59results about How to "Wide range of pH adaptation" patented technology

The invention relates to a method for preenriching and separating lithium and boron from salt lake brine by liquid-liquid-liquid three-phase extraction, which comprises the following steps: adding water-soluble auxiliary extractant into a salt lake concentrated brine solution, regulating the pH value of the brine, adding water-soluble high molecular polymer, and thoroughly mixing at room temperature to obtain an upper / lower two-layer liquid-phase system; adding organic extractant, and mixing to obtain an upper / middle / lower three-layer liquid-phase system; and taking the upper and middle phases from the three-liquid-phase system, and respectively recovering lithium and boron in the upper and middle phases by back washing. The invention can simultaneously enrich and extract lithium and boron by one-step extraction from high-magnesium / lithium-ratio salt lake brine, and can separate the lithium and boron from abundant coexistent ions of magnesium, calcium and other impurity metals in the brine. The lithium and boron are respectively selectively enriched from the upper and middle phases in the three-liquid-phase system to implement primary separation, thereby facilitating the subsequent purification and refinement. The three-liquid-phase extraction can be carried out under neutral or weakly-acidic conditions, and has strong adaptability.

The invention provides a preparation method of a wetland plant and pig manure composite biochar, and an application of the composite biochar in the adsorption of heavy metals in water. Typical wetlandplants of Poyang Lake are selected, the aerial parts of the wetland plants are harvested in the growing season, pig manure is obtained from a pig farm, the collected wetland plant biomass is washed with water, dried and crushed, the pig manure is dried and crushed sequentially, and the plant biomass and pig manure biomass are mixed according to a ratio 1:1 to form a mixed biomass; chitosan and alkali residues are dried, and are crushed and mixed according to a mass ratio of 1:1; the mixed biomass and the obtained chitosan and alkali residue powder are mixed according to a ratio of 10:1 to prepare a composite biomass; and the composite biomass is added to an iron solution, anaerobic hydrothermal carbonization is carried out to form the composite biochar, and the composite biochar is used for adsorbing heavy metals in water. The preparation method fully utilizes several typical wastes in the Poyang Lake basin, achieves the purpose of treating pollution with wastes, and also has the advantages of wide sources of raw materials, low cost, simplicity, and easiness in operation, and the prepared biochar adsorbent is nontoxic and harmless, and is friendly to the environment.

The invention relates to an anti-capsaicin substance general specific antibody, a test paper strip and a kitchen waste oil immunochromatographic rapid discriminating method. The anti-capsaicin substance general specific antibody is obtained through immunizing animals with a capsaicin substance general artificial immunization antigen compound represented by formula I, separating and purifying, and freeze-drying. The kitchen waste oil immunochromatographic immune test paper strip made from the anti-capsaicin substance general specific antibody can be used for rapidly detecting the total amount of capsaicin substances in kitchen waste oil, and has the advantages of high detection sensitivity, wide pH adaptation range, one-step operation, and high simplicity and convenience. No capsaicin substance standard solutions are used as positive control substances.

Provided is a method for catalyzing alkylated waste sulfuric acid through lignocellulose ester. The method comprises the steps that the alkylated waste sulfuric acid is added to metallic oxide or hydroxide to react till the pH value is weak acidic, then catalyst lignocellulose ester and an oxidizing agent are added for a redox reaction, and organic matter in the alkylated waste sulfuric acid is converted into CO2, H2O, N2 and other harmless micromolecular matter. Obtained reaction liquid generated after oxydative degradation and decoloration is refined to be prepared into inorganic salt. Selected lignocellulose ester has a catalyzing function, and has the functions of activating the oxidizing agent and achieving adsorption decoloration. Other impurities are not introduced in the production process, secondary pollution cannot be caused, the organic matter in the waste acid is oxidized to be degraded, all mother liquor is cyclically utilized, and product quality cannot be influenced, and reaches the quality standard of the feed grade and the industrial grade. The production process is easy to operate, safe and reliable, operation is carried out at normal pressure, and investment is reduced. The lignocellulose ester catalyst can be biodegraded, and can serve as a raw material of biofertilizer, and no three wastes are discharged in the production process.

The invention provides a preparation of dendrobium small molecule peptides and dendrobium small molecule peptides obtained therefrom. The preparation method comprises the following steps: 1) pretreatment; 2) extraction; 3) enzymolysis; 4) separation and purification; and 5) concentration and drying. The enzymolysis time is shortened to 2-3h by way of compound biological enzyme digestion on xylanase, cellulase, alkaline protease and plant protease. The pH value needs not to be adjusted during enzymolysis, so that the process time is shortened, and meanwhile, the desalting process is canceled, and the production efficiency of the dendrobium small molecule peptide is increased. The molecular weight of the dendrobium small molecule peptides obtained by the preparation method is primarily at 100-500Da, so that the dendrobium small molecule peptides are easily absorbed by a human body and can be applied to the field of food.

The invention discloses a method and a device for extracting boron from saline brine by using air-floatation polymers. The method comprises the following steps: saline brine is filled in an air floatation extraction column, air are bubbled inside from the lower end of the air floatation extraction column, a water-soluble polymer aqueous solution is added from a U-shaped draft tube on the side wall of the air floatation extraction column, the polymer aqueous solution is mixed with overflow saline brine in the U-shaped draft tube, the mixed solution is sprayed into the air floatation extraction column via a feeding ring, bubbles generated above the air floatation extraction column are collected through a scraping plate, and boron in the bubbles is recovered by back extraction. The method is completed by using the air floatation extraction column which comprises a hollow cylinder, an air inlet, an air distributor, the feeding ring, the U-shaped draft tube positioned on the outer wall outside the hollow cylinder, a water-soluble polymer aqueous solution inlet and the bubble scraping plate; according to the method and the device, polymer molecule micro-aggregates formed by the water-soluble polymer in the saline brine are utilized to trap boron, the vanadium-contained polymer molecule micro-aggregates are trapped by air floatation, and the method and the device are suitable for extracting vanadium from various saline brines.

The invention discloses preparation and application of a hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst, and belongs to the technical field of water treatment catalysis.The preparation process of the heterogeneous catalyst comprises the following steps: taking Fenton sludge as a raw material, mixing the raw material with biochemical sludge, then carrying out co-pyrolysis to obtain low valent iron biochar; and constructing pores with different sizes in the low valent iron biochar by utilizing a steam explosion method so as to obtain the hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst. The heterogeneous catalyst is used for replacing homogeneous Fe<2+> to realize efficient degradation of organic pollutants in wastewater. The heterogeneous catalyst has the advantages of wide pH value application range, high catalytic efficiency and strong stability. The heterogeneous catalyst has the advantages that the reduction treatment and resource utilization of dangerous solid waste namely Fenton sludge can be realized, the cost of exogenous iron and the subsequent treatment cost of Fenton sludge can be saved, and the heterogeneous catalyst has a wide prospect in organic wastewater treatment.

The invention discloses a porous integral medium and a preparation method and application thereof. The invention provides the porous integral medium with a nanometer line cage construction, wherein the porous integral medium consists of a nanometer line network framework and micron-order through holes, the size of the network framework is between 50 and 500nm, and the aperture of each micron-order through hole is between 1 and 100mu m. The porosity of the porous integral medium is between 60 and 95 percent. The porous integral medium which has the very regular nanometer line network framework and internal pores arranged orderly has excellent properties of high porosity, larger specific surface area, controllable aperture size, etc. The excellent properties enable the medium to be characterized by low resistance, high efficiency, high flux, etc. while the characteristics of excellent biocompatibility, wide pH accommodation range, etc. brought by the draw material enlarge the application range of the medium.

The invention discloses a composite cathode and a preparation method thereof as well as application of the composite cathode in a biological electro-Fenton method, and belongs to the fields of preparation of environmental electrochemical materials and wastewater treatment by an advanced oxidation technology. The method comprises the following steps: soaking a clean carbon felt subjected to surfaceoxidation modification into a mixed salt solution of iron, manganese and cobalt; then adding a reducing agent and reducing the surface of the carbon felt to obtain nanoparticles, namely the compositecathode; the molar ratio of the iron to the manganese to the cobalt in the mixed salt solution is (1-4):1:1. The preparation method disclosed by the invention is simple; the obtained electrode has good recycling performance; the constructed bio-electric Fenton system has wide pH adaptation range and can significantly improve the degradation rate of syringic acid.

The invention discloses a preparation method of a graphite felt loaded metal organic framework compound cathode material and an application thereof. The method comprises the following steps: employingferric salt, Pluronic F127, weak acid, 2-aminoterephthalic acid and a carbon felt, adding ferric salt and Pluronic F127 into deionized water; stirring, then adding the weak acid and the 2-aminoterephthalic acid according to the molar ratio, stirring to obtain a metal organic framework compound precursor solution, putting the metal organic framework compound precursor solution and the pretreated carbon felt into a reaction kettle together, sealing, then carrying out a hydrothermal reaction, washing and carrying out vacuum drying to obtain the cathode material. The cathode material has a porousstructure and a large specific surface area, and the yield of H2O2 is remarkably increased when the cathode material is applied to an electro-Fenton system. The oxygen is not required to be filled, aeration is performed or a Fenton reaction reagent is not required to be added in the reaction process, so that the method has a relatively wide pH application range and relatively high acid stability,and almost no iron-based sludge is generated.

The invention discloses a phosphorus removal agent for municipal domestic sewage. The phosphorus removal agent comprises, by weight, 20-70% of polyaluminium sulfate, 20-70% of polyferric sulfate, 0.1-5% of calcium sulfate and 0.1-5% of magnesium oxide. The phosphorus removal agent has the advantages that the efficient phosphorus removal agent for the municipal domestic sewage is prepared from safe and non-toxic raw materials, is environmentally friendly, is non-toxic and is free of chlorine ions or secondary pollution; the phosphorus removal agent is excellent in cost performance; the various raw materials are easily available, production procedures are simple, and waste such as wastewater, waste gas and waste solids can be prevented; the phosphorus removal agent for the sewage is wide in pH (potential of hydrogen) application range and can be used for the sewage with pH values in the ranges of 3-11; the phosphorus removal agent has diversified functions such as phosphorus, ammonia nitrogen, COD (chemical oxygen demand), SS (suspended substances) and heavy metal removal functions and flocculation functions; the phosphorus removal agent is applicable to treating the municipal domestic sewage with the original water total phosphorus concentration of 1-5 mg / L; obvious effects of treating the sewage can be realized, and the total phosphorus concentration can be reduced and is lower than 0.4 mg / L by the aid of 10-200 ppm of phosphorus removal agent; the phosphorus removal treatment cost for the municipal domestic sewage is only 0.05-0.08 yuan / ton, and accordingly the sewage treatment cost can be effectively reduced.

The invention relates to a method for preenriching and separating lithium and boron from salt lake brine by liquid-liquid-liquid three-phase extraction, which comprises the following steps: adding water-soluble auxiliary extractant into a salt lake concentrated brine solution, regulating the pH value of the brine, adding water-soluble high molecular polymer, and thoroughly mixing at room temperature to obtain an upper / lower two-layer liquid-phase system; adding organic extractant, and mixing to obtain an upper / middle / lower three-layer liquid-phase system; and taking the upper and middle phases from the three-liquid-phase system, and respectively recovering lithium and boron in the upper and middle phases by back washing. The invention can simultaneously enrich and extract lithium and boron by one-step extraction from high-magnesium / lithium-ratio salt lake brine, and can separate the lithium and boron from abundant coexistent ions of magnesium, calcium and other impurity metals in the brine. The lithium and boron are respectively selectively enriched from the upper and middle phases in the three-liquid-phase system to implement primary separation, thereby facilitating the subsequent purification and refinement. The three-liquid-phase extraction can be carried out under neutral or weakly-acidic conditions, and has strong adaptability.

The invention discloses a transglutaminase mutant expressed in an active form, belonging to the fields of enzyme engineering and fermentation engineering. According to the technical scheme disclosed by the invention, site-directed mutation is carried out on a mature region of transglutaminase, so that amino acid residues near the active site of the transglutaminase are changed, the catalytic efficiency of transglutaminase is improved, and recombinant bacterium hpro-E300W with the enzyme activity of the transglutaminase further improved is obtained. The fermentation enzyme activity of a recombinant bacterium hpro-E300W fermentation tank can reach 59.85U / mL, which is the maximal value of the currently reported fermentation level. In addition, by inserting yarrowia lipolytica endogenous proteinase Kex2 recognition sites in transglutaminase, the active expression of the transglutaminase in the yarrowia lipolytica is embodied. During the fermentation production, little impure protein is generated, the purification is simple, and the cost of industrial production of transglutaminase can be reduced.

The invention discloses a yellow disperse dye with excellent washing fastness, rubbing fastness, light fastness and saliva resistant fastness, and a preparation method and use thereof. The dye is wide in pH applicable range, good in compound compatibility of C.I. disperse red 60 and C.I. disperse blue 56, and especially suitable for dyeing of polyester / cotton blended fabrics.

The invention relates to preparation and application of high-activation charcoal based on heat and cobalt complex modification, and belongs to the technical field of environmental materials. The material is prepared by the following steps: calcining biomass sieved by a 160-mesh sieve in a carbon dioxide atmosphere, washing with hydrochloric acid, and drying; ultrasonically complexing cobalt acetate and 1,10-phenanthroline in an ethanol solvent, adding charcoal, stirring and evaporating to obtain a compound, and drying the compound in a drying oven; grinding the dried solid into powder, calcining for 2 hours at the temperature of 600 DEG C in an argon atmosphere, and introducing inert gas for storage, so as to obtain the heat and cobalt complex modified high-activation charcoal. The material activates peroxymonosulfate at a low dosage, so that the antibiotic sulfamethoxazole can be completely degraded in a short time, and the material shows high activation in a wide pH range, different salt concentrations and water bodies. The preparation method of the novel material is simple, the raw materials are cheap and easy to obtain, and the novel material is suitable for industrial preparation, has high activation on peroxymonosulfate, and has a wide application prospect in actual organic wastewater treatment.

The invention discloses bacillus subtilis for producing D-psicose as well as a culture method and application of the bacillus subtilis, the number of the bacillus subtilis is blb-12-B, the bacillus subtilis is preserved in the China General Microbiological Culture Collection Center (CGMCC) on December 8, 2021, and the preservation number is CGMCC No.24054. The invention further discloses a preparation method of the bacillus subtilis for producing D-psicose. The enzyme activity of D-psicose3-epimerase in the fermentation liquor of the bacillus subtilis obtained through separation is larger than or equal to 550 U / ml, the enzyme conversion efficiency is greatly improved, the production cost is remarkably reduced, when the pH value of the enzyme obtained through fermentation is 5.5-7.5, the enzyme activity is higher than 85%, the pH application range is wide, the color value and the conductivity of feed liquid can be reduced, the post-purification process of products is better facilitated, and the method is suitable for industrial production. The production efficiency of the product is improved, the production cost of the D-psicose is remarkably reduced, and industrial production control is facilitated.

The invention discloses a method for extracting superoxide dismutase from the blood of a mammal, belonging to the technical field of food processing. The method is used to solve the problems of high cost, low benefit and low purity in extracting superoxide dismutase from the blood of the mammal. The method for extracting superoxide dismutase from the blood of the mammal comprises the following steps of: (a) collection of the blood of the mammal; (b) hemolysis; (c) thermal denaturation in the presence of copper salt; (d)ultrafiltration; (e) precipitation of acetone and recovery of acetone with a rotary evaporator; (f)column chromatography; and (g)freeze-drying. The method for extracting superoxide dismutase from the blood of the mammal can be widely used in extracting superoxide dismutase from the blood of any mammal.

The invention discloses an airbag shell inflation suspension proppant which structurally comprises a proppant body serving as a core, the surface of the proppant body is wrapped with an inner coating, and the surface of the inner coating is wrapped with an outer coating. The inner coating comprises an adhesive and a gas generating agent, and the gas generating agent is at least two of ammonium chloride, sodium nitrite, potassium nitrite, urea, sodium carbonate, ammonium carbamate, sodium bicarbonate, ammonium nitrate, potassium nitrate, sodium nitrate, acetylsalicylic acid, citric acid, sulfamic acid and oxalic acid. The outer coating comprises a capsule shell agent, and the capsule shell agent is formed by polymerizing at least two monomers of polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, tert-butyl acrylate, butyl methacrylate and styrene. Under the stimulation of a certain external environment, the gas generating agent responds and decomposes to generate gas, the outer coating wraps and seals the generated gas to form an airbag, and self-suspension of the proppant in slick water is achieved under the buoyancy effect of the airbag.

The invention discloses a method for preparing modified flocculant from organic wastewater by diatomite and belongs to the technical field of organic wastewater treatment. The method uses diatomite asraw materials, SiO2 is extracted to synthesize sodium metasilicate pentahydrate, then polyaluminium ferric silicate is prepared, and carboxymethyl starch (CMS) is used for modifying the prepared polyaluminium ferric silicate (PAFCSC) flocculant to obtain the modified flocculant. The preparation of the flocculant by diatomite meets the requirement of comprehensive utilization of natural resources.Moreover, the demand for the flocculant is very high in China and even in the whole world, aluminum and iron flocculants occupy a large market because of good treatment effects and low cost, therefore, the preparation of the PAFCS flocculant by diatomite has great economic and social significance.

The invention discloses a preparation method of an acid modified caustic calcined magnesite printing and dyeing wastewater treatment agent, relating to a preparation method of a wastewater treatment agent. According to the preparation method, low-grade caustic calcined magnesite is used as a raw material, and the water treatment agent product is prepared by adopting industrial hydrochloric acid through an acidification process. The preparation method is characterized by comprising the following steps: adding industrial 3-7 percent hydrochloric acid to a beaker filled with caustic calcined magnesite according to a mass volume ratio of 1: (0.8-1.2)(g / ml); mixing and stirring for 10-20 minutes at room temperature; standing for reacting for 15 minutes; and drying by microwaves or a drying oven and then crushing to prepare the acid modified caustic calcined magnesite printing and dyeing wastewater treatment agent. According to the preparation method disclosed by the invention, the low-graded caustic calcined magnesite and low-concentration industrial hydrochloric acid are adopted as main raw materials; the preparation process is simple; no wastewater and waste slag are generated; the production cost is low; the preparation method is environment-friendly. The acid modified caustic calcined magnesite printing and dyeing wastewater treatment agent has relatively good application scope and adsorbing and decoloring effects on reactive dyes, acidic dyes and direct dyes.

The invention relates to a preparation method of a water treatment agent, in particular to a preparation method of an acid-modified caustic-calcined magnesite / pulverized fuel ash water treatment agent. The preparation method comprises the steps of taking the caustic-calcined magnesite and the pulverized fuel ash by weighing according to the mass ratio of 1:1 (g / g), adding industrial hydrochloric acid with the mass fraction of 10%-12% into a vessel containing the caustic-calcined magnesite and the pulverized fuel ash according to the mass-column ratio of 1:1.2-1.4 (g / mL), stirring the mixture at the temperature of 450 DEG C-550 DEG C, acidizing the mixture for 30 min, carrying out a standing reaction for 40 min-60 min, and drying and smashing the mixture to obtain the acid-modified caustic-calcined magnesite / pulverized fuel ash water treatment agent product. According to the preparation method, raw materials are the low-grade caustic-calcined magnesite, the low-grade pulverized fuel ash and the low-concentration industrial hydrochloric acid; the preparation process is simple, neither waste water nor waste residues are produced, the production cost is low, and environmental friendliness is achieved; the acid-modified caustic-calcined magnesite / pulverized fuel ash water treatment agent is a novel water treatment agent integrating the functions of adsorption, coagulation, filtration and the like, can well adapt to the pH values of contaminants such as reactive dyes and heavy metal and can well remove the contaminants.

The invention discloses a glutamine transaminase mutant with improved enzymatic activity, which belongs to the field of enzyme engineering. The site-specific mutagenesis is performed on glutamine transaminase, an amino acid residue close to an active site of the glutamine transaminase is changed, so that the catalytic efficiency of the glutamine transaminase is improved, and the enzymatic activityof the glutamine transaminase is further improved. Recombinant yarrowia lipolytica with improved enzymatic activity is established by the glutamine transaminase mutant, the enzymatic activity of theglutamine transaminase is improved by 1.45 times compared with an original strain, the enzymatic activity of the shake flask fermentation can reach 16.995U / mL, and the enzymatic activity of the fermenting tank fermentation can reach 59.85U / mL which is the highest fermentation value reported at present.

The invention relates to textile dyes and particularly relates to a red-light blue azo disperse dye with high color development strength and a preparation method therefor. The disperse dye has a structure represented by a formula I shown in the description and is prepared through the steps: carrying out salt forming on 2-amino-3-acetyl thiophene in concentrated sulfuric acid, carrying out nitration reaction at the temperature of -20 to 0 DEG C so as to obtain a nitration product 2-amino-3-acetyl-5-nitrothiophene, then, adding activated carbon to the nitration product for adsorption, carrying out filtration, then, adding propanoic acid into the filtrate, then, dropwise adding nitrosyl sulfuric acid into the filtrate at the temperature of -15 to 0 DEG C, and carrying out diazotation, so as to obtain a diazotized solution; and dripping the obtained diazotized solution into a coupling component dispersed in ice water at the temperature of -5 to 0 DEG C, then, maintaining the temperature for 1-2 hours, carrying out filtration, and carrying out water washing, thereby obtaining the disperse dye represented by the formula I shown in the description. The dye prepared by the method is high in color development strength, bright-colored in color light and good in application performance. The dye has the advantages that the economical efficiency is obvious, few waste gases, waste water and waste residues are generated during preparation, and the like.

The invention discloses a Schiff base fluorescent probe and use thereof in detecting lead ions, relates to a fluorescent probe which is markedly enhanced in fluorescence in the presence of the lead ions, and provides a 3-methylpyrazolyl benzaldehyde 4-aminoantipyrine Schiff base for selectively detecting the lead ions and a preparation method thereof. Firstly, 3-methylpyrazole and p-fluorobenzaldehyde are used as raw materials to prepare 3-methylpyrazole benzaldehyde, and a Schiff base with a larger conjugated PI structure is obtained by condensation reaction of an aldehyde group and a primaryamine of the 3-methylpyrazolyl benzaldehyde and 4-aminoantipyrine. The process has the advantages of easy availability of raw materials, low synthesis cost, simple operation, easy preparation, high yield and the like. The probe has good selectivity to the lead ions, easy identification, fast response time and strong pH adaptability and other characteristics, is a simple and sensitive specific detection reagent that can quickly identify the lead ions, can be used in the field of materials or sensors, and has potential application value in the field of biological environment testing.

The invention relates to a wastewater treatment system and process. The wastewater treatment system comprises an adjusting tank, physicochemical integrated treatment equipment, biochemical membrane treatment integrated treatment equipment and a clean water tank which are sequentially communicated, the physicochemical integrated treatment equipment comprises a demulsification coagulation reactiontank, a flocculation tank and an air flotation machine which are sequentially communicated, the slag discharging opening of the air flotation machine is connected with a filter press; the adjusting tank is communicated with the demulsification coagulation reaction tank; the biochemical membrane treatment integrated treatment equipment comprises a hydrolysis acidification tank, an anaerobic tank and a membrane biological reaction tank which are sequentially connected and communicated, wherein an aeration device and an MBR membrane separation and filtration system are arranged in the membrane biological reaction tank, a reflux pump is further arranged in the membrane biological reaction tank, a reflux pipe is connected to the reflux pump, and the reflux pipe is communicated with the anaerobic tank; the hydrolytic acidification tank is communicated with the water outlet of the air flotation machine, and the water outlet of the MBR membrane separation and filtration system is communicatedwith the clean water tank. The wastewater treatment system has the advantage that the hardware workpiece cleaning wastewater can be economically and efficiently purified.

The invention discloses a Mucor rouxianus XJYL HN0512 and a method for fermentation production of xylanase by adoption of the strain, wherein, the strain is preserved in China Center for Type Culture Collection; the preservation time is January 18th, 2008 and the preservation No. is CCTCC NO:M 208014. The method is as follows: the Mucor rouxianus HN0512 strain is inoculated into a fermentation medium which contains xylans, yeast powder, peptones and other nutritive materials for fermentation culture, and the xylanase is produced through induction and fermentation under aerobic conditions. The xylanase produced has wide pH adaptability and high temperature tolerance and has wide application prospect in aspects of foodstuffs, feedstuffs, paper making, energy and the textile industry.

The invention provides a preparation method of acid-modified caustic calcined magnesia / bentonite water treatment chemicals and belongs to water treatment chemical preparation methods. The method comprises the steps that a certain amount of caustic calcined magnesia and a certain amount of bentonite are weighed according to the mass ratio of 1.5-2:1 (g / g); technical hydrochloric acid with the mass fraction of 9% is added into the caustic calcined magnesia and the bentonite according to the mass-to-volume ratio of 1:1.2 (g / mL); the mixture is stirred, mixed and acidized for 30 minutes at the temperature ranging from 45 DEG C to 55 DEG C and then subjected to standing for 30 minutes; after being subjected to microwave irradiation or high-temperature drying, the obtained product is smashed, and then the prepared acid-modified caustic calcined magnesia / bentonite water treatment chemicals are obtained. According to the preparation method, production raw materials comprise low-grade caustic calcined magnesia powder, the calcium bentonite and the low-concentration technical hydrochloric acid; the preparation process is simple, no waste water and waste residues are generated, and the acid-modified caustic calcined magnesia / bentonite water treatment chemicals are low in production cost and friendly to environment, are novel water treatment chemicals integrating the functions of coagulation, adsorption, filtration and the like, have a wide pH application range to reactive dyes, heavy metal and other pollutants and have a good effect on removing the reactive dyes, the heavy metal and other pollutants.

The invention discloses a viscous biological sample digestive agent composition. The viscous biological sample digestive agent composition comprises protease, a stabilizer and a synergist, wherein theprotease is papain, cathepsin, subtilisin or protease K; the stabilizer comprises saccharides, cyclodextrin and a biological buffer agent; and the synergist is sodium pyrophosphate, triethanolamine,sodium ethylene diamine tetracetate, tartaric acid or sodium citrate. The invention further provides a viscous biological sample digestive agent. The viscous biological sample digestive agent comprises any one of the digestive agent compositions and deionized water. The invention further provides a preparation method of the viscous biological sample digestive agent. The preparation method comprises the following steps of: dissolving the stabilizer, the synergist and a hypertonic agent in the deionized water, adjusting the pH value to 7.2-7.4, adding the protease, and stirring and dissolving toobtain the viscous biological sample digestive agent. The digestive agent solution is stable in liquid state, does not need to be compounded before being used by a user, does not damage pathogenic bacteria, can be stored at normal temperature, takes effect in the optimal pH range of the pathogenic bacteria, and can be universally used for different detection items.