60results about How to "PH effect is small" patented technology

The invention discloses amino-terminated modified cellulose, and a preparation method and application thereof. The method comprises the following steps: firstly, soaking a bagasse material which is cleaned and dried into constant weight in concentrated alkaline for over 10 hours; washing, carrying out suction filtering and drying to obtain alkaline bagasse fibers; then carrying out an oxidation reaction on the alkaline bagasse fibers and a strong oxidant in a dark condition, so as to obtain dialdehyde bagasse cellulose; with methyl methacrylate and ethanediamine as raw materials, stirring in an organic solvent under dark and oxygen-isolated conditions to carry out a polymerization reaction, so as to obtain an amino-terminated hyperbranched polymer; and finally carrying out a reflux reaction after dissolving the dialdehyde bagasse cellulose and the amino-terminated hyperbranched polymer into the organic solvent, so as to obtain the amino-terminated hyperbranched grafted dialdehyde cellulose. The modified cellulose not only has good adsorptive property on heavy metal ions in a wastewater solution, but also is easy to separate after adsorption. Thus, the amino-terminated modified cellulose has the water purification effects of simple method and low cost.

The invention relates to a preparation method and application of an iron-sulfur heterogeneous Fenton-like catalyst. The preparation method comprises the following steps of adding a dispersing agent into a ferrous solution, and performing uniform stirring; sequentially and slowly pouring solutions of hydrosulfide and sulfide into the solution, keeping the pH of the solution to be 5.0 to 5.5, and performing stirring for 10 to 20min; slowly adding a solution of sulfite into the solution, keeping the pH value to be 5.0 to 5.5, and performing stirring for 5 to 10min to obtain precursor sol; transferring the precursor sol into a sealed glass bottle, and performing constant temperature (25 DEG C) aging reaction in dark to obtain black precipitates, i.e. the final catalyst. The pH of wastewater is regulated to 7.0 to 11.0, a mixed solution of hydrogen peroxide / persulfate and the synthesized heterogeneous fenton-like catalyst are added into the wastewater, and stirring reaction is performed for 10 to 120min to finish the degrading of organic pollutants in the wastewater. A preparation process of the prepared iron-sulfur heterogeneous Fenton-like catalyst is simple, conditions are mild, and when being used, the prepared iron-sulfur heterogeneous Fenton-like catalyst is large in applicable pH range, and has a good deep treatment effect on industrial wastewater.

The invention discloses an iron modified chitosan defluorinated particle adsorbent and a preparation method thereof. The preparation method comprises the following steps: step 10, chitosan is dissolved in an acetum at the indoor temperature and stirred until the chitosan is completely dissolved in the acetum to obtain a chitosan solution; step 20, hexahydrate ferric trichloride is added into the chitosan solution and stirred to be uniform, and the mixed solution is put to be stationary; step 30, the mixed solution is added into ammonia water dropwise, put to be stationary, washed by deionized water to be neutral and dried to obtain the particle adsorbent. According to the invention, the method is adopted, so that not only is the prepared iron modified chitosan defluorinated particle adsorbent high in the removal rate of fluorinion and large in adsorbing capacity, but also the removal rate of fluorinion is less influenced by temperature and pH.

The invention relates to a method for removing an iodo-X-ray contrast medium in water. The method includes the steps: oxidant feeding, to be more specific, adding sodium persulfate into to-be-treatedwater until the concentration of sodium persulfate in the water reaches 23.8-71.4mg / L; ultraviolet irradiation, to be more specific, subjecting the to-be-treated water to ultraviolet irradiation for 5-10 minutes after oxidant feeding. Compared with the prior art, the method has advantages that high degradation efficiency is achieved, the concentration of the ICM (iodo-X-ray contrast medium) in thewater can be decreased by 87% or more, the method is slightly affected by pH (potential of hydrogen) changes, and reaction products are mainly sulfate ions and iodate ions and can be removed by simple coagulation, precipitation or membrane filtration, so that the method is a safe and stable drinking water treatment method.

The invention relates to a cationic flocculant and application thereof. An adopted technical scheme is as follows: adding dicyandiamide to a reaction kettle, slowly adding formaldehyde, preventing explosion and boiling, controlling temperature at 30-40 DEG C, and stirring for dissolving; adding metallic salt which accounts for 3 / 4 of total amount to the reaction kettle firstly, reacting at 60-100 DEG C for 2-4h, then adding rest 1 / 4 metallic salt, reacting at 60-100 DEG C for 1-3h, and finally regulating the PH to 8-9, thus obtaining a target product. The dicyandiamide-formaldehyde cationic flocculant disclosed by the invention has the characteristics of being good in decoloring effect, broad in application scope, low influence from PH of wastewater, low addition, little generated sludge and the like; and the cationic flocculant, besides dyed wastewater, also has a good treatment effect on oily sewage, papermaking wastewater, slaughtering wastewater and SCN- in food.

The invention relates to the pharmaceutic preparation field and in particular relates to atenolol pH independent sustained-release tablets and a preparation method thereof. The atenolol pH independent sustained-release tablets are characterized by being prepared through the steps of evenly mixing a prescription amount of atenolol, HPMC (Hydroxy propyl methyl cellulose) K15M, eudragit RSPO, high-viscosity PEO (Polyethylene Oxide) and lactose monohydrate in such a manner of progressively increasing by equal amount, next, adding a small quantity of magnesium stearate and aerosil as the lubricant, and then forming the atenolol pH independent sustained-release tablets through a powder vertical-compression process. The pH independent sustained-release tablets are prepared effectively, and the slightly alkaline drug atenolol is provided to have similar release characteristic under different simulated gastrointestinal tract pH conditions. The HPMC stable in slow release performance is taken as the slow release framework of the pH independent sustained-release tablets, the eudragit RSPO is taken as the pH regulator of the pH independent sustained-release tablets, and the high-viscosity PEO is taken as the retardant of the pH independent sustained-release tablets; the preparation process is simple, the adverse effect of the drug is remarkably reduced and the compliance of the patient is improved; and besides, the pH independent sustained-release tablets have important economic value and social significance.

The invention provides a furan type water algaecide, which is prepared from an active component 2, 5-diformyl furan. The invention further provides algae removal application of the algicide in water treatment. The algaecide has an excellent algae removal rate in a short time, and can maintain a high algae removal rate in a long time; besides, the algaecide is a bio-based algaecide, is low in ecological toxicity and environment-friendly in source, has relatively good inhibiting and killing effects on wild cyanobacteria, euglena and the like, and can be applied to treatment of cyanobacteria bloom, gallophyte bloom and bloom caused by other algae.

The invention discloses hexavalent chromium pollution in-situ repairing agent FeSx, preparation and application. The preparation includes: preparing a solution of water-soluble sulfur-containing regent as well as water-soluble iron-containing reagent, mixing well at pH 3.0-8.0, and carrying out solid-liquid separation to obtain solid that is iron polysulfide (FeSx), used as in-situ repairing agent for hexavalent chromium polluted soil and underwater.

The invention relates to a preparation method of a coagulant used for sewage and surface water treatment, in particular to a preparation method of a composite iron-zinc coagulant. The invention mainly solves the problems of high cost, poor adaptability and the like existing in the existing coagulant. A preparation method of a composite iron-zinc coagulant of the present invention comprises the following steps: (1) taking iron salt solution and aluminum salt solution according to the volume ratio of 1:1 to 10 and mixing them uniformly to make a mixed solution, and then using alkali solution to adjust the pH of the mixed solution to 1.8 to 2.3; (2) pass oxidizing gas into the mixed solution, then microwave treatment for 10 to 60 minutes, and age for more than 12 hours to make polymerized iron / aluminum composite colloid; (3) take a certain Add 2-10% zinc sulfate or zinc chloride solution to the polymerized iron / aluminum composite colloid, and then add 2-10% polydimethyldiallyl ammonium chloride solution to make a composite iron-zinc coagulant . The invention has the advantages of simple process, low cost, good coagulation effect and the like.

A method for quantitatively detecting the concentration of hydroxyl radicals in a Fenton decomposition system relates to a method for quantitatively detecting the concentration of hydroxyl radicals in a solution. The purpose of the invention is to solve the problems of expensive equipment, complex operation and difficult quantitative detection of OH concentration used in the existing method for detecting OH concentration in H2O2 solution. Method: 1. Prepare the solution to be tested; 2. Draw the standard curve; 3. Obtain the regression equation; 4. Calculate the concentration of hydroxyl radicals in the extract to be tested according to the regression equation in step 2, that is, complete a quantitative detection Fenton's method for the concentration of hydroxyl radicals in the decomposition system. The invention determines the critical concentration of H2O2, avoids the influence of high-concentration H2O2 on the spectrophotometric detection method based on the Russell reaction mechanism, and greatly improves the detection accuracy. The invention can obtain a method for quantitatively detecting the concentration of hydroxyl free radicals in a Fenton decomposition system.