42 results about "Schwertmannite" patented technology

The present invention provides the biosynthesis of Schwertmannite as high efficiency adsorbent and its usage in adsorbing to eliminate Cr(VI) and As from waste water and underground water. Schwertmannite is prepared with ferrous sulfate as reactant, deionized water as reaction medium and Thiobacillus ferrooxidans LX5 as catalytic oxidant, and through stirring for 1-3 days, filtering to collect precipitate, washing with sulfuric acid acidified deionized water, washing with deionized water and stoving. Schwertmannite is added into water to be treated in the amount of 0.5 wt% or 0.02 wt%, dilute nitric acid is added into Cr(VI) containing system to regulate the pH value to 5.0-7.0 or sodium hydroxide is added into As containing system to regulate the pH value to 6.0-10.0, and the system is stirred for 3 hr and filtered to eliminate Cr(VI) and As. Schwertmannite has maximum adsorption amount on Cr(VI) and As of 55 mg / g and 65 mg / g separately.

A treating material for treating a polluted water containing, as a hazardous substance, arsenic, lead, cadmium, antimony, uranium, phosphorus, fluorine or the like, which comprises an oxygen-containing iron compound carried on a material containing a silicic acid based fiber or a silicate based fiber; a method for producing the treating material which comprises contacting and reacting a silicate based fiber, such as rock wool, with an iron-containing acidic water; and a method for treating the polluted water witch comprises contacting the treating material with the polluted water. The treating material has a fine structure wherein the above oxygen-containing iron compound is attached in a sheath form on the surface of a fiber reduced in an alkali component and increased in a silicic acid component as compared to, for example, rock wool. The oxygen-containing iron compounds include schwertmannite, ferrihydrite, akaganeite, amorphous hydrous iron oxide and fired ferric sulfate.

The invention discloses a method for removing phenol in water and particularly discloses a technical method for catalyzing the oxidation reaction of H2O2 with phenol in the water by Schwertmannite. The method comprises the following step of preparing the Schwertmannite through synthesis by a ferric sulfate hydrolysis method. When the Schwertmannite is used for catalyzing the oxidation reaction of the H2O2 with the phenol, the removal rate of the phenol can reach more than 99%. The catalyst adopted in the invention can be cyclically used. After being repeatedly used for ten times, the catalyst can still have an effect of catalyzing the oxidation reaction of the H2O2 with 97% of phenol. The method has the advantages that the Schwertmannite is easy to synthesize and prepare, is at a low cost and can be cyclically used, and the technical method is easy to operate and manage, efficient and environment-friendly.

The invention discloses a method for treating arsenic in water by using high-specific-surface-area Schwertmannite as adsorbent, belonging to a waste water treatment technology. The method comprises the following procedures: adding artificially synthesized Schwertmannite having a high specific surface area into arsenic-containing waste water; and according to the specific ratio of As(V) to As(III) in the waste liquid, regulating the pH value of the waste liquid to a proper valve with acid and alkali, thus recovering As(V) and As(III) in the industrial waste water, wherein the As(V) adsorption capacity can be up to 182.86 mg.g<-1>(pH 3.0), and the As(III) adsorption capacity can be up to 217.85 mg.g<-1>(pH 7.0); and the adsorbent can be repeatedly used 7 times. According to the invention, the provided natural mineral adsorbent is low in cost, high in adsorption capacity and friendly to environment and can adsorb As(V) and As(III); and the adsorbent can be dissolved in strong acid, thereby avoiding the secondary pollution of solid waste.

The invention belongs to the field of environmental engineering and discloses granular Schwertmannite and its preparation method and use. The granular Schwertmannite comprises particles which are prepared by loading specific carriers with NaOH solution-modified biogenic Schwertmannite on carrier surfaces and have an average particle size of 4.06mm. The surface of the granular Schwertmannite is covered with reddish-brown Schwertmannite so that the granular Schwertmannite can maximumly contact with pollutants and can resist flow-velocity dynamic water flow impact. The surface of each zeolite is loaded with about 3.7mg of Schwertmannite so that mineral high-adsorption performances can be maximumly used. The granular Schwertmannite has a pellet shape and is convenient for As recovery and regeneration.

The invention provides thiobacillus acidophilus. The name of the strain is Thiobacillus ferrooxidans ST-A, the Thiobacillus ferrooxidans ST-A is preserved in the China Center for Type Culture Collection (located in Wuhan University) on May 24, 2015, and is assigned with the accession number of CCTCC NO:M2015333. When the strain is adopted for treating iron-containing acid mine wastewater, divalent iron ions are oxidized in an acceleration manner under low pH, and then trivalent iron ions are generated; under the suitable pH, the strain can catalyze the trivalent iron ions to form schwertmannite (Fe8O8(OH)6(SO4)) sediment, so that the iron resource is effectively recycled, meanwhile, the recycled iron-containing sediment does not contain other valuable metal (copper, zinc and the like), and thus an operable process is provided for the resource recycling of metal in the acid mine wastewater.

The invention discloses Schwertmannite for simultaneously removing pollution of As (III) and Cr (VI). The preparation method comprises the following steps: heating deionized water to 50-70 DEG C; thenadding FeCl3.6H2O and Na2SO4 and stirring the mixture to uniformity; then performing heat preservation and stirring on mixed solution for 5-20 min, cooling a precipitate formed in the reaction to theroom temperature and then transferring the precipitate into a dialysis bag; and dialyzing the precipitate for 5-10 days until the conductivity is lower than 100 [mu]s / cm, and performing centrifugal drying to prepare the powder with the specific surface area being 100-300 m<2> / g. The Schwertmannite has a good removal effect on arsenic and chromium in an As (III) and Cr (VI) binary pollutant coexistence system, and the removal shows a redox-adsorption combined effect, so that the toxicity of two pollution elements can be further reduced while the concentrations of arsenic and chromium in a water body are reduced.

The invention discloses a chromium reducing method based on iron-containing sulphide ore under action of acidophilic bacteria, belonging to the wastewater treatment technology of the environmental engineering field. The chromium reducing method comprises the following steps: introducing thermoacidphilic iron-sulfur oxidizing bacteria into a chromium reducing process of the iron-containing sulphide ore, and adhering a biological membrane on the surface of the pyrite. The chromium reducing method can be used for effectively relieving a passivation layer on the surface of the pyrite, overcoming the problem that the raw material utilization efficiency of the pure chemical reaction is low, greatly quickening kinetics of reduction, and completely utilizing the pyrite. After being reduced, the chromium, an iron ion and sulfate radical in the system can form precipitates such as jarosite and schwertmannite which are filtered and separated, so that the trivalent chromium ion in the system can be removed. The reduction government mode is wide in scope of application, low in site requirement and long in operation period and has large-scale industrial application potential.

The invention relates to a preparation method of triazine ramification inserting layer laminated clay heavy metal catching agent and an application. The preparation method comprises the steps of firstly displacing potassium ions in laminated clay by using inorganic acid or quaternary ammonium salt under certain temperature and certain concentration of a displacer; carrying out intercalation on the laminated clay of the potassium ions after displacing, carrying out reaction on the primary amine in the laminated clay after intercalation and cyanuric chloride, and thus preparing triazine intercalation ramification ramification layer laminated clay; carrying out reaction on the triazine intercalation ramification ramification layer laminated clay and sodium sulfide so as to obtain sulfhydrylation triazine ramification inserting layer laminated clay heavy metal catching agent. The sulfhydrylation triazine ramification inserting layer laminated clay is singly applied in heavy metal sewage treatment or is applied by combining with the existing schwertmannite and has remarkable effect. The preparation method of the triazine ramification inserting layer laminated clay heavy metal catching agent and the application provided by the invention have the outstanding characteristics that compared with the existing processing agent, the removal rate of ions such as heavy metal lead, arsenic and cadmium in the water can achieve more than 96.3% without filtering, and the purposes that the labor is saved and the time is saved are achieved in the industrial application of processing the sewage containing heavy metal.

The invention provides a method and a system for biologically treating acidic mine wastewater and simultaneously recovering iron ions. The method comprises the following steps: (1) carrying out biomineralization on the acidic mine wastewater by acidophilic iron-oxidizing bacteria, carrying out cyclic biological reduction treatment by acidophilic iron-reducing bacteria, introducing the wastewater into an alkali regulating tank, circularly regulating the pH value, and circulating an effluent to a biomineralization treatment unit for cyclic treatment; and (2) after reaction for a period of time,leading the wastewater out from the tail end of the water collecting tank and can be subsequently connected with a lime neutralization treatment system, and recycling jarosite minerals or schwertmannite minerals in the biological mineralization unit. The screened bacteria are indigenous strains existing in the actual mine environment and can be completely suitable for mine wastewater treatment. According to the invention, the precipitation amount of iron in the acid wastewater is increased by adopting circular treatment, and the mine wastewater can completely reach the standard by subsequentlyconnecting lime for neutralizing treatment.

The invention discloses a preparation method and application of Schwertmannite. The preparation method comprises the following steps: (1) preparing Schwertmannite by using waste iron as an iron source; and (2) removing As (III) in water by using the prepared Schwertmannite. According to the invention, waste iron blocks are prepared into Schwertmannite, wherein waste iron scraps are completely dissolved with excessive H2SO4, then the iron content is measured, the molar ratio of Fe to H2SO4 is controlled to be (0.9-1): 1, the use amount of all substances can be reasonably controlled, H2O2 is added in batches, the Fe<3+> supply speed is slowed down, the SO4<2-> content is increased, more outer-layer SO4<2-> complexes are generated, As (III) in water can be effectively removed by using the Schwertmannite as an adsorbent, the adsorption reaction time is short, the treated As (III) range is wide (10-200 mg / L), the maximum As (III) adsorption capacity under the same treatment condition is remarkably higher than that of an existing adsorbent, and the product has wide application prospects.

The invention discloses a method for treating arsenic-containing wastewater or arsenic-polluted soil by utilizing autotrophic bacteria. According to the method, mineralization and arsenic removal areconducted mainly through the biological mineralization effect of acidithiobacillus ferrooxidans, Fe (II) in wastewater and soil is oxidized into Fe (III) through the acidithiobacillus ferrooxidans, As(III) and As (V) are fixed in the Schwertmannite forming process, and removal and stabilization of arsenic in water and soil can be achieved. The method is simple in steps, short in time and high inefficiency; reaction conditions are mild, the process is controllable, and economy and feasibility are achieved; the application range is wide, and As (III) and As (V) in polluted water and soil can be treated; in addition, the arsenic removal efficiency is high, the stability of the treated arsenic is high, and secondary pollution is avoided.

The invention relates to complete equipment using zero-valent iron to reduce and couple microorganisms to prepare Schwertmannite. The complete equipment comprises a biological oxidizing unit (1) and areducing unit (2) and is characterized in that the biological oxidizing unit (1) comprises an oxidizing area (11) and an oxidizing settling area (12); the reducing unit (2) comprises a reducing area(21) and a reducing setting area (22); the oxidizing area (11) uses Fe<2+> to produce the Schwertmannite; the oxidizing settling area (12) can perform solid-liquid separation; the reducing area (21) receives Fe<3+>-rich liquid and zero-valent iron from the oxidizing settling area (12) and allows Fe<3+> and the zero-valent iron to contact sufficient to generate Fe<2+> through reduction; the reducing setting area (22) can perform solid-liquid separation, and the separated Fe<2+>-rich liquid flows back to the oxidizing area (11) to participate in Schwertmannite production. The complete equipmentcan increase the yield of the Schwertmannite and can achieve continuous large-scale production.

The invention discloses an MoS2 / schwertmannite Fenton composite catalyst, and a preparation method and application thereof, and belongs to the field of water treatment. The structure of the compositecatalyst is as follows: MoS2 with a lamellar structure is distributed on the surface of sphere-shaped schwertmannite. In an X-ray diffraction (XRD) pattern of the catalyst, characteristic diffractionpeaks of schwertmannite exist at positions of 26.26 degrees, 35.16 degrees, 46.53 degrees and 61.34 degrees, and characteristic diffraction peaks of MoS2 exist at positions of 14.38 degrees, 32.67 degrees, 35.87 degrees, 39.53 degrees, 49.79 degrees, 58.33 degrees and 72.79 degrees. The composite catalyst can accelerate circulation of Fe<3+> / Fe<2+> in a Fenton-like oxidation reaction under illumination and light-shielding states, and oxidation reaction efficiency is promoted. The invention further provides the preparation method of the catalyst and application of the catalyst in the field of wastewater treatment.

The invention provides a Schwertmannite for removing phosphorus in sewage and an efficient synthesis method of Schwertmannite. The method comprises the following steps: regulating and strengthening oxidation, hydrolysis and mineralization reaction of soluble iron in acid mine wastewater by adding a small amount of alkaline substances, thereby greatly improving the synthesis efficiency (the primary mineralization rate is greater than 90%) of the Schwertmannite . The defects of low synthesis efficiency, long technological process and high cost of the Schwertmannite in the prior art are overcome. Meanwhile, the Schwertmannite synthesized based on alkali regulation and control can generate strong physical and chemical adsorption on phosphorus in phosphorus-rich sewage, sulfate in a mineral phase can also be exchanged with phosphate, the phosphorus adsorption performance is excellent (the adsorption capacity is 19.9 mg / g), and the Schwertmannite is a novel sewage phosphorus adsorption / phosphorus removal material with a great application prospect.

A new compound represented by a composition formula Fe8O8 (OH)8-2x((SO4)a, (HPO4)b)x (a+b=x, 1≦x≦1.75, 0<a≦1.658, 0.092≦b≦x) formed by adding a shwertmannite of a composition formula Fe8O8(OH)8-2x(SO4)x (1≦x≦1.75) to a phosphoric acid solution of a pH value of 2-9 thereby achieving a stabilization by an adsorption of phosphoric acid, shows a very firm stabilization under conditions of 0<a≦1.253 and 0.497≦b≦x. The new compound has a high stability, can maintain a high adsorbing ability for arsenic and the like and a cleaning level for a necessary period or semi-permanently, and can adsorb arsenic and the like in polluted water or polluted soil.

The invention discloses a titanium dioxide / schwertmannite composite catalyst as well as a preparation method and an application thereof. The titanium dioxide / schwertmannite composite catalyst is formed by loading nano titanium dioxide on schwertmannite through a ball milling method. The catalyst is simple in preparation method and low in cost, and is environmentally friendly; when the catalyst is applied to photo-Fenton degradation of organic wastewater, the catalyst has the advantages of high stability, high catalytic performance and low iron dissolving-out amount.

The invention provides a method for preparing hydroxy ferric sulfate slurry-based charcoal. The method comprises the following steps: (1) adjusting the pH value of a conventional municipal sludge solution with sulfuric acid to separate internal iron in sludge; (2) inoculating acidithiobacillus ferrooxidans into the sludge, wherein hydroxyl ferric sulfate sludge is formed from the acidithiobacillus ferrooxidans by utilizing the internal iron in the sludge; (3) dehydrating the hydroxyl ferric sulfate sludge, and drying; and (4) grinding and screening the dried sludge, and pyrolyzing the screened sludge in N2 protection. The hydroxy ferric sulfate slurry-based charcoal formed by pyrolysis contains schwertmannite which has an efficient and specific adsorbing effect on arsenic. The hydroxy ferric sulfate slurry-based charcoal has the advantages that hydroxyl ferric sulfate is generated by utilizing internal iron in sludge, and cost is reduced; the prepared hydroxy ferric sulfate slurry-based charcoal can be used for efficiently specifically adsorbing arsenic in sludge, so that the sludge resource is utilized, and a novel arsenic adsorbent is provided.

The invention discloses a catalyst for degrading phenol in water as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a novel catalyst Fe3O4 / Schwertmannite; and (2) treating phenol by virtue of the novel catalyst. By adopting the method of the invention, phenol in the water can be effectively degraded; the novel catalyst is used in the method, and more .OH can be generated, so that the decomposition rate of organic matters can be significantly increased, and phenol can be rapidly degraded under the acidic and neutral conditions. In addition, the Fe3O4 / Schwertmannite catalyst has magnetism and is easy to recover after the degradation reaction is ended, no environmental pollution is produced, and no additional manpower and material resource is needed for the subsequent treatment; and the used oxidant is low in price, the degradation period is short, and the application prospect for degrading phenol in the waste wateris wide.

A magnetic chemical absorbent according to the present invention is provided with a composite, which is constituted of a core substance comprising magnetite fine particles and schwertmannite being precipitated around the core substance to chemically bond therewith. This magnetic chemical absorbent can be produced in a hydrolysis reaction step, in which crystal of schwertmannite is precipitated by means of hydrolysis reaction by heating a solution of ferric salt and thereafter adding a reactive substance thereto, by means of adding magnetite fine particles into the solution after the solution is heated and before the precipitation of the crystal begins.This magnetic chemical absorbent is novel and good one whose absorption capability for harmful ion is upgraded more. In accordance with a waste-liquid treating method using this magnetic chemical substance, it is possible to intend the reduction of burdens in view of environmental and economic aspects. Moreover, this magnetic chemical absorbent is recyclable.

The invention discloses schwertmannite prepared by an alkali neutralization method and application of the schwertmannite, and belongs to the field of sewage treatment. According to the invention, the schwertmannite prepared through an alkali neutralization method is smaller in particle, larger in specific surface area and more in sulfate radical functional groups; when the schwertmannite is applied to removal of Cr (VI) in water, a larger number of sulfate radical functional groups can be dissolved out by controlling the pH value of a Cr (VI) solution, so that the Cr (VI) in the water is efficiently removed; and the method is simple to operate, low in cost, short in reaction time and free of secondary pollution to the environment, and has a good application prospect in removal of heavy metals such as Cr (VI) and the like in water.

The invention discloses molybdenum disulfide modified schwertmannite and a preparation method and application thereof, and belongs to the technical field of water treatment. The molybdenum disulfide modified schwertmannite contains Fe < 2 + > and Fe < 3 + >, the amount of Fe < 2 + > and the amount of Fe < 3 + > are measured through XPS, and the mass ratio of Fe < 2 + > to Fe < 3 + > is not lower than 1.90; meanwhile, the molybdenum disulfide modified schwertmannite contains 1T-phase molybdenum disulfide; and Fe-Mo-S bonds are formed between molybdenum disulfide and schwertmannite, and the catalytic activity is good.

The invention discloses a method for treating reverse osmosis concentrate by utilizing peroxymonosulfate activated by secondary iron ore and relates to a treatment method of the reverse osmosis concentrate. The treatment method disclosed by the invention comprises the following steps: adding biosynthetic Schwertmannite into to-be-treated water, performing reverse osmosis treatment, adding peroxymonosulfate into the reverse osmosis concentrate, stirring, reacting, and precipitating to obtain the effluent, thereby obtaining the product. Some heavy metal ions can be adsorbed from the Schwertmannite, and organic matters and the peroxymonosulfate can be adsorbed onto the mineral surface, so that a Fenton-like reaction is carried out between the peroxymonosulfate and Fe3+ on the surface of the Schwertmannite to produce SO4.-, and the organic matters are further degraded until the mineralization process of the organic matters is completed. The method disclosed by the invention has the characteristics that the secondary iron ore and peroxymonosulfate are environment-friendly, the pollutant removal efficiency is high, no toxic or harmful by-product is produced, the product is simple and readily available, and the method is a high-efficiency reverse osmosis concentrate treatment method integrating heavy metal removal and oxidative decontamination.

The invention discloses a composite stabilizing reagent for dearsenization residues. The composite stabilizing reagent for dearsenization residues comprises 20-50 wt% of FeS, 10-40 wt% of Fe2O3, 10-40wt% of FeSO4 and 20-50 wt% of Schwertmannite. The composite stabilizing reagent of the invention reacts with the dearsenization residues to obtain stabilized arsenic-containing minerals, has low toxicity leaching concentration, and can be stably stockpiled in strong acid-basic and strong reducing environments.

The invention discloses a method for restabilizing a heavy metal adsorption material, which comprises: a step of preparing schwertmannite, namely a step of synthesizing iron-based adsorbent schwertmannite SCH by a biological method; a step of preparing the heavy metal adsorption material, namely a step of preparing the heavy metal adsorption material with large loading capacity in an alkaline environment; a step of carrying out a photochemical restabilization reaction, namely a step of selecting a photochemical reaction device, setting related parameters of the photochemical reaction device, dissolving the heavy metal adsorption material into an organic acid solution for reaction under stable illumination intensity, carrying out interval sampling and analysis in the photoreaction process,repeating each step for three times, and drawing an error line. The invention further provides the photoreaction device for restabilizing the heavy metal adsorbing material, refixation of dissolved heavy metal can be promoted through cooperation of organic acid and ultraviolet light, the photoreaction device and the method have practical significance in solving the problem that the As content of underground water exceeds the standard, and improvement of the stability of Schwertmannite loaded with As is particularly important.