566 results about "Sulfite salt" patented technology

The invention provides a preparation method of 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride, which comprises the following steps: salifying 4-fluoro-3, 5-dimethylaniline serving as a substrate with concentrated hydrochloric acid, reacting with sodium nitrite to prepare a diazo solution, reducing the diazo solution into corresponding phenylhydrazine by using alkaline sodium sulfite as a reducing agent system, and reacting the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride with the diazo solution to prepare the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride. And acidizing the 2, 5-dimethyl phenylhydrazine to obtain corresponding phenylhydrazine hydrochloride. According to the preparation method, sodium sulfite which is low in cost and easy to obtain is used as a reducing agent, the defects that metal residues are high, the environment is prone to being polluted and the raw material cost is high due to the fact that a metal reducing agent is adopted when phenylhydrazine hydrochloride is prepared in the prior art are overcome, the reaction is completed in a water phase, no organic solvent is adopted, and the concept of green chemistry is met; and the problems of complicated post-treatment and easy pollution caused by the adoption of an organic solvent can be effectively avoided.

The invention relates to the technical field of membrane separation, in particular to a high-flux high-salt rejection rate reverse osmosis membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: sequentially contacting a porous base membrane with a water phase solution and an oil phase solution to generate an interfacial polymerization reaction to form a primary reverse osmosis membrane, and sequentially contacting the primary reverse osmosis membrane with a nitrous acid or salt solution thereof and a hydrosulfite solution to obtain the reverse osmosis membrane with high flux and high salt rejection rate, the water-phase solution contains a water-phase cosolvent, and the oil-phase solution contains an oil-phase cosolvent. According to the preparation method, cosolvents are creatively added into a water-phase solution and an oil-phase solution in an interfacial polymerization reaction process to regulate and control the microstructure of a polyamide layer, and a diazo reaction promotes further crosslinking of residual aniline groups, so that in-situ densification regulation and control of a polyamide network structure are realized; the trade-off effect of the water flux and the salt rejection rate of the traditional reverse osmosis membrane is successfully broken through.

The invention discloses a yellow reduction dyeing agent, a dyeing solution and a preparation method and application thereof, and relates to the technical field of dyeing and finishing. According to the yellow reduction dyeing agent provided by the invention, the 5-hydroxy-3-aminopyridine-2, 6-(1H, 3H)-diketone is adopted as a reduction dye, and the sodium sulfite is independently used as a reducing agent for reduction dyeing, so that the obtained dye leuco body is proper in dyeing capacity, and a dyed fabric can show excellent light brittle damage resistance. The fabric dyed by the dyeing agent has similar breaking strength before and after dyeing and even is slightly improved after dyeing and illumination, meanwhile, the color depth K / S of the fabric dyed by the dyeing agent reaches 3.2 or above, the dry and wet rubbing color fastness can reach level 4 or above, and the color fastness to illumination reaches level 6 or above.

The invention relates to the technical field of preparation of an electrolyte for a vanadium redox flow battery, in particular to a reduction method of an alkaline vanadium-containing solution during short-process preparation of a vanadium electrolyte. The reduction method comprises the following steps: (1) adding a reducing agent sodium sulfite into an alkaline vanadium-containing solution and dissolving; and (2) acid is added into the solution obtained after dissolving in the step (1), the pH is adjusted, a reduction reaction is conducted, and vanadium is reduced to be tetravalent. The method provided by the invention effectively solves the problem of vanadium loss caused by precipitation generated in the sequential operation process of acidification and reduction of the alkaline vanadium-containing solution in the prior art, and meanwhile, the method provided by the invention is easy for engineering implementation.

The present invention provides a preparation method of high-viscosity hydroxypropyl methylcellulose. A preparation method of high-viscosity hydroxypropyl methylcellulose comprises the following steps: grinding and alkalizing refined cotton cellulose; adding methyl chloride and propylene oxide for etherification reaction; successively adding a crosslinking agent and an aqueous fulvic acid solution for reaction; adding potassium naphthylacetate, sodium sulfite and sodium molybdate and then drying. In the present invention, during the etherification reaction of alkalized cellulose, a crosslinking agent prepared by mixing sodium tetraborate and sodium tripolyphosphate is added for crosslinking reaction, which can reduce the content of water-soluble groups of the prepared hydroxypropyl methylcellulose, achieving the effect of increasing the viscosity of hydroxypropyl methylcellulose. Coating the crop surface with the high-viscosity hydroxypropyl methylcellulose not only has a better surface glazing effect, but also can increase its sugar content.

The invention provides high-performance silver powder suitable for TOPCon battery fine grid silver paste, a preparation method of the high-performance silver powder and the silver paste, and belongs to the technical field of photovoltaic materials. The preparation method comprises the steps that a silver salt solution and a composite reducing agent are mixed, a first-stage hydrothermal reaction is carried out at the first temperature, a second-stage hydrothermal reaction is carried out at the second temperature, and silver powder is obtained after centrifugation, washing and drying; wherein the composite reducing agent is selected from a mixture of two of potassium tartrate, sodium sulfite and ferrous sulfate. According to the method, gradual growth and crystallinity improvement of silver crystal nucleuses are achieved through two-stage heating, particle aggregation or uneven morphology caused by rapid reduction is avoided, in addition, the adopted composite reducing agent combination is remarkably superior to a single reducing agent (such as ascorbic acid), and the morphology and particle size distribution of the silver powder can be more accurately regulated and controlled.

The invention relates to an indole hair dye based on air oxidation. The hair dye provided by the invention is characterized in that a chemical strong oxidant is not added, and oxygen in air can be catalyzed by using an air oxidation catalyst and a metal ion catalyst to naturally finish the oxidative polymerization process of indole substances (natural bionic melanin precursor substances). The used reducing agent is a combination of cysteine and a derivative thereof and sodium sulfite and a derivative thereof, the oxidative polymerization speed of indole substances can be controlled, and finally generated melanin macromolecules are embedded in hair cortex, so that white hair is obviously blackened. The natural oxidation process does not need hydrogen peroxide, destructive strong base or organic base, so that the use of harmful chemical reagents is reduced, the formula is simplified, the hair dyeing process is milder, potential hazards to hair and scalp are reduced, and the natural oxidation hair dye is safe, environmentally friendly and sustainable.

The present invention provides a ship exhaust gas desulfurization device and a desulfurization method, which include a sulfur-containing ship exhaust gas pretreatment system, a seawater pretreatment system, a membrane contactor, and a seawater post-treatment system; the outlet end of the sulfur-containing ship exhaust gas pretreatment system is connected to the shell-side inlet end of the membrane contactor for sending the dust- and oil-removed exhaust gas into the shell side of the membrane contactor; the outlet end of the seawater pretreatment system is connected to the tube-side inlet end of the membrane contactor for sending the pretreated seawater into the tube side of the membrane contactor; the membrane contactor is a membrane contactor filled with polytetrafluoroethylene hollow fiber hydrophobic microporous membranes; the inlet end of the seawater post-treatment system is connected to the tube-side outlet end of the membrane contactor for post-treating the seawater after absorbing sulfur dioxide and oxidizing sulfite into sulfate. The ship exhaust gas desulfurization device described in the present invention has a high integration degree, a compact volume, and a high desulfurization efficiency, can achieve efficient desulfurization of ship exhaust gas, and has good application prospects.

A sodium ion battery electrolyte, a sodium ion battery and an electrical device. The sodium ion battery electrolyte comprises a sodium salt and a sulfonate compound, and the sulfonate compound comprises one or more of compounds represented by formula (I), formula (II) and formula (III), wherein R1, R5, R6, R9 and R10 are each selected from C1-C3 alkylene groups, and R2, R3, R4, R7, R8 and R11 are each selected from C1-C3 alkyl groups or C1-C3 fluoroalkyl groups. The sulfonate compound contains both a sulfonate group and a carbonate group in the molecules, and thus can be used as a film-forming additive to promote generation of a uniform and stable SEI film rich in sulfates and sulfites on the surface of an electrode, thereby improving the cycle performance and the rate capability of the sodium ion battery.

The embodiment of the present invention discloses a sodium ion battery electrolyte, a sodium ion battery and an electrical device, wherein the sodium ion battery electrolyte comprises a sodium salt and a sulfonate compound, wherein the sulfonate compound comprises one or more compounds represented by formula (I), formula (II) and formula (III), wherein R1, R5, R6, R9 and R 10 independently selected from C1-C3 alkylene, R2, R3, R4, R7, R8 and R 11 Independently selected from C1-C3 alkyl or C1-C3 fluoroalkyl. The sulfonate compound contains both sulfonate and carbonate groups in its molecule, acting as a film-forming additive to promote the formation of a uniform and stable SEI film rich in sulfate and sulfite on the electrode surface, thereby improving the cycle performance and rate performance of sodium-ion batteries.

The invention relates to a method for purifying rhodium from a complex-component rhodium leaching solution, and belongs to the technical field of precious metal refining and purification. The method comprises the following steps: adding a reducing agent into rhodium leaching liquid for reduction to obtain RhCl3 primary purification liquid and insoluble slag; simultaneously adding sulfite and ammonium salt into the RhCl3 primary purification liquid to precipitate rhodium in the form of (NH4) 3Rh (SO3) 3; hydrochloric acid is added into the (NH4) 3Rh (SO3) 3 precipitation residues, heating and boiling are conducted, the (NH4) 3Rh (SO3) 3 precipitation residues are dissolved in the form of RhCl3 and enter a solution, SO3 < 2-> in the solution is removed in the form of SO2, and a secondary purification solution of RhCl3 is obtained; adding a strong oxidant into the secondary purified solution of RhCl3, and carrying out oxidation reaction to obtain RhCl4; adding alkali into the RhCl4 solution to adjust the pH value, and boiling to obtain RhO2. 2H2O precipitation slag; and the RhO2. 2H2O precipitation slag is sequentially subjected to pure water slurrying, hydrazine hydrate reduction, calcination and hydrogen reduction to obtain the high-purity metal rhodium. According to the method disclosed by the invention, the high-purity metal rhodium of which the purity is greater than 99.95% can be prepared, and the direct recovery rate of rhodium is greater than 97%.

The invention discloses modified humic acid as well as a preparation method and application thereof, and relates to the technical field of humic acid modification. The preparation method comprises the following steps: activating mineral source humic acid, and adding a manganese-based activator to obtain activated humic acid; adding activated humic acid, a grafting agent and a silane monomer into a cross-linking system, stirring, standing, and then heating for reaction; after the reaction is finished, adjusting the pH value to be alkaline, keeping heating and stirring, and then drying to obtain modified humic acid; wherein the grafting agent comprises the following raw materials: sodium sulfite and acetylacetone. The modified humic acid still has high water solubility in hard water, and flocculent precipitate formed by the humic acid and metal ions can be avoided.

The invention relates to the technical field of photocatalysis, and provides a preparation method of a copper-cuprous oxide-copper bismuthate ternary complex, which comprises the following steps: adding sodium bismuthate dihydrate, copper sulfate and sodium sulfite into a hydrothermal reaction kettle containing distilled water to obtain a solid-liquid mixture; and the solid-liquid mixture generates the copper-cuprous oxide-copper bismuthate ternary compound under a hydrothermal condition through a synergistic effect of a heterogeneous interface in-situ oxidation-reduction reaction of sodium bismuthate and a sodium sulfite solution and a homogeneous oxidation-reduction reaction of a copper sulfate solution and the sodium sulfite solution. The preparation method has the advantages that the elemental copper-cuprous oxide-copper bismuthate ternary compound is prepared by a one-pot method through cooperation of the out-phase interface in-situ oxidation-reduction reaction and the homogeneous oxidation-reduction reaction, and the preparation method is simple in preparation step, convenient to operate and easy to quantitatively control.

The invention discloses a method for producing a green packaging material by using field planting tobacco waste, which comprises the following steps: by taking tobacco stems as raw materials, extracting to obtain high-purity nicotine, extracting active chemical components to obtain tobacco stem residues, primarily treating the residual tobacco stems by an extruding and tearing machine to cut off and separate the tobacco stems into shreds, and drying the shreds to obtain the green packaging material. The cut tobacco stems enter a closed reaction bin, steam heating is adopted, ammonium sulfite or sodium sulfite and sodium hydroxide are added, EDTA and the ammonium sulfite or sodium sulfite and sodium hydroxide solution can dissolve fibrous adhesive lignin in the tobacco stems, and the tobacco stems can be used for producing green packaging materials after further mechanical treatment. Tobacco stem waste residues obtained after nicotine and pectic substance extraction are used as plant fiber paper pulp for producing the green packaging material, holocellulose in the tobacco stem residues is fully recycled and subjected to high-value resource utilization, the waste recycling value is increased, and the problem of waste environmental pollution is solved.

The invention discloses a filtering aid method for improving the filtering efficiency of monazite superior soluble slag, which comprises the following steps: step 1, carrying out solid-liquid separation on mixed slurry after alkali cake superior soluble callback to obtain filter residue 1 and filtrate 1; step 2, adding water into the filter residue 1, mixing and stirring according to a liquid-solid ratio of (1-2.5): 1 to react for 0.5-4 hours, and carrying out solid-liquid separation on ore pulp after the reaction to obtain a filter residue 2 and a filtrate 2; 3, if the ore pulp filtering speed in the step 2 is lower than 20 L / (m < 2 > * h) or the water content of obtained filter residues 2 is larger than 60%, the step 2 is repeated for the filter residues 2, the composite reducing agent with the preset mass is added, and stirring reaction is conducted for 2 hours till the water content of the filter residues is smaller than or equal to 60% or the ore pulp filtering speed in the plate and frame filtering process is larger than or equal to 20 L / (m < 2 > * h); in the step 3, the mass ratio of the added composite reducing agent to the original dry slag is (5-50) kg: 1t, and the composite reducing agent comprises sodium sulfite and thiourea in the mass ratio of (1-2): 1. The invention aims at shortening and improving the slag filtering performance so as to shorten the filtering time.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

The present invention relates to a method for removing organic pollutants in water by activating sulfite with Fe-N-C, belonging to the technical fields of new catalyst materials and environmental purification technologies. An iron salt and a carbon-nitrogen precursor are added to an organic solvent, and the iron salt and the carbon-nitrogen precursor form a complex. Then, the organic solvent is removed to obtain a dry powder. The dry powder is calcined under a protective atmosphere, and after carbonization, an Fe-N-C catalyst is obtained. The present invention solves the bottleneck problem of low efficiency in traditional heterogeneous sulfite activation technology due to few reactive sites and slow oxygen mass transfer by constructing carbon-based metal active sites with oxygen-rich properties. This catalytic oxidation method has high treatment efficiency and simple operation, has a wide pH application range, strong anti-ion interference ability, and high reusability, and has broad application prospects in the field of actual industrial wastewater treatment.

The invention belongs to the technical field of synthetic ester, and particularly relates to a preparation method of fatty acid pentaerythritol ester base oil, which comprises the following steps: carrying out esterification reaction on pentaerythritol and fatty acid in the presence of a catalyst and a color retention agent, and carrying out post-treatment to obtain the fatty acid pentaerythritol ester base oil, the catalyst comprises at least one of stannous octoate, stannous oxalate, stannous oxide, tetrabutyl titanate, isopropyl titanate and sodium hydrogen sulfate; the color retention agent comprises at least one of sodium hypophosphite, hypophosphorous acid, activated carbon and sodium sulfite. The color retention agent sodium hypophosphite is matched with the specific catalyst such as stannous oxalate, so that the petroleum color number of the produced fatty acid pentaerythritol ester base oil is smaller, and meanwhile, the esterification reaction time is shorter.

The invention relates to the technical field of water treatment agents, and particularly discloses an anti-corrosion deoxidizing composite agent for geothermal well recharge water and a preparation method of the anti-corrosion deoxidizing composite agent. The invention relates to an anti-corrosion and deoxidizing composite agent for geothermal well recharge water. The anti-corrosion and deoxidizing composite agent comprises the following raw materials: 30-40 parts of double modified sodium sulfite, 10-20 parts of a corrosion inhibitor, 8-15 parts of a scale inhibitor, 5-10 parts of amino trimethylene phosphonic acid, 5-10 parts of etidronic acid, 3-8 parts of polyethylene glycol monomethyl ether acrylate and 40-50 parts of deionized water. The dual-modified sodium sulfite is obtained by sequentially modifying sodium sulfite with a silane coupling agent and acrylic acid. The corrosion-resistant and oxygen-removing composite agent has the advantage of being high in oxygen-removing efficiency stability, the corrosion-resistant and scale-inhibiting functions are synchronously and synergistically improved on the basis that the oxygen-removing efficiency stability is guaranteed, and the complex working condition requirements of geothermal well recharge are completely met.

The disclosure herein relates to the innovative epinephrine formulations in aqueous solution of medicinal products that enhance the physicochemical stabilities of epinephrine and extend the product shelf life. In some instances, the formulations comprise epinephrine or a salt thereof, a complexing agent, and a “non-sulfite” antioxidant. The epinephrine formulations substantially demonstrated the superior physicochemical stabilities to conventional sulfite formulation of commercial medications currently available. In some instances, sulfite-free formulations further provide further benefit (e.g., safety benefits) to sulfite-sensitive patients. The compositions, methods for preparing the formulations, and methods of using the same (e.g., in the treatment of anaphylaxis) are also provided.

The utility model discloses an ethylene oxide absorption dealdehyding system in the field of dealdehyding, which comprises an ethylene oxide absorption tower, and the bottom of the ethylene oxide absorption tower is connected with a desalting delivery pump, a 20% sodium hydroxide solution metering pump and a dealdehyding buffer tank through pipelines. The dealdehyding buffer tank is further connected with a sodium hydrogen sulfite solution metering pump and a quenching stripping tower through pipelines, the top of the dealdehyding buffer tank is provided with a first EO re-absorption tower connecting pipe, the desalting delivery pump is connected with a cooler through a pipeline, the cooler is connected with an ethylene oxide absorption tower through a pipeline, and the ethylene oxide absorption tower is connected with a second EO re-absorption tower through a pipeline. And desalted water equipment is mounted on a pipeline between the cooler and the ethylene oxide absorption tower through a three-way valve. The dealdehyding resin is adopted for dealdehyding of the lean absorption water part, sodium sulfite is added to the quenching section of the EO absorption tower for dealdehyding, and then flash evaporation is performed, so that the content of aldehyde in the lean absorption water can be effectively reduced, and the content of aldehyde in an EO absorption system can be effectively reduced.

The invention relates to a method for efficiently and selectively extracting vanadium from vanadium shale. According to the technical scheme, the method comprises the steps that vanadium shale is crushed and ground, vanadium shale mineral powder is obtained, a sulfuric acid solution I and the vanadium shale mineral powder are mixed, mixed ore pulp is obtained, a leaching aid is added for pulp mixing, stirring and solid-liquid separation are conducted, and vanadium-containing leaching liquid and leaching residues are obtained; adding sodium sulfite into the vanadium-containing leaching solution, heating and stirring to obtain a reduced solution; adjusting the pH value of the reduced solution, and carrying out solid-liquid separation to obtain an extraction stock solution and neutralization slag; mixing the extraction organic phase and the extraction stock solution, performing countercurrent positive extraction, mixing the obtained loaded organic phase and a stripping agent, and performing countercurrent reverse extraction to obtain a vanadium-rich solution; adding sodium chlorate into the vanadium-rich solution, heating and stirring to obtain an oxidized solution, adjusting the pH value of the oxidized solution, and carrying out hydrothermal reaction and solid-liquid separation to obtain a vanadium precipitation mother solution and a vanadium precipitation intermediate product; and roasting the vanadium precipitation intermediate product to obtain vanadium pentoxide. The method is high in vanadium leaching rate, low in concentration of impurity iron in the extraction solution, short in extraction stage and high in product purity.

The invention discloses a preparation method of a plastic wood-based filtering material for removing micro-plastics in water, which comprises the following steps: taking natural wood, putting the wood into a treating fluid containing sodium hydroxide and sodium sulfite, treating, air-drying, immersing into water to obtain flexible wood, and collecting the treated fluid for later use; the flexible wood is placed in deionized water, EPTMAC and a sodium hydroxide solution are added, and then heating treatment is conducted to obtain modified wood; extracting lignin from the treated solution, dissolving the lignin and o-phenylenediamine in an acid solution for heating reaction, cooling, centrifuging, dialyzing supernate to obtain a solution containing carbon dots, and drying to obtain carbon dot powder; performing ultrasonic treatment on carbon dot powder, adding the carbon dot powder into absolute ethyl alcohol to obtain a carbon dot ethanol solution, uniformly dropwise adding the carbon dot ethanol solution onto the modified wood, and then drying the modified wood to obtain the plastic wood-based filter material. The plastic wood-based filtering material prepared by the preparation method has good hydrophilicity and plasticity, and can effectively adsorb micro-plastics.

The present invention belongs to the technical field of fabric color fixing agents and provides a novel acidic color fixing agent free of bisphenol S and a preparation method thereof; the acidic color fixing agent is composed of the following components in parts by weight: 15-25 parts of water, 10-15 parts of phenol, 15-25 parts of dimethylacetamide, 2-5 parts of sodium sulfite, 10-15 parts of acetic acid, 5-7 parts of concentrated sulfuric acid, 15-20 parts of acrylic acid, 2-5 parts of ethylene glycol dimethyl ether, and 1-3 parts of sorbitol; the preparation method comprises the following steps: mixing a formula amount of phenol, dimethylacetamide, acrylic acid, acetic acid, and sodium sulfite, heating, adding concentrated sulfuric acid to react, cooling, adding a formula amount of water, and adding a formula amount of ethylene glycol dimethyl ether and sorbitol to obtain the product. Compared with the prior art, the present invention does not contain bisphenol S, has a good color fixing effect, can effectively improve various fastnesses such as water fastness, perspiration fastness, and seawater resistance, has little effect on the color change of the fabric after treatment, and has good tolerance to hardness ions.

Described herein is anhydrous sodium thiosulfate, methods for synthesizing anhydrous sodium thiosulfate, pharmaceutical compositions thereof, and methods of treating ototoxicity. Anhydrous sodium thiosulfate is synthesized from sodium sulfite, sulfur, and cetylpyridinium chloride. The anhydrous sodium thiosulfate is formulated into a pharmaceutical composition comprising a buffer and solvent. These compositions are useful for eliminating or reducing ototoxicity in pediatric patients receiving platinum-based chemotherapeutics.

The invention discloses a preparation method of jade sugarcane juice, and relates to the technical field of food processing, the method comprises the following steps: S1, juicing and ozone sterilization; s2, adding a green color fixative for color protection treatment; s3, adding a clarifying agent; s4, performing non-thermal sterilization treatment; and S5, packaging and storing. The green color fixative is prepared from the following raw materials in percentage by weight: 10 to 20 percent of organic acid, 1 to 3 percent of green tea extract, 0.5 to 1 percent of apple polyphenol, 0.3 to 1 percent of sodium sulfite and the balance of water. The method can effectively sterilize and maintain the quality of the sugarcane juice, ensures that the original color, texture and flavor are not lost in long-time storage, and the prepared sugarcane juice is clear and bright in jade.

Methods and systems of PFAS destruction in water containing nitrate. The methods and systems include filtering water containing PFAS and nitrate through a membrane selective for PFAS to obtain a membrane reject containing PFAS and nitrate and a filtrate containing nitrate, forming a treatment solution using the membrane reject including diluting the membrane reject and combining the membrane reject with a photosensitizer, a sulfite salt, and a sufficient amount of base such that the treatment solution has a pH of about 10 or more, and irradiating the treatment solution with UV light in a photoreactor to destroy a portion of the PFAS. Before dilution, a concentration of PFAS in the membrane reject may be between about 3 times and about 20 times greater than before the filtering step. Dilution of the membrane reject may include between about a 3 and about a 20 times dilution.

The invention discloses a polyfunctional group synergistic reverse osmosis membrane and a preparation method thereof, and relates to the technical field of new materials and membrane separation. The polysulfone porous base membrane is sequentially soaked in a water phase monomer solution and an oil phase monomer solution, the polyamide reverse osmosis membrane is prepared through interfacial polymerization, sulfonic acid groups are introduced in the process, and water transfer channels are increased; soaking in an aminobenzene sulfonic acid aqueous solution, and introducing a benzenesulfonic acid group to improve the hydrophilicity of the reverse osmosis membrane; then treating with a sodium nitrite aqueous solution, and carrying out diazotization coupling reaction on the surface, so as to improve the crosslinking degree of the polyamide separation functional layer. The reverse osmosis membrane is cleaned by using a sodium sulfite aqueous solution, and an unreacted diazo group is replaced by a sulfurous acid group, so that the surface stability of the reverse osmosis membrane is improved. The preparation method provided by the invention is easy to control and simple in process, and the reverse osmosis membrane obtained by the preparation method has a synergistic effect of polyfunctional groups, so that the desalination rate and the water permeation flux of the reverse osmosis membrane are both improved, and the reverse osmosis membrane can be applied to the fields of purified water preparation, industrial sewage and wastewater deep treatment, seawater desalination and the like.

The invention relates to a treatment method of a high-COD (Chemical Oxygen Demand) hydroxylamine wastewater solution, and belongs to a wastewater treatment technology. According to the method, a mild treatment mode is adopted, the safe discharge standard can be met through combined and coordinated treatment of sodium hypochlorite, sodium sulfite and activated carbon, microorganisms can reach biodegradability through the treated wastewater, the purpose of turning waste into wealth is achieved, and the method is easy to operate and low in cost. The method is high in safety and can be used for industrial treatment.

The invention relates to a method for recycling lead by treating lead plaster of a waste lead-acid storage battery, and belongs to the technical field of lead secondary resource recycling. The method comprises the following steps: (1) slurrying lead paste with water to obtain slurry; adding sodium carbonate and sodium sulfite into the slurry, heating and then carrying out reduction-conversion reaction under a certain temperature condition to obtain a reaction mixture containing a lead-containing solid and a liquid phase; (2) carrying out solid-liquid separation on the reaction mixture obtained in the step (1) under the condition that the temperature is not lower than 40 DEG C to obtain a lead-containing solid; (3) drying the lead-containing solid obtained in the step (2) to obtain a dried lead-containing material; and (4) the dried lead-containing material obtained in the step (3) is subjected to high-temperature reduction smelting, and metal lead is obtained. According to the method, a wet process and a pyrogenic process are adopted, the used raw materials such as sodium carbonate, sodium sulfite and pea coal are cheap and easy to obtain, the whole technological process is short, operation is easy, the lead recovery rate is high, and industrial large-scale application and popularization are facilitated.