348 results about "Sulfite" patented technology

The invention relates to the technical field of oilfield chemistry, and discloses a graft modified cellulose filtrate reducer and a preparation method thereof.The preparation method comprises the following steps that modified hydroxyethyl cellulose, 2-acrylamide-2-methyl propane sulfonic acid, dimethyl diallyl ammonium chloride, alkenylated cardanol and N, N '-methylene bisacrylamide are added into deionized water, stirring is conducted, and a mixture is obtained; the preparation method comprises the following steps: adding cellulose into a reaction kettle, stirring for 10-15 minutes at the temperature of 40-60 DEG C at the speed of 300-400 rpm, dropwise adding ammonium persulfate and sodium hydrogen sulfite into a system, and continuously reacting for 4-6 hours to obtain the grafted modified cellulose filtrate reducer. The filtrate reducer disclosed by the invention has good high temperature resistance and salt resistance.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of ethylene sulfate and derivatives thereof, which comprises the following steps: S1, taking an aprotic solvent as a reaction solvent, adding urea peroxide, and stirring until the urea peroxide is dissolved; s2, dropwise adding ethylene sulfite or an ethylene sulfite derivative, stirring for reaction, and purifying to obtain ethylene sulfate or an ethylene sulfate derivative; the method has the advantages of reducing the catalyst cost and reducing the wastewater amount.

The invention discloses a high-efficiency purification process for removing COD (Chemical Oxygen Demand) of desulfurization wastewater by an electrocatalytic oxidation method, and relates to the technical field of environmental protection, and the high-efficiency purification process comprises the following steps: reducing initial COD of wastewater through sulfite oxidation pretreatment, removing heavy metal ions through heavy metal chemical precipitation, and degrading organic matters through electrocatalytic oxidation advanced treatment. Ozone is used for synergistically strengthening and realizing cyclic utilization of oxygen resources; according to the method, the current density of electrocatalytic oxidation is dynamically regulated and controlled, a matching section group is determined by constructing a current density-COD change curve, dividing sections and constructing a section matching model, then a current density group is constructed, a benefit stable value and an efficient judgment value are obtained through quantitative analysis, and the optimal current density is determined; and an electrode prediction model is constructed to predict the expected service life of the electrode by using a long-short-term memory network algorithm. The desulfurization wastewater OD can be efficiently purified, the current density is optimized, and the service life of the electrode is predicted.

The invention discloses a method for comprehensively treating zinc-containing sulfuric acid slag and blast furnace cloth bag ash, which comprises the following steps of: uniformly mixing the zinc-containing sulfuric acid slag, the blast furnace cloth bag ash, a calcium additive and a carbonaceous reducing agent according to the weight ratio of 10: (3-5): (2.5-4): (1.5-3); smoke dust generated by roasting is subjected to oxidation dust removal, cooling separation and desulfurization treatment, and zinc-containing oxide, sulfuric acid and sulfite are obtained; and cooling the roasted material with water, crushing and grinding, and sequentially carrying out high-intensity magnetic separation and low-intensity magnetic separation to obtain high-valued reduced iron powder. The final iron grade can reach 95% or above, and the content of sulfur and zinc is lower than 0.1%. According to the method, the industrial solid waste sulfuric acid slag and the blast furnace cloth bag ash can be converted into the high-valued reduced iron powder, comprehensive recycling of resources is achieved, and environmental and soil pollution caused by stacking is avoided.

To provide a composition for oil or gas well formation, and a method of producing the composition, and a method of forming an oil or gas well.SOLUTION: Provided is a composition for an oil or gas well formation, containing a viscoelastic surfactant and a modified nanomaterial. The modified nanomaterial optionally contains a nanocellulose. The modified nanomaterial optionally has, on its surface, a sulfate group, a sulfite group, a carboxy group, an ethylene oxide chain, an amino group, an ester group, a silane group, a tertiary ammonium group or a mixture thereof.SELECTED DRAWING: None

The invention discloses a method for preparing erythritol bicyclic ethylene sulfate through efficient catalysis, which comprises the following steps: reprocessing a commercially available titanium silicalite molecular sieve, and reacting intermediate erythritol bicyclic ethylene sulfite (BES) and hydrogen peroxide under the action of a self-made catalyst to obtain the target product erythritol bicyclic ethylene sulfate (BDTD), the yield is 88%; and the obtained product is recrystallized to obtain the product with the purity of more than 99.5%, and the solvent and the catalyst used in the process can be recycled. The raw materials and auxiliary materials are commercially available, low in price and easy to obtain, the reaction yield is high, the product purity is high, the process cost is low, and the method is environmentally friendly, suitable for industrialization and extremely high in social use value and application prospect.

The invention relates to the technical field of sewage treatment, in particular to a metal sulfide nanoparticle slow-release activator for sewage treatment and a preparation method of the metal sulfide nanoparticle slow-release activator for sewage treatment. The surface of the core layer is coated with the porous silicon dioxide membrane shell layer; the citric acid modifier is loaded on a core-shell interface; according to the invention, metal sulfide (such as FeS, MoS2, WS2 and the like) micro-nano particles are used as a solid-phase slow-release activator, so that the core problem of a traditional homogeneous activation system is radically solved. Firstly, the metal sulfide exists in the form of a solid phase and can directly contact and react with permanganate without an additional dissolving step, so that the problem of complicated process operation caused by poor solubility of activating agents such as sulfite is thoroughly avoided, and the process of reclaimed water treatment is simplified. The problem of poor continuous oxidation effect of a traditional homogeneous system is thoroughly solved.

The invention belongs to the technical field of fine chemical organic synthesis, and discloses a synthesis method of 1, 3-propane sultone without generation of three wastes. The synthesis method comprises the following steps: by taking allyl alcohol, sulfite and hydrosulfite as raw materials, generating 3-hydroxy propanesulfonate; then removing part of water, adding a solvent A to separate out sulfite, filtering, and adding sulfuric acid into filtrate for acidification; and adding a solvent B to separate out sulfate, filtering and separating out the sulfate, and adding a dehydrating agent to carry out dehydration cyclization reaction to prepare the 1, 3-propane sultone. According to the synthesis method provided by the invention, a 1, 3-propane sultone product with the yield not lower than 95% and the purity reaching 99.9% or above and a sulfate byproduct with the purity reaching 99.6% or above can be obtained; no waste gas, waste solid or waste water is generated in the reaction process, the catalyst sulfite can be repeatedly used, and the used solvent is easy to recover and can be repeatedly used.

The invention discloses a synthesis method of methyl 4-formylbutyrate, and belongs to the technical field of chemical synthesis, methyl acrylate and nitromethane are subjected to a Michael addition reaction under the action of a catalyst to prepare methyl 4-nitrobutyrate, and the excessive undissolved catalyst can be recycled after being filtered; the method comprises the following steps: under the action of sodium tert-butoxide and potassium permanganate, carrying out hydrolytic oxidation reaction on methyl 4-nitrobutyrate, adding a sodium hydrogen sulfite aqueous solution and a sulfuric acid solution after the reaction is completed, consuming excessive potassium permanganate oxidant, reducing by-products, and carrying out purification treatment to obtain high-purity methyl 4-formyl butyrate. The synthesis method provided by the invention has the advantages of cheap and easily available raw materials, simple operation, easily controllable conditions, high total yield and easy realization of industrial production.

The invention discloses a composition for improving the stability of 4-butylresorcinol, application of the composition and an external skin preparation, and belongs to the technical field of cosmetics. The composition is prepared from the following components in parts by weight: 0.01 to 5 parts of 4-butyl resorcinol, 0.005 to 0.195 part of sodium pyrosulfite, 0.005 to 0.195 part of sodium hydrogen sulfite, 0.005 to 3 parts of ergothioneine and 0.003 to 0.2 part of troxerutin. The composition can maintain the 4-butylresorcinol not to change color for a long time, and especially can maintain the original color under the conditions of ultraviolet irradiation and light irradiation for 3 months. The composition is used for preparing the external skin preparation, so that the external skin preparation also has better color stability, and the product quality of the external skin preparation is improved.

The invention discloses an intelligent monitoring system of a desulfurization absorption tower, which relates to the technical field of desulfurization absorption tower monitoring and comprises a data acquisition unit, an operation analysis unit, a desulfurization analysis unit, a comprehensive analysis unit and an abnormal alarm unit, through comprehensive evaluation of the pH value, chloride ion concentration and sulfite concentration of the slurry, desulfurization reaction effectiveness can be quantified, and dynamic adjustment of limestone dosage can be guided, so that desulfurization process parameters are optimized, the service life of the slurry is prolonged, and by fusing a stable operation index, a desulfurization reaction index and sulfur dioxide absorption data, the desulfurization efficiency is improved. The comprehensive absorption index model of the desulfurization absorption tower is constructed, global evaluation of the desulfurization efficiency is realized, the accuracy of the monitoring result is improved, the limitation of traditional single index evaluation is avoided through multi-factor correlation analysis, and finally, through the real-time early warning function of the abnormity alarm unit, the safety of the desulfurization absorption tower is improved. When the desulfurization system is unstable in operation or low in absorption efficiency, a worker can be quickly notified to intervene.

The present invention discloses a large-particle multi-level pore TS-1 molecular sieve for catalytic oxidation reaction in the field of molecular sieve catalytic materials, and its preparation method and use. When preparing the TS-1 molecular sieve, a silicon source, a titanium source, a template, a seed crystal and water are used to form a mixed dispersion, and a one-step hydrothermal crystallization is adopted. After filtering, washing, drying and roasting, a large-particle multi-level pore TS-1 molecular sieve is obtained. The molecular sieve has a cross-shaped long strip, a particle size of 6 to 10 μm, and a specific surface area of ​​≥370 m 2 / g, pore volume ≥0.4ml / g, average pore size 2-3nm. The present invention provides a large-particle multi-level pore TS-1 molecular sieve with excellent catalytic activity and stability, which can be used in the reaction of oxidizing vinyl sulfite to vinyl sulfate using dichloromethane as solvent and hydrogen peroxide as oxidant, has a long service life, is easy to recycle, has good product selectivity and high conversion rate.

The invention discloses a method for high-selectivity synthesis of ethylene sulfate from ethylene sulfite. An organosilane functional group is introduced to the surface of a TS-1 molecular sieve, the hydrophilic and hydrophobic degree of TS-1 is regulated and controlled, water is effectively prevented from being enriched around TS-1, and DTD hydrolysis side reaction is reduced, so that the stability and oxidation performance of the catalyst are improved, and the dispersity of TS-1 in a system is improved. The TS-1 treated by octadecyl trichlorosilane has moderate-strength hydrophobicity, so that the adsorption of substrates ES and H2O2 on the surface of the catalyst can be ensured, the aggregation of H2O molecules on the surface can be reduced, and the hydrolysis of DTD on the surface of the catalyst is inhibited. When the modified TS-1 molecular sieve catalyzes an ES oxidation reaction, DTD selectivity can reach 95% or above, and the modified TS-1 molecular sieve has good stability and reusability. The method is simple to operate, low in cost and suitable for large-scale industrial production.

The invention belongs to the technical field of scale inhibitors, and particularly relates to a slow-release scale inhibitor and a preparation method thereof.The preparation method comprises the steps that 3, 4, 5-allyl trihydroxybenzoate, itaconic acid, sodium hydrogen sulfite, methacryloyloxyethyl-n-hexadecyl-dimethyl ammonium bromide and deionized water are mixed, after water bath heating, an ammonium persulfate aqueous solution is slowly added, and the scale inhibitor is obtained after reaction; the preparation method comprises the following steps: dissolving agar in deionized water, adding polyethylene glycol modified sodium alginate and a scale inhibitor into the deionized water, stirring, dropwise adding into edible oil to obtain gel microspheres, adding the gel microspheres into a calcium chloride aqueous solution, slowly stirring, cross-linking, cleaning and drying to obtain the slow-release scale inhibitor. The hydrogel microspheres swell to slowly release the scale inhibitor, meanwhile, the released scale inhibitor is hydrolyzed in water, ester groups are slowly broken, polycarboxylic acid, 3, 4, 5-trihydroxybenzoic acid and hydroxyethyl-n-hexadecyl-dimethyl ammonium bromide are slowly released, and good scale inhibition and corrosion inhibition effects are achieved.

The invention provides a method for preparing high-purity acrylate by removing trace impurity aldehyde, which comprises the following steps: mixing crude acrylate with a polymerization inhibitor to form an organic phase; adding an aqueous solution of a dealdehyding agent into the organic phase to form an oil-water two-phase system; the oil-water two-phase system is forcibly stirred for 0.1-2.0 hours at the temperature of 20-40 DEG C, so that the impurity aldehyde and the dealdehyding agent are subjected to nucleophilic addition reaction, and a generated aldehyde-dealdehyding agent addition product is dissolved in a water phase; standing and layering the reacted material, separating and removing a water phase to obtain an organic phase without impurities; carrying out reduced pressure rectification on the organic phase after impurity removal to obtain a high-purity acrylate product with the total aldehyde content lower than 50ppm; wherein the aldehyde removing agent is sodium hydrogen sulfite, potassium hydrogen sulfite, calcium hydrogen sulfite, ammonium hydrogen sulfite or a mixture of any two or more of the sodium hydrogen sulfite, the potassium hydrogen sulfite, the calcium hydrogen sulfite and the ammonium hydrogen sulfite. The method is efficient, economical, free of solid deposition and easy for industrial continuous operation.

The present application relates to the technical field of batteries. Disclosed are a non-aqueous electrolyte solution and a secondary battery. The non-aqueous electrolyte solution includes a bicyclic sulfate compound and a bicyclic sulfite compound; and a content of the bicyclic sulfite compound in the non-aqueous electrolyte solution is 1 ppm to 500 ppm, based on a total mass of the non-aqueous electrolyte solution.

The invention provides a reverse osmosis optimal dosing system and method based on ultraviolet sterilization, and the method comprises the following steps: firstly, the system monitors the influent microorganism load and water quality in real time, dynamically calculates the required ultraviolet dosage, and precisely adjusts the power of an ultraviolet sterilizer; secondly, according to the residual microorganism risk and the water inlet flow after ultraviolet treatment, the feeding amount of an oxidizing bactericide (such as sodium hypochlorite) is accurately adjusted according to a PID control strategy combining feedforward and feedback; meanwhile, according to the oxidation-reduction potential of the sterilized water body, a reducing agent (such as sodium hydrogen sulfite) is intelligently added to protect the reverse osmosis membrane. And finally, efficient cooperation of ultraviolet physical sterilization and chemical sterilization is achieved, on the premise that strict control over microbial pollution is guaranteed, the consumption and operation cost of chemical agents are remarkably reduced, generation of by-products is reduced, the service life of a reverse osmosis membrane is prolonged, and the intelligent level of system operation and the overall economic benefits are improved.

The invention relates to a method for removing heavy metal complexes in wastewater, which comprises the following steps: S1, preparing a PMS composite agent which is prepared by ball-milling the following raw materials in percentage by weight: 50-90% of persulfate, 5-30% of sulfite and 5-20% of pypocholoride; s2, the PMS composite agent obtained in the S1 is added into industrial wastewater containing a heavy metal complex, heavy metal in the heavy metal complex is Cu and one or more of Co, Cr, Ni, Pb and Zn, complex in the heavy metal complex is one or more of EDTA, NTA, citric acid, oxalic acid, tartaric acid and sorbic acid, the mixture is stirred and dissolved, alkali liquor is added to maintain the pH of the industrial wastewater to be 9.5-11.0, and the PMS composite agent is obtained after the reaction is completed. Carrying out Fenton-like oxidation complex breaking reaction, and carrying out post-treatment after the reaction is finished, so as to obtain the reclaimed water. According to the method, the purpose of removing the heavy metal complex in the wastewater by the in-situ activation of the persulfate is achieved under the condition of not additionally adding a catalyst or applying energy sources such as electricity, ultraviolet and the like.

The invention belongs to the technical field of refractory materials, and discloses a method for preparing a refractory raw material by utilizing harmless treatment of secondary aluminum ash, which comprises the following steps: selecting hazardous solid waste secondary aluminum ash rich in potassium, sodium, fluorine, chlorine and other harmful substances as a treatment object, grinding, sieving, mixing with sulfite paper pulp waste liquid, and pressing into a porous honeycomb aluminum ash standard brick. Preparing a refractory raw material through the processes of normal-temperature maintenance, heat treatment in a high-temperature nitrogen environment and the like; the technological process is simple, and during high-temperature heat treatment, fluorine, chlorine, potassium, sodium and other alkali ions contained in the aluminum ash are volatilized under the high-temperature driving effect; under the protection of nitrogen atmosphere, the binding capacity between alkali ions such as potassium and sodium and silicon oxide and aluminum oxide in the aluminum ash during volatilization is reduced, and the alkali ions are promoted to effectively escape, so that the alkali removal effect is achieved, and a harmless refractory raw material is obtained; the method is low in production cost, high in aluminum ash treatment efficiency, high in dealkalization rate and good in effect, secondary pollution caused in the aluminum ash treatment process is avoided, and the resource utilization level is improved.

The invention relates to a preparation method and application of an ethylene sulfite compound, and the preparation method comprises the step of reacting an epoxy compound with sulfur dioxide under the action of an immobilized organic base catalyst to obtain the ethylene sulfite compound. The immobilized organic base catalyst is formed by connecting organic base and chloromethylated resin through chemical bonds, and has good catalytic activity and chemical stability. According to the preparation method provided by the invention, the raw material cost is low, the product is easy to purify, the yield is relatively high, continuous automatic production is easy to realize, and the prepared ethylene sulfite compound is added into the lithium battery electrolyte as an additive, so that the electrochemical window of an electrolyte system can be widened, and the high-voltage interface stability and the cycle performance of the battery can be improved.

The invention belongs to the technical field of biological detection, and particularly relates to a bisulfite-free detection kit for specific site 5-methylcytosine and a detection method thereof. According to the method, a TAPbeta treatment method is adopted, 5hmC is sealed through beta-GT, 5mC oxidation is carried out through TET, and 5mC is reduced into dihydrouracil (DHU) through pyridine borane, so that the apparent difference between 5mC and C and 5hmC is converted into single nucleotide polymorphism difference. In addition, a flow microsphere technology based on PNA-assisted click chemical connection starting is established to detect DNA methylation specific sites. A PNA clip is innovatively introduced into click chemical connection, and non-specific connection is inhibited. Target sequence enrichment, signal amplification and signal acquisition are carried out through surface-functionalized magnetic nanoparticles, and the detection sensitivity is improved to fM. The invention provides a new tool for high-specificity and high-sensitivity epigenetic marker detection.

The present application relates to a kind of catalyst for preparing ethylene sulfite, the preparation method of ethylene sulfite, the catalyst includes organic aluminum compound and amine, the molar ratio of the organic aluminum compound and the amine is 1-5:1.The preparation method of ethylene sulfite includes the reaction of contacting ethylene oxide with sulfur dioxide in the presence of the catalyst.The quaternary ammonium salt in the catalyst of the present application and trialkylaluminum are excited by phase transfer and coordination, etc.Effect, monomer ring-opening of ethylene oxide, promote SO2 and ethylene oxide to react to generate ethylene sulfite, and then high-purity ethylene sulfite is prepared with high yield.

The invention provides a reverse osmosis reducing agent and a preparation method and application thereof, and belongs to the technical field of reverse osmosis water treatment.The reverse osmosis reducing agent comprises a first reducing agent, a second reducing agent and a solvent; the first reducing agent is thiosulfate, and the second reducing agent is sulfite and / or bisulfite; the mass ratio of the first reducing agent to the second reducing agent is (1: 18)-(10: 1). The reverse osmosis reducing agent can be applied to reverse osmosis water treatment, the reverse osmosis reducing agent is added into reverse osmosis inlet water to be treated, and the reverse osmosis inlet water subjected to reduction treatment can be obtained after full reaction. The first reducing agent and the second reducing agent are compounded according to the specific mass ratio, so that the compounded reverse osmosis reducing agent can effectively inhibit the occurrence of advanced oxidation chain reaction while keeping high reducibility, and effective reduction of reverse osmosis inlet water can be realized by using a small amount of the reverse osmosis reducing agent.

The invention relates to the technical field of chemical synthesis, in particular to a preparation method of 2-sulfydryl-6-chlorobenzoic acid, which comprises the following steps: dissolving chlorobenzoic acid in dimethyl sulfoxide, adding sodium hydrogen sulfite, and stirring at room temperature; the preparation method comprises the following steps: dissolving mercaptobenzoate in dimethyl sulfoxide, adding sodium carbonate and dimethylamino, and reacting at high temperature; cooling to room temperature, and adjusting the pH value to be neutral by using dilute acid; adding into diethyl ether, uniformly mixing, adding into dilute acid, and standing for layering to obtain 2-sulfydryl-6-chlorobenzoic acid; the preparation method of the chlorobenzoic acid comprises the following steps: mixing parachlorotoluene with water, adding a supported catalyst, stirring and heating; after the temperature rises to 80 DEG C, adding potassium permanganate in batches for reaction; and filtering, adjusting the pH value to be acidic by using dilute acid, and then carrying out suction filtration and drying to obtain the chlorobenzoic acid. According to the preparation method disclosed by the invention, chlorobenzoic acid and mercaptobenzoate are subjected to a reaction to obtain 2-mercapto-6-chlorobenzoic acid with high yield; the method has the characteristics of simplified operation, energy consumption reduction, shortened production period and low production cost.

The invention relates to the technical field of wastewater treatment, in particular to an advanced treatment process for fluorine, mercury and chromium in electronic wastewater. The deep purification of fluorine, mercury and chromium is realized through the pretreatment of nano zero-valent iron and sodium hydrogen sulfite and the combined action of Sorel cement, sulfenyl functional activated carbon, FeSO and nano TiO2 and ultraviolet light. The F <-> adsorption capacity is increased to 50mg / g by the modified alumina and the three-dimensional zeolite, and the concentration of F <-> is ensured to be less than or equal to 10mg / L by combining CaF2 precipitation; the sulfur-based functionalized activated carbon directionally adsorbs Hg < 2 + > through-SH groups, and complexed chromium is degraded by combining photocatalysis, so that the residual Hg < 2 + > is less than or equal to 0.001 mg / L, the total chromium is less than or equal to 1.5 mg / L, and the emission standard is comprehensively met.

The present application relates to a kind of methods for removing heavy metal complex in wastewater, comprising the following steps, S1 configuration PMS composite reagent, the PMS composite reagent is made by including the following weight percentage of raw material ball milling, persulfate 50~90%, sulfite 5~30%, hypochlorite 5~20%;S2 in the heavy metal complex-containing industrial wastewater join the PMS composite reagent obtained in the S1, heavy metal in heavy metal complex is Cu, and one or several of Co, Cr, Ni, Pb and Zn, complex in heavy metal complex is one or several of EDTA, NTA, citric acid, oxalic acid, tartaric acid, sorbic acid, stirring is dissolved, and lye is added to maintain the pH of industrial wastewater to 9.5~11.0, and carries out fenton-like oxidation and breaks the complex reaction, after reaction, aftertreatment is obtained, and the regenerated water is obtained.The present application achieves the purpose of removing heavy metal complex in wastewater by the method of in-situ activation of persulfate without additional catalyst or the application of electricity, ultraviolet and other energy.

The present application specifically relates to the technical field of solid waste treatment. Disclosed is a method for preparing baking soda by using desulfurized fly ash. The method comprises: dissolution, coagulation-defluorination coupled precipitation defluorination, oxidative acidification, cooling crystallization, preparation of baking soda from sodium sulfate, reverse precipitation and preparation of baking soda from sodium chloride. In the present application, the industrial desulfurized fly ash is prepared into baking soda having a high added value by using an effective process, and the baking soda is reused in a desulfurization process, thereby achieving resource recycling of the industrial desulfurized fly ash. In addition, impurity ion COD, sulfite, carbonate, bicarbonate and fluorine ions, etc., in the desulfurized fly ash are comprehensively removed; and compared with a traditional process, the recycled baking soda has a higher purity and a higher recovery rate by means of process innovation.

The present invention discloses a BODIPY-based ratiometric fluorescent probe for detecting sulfite, its preparation method, and application. The fluorescent probe is 2,8-bis(2-(benzothiazol-2-yl)-2-cyanovinyl)-10-(furan-2-yl)-1,3,7,9-tetramethyl-5H-dipyrroledifluoroborane complex. The present invention utilizes 2,8-diformyl-10-(furan-2-yl)-1,3,7,9-tetramethyl-dipyrroledifluoroborane as a raw material, and carries out a condensation reaction with 2-(benzothiazol-2-yl)acetonitrile to obtain the compound 2,8-bis(2-(benzothiazol-2-yl)-2-cyanovinyl)-10-(furan-2-yl)-1,3,7,9-tetramethyl-5H-dipyrroledifluoroborane complex (abbreviated as BODIPY-DBC). When a solution of the compound BODIPY‑DBC reacts with sulfite, the solution changes color from purple to yellow under sunlight; under ultraviolet light at a wavelength of 365 nm, the solution's fluorescence changes from orange to green. BODIPY‑DBC can sensitively detect sulfite content in solutions, with high sensitivity (detection limit of 33.12 nM), fast response, good selectivity, and a wide detection range. It holds great promise as a fluorescent probe for sulfite detection.

The invention relates to the technical field of sewage treatment, in particular to a biological enzyme-containing deodorizing and antibacterial composition for sewage treatment. The biological enzyme-containing deodorizing and antibacterial composition for sewage treatment is prepared from the following raw materials in parts by mass: 1 to 3 parts of a compound biological enzyme preparation, 5 to 15 parts of bamboo charcoal powder, 1 to 2 parts of chitosan, 1 to 3 parts of dopamine, 0.005 to 0.024 part of glutaraldehyde, 10 to 30 parts of bentonite, 1 to 5 parts of graphene, 1 to 3 parts of nano silicon dioxide, 10 to 20 parts of wood flour, 5 to 10 parts of sodium hydrogen sulfite and 1 to 5 parts of sodium carboxymethyl cellulose. 1-2 parts of polyacrylamide and 1-5 parts of a nonionic surfactant. The composition disclosed by the invention forms a synergistic effect, can remove most suspended matters and metal ions in sewage, can quickly catalyze and decompose organic matters into water-soluble small molecular compounds such as organic acid and alcohol, efficiently and remarkably reduces the contents of nitrogen and phosphorus in the sewage and purifies a water body.

The invention provides an environment-friendly low-chlorine wet strength agent and a preparation method and application thereof.The preparation method comprises the steps that adipic acid and tetraethylenepentamine are mixed and react for 2-6 h at the temperature of 170-190 DEG C, and a prepolymer is obtained; cooling the prepolymer to 120-140 DEG C, adding a modifier, carrying out a heat preservation reaction for 2-3 h, and adding deionized water to adjust the solid content to 55-65% so as to obtain a modified polyamide solution; adding a cationizing agent and epoxy chloropropane into the modified polyamide solution, heating to 65-75 DEG C, reacting, and adding acid to adjust the pH value to 2.5-4.5 when the viscosity of the system reaches 50-80 mPa.s; adding sodium hydrogen sulfite, and carrying out heat preservation reaction for 1-2 hours; and adding deionized water to adjust the solid content to 12-13%, thereby obtaining the environment-friendly low-chlorine wet strength agent. The specific modifier is adopted to modify a polyamide main chain, and the cationizing agent is introduced, so that the prepared wet strength agent not only can remarkably reduce the content of organic chlorine in a product, but also can improve the dry and wet strength, water resistance and folding resistance of paper. In addition, the product can also shorten the curing time of the paper.