55 results about "Green rust" patented technology

The invention belongs to the inorganic chemical technical field, in particular to a preparation method of important intermediate, namely green rust which is obtained in the process of generating various ferrites. The specific steps are as follows: a reaction device is built, and the ferrous solution is prepared by taking the ascorbic acid aqueous solution the mol concentration of which is 2.5x10<-4> to 7.5x10<-4>mol / l as the solvent and FeSO4 as the solute and is put in a four-mouth flask in nitrogen atmosphere; the alkaline solution is put in a pipe of a constant pressure titration funnel, and the Fe2(SO4)3 solution is put in the other pipe of the constant pressure titration funnel; the FeSO4 solution and the Fe2(SO4)3 solution are the same in mol concentration; the solution in the four-mouth flask are evenly stirred by the magnetic stirring until the PH value of the solution in the four-mouth flask is adjusted to 6, and the Fe2(SO4)3 solution is dropwise added and simultaneously the alkaline solution is dropwise added, which keeps the PH value of the solution to 6; after the Fe2(SO4)3 solution is completely added, the PH value of the solution is recorded, and the alkaline solution continues to be dropwise added, simultaneously the color change of the solution is observed, and the reaction is over until the PH value of the solution is 7; and the needed products are obtained after aging. The green rust prepared by the invention is high in purity, and the reaction conditions needed in the invention are mild.

A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the reducing iron compound is added to a reaction tank and forming a precipitate, separating the formed precipitate by a solid-liquid separation to obtain a sludge, and alkalinizing all or a portion of the separated sludge to form an alkaline sludge followed by returning to the reaction tank, wherein in the precipitation step, the wastewater to which the reducing iron compound is added and the alkaline sludge are mixed and are allowed to react in a non-oxidizing atmosphere under alkaline condition to form a reducing iron compound precipitate as the precipitate, thereby incorporating contaminants in the precipitate to remove the contaminants from the wastewater.

The invention regards a composite for environmental remediation, comprising: one or more green rust compound(s) or green rust precursor(s), and one or more biochar(s).

The invention belongs to the technical field of sewage treatment, and particularly discloses a green rust material for fixing anaerobic lake sediment phosphate as well as a preparation method and application thereof. The method comprises the following steps: stirring Fe(OH)2 turbid liquid to oxidize Fe(OH)2 to obtain turbid liquid containing Fe(OH)2 and Fe(OH)3; continuously stirring in an oxygen-free environment to remove O2 in the turbid liquid, and filtering and washing the turbid liquid to obtain the green rust material. The prepared green rust can stably exist under an anaerobic condition; the green rust has a strong performance on combining phosphate, meanwhile, the structure of the green rust under the anaerobic condition is further stabilized through adsorption of phosphate, and the long-term fixing effect on phosphorus in the bottom mud can be achieved. Therefore, the problem that other ferric minerals are reduced under anaerobic conditions to release iron and phosphorus is solved; and the green rust is an iron-based ore and has the characteristic of selectively adsorbing phosphate, so that the green rust is not easily influenced by other interfering ions.

The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a preparation method of green rust, an important intermediate produced in various ferrite production processes. The specific steps are as follows: build a reaction device, use ascorbic acid aqueous solution with a molar concentration of 2.5×10-4 to 7.5×10-4 mol / L as a solvent, and FeSO4 as a solute to prepare a ferrous solution, and place it in a four-necked flask under a nitrogen atmosphere; Place the alkaline solution in one tube of the constant pressure titration funnel, and place the Fe2(SO4)3 solution in another tube of the constant pressure titration funnel; the molar concentrations of FeSO4 and Fe2(SO4)3 solutions are equal; Using magnetic stirring, the solution in the four-necked flask is stirred evenly, the pH value of the solution in the four-necked flask is adjusted to 6, Fe2(SO4)3 solution is added dropwise, and the alkaline solution is added dropwise at the same time, so that the pH value of the solution is maintained at 6; after the Fe2(SO4)3 solution is dripped, record the pH value of the solution, continue to drop the alkaline solution in the solution, and observe the color change of the solution at the same time, until the pH value of the solution is 7, the reaction ends; aging, that is get the desired product. The green rust prepared by the invention has high purity and mild reaction conditions.

The invention discloses a chlorine-free rust-proof concrete early strength water-reducing agent and a preparation method thereof. The chlorine-free rust-proof concrete early strength water-reducing agent is made from, by weight, 12-18 parts of sulfonated melamine formaldehyde resin, 10-15 parts of sulfanilate, sulfonated acetone and formaldehyde condensate, 8-12 parts of starch and acrylic acid grafted copolymer, 4-8 parts of calcium butyrate, 6-9 parts of anhydrous sodium sulfate, 4-8 parts of magnesium chromate, 10-15 parts of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt, 7-11 parts of Pulullan, 3-6 parts of urea, and 5-7 parts of sodium polyacrylate. The calcium butyrate, anhydrous sodium sulfate, Pulullan, urea and sodium polyacrylate replace chloride early strength agents to be used with the water-reducing agents such as sulfonated melamine formaldehyde resin, sulfanilate, sulfonated acetone and formaldehyde condensate, and poly(4-styrenesulfonic acid-co-maleic acid) sodium salt, and the water-reducing agent has high water-reducing rate and good early strength effect, is free of chlorine ions, is rust-free for reinforcement and is good in anti-cracking effect.

The invention discloses a green rust-doped nano-silver particle dechlorination agent and a preparation method and application thereof, comprising the following steps: adding ferric nitrate and ferrous nitrate into water, stirring under sealing conditions until the ferric nitrate and ferrous nitrate are completely dissolved, and obtaining iron base solution; mix the iron-based solution with activated carbon powder, and stir under sealing conditions to obtain iron-loaded carbon slurry; mix silver nitrate into ammonium hydroxide solution with a pH of 10-12, and stir under sealing conditions until the silver nitrate is completely dissolved to obtain Silver ammonia solution; mix the silver ammonia solution and iron-carrying carbon slurry, stir evenly under sealed conditions to obtain a mixed slurry, then add hydrazine hydrate to the mixed slurry, and stir evenly under sealed conditions to obtain a dechlorination agent doped with nano-silver rust. The preparation process of the invention is simple, and the raw materials and reagents involved are simple and easy to obtain. Compared with the traditional green rust material, the reaction efficiency of the green rust-doped nano-silver particle dechlorination agent of the present invention is higher, and it can be applied to the water environment with pH equal to 6-12, and can achieve a maximum of 99% 1,2,4-trichlorobenzene remove.

The invention discloses a method for adsorbing tetracycline in underground water by using green rust. The method comprises the following steps: adding 0.5-8g / L green rust into a reaction bottle filledwith a solution with TC initial concentration of 1-80mg / L in an anaerobic incubator, tightly capping the bottle, placing the bottle on a rotary incubator to rotate away from light at a rotating speedof 30-70 r / min, performing timing sampling, and performing solid-liquid separation on obtained samples through a 0.45-micron filter membrane so as to achieve tetracycline adsorption. The method provided by the invention for adsorbing tetracycline in underground water by using green rust can effectively control the potential toxic substance TC in the underground water and ensure the safety of thedrinking water source of the underground water.

The invention relates to a coating, in particular to an environment-friendly anti-rust coating using water-in-water. The water-in-water environment-friendly anti-rust paint includes a film-forming adhesive and a water-soluble rust-spot reaction solid substance greater than 0.1 g / liter; the solid substance can chelate with iron. The water-in-water environment-friendly anti-rust paint provided by the invention can further improve the corrosion resistance of outdoor buildings and increase reliability.