresponding glycosyl bromide protected by the protecting group for directly reacting the corresponding selenol or sodium selenium alcohol and selenium potassium alcohol; and lastly, removing protection, thereby acquiring target compounds. The compound prepared according to the invention can be used for obviously improving the absorption and conversion of organism for selenium element, so that the selenium element can be utilized by a human body.

The production process of high-selenium nutritious black bean powder includes the following steps: 1. preparing soaking solution via adding sodium selenide or potassium selenide, pectase and cellulase into water; 2. soaking black bean in the soaking solution; 3. germinating through showering soaked black bean, spreading in a pan, covering with gauze and spraying the soaking solution for 5-6 hr; and 4. deactivating enzyme through steaming, cooling and crushing to obtain high-selenium nutritious black bean powder. The high-selenium nutritious black bean powder may be also puffed while adding starch. The high-selenium nutritious black bean powder has high nourishing function.

The invention belongs to the field of chemical conversion, and particularly discloses a method and a device for preparing selenocystine under mild conditions. The method specifically comprises the following steps: mixing selenium powder, a strong alkaline substance, water and sodium triacetoxyborohydride, adding a 3-chloro-L-alanine aqueous solution, and carrying out a stirring reaction; and afterthe reaction is finished, adding an acid, filtering, adding an alkali into the obtained filtrate to adjust the pH value, and carrying out standing filtering to obtain filter residues, ie., selenocystine. According to the invention, the method has the advantages of few side reactions, high raw material utilization rate, and almost no generation of hydrogen or other undesired reactions; and a sodium diselenide solution is prepared by using sodium triacetoxyborohydride as a reducing agent under a strong alkaline condition, so that the reaction is mild, safe and reliable, the operation is simpleand feasible, the reaction process is mild and controllable, and the method has good application prospect.

Provided is a sputtering target which contains Na in a high concentration and, despite this, is inhibited from discoloring, generating spots, and causing abnormal discharge and which has high strength and rarely breaks. Also provided is a process for producing the sputtering target. The sputtering target has a composition which contains 10-40 at% Ga and 1.0-15 at% Na as metallic components other than F, S, and Se, with the remainder comprising Cu and unavoidable impurities, the Na being contained in the form of at least one Na compound selected from sodium fluoride, sodium sulfide, and sodium selenide. The sputtering target has a theoretical density ratio of 90% or higher, a folding strength of 100 N / mm2 or higher, and a bulk resistivity of 1 mOmegacm or less. The number of 0.05 mm2 or larger aggregates of the at least one of sodium fluoride, sodium sulfide, and sodium selenide present per cm2 of the target surface is 1 or less on average.

The invention discloses a preparation method of an inorganic compound sodium selenide and a device of the preparation method. The preparation method comprises the steps of: (1) putting metallic sodium and elemental selenium in a reactor in a vacuum glove box, (2) highly vacuumizing, charging nitrogen to, cleaning and highly vacuumizing the reactor repeatedly for 3-4 times, (3) charging liquid ammonia to allow metallic sodium to be completely dissolved in liquid ammonia, (4) discharging gasified ammonia from the reactor via high-purity nitrogen, (5) stirring, (6) after gasifying liquid ammonia, vacuumizing the reactor, and (7) heating the reactor, then cooling to the room temperature, and taking a material to obtain a sodium selenide finished product. According to the preparation method, metallic Na and elemental Se are isolated from air all the time from a proportioning stage to a combination reaction course, and the purity of raw materials and synthesized sodium selenide and the safety in a reaction course are effectively ensured. At the same time, the device realizes a complete preparation technical flow of sodium selenide synthesis, ammonia volatilization, in situ synthesized polycrystal drying and the like.

Provided are a sputtering target that is capable of forming a Cu—Ga film, which has an added Ga concentration of 1 to 40 at % and into which Na is well added, by a sputtering method and a method for producing the sputtering target. The sputtering target has a component composition that contains 1 to 40 at % of Ga, 0.05 to 2 at % of Na as metal element components other than F, S and Se, and the balance composed of Cu and unavoidable impurities. The sputtering target contains Na in at least one form selected from among sodium fluoride, sodium sulfide, and sodium selenide, and has a content of oxygen of from 100 to 1,000 ppm.

The invention relates to a preparation method for a selenium-containing macromolecule fluorescence probe. The method comprises the following steps: enabling o-position halogenated benzaldehyde and sodium diselenide to react in an organic solvent at 90-120 DEG C, thereby acquiring 2,2'-diphenyl diselenide; enabling 2,2'-diphenyl diselenide to react with 2,4-dimethyl pyrrole under an effect of catalyst, adding an oxidizing agent for continuing reacting, adding organic alkali and a complexing agent and reacting at 20-40 DEG C, thereby acquiring 2,2'-difluoro boron pyrrole diphenyl diselenide; performing free radical polymerization reaction on 2,2'-difluoro boron pyrrole diphenyl diselenide and a compound containing double bond at 20-70 DEG C, thereby acquiring the selenium-containing macromolecule fluorescence probe. The invention also discloses the selenium-containing macromolecule fluorescence probe prepared according to the method. According to the method provided by the invention, the selenium-containing diselenide is firstly prepared and then is utilized to regulate the polymerization of monomer, so that the selenium-containing macromolecule fluorescence probe can be acquired. The selenium-containing macromolecule fluorescence probe can be used for detecting oxides.

The invention discloses a gemini surfactant containing a selenium atom in a space group and a preparation method thereof. The preparation method includes the following steps: a step of intermediate preparation, namely a step of reacting long chain tertiary amines with dihaloalkanes to obtain an intermediate M; and a step of gemini surfactant preparation, namely a step of reacting the intermediateM with sodium selenide or disodium diselenide and purifying to obtain the gemini surfactant containing a selenium atom in the space group. The gemini surfactant containing a selenium atom in the spacegroup has the advantages of high surface activity, low critical micelle concentration, good compatibility and the like of a gemini surfactant and the sterilization, anti-inflammation and anti-oxidation functions of a selenium atom.

The invention discloses a stem and leaf surface controlling selenium-rich fertilizer for increasing yield of crops, and a method for applying the controlling selenium-rich fertilizer. The controllingselenium-rich fertilizer comprises an Se fertilizer, and the Se fertilizer is an aqueous solution of one or more selected from a selenide, a selenide hydrate, a sulfoselenide and a sulfoselenide hydrate, wherein the selenide is one or two selected from potassium selenide and sodium selenide, and the sulfoselenide is one or two selected from potassium sulfoselenide and sodium sulfoselenide. Duringapplication, the selenium-enriched controlling fertilizer is diluted into a spraying liquid, and the total concentration of selenium and sulfur in the spraying liquid is in a range from 0.1mg / L to 10mg / L. The selenium-enriched controlling fertilizer prevents toxic and harmful heavy metals from entering edible parts, converts selenium into organic selenium compounds through physiological metabolismin organisms, and enriches the organic selenium compounds in edible parts, and selenium-enriched nutrient crops are obtained.

The invention relate to a scale removing and inhibiting agent for a later-stage oil well with tertiary oil recovery, which is used for removing and inhibiting the scale of the later-stage oil well with tertiary oil recovery and is characterized by comprising the following components in percentage by weight: 15.2-17.8% of hydroxy pentamethylene phosphonic acid, 3.5-4.0% of hydrochloric acid, 3.0-3.2% of hydrofluoric acid, 0.05-0.06% of vitamin C, 21.5-24% of phosphino polymaleic anhydride scale inhibitor, 2.5-3.0% of methenamine, 5.7-6.2% of USP2 with a pentadecyl, 2.5-3.0% of C12-C18 fatty alcohol polyoxyethylene (10) ether, 0. 001-0.0015% of 0.3-0.5% aqueous solution of sodium selenide, 15-20% of methanol and the balance of water, wherein all the components account for 100 percent by weight. The scale removing and inhibiting agent can be added to the later-stage oil well with tertiary oil recovery during the daily maintenance of the oil well to remove or slow down the oil well scale deposition and prolong the pump detection period, 50-75mg of scale removing and inhibiting agent is added to the oil well annulus for the recovery of 1 litter of oil from the oil well, and the pump detection period can be prolonged by 1-2 times.

The invention discloses a multi-system long-time antiscale agent for an oil well. The multi-system long-time antiscale agent is prepared from the following raw materials in parts by weight: 7 to 11 parts of fluoroboric acid, 3 to 5 parts of fatty alcohol-polyoxyethylene ether, 15 to 20 parts of hydroxy penta methylene phosphonic acid, 3 to 5 parts of hydrochloric acid, 2 to 4 parts of hydrofluoric acid, 0.05 to 0.06 part of vitamin C, 3 to 4 parts of methenamine, 0.001 to 0.002 part of sodium selenide aqueous solution, 15 to 25 parts of methyl alcohol, 8 to 12 parts of sodium gluconate, 6 to 8 parts of sodium ascorbate, 1 to 3 parts of ethydiaminedhephen acetic-Na, 15 to 25 parts of polyether polymeric chelating agent, 5 to 10 parts of emulsifier and 3 to 5 parts of stabilizer, wherein the emulsifier is sodium polyoxyethylene carboxylate, and the stabilizer is potassium polymaleate. The multi-system long-time antiscale agent has the effects of dispersion, solubilization, crystal distortion and electrostatic repulsion, and the multi-system long-time antiscale agent stays in stratum holes through absorption or a chemical reaction on stratum rock surfaces and is slowly released under the action of output liquid or injected water, so that a long-time antiscale effect is achieved, thereby increasing the liquid production capacity and the oil production capacity of the oil well and achieving the purposes of stable yield and increase yield.

The invention discloses a method for preparing a beta-ionone epoxidation catalyst from wheat straw. The preparation method comprises the following steps: uniformly mixing wheat straw dry powder with sodium selenide according to a ratio of 10-16 g: 1 mmol, adding 2-trifluorosiloxyethanol with a molar weight of 0.3-0.5 times of sodium selenide, carrying out stirring for 24 hours at a temperature of10-30 DEG C, and then filtering and drying the solid to obtain the catalyst material. The material has high catalytic activity and can catalyze a selective epoxidation reaction of beta-ionone.

The invention provides an arsenic-cadmium-lead composite polluted farmland multifunctional restoration material and an application method thereof. The restoration material comprises a foliar sprayingagent and a soil passivator, wherein the foliar spraying agent is a single controlled-release fertilizer SP or is composed of controlled-release fertilizer SP and a controlled-release fertilizer F; wherein the controlled-release fertilizer SP is a solution formed by mixing one or more of a selenide, potassium metasilicate and monopotassium phosphate and dissolving an obtained mixture in water, theselenide is any one of sodium selenide and potassium selenide, and the solution of the controlled-release fertilizer SP contains potassium ions; the controlled-release fertilizer F is a ferric salt or a solution formed by mixing the ferric salt and manganese sulfate n water, and the ferric salt is any one or a mixture of ferric sulfate and ferrous sulfate; and the soil passivator is an iron-basedpassivator and / or an alkali-based passivator. According to the types of pollutants in soil and agricultural products, the soil passivator and the foliar spraying agent are selected in a targeted manner, and a scientific application method is matched, so that the safety of the agricultural products can be effectively protected, and the yield and quality of the agricultural products are improved.

The invention relates to the technical field of stone treatment, in particular to a stone pretreatment method for a stone reverse beating process, which comprises the following steps of: S1, stone cutting, S2, heating the stone to 120 DEG C or above, S3, putting the stone into a sealed container, injecting a liquid waterproof treatment agent the container, keeping the pressure in the container at1-2 MPa, and conducting constant-pressure soaking for 5-10 min, S4, taking out the stone and naturally cooling the stone, and 5, polishing the surface of the stone. The waterproof treatment agent comprises the following components in parts by mass: 100 parts of polypropylene, 60 to 70 parts of nanometer talcum powder, 3-5 parts of a silane coupling agent, 1-2 parts of sodium telluride, and 0.5 to1 part of sodium selenide. The method has the advantages that a user does not need to worry about scraping of the waterproof treatment agent by aggregates in steel bars or concrete, the stone always keeps good waterproof and anti-seepage effects, and the saltpetering prevention effect is good and stable.

The invention discloses a preparation method of selenide sodium alginate hydrogel. The method comprises the following steps: adding alginic acid into an activating agent; stirring and dissolving; thenincreasing the temperature and reflowing; drying the solvent by distillation after the reaction is finished, so as to obtain an alginic acid pre-crosslinked substance; dissolving the alginic acid pre-crosslinked substance into a reaction agent; adding a catalyst and a sodium diselenide water solution; stirring and reacting; washing twice with deionized water; drying by distillation to obtain selenide alginic acid; adding the selenide alginic acid into water; dropwise adding a sodium hydroxide water solution; stirring and dissolving; then packing; and performing light crosslinking treatment, thus obtaining the selenide sodium alginate hydrogel. The preparation method is simple in processes and low in energy consumption, and the raw materials are low in price and easy to obtain; the naturalproduct, namely, alginic acid, is used as the main raw material, and is nontoxic, harmless, high in biocompatibility, environmentally friendly, and applicable to industrial production; the prepared hydrogel is high in biocompatibility, high in mechanical intensity, high in transparence, beneficial for observing and monitoring, and worthy of popularization.

The invention relates to a preparation method for a selenium-containing macromolecule fluorescence probe. The method comprises the following steps: enabling o-position halogenated benzaldehyde and sodium diselenide to react in an organic solvent at 90-120 DEG C, thereby acquiring 2,2'-diphenyl diselenide; enabling 2,2'-diphenyl diselenide to react with 2,4-dimethyl pyrrole under an effect of catalyst, adding an oxidizing agent for continuing reacting, adding organic alkali and a complexing agent and reacting at 20-40 DEG C, thereby acquiring 2,2'-difluoro boron pyrrole diphenyl diselenide; performing free radical polymerization reaction on 2,2'-difluoro boron pyrrole diphenyl diselenide and a compound containing double bond at 20-70 DEG C, thereby acquiring the selenium-containing macromolecule fluorescence probe. The invention also discloses the selenium-containing macromolecule fluorescence probe prepared according to the method. According to the method provided by the invention, the selenium-containing diselenide is firstly prepared and then is utilized to regulate the polymerization of monomer, so that the selenium-containing macromolecule fluorescence probe can be acquired. The selenium-containing macromolecule fluorescence probe can be used for detecting oxides.

The present invention relates to a kind of preparation method of Au / CuSe tangential heterogeneous nano material, comprising: S1. Prepare nano-gold colloid solution under cetyltrimethylammonium bromide system, the particle diameter of gold nanosphere is 18~ 22nm; S2. Preparation of sodium selenium hydride solution, using gold nanospheres as the growth substrate, sodium selenium hydride and copper acetate as precursors, ascorbic acid as reducing agent, and hexadecyltrimethylammonium bromide as the surface by aqueous phase synthesis Activator, vacuum reaction in the presence of hexamethylenetetramine to grow two-dimensional copper selenide nanodisks in the tangential direction of gold nanospheres to obtain an aqueous solution of Au / CuSe tangential heterogeneous nanomaterials; S3. Separation, cleaning and Dry to obtain Au / CuSe tangential heterogeneous nanomaterials. The invention utilizes an all-water phase method to prepare Au / CuSe tangential heterogeneous nanomaterials, and the obtained heterogeneous nanomaterials have stable morphology and structure, obvious double plasmon coupling effect, and excellent photocatalytic hydrogen production performance.

The invention discloses a method for preparing a 2-phenylselenite sulfuryl quinoxaline compound as shown in a formula (IV) under the catalysis of zinc, which comprises the following steps: fully reacting a quinoxaline compound as shown in a formula (I), sodium selenide as shown in a formula (II) and an iodobenzene compound as shown in a formula (III) in a DMF (Dimethyl Formamide) solvent by taking zinc sulfate as a catalyst and sodium ethoxide as alkali to obtain the 2-phenylselenite sulfuryl quinoxaline compound is prepared. The method provided by the invention has the advantages of low catalyst cost, meeting of green and environment-friendly requirements, few synthesis steps and simple post-treatment, and is suitable for large-scale production of pharmaceutical and chemical intermediates.

The invention belongs to the technical field of semiconductor materials, and relates to a preparation method of a graphene and zinc selenide and cadmium selenide core-shell microsphere composite nanomaterial. The method comprises the following steps: adding deionized water into selenium powder and sodium sulfite, and carrying out heating reaction while stirring under the protection of nitrogen toobtain a sodium selenide solution; dissolving zinc acetate, cadmium acetate and graphene oxide into water, adding the sodium seleno sulfate solution, adding hydrazine hydrate while stirring, transferring into a high-pressure reaction kettle taking polytetrafluoroethylene as a lining, and reacting at 80 DEG C for 5 hours; and putting the high-pressure reaction kettle into ice water for quenching,washing with deionized water and absolute ethanol, and carrying out vacuum drying to obtain the G / ZnSe-CdSe composite nano material. Three-order nonlinear absorption of the G / ZnSe-CdSe composite nanomaterial is saturated absorption, three-order nonlinear refraction of the G / ZnSe-CdSe composite nano material is self-focusing, and the G / ZnSe-CdSe composite nano material is expected to be applied tothe novel light control fields such as a mode-locked pulse laser, an optical switch, an optical memory and an optical modulator.

The invention provides a preparation method of L-selenocystine. The preparation method comprises the following steps: A) carrying out nucleophilic substitution reaction on sodium diselenide and N-acetyl-3-chloro-L-serine methyl ester to obtain N,N'-diacetyl-L-selenocystine dimethyl ester; B) hydrolyzing the N,N'-diacetyl-L-selenocystine dimethyl ester in a hydrochloric acid solution to obtain theL-selenocystine. The preparation method takes an N-acetyl-3-chloro-L-serine methyl ester chiral raw material as a substrate and sodium borohydride as a reducingagent, has the characteristics of easy-to-obtain and cheap raw materials, convenience for operation, moderate reaction conditions, single product, easiness for separation and high yield and the like and is suitable for industrial production. A test result proves that the specific rotatory power of the preparation method provided by the invention can reach that [alpha]D<20> is equal to -29.5 DEG (C 0.5, 0.1 MNaOH) and the highest yield of a product is 80.6 percent.

The invention provides a method for preparing a nanowire-woven spherical Sb2Se3 (antimony selenide) sodium-ion battery anode material. According to the method, polyvinylpyrrolidone and antimony potassium tartrate are added to a mixed solution of glycol and distilled water and stirred, and a solution A is obtained; sodium selenite is added to hydrazine hydrate and stirred, and a wine red solution B is obtained; the solution B is dropwise added to the solution A with stirring, and a mixed solution C is obtained; glycerinum is added to the mixed solution C, and the mixture is stirred uniformly, reacts under a vacuum condition at the temperature of 80-150 DEG C, left to age for 1-18 h and cooled to the room temperature after the reaction ends; finally, washing and drying are performed, and the nanowire-woven spherical Sb2Se3 sodium-ion battery anode material is obtained. The reaction process for preparation of nanowire-woven spherical Sb2Se3 is completed once, the process equipment is simple, the repetition is good, and the prepared Sb2Se3 electrode material has excellent electrochemical performance.

The invention discloses a method for preparing a benzo-6, 8-dihydroisoquinoline-1-selenious sulfuryl benzamide compound as shown in a formula (IV) through bimetallic catalysis. The preparation method comprises the following steps: fully reacting 1,2,3,4 tetrahydroisoquinoline compound shown in a formula (I), sodium selenide compound shown in a formula (II) and 2 -bromobenzaldehyde compound shown in a formula (III) in DMSO solvent with magnesium acetate and copper acetate as catalysts and cesium carbonate as alkali, and treating the product to obtain benzo -6,8- dihydroisoquinoline- 1- selenious sulfonylbenzamide compound. The method has the advantages of low cost, simplicity in operation, excellent yield, meeting of green synthesis requirements and the like, and is suitable for industrial synthesis of drug intermediates related to dihydroisoquinoline compounds.

The invention relates to a method for preparing a Pt-modified Au / CuSe tangential heterogeneous nanomaterial, comprising: S1. preparing a nano-gold colloid solution under a hexadecyltrimethylammonium bromide system; S2. adopting aqueous phase synthesis The method uses gold nanospheres as the growth substrate, sodium selenium hydride and copper acetate as precursors, ascorbic acid as the reducing agent, and hexadecyltrimethylammonium bromide as the surfactant, and reacts under vacuum to obtain Au / CuSe tangential heterogeneous Nanomaterial aqueous solution; S3. Growing Pt nanoparticles on the surface of gold nanospheres and two-dimensional copper selenide nanodisks to obtain Pt-modified Au / CuSe tangential heterogeneous nanomaterials. The present invention utilizes the all-aqueous phase method to prepare Pt-modified Au / CuSe tangential heterogeneous nanomaterials, and the prepared heterogeneous nanomaterials have stable and controllable morphology, and the double plasmon coupling effect is obvious. There is significant photon absorption in the infrared region, and the photocatalytic hydrogen production performance is excellent.

The invention belongs to the field of chemical transformation, and specifically discloses a method and a device for preparing selenocystine under mild conditions. The method is specifically to mix selenium powder, strong alkaline substance, water, and sodium triacetoxyborohydride, then add 3-chloro-L-alanine aqueous solution, and carry out stirring reaction; after the reaction is completed, after adding After acid and filtration, add alkali to the obtained filtrate to adjust the pH, and then stand and filter to obtain the filter residue, which is selenocystine. The invention has few side reactions, high utilization rate of raw materials, almost no generation of hydrogen or other undesired reactions. In addition, using sodium triacetoxyborohydride as a reducing agent to prepare sodium diselenide solution under strong alkaline conditions has very mild reaction, safety and reliability, simple and easy operation, mild and controllable reaction process, and has good application prospects.

The invention discloses a liquid chemical fertilizer for culturing living aquatic plants in ornamental aquarium, wherein the liquid chemical fertilizer comprises potassium sulphate, potassium nitrate,potassium dihydrogen phosphate, magnesium sulfate heptahydrate, boric acid, Edta iron, Edta manganese, Edta zinc, Edta copper, sodium molybdate dihydrate, fulvic acid powder, iodine, sodium selenide,chromium potassium sulfate, ascorbic acid (vitamin C), potassium sorbate (preservative), diethyl aminoethyl hexanoate (DA-6) 98%, brassinolide 0.15% raw powder and L-glutamic acid. According to the invention, with the liquid chemical fertilizer, waterweeds and other aquatic plants can be promoted to show high ornamental value instead of completely growing according to the natural form, the adversity resistance of the trimmed ornamental aquatic plants is enhanced, the good display of waterweed tank landscaping in the field of ornamental aquarium is realized, the existing aquatic plant cultivation technology is perfected, more aquatic plant tank landscaping enthusiasts and practitioners can easily, conveniently, efficiently and safely participate in aquatic plant cultivation, the growth speed of aquatic plants is increased, the fertilizer absorption efficiency is improved, tillering is increased, rooting and lateral bud germination of newly planted aquatic plants are promoted, and the aquatic plants are thick and strong.