91 results about "Arsenite ion" patented technology

The spectroscopic and photophysical properties of fluorescent probes comprising donor-acceptor derivatives comprising the boric acid group or a derivative of boric acid, B(OH)3 (or borate ion, BO(OH)2<-1>), arsenious acid, H3 AsO3 (or arsenite ion, H2AsO3<-1>), telluric acid, H6TeO6 (or tellurate ion, H5 TeO6<-1>) or germanic acid, Ge(OH)6 (or germanate ion, GeO(OH)3<-1>) are described. Method of using said probes are also provided.

The invention relates to a cellulose base/Fe3O4 composite adsorption material used for removing arsenic in water and a preparation method thereof. According to the invention, with fibers or powder of natural cellulose or fibers of a cellulose derivative as a cellulose matrix material for the composite adsorption material, in an alkaline water system provided by ammoniacal liquor, Fe3O4 particles are loaded on the surface of the cellulose matrix material through in-situ co-precipitation, and the loaded Fe3O4 particles enable the obtained cellulose base/Fe3O4 composite adsorption material to have magnetism and to be easily removed from water, and allow harmful ions like arsenate ions and arsenite ions in water to be absorbed. Compared to arsenic removal materials in the prior art, the invention has the following characteristics: a natural biomass is used as an adsorption carrier, and the natural biomass is cheap and highly efficient, enables the content of arsenic in water to be substantially lower than a national standard and is easy to remove and convenient to use.

The present invention discloses a preparation method and applications of a lanthanum-loaded biochar arsenic-removing adsorbent. The preparation method mainly comprises: washing corn stalks, remove impurities, carrying out air-drying, crushing, screening, carrying out stirring mixing on the corn stalk powder and a lanthanum chloride solution under a certain condition, adjusting the pH value to the alkaline state, removing excess chlorine ions from the solution, and carrying out anoxybiotic calcination on the mixture for a certain time at a certain temperature so as to prepare the nanometer lanthanum oxide-loaded biochar material. According to the present invention, the prepared lanthanum-loaded biochar can be used for treating pentavalent arsenic ions in wastewater, and has characteristics of simple preparation, low cost, high adsorption efficiency, good application prospect, and the like.

The invention discloses an adsorbing material for removing arsenic from water and a preparation method of the material. The preparation method comprises the steps as follows: certain amounts of cerous salt and ferric salt are dissolved in appropriate water, hydrogen peroxide is taken as an oxidizing agent, and cerous ions are oxidized; and an alkali liquid is taken as a precipitator, a coprecipitation reaction happens, and drying is performed at a certain temperature, so that the amorphous ferric hydroxide adsorbing material loaded with nano cerium oxide is obtained. The arsenic-removing adsorbing material has a strong absorption action on arsenic ions in the water, and is simple in preparation process and low in cost; when arsenic in a water solution is processed, water is not required to be preprocessed; and the material can be applied to removing of arsenic in drinking water or industrial wastewater.

The invention provides a method for preparing an arsenic adsorbent. The arsenic adsorbent has zirconium oxide of nano-pore structure. The material can effectively treat arsenate and arsenite in the waste water, and can be recycled after waste water treatment. Another objective of the invention is to provide a method for treating waste water containing arsenate or arsenite ions by the arsenic adsorbent prepared by the method. The method contains a 'regeneration' step, so that the arsenic adsorbent can be reused cyclically.

The invention discloses an arsenic removing water purification treatment method and belongs to the technical field of water purification treatment. Arsenic in water exists in two main valence states including tervalence (arsenite ions) and pentavalence (arsenate ions), wherein the pentavalent arsenic can be removed by an iron salt flocculating agent, but the tervalent arsenic cannot be removed by the iron salt flocculating agent. According to the process, potassium hypermanganate is used for pre-oxidizing, and the iron salt flocculating agent and an auxiliary flocculating agent are added together; the arsenic in raw water is removed by a coagulant sedimentation method; finally, tiny floc, which is not settled and is adsorbed by the flocculating agents, is further intercepted by quartz sand filtering or an immersing type ultrafiltration membrane, so that the content of the arsenic in the output water reaches 0.1 microgram per liter.

The invention discloses a novel arsenic aptamer nucleic acid sequence. The novel arsenic aptamer nucleic acid sequence is ACA GAA CAA CCA ACG TCG CTC CGG GTA CTT CTT C. The novel arsenic aptamer nucleic acid sequence is relatively short; synthesis is simple; cost is low; and auxiliary reagents such as nanogold and sodium chloride are easily available. In detection of arsenic ions, colorimetric method is adopted, a cheap spectrophotometer can be used for detection, equipment cost and reagent cost are both lower than that of conventional Ars-3 aptamer detection system, and the novel arsenic aptamer nucleic acid sequence is more suitable for rapid detection.

The use of two mercury and arsenic removal media: A) a sulfur-impregnated organoclay; and B) a coupling agent-reacted organoclay, wherein the coupling agent preferably contains a mercapto, disulfide, tretrasulfide and/or polysulfide end group provides mercury removal media having increased reactivity, stability, and synergistic mercury removal ability. The preferred mercury removal media described herein is prepared by reacting an organophilic clay containing onium ions A) with elemental sulfur; and B) with a sulfur-containing coupling agent, preferably containing a mercapto, disulfide, tetrasulfide, and/or polysulfide moiety.

The invention discloses an iron-loaded cotton fiber material with absorbent cotton fiber as basic skeleton and a preparation method thereof, belonging to the technical field of macromolecular material. The fiber material structurally contains the hydroxide of amorphous iron. The preparation method thereof comprises the steps of: taking the absorbent cotton fiber as the basic skeleton, loading ferric iron salt solution through dispersion and hydrolysis so that the structure of the fiber contains the hydroxide of amorphous iron. The reaction process is simple, the conditions are moderate, and the reaction agents adopted are nontoxic and environmentally-friendly. The fiber material keeps fibrous shape of the absorbent cotton fiber, has stable performance in air, and causes no pH change of water when being used as adsorbent in the water, and the iron-loaded shape of the adsorbent is stable so that arsenite ions in the water can be adsorbed effectually.

The invention provides an adsorbent for efficiently removing arsenite ions from water, and a preparation method thereof, and relates to an adsorbent for efficiently adsorbing arsenite ions in water, and a preparation method thereof. In the prior art, the removal efficiency of the arsenite ions in the wastewater solution is not high. A purpose of the present invention is mainly to solve the problemin the prior art. According to the technical scheme, a metal complex CuxMn6-xLa2(OH)18.4H2O or CuxMn6-xFe2(OH)18.4H2O as an adsorbent is prepared by combining co-precipitation and hydrothermal treatment, and x is 2-5. With the technical scheme, the problem in the prior art is well solved. According to the present invention, the adsorbent prepared by the method can efficiently remove arsenite ionsfrom water, and can be used in the field of environmental protection.

The invention discloses a composite adsorption material for removing arsenic ions from natural water and a preparation method for the adsorption material. Modified spent grains and a hydroxyl iron ion solution are used as raw materials. The method comprises the following steps of: adding spent grains subjected to high temperature treatment into a Ca(OH)2 solution for reacting, gelatinizing, aging, washing by using water and absolute ethanol, performing suction filtering, putting into a muffle furnace for firing, cooling, adding distilled water to prepare suspension, adding the hydroxyl iron ion solution, stirring, standing, washing a lower precipitate, drying, and grinding to obtain the adsorption material which has high adsorption property and can be strongly combined with the arsenic ions in the water. The preparation method is innovative, novel and unique, and the prepared material has a good adsorption effect on the arsenic ions in the water.

The invention discloses a preparation method of biomass waste activated carbon. The preparation method comprises the following steps: (a) grafting the surface of biomass wastes with 2-acrylamido-2-methyl-1-propanesulfonic acid; and (b) carbonizing the biomass wastes treated in step (a) to obtain the activated carbon. Compared with like products in the prior art, the biomass activated carbon prepared by the method has good adsorption capacity, reaching 480 mg/g or above, on p-nitrophenol, can almost completely remove lead ions, chromium ions, nickel ions and arsenic ions in water, has a good cycling stability, can still keep the adsorption capacity at 98% or above after being cycled for 5 times or above, and is a multifunctional comprehensive wastewater adsorbent.

The invention provides an ultrafine arsenic removal adsorbent and a preparation method thereof, and an arsenic removal method. The preparation method comprises: adding a surfactant into a solution containing Ca<2+>, Al<3+> and SO4<2->, then adjusting the pH to 10.6-12.9; and carrying out a heating stirring reaction, filtering, washing, and drying to obtain the ultrafine arsenic removal adsorbent.The ultrafine arsenic removal adsorbent prepared by the invention is monosulfur hydrated calcium sulphoaluminate (AFm), has a chemical formula of 3CaO.Al2O3.CaSO4.nH2O, belongs to a trigonal system, and is of a layered structure. Compared with the arsenic removal adsorbent in the prior art, the arsenic removal adsorbent of the invention has the following characteristics that the raw materials areeasy to obtain, the coat is low, arsenic ions in domestic water are adsorbed through solid, a solidified product formed after adsorption removal is still solid and is easy to separate, and the arsenicremoval adsorbent is environmentally friendly and free of secondary pollution. The prepared ultrafine arsenic removal adsorbent is solid, is convenient to transport, convenient to use and easy to popularize, and can be used in daily life of residents.

The invention relates to construction of a sensitive arsenic ion whole cell biosensor and an arsenic ion concentration detection method. The sensor detection plasmid and the reporter plasmid are recombinant. The detection plasmid consists of an arsenic-specific protein regulatory promoter Pars, an arsenic-specific binding protein ArsR gene, and a self-feedback regulatory protein gene luxR. The reporter plasmid consists of a self-feedback promoter PluxRI, a red fluorescent protein mCherry gene and a self-feedback regulatory protein gene LuxR. By introducing a positive feedback amplification system based on the variant LuxR protein as a regulatory element, the sensitivity of the sensor is increased by 20 times to 0.1 micron, and the specific signal ratio is increased by 1.5 to 7.5 times. Thearsenic ion biosensor takes Escherichia coli DH5 as a host cell, has high sensitivity and specificity for arsenic ion detection, is not interfered by other metal ions, and has wide adaptability.

The invention discloses a modified silk-screen printing electrode and an application thereof. Printing raw materials of an electrode carbon layer comprise carbon paste, a carbon-based nano material and an oxalic acid, the mass fraction of the carbon-based nano material is 0.3-0.5%, the mass fraction of the oxalic acid is 1-1.6%, and the balance is the carbon paste; and gold nanoparticles are deposited on the surface of a working electrode of the electrode. When the modified screen-printed electrode is used for detecting a content of trivalent arsenic ions, an electrochemical signal can be effectively improved, and the enrichment capacity of the trivalent arsenic ions on the surface of the electrode can be increased; and during use, the detection cost is low, the sensitivity is high, dependence on large instruments and professional operators is avoided, and the application range is wide.

The invention relates to a method for treating heavy metal wastewater by a superconductive HGMS-NZVI (high gradient magnetic separation-nanoscale zero valent iron) coupled technique, belonging to the fields of resources and environments. The result proves that the optimal technological parameters of the superconductive HGMS-NZVI coupled technique are as follows: the addition amount of NZVI is 0.05-0.5 g/ml, the magnetic gradient is 3-5T, the standing time is 1-15 minutes, and the distance i between the reaction tank diameter d/magnetic field generator and the reaction tank wall is less than 3. The 4878.62ml of arsenic can be removed from every liter of high-concentration arsenic wastewater, and the removal ratio of arsenic ions in the wastewater is up to 99.56%. The operating method comprises the following steps: adding a right amount of NZVI into the heavy metal wastewater, uniformly stirring, injecting the wastewater in the reaction tank in a superconductive high-gradient magnetic field, and standing for some time. Before the treatment, no pretreatment is needed, and the pH value of the wastewater is not regulated. Under the technological conditions of the superconductive HGMS-NZVI coupled technique, the saturation adsorption quantity of NZVI is 16-18 mg/g (the arsenic ion adsorption quantity of 1g of NZVI), and the technological parameters can be properly regulated according to the arsenic ion concentration characteristic of wastewater.

The invention discloses a sulfydryl-modified cyan fluorescent carbon quantum dot and application thereof in rapid detection of arsenic ions, and the quantum dot is brown solid powder which is synthesized by taking tartaric acid and cysteine as raw materials through hydrothermal reaction and has the size of 4-10nm. The maximum excitation wavelength of the quantum dot is 320 nm, the maximum emission wavelength is 405 nm, and the quantum dot has good water solubility, light stability and biological compatibility. Under the condition of a PBS buffer solution system, the quantum dot can realize rapid detection of metal arsenic ions by utilizing fluorescence intensity change, and has the advantages of simplicity in operation, high sensitivity, good specificity, low detection limit, high stability, rapid response, good repeatability and the like, and the detection limit of the arsenic ions is 0.03 ppb. The preparation method of the quantum dot is simple, high in operation repeatability and low in cost, can be put into industrial production, and has a wide application prospect.

The invention relates to a method for treating heavy metal wastewater by a superconductive HGMS (high gradient magnetic separation)-FeOOH coupled technique, belonging to the fields of resources and environments. The superconductive HGMS-FeOOH coupled technique for treating heavy metal wastewater has the advantages of simpler operation and higher treatment efficiency than the single absorption technique. The result proves that the superconductive HGMS-FeOOH coupled technique has favorable treatment effect under the conditions of the optimal technological parameters; and the removal rate of arsenic ions from high-concentration arsenic wastewater can reach higher than 77.12% under the following conditions: the addition amount of FeOOH is 0.1-0.9 g/ml, the magnetic gradient is 3-5T, the standing time is 1-15 minutes, and the distance i between the reaction tank diameter d/magnetic field generator and the reaction tank wall is not greater than 3. Before the treatment, no pretreatment is needed, and the pH value of the wastewater is not regulated. Under the technological conditions of the superconductive HGMS-FeOOH coupled technique, the saturation adsorption quantity of FeOOH is 6.5-7.5 mg/g, and the technological parameters can be properly regulated according to the arsenic ion concentration characteristic of wastewater.

The invention relates to a treatment method of arsenic-containing organic wastewater, which comprises the following steps: (1) regulating the pH value of the arsenic-containing organic wastewater to 2-4, and enabling the pH-regulated wastewater to flow through a nano-iron particle generation device, so that the nano-iron particle generation device generates nano-iron particles in situ in the wastewater; (2) adding H2O2 into the wastewater added with the nano-iron particles to carry out nano-iron/heterogeneous Fenton oxidation reaction until the reaction is finished; and (3) adjusting the pH value of the reacted mixed solution to 8-9, and separating out the arsenic ion flocculent precipitate from the wastewater. The treatment method provided by the invention has good arsenic removal and CODremoval effects on arsenic-containing organic wastewater, and can meet increasingly strict arsenic discharge standards.

The invention relates to a method for removing arsenic ions in water by modifying graphene electrodes with N elements, comprising the following steps: preparing nitrogen-doped graphene airgel, preparing nitrogen-doped graphene airgel paper electrodes, and adjusting the voltage on the electrodes to water Adsorption and desorption of heavy metal ions. The beneficial effects of the present invention are: the preparation method of nitrogen-doped graphene airgel is simple and easy, and the preparation process is environmentally friendly and pollution-free; the electrode modified with this material has high adsorption efficiency, fast speed, and simple operation for heavy metal ions in water; Compared with conventional materials, the recycling performance has been greatly improved.

The invention discloses a method for extracting and separating arsenic and iron in a chloride system, and belongs to the technical field of chemical solvent extraction. The method comprises the stepsof firstly, arsenic extraction, wherein a prepared organic phase is in contact with a hydrochloric acid solution containing iron and arsenic to be subjected to single-stage or multi-stage counter-current extraction, arsenic irons are selectively extracted into the organic phase, and most iron ions are left in extraction raffinate; secondly, arsenic reverse extraction, wherein an arsenic-containedloaded organic phase is in contact with a dilute inorganic acid water solution to be subjected to single-stage or multi-stage counter-current reverse extraction, and a blank organic phase and arsenic-rich strip liquor after reverse extraction are obtained; and thirdly, returning of the blank organic phase after reverse extraction to the first step to be repeatedly used, wherein the arsenic-rich strip liquor is used for further preparing an arsenic compound. The organic phase is formed through mixing of an extraction agent and a diluting agent, the extraction agent is a neutral alcohol extraction agent, and is on or combination of multiple of n-caprylic alcohol, isooctyl alcohol and sec-octyl alcohol, the flow is short, the arsenic recycling rate is high, the chemical reagent consumption islittle, cost is low, and industrialization is easily achieved.

The invention relates to a method for removing arsenic in waste acid by using a ferroferric oxide/kaolin nano composite material, and belongs to the technical field of heavy metal pollution treatment.A mixture (A) containing Fe3O4 is prepared from FeCl3.6H2O and FeSO4.7H2O; the Fe3O4/kaolin nano composite material is prepared from the mixture (A) containing Fe3O4 and a kaolin nano material; and the Fe3O4/kaolin nano composite material reacts with waste acid to remove arsenic in the waste acid. Fe3O4 is loaded on the surface of a kaolin nanotube, so that Fe3O4 is better dispersed, and more arsenic ions can be adsorbed.