112 results about "Arsenite" patented technology

The present invention provides catalyst for selectively oxidizing methyl acrolein to synthesize methylpropenoic acid and its usage in catalyzing gas phase oxidation of methyl acrolein to synthesize methylpropenoic acid. The catalyst is one heteropoly acid salt containing Mo, P, K, Sb, Cu, As, etc., and has high catalytic activity and stability, long service life, methyl acrolein converting rate higher than 85 % and methylpropenoic acid selectivity over 87 % in the presence of molecular oxygen and diluting gas.

A method for removing arsenic species from an aqueous medium with modified zeolite minerals comprising providing an aqueous medium containing arsenic species in the form of both arsenate and arsenite, contacting the aqueous medium with an iron (II) laden zeolite mineral so that arsenic in the form of at least one of arsenate and arsenite contained in the aqueous medium can be adsorbed onto the iron (II) laden zeolite mineral forming an arsenic adsorbed iron (II) laden zeolite mineral, and separating the arsenic adsorbed iron (II) laden zeolite mineral from the aqueous medium.

The invention discloses a remediation device for arsenic-contaminated soil. According to the remediation device, tooth parts of semi-conical gears mesh with a first cone gear, a storage box is arranged at the upper end of the left side of a device body, the lower end of the first cone gear is fixedly connected to the upper end of a screw rod, the screw rod is connected to the upper end of the device body in a rotating mode through a bearing, the lower end of the screw rod I is connected to a sleeve in a threaded mode, the two sides of the sleeve are connected to guide grooves in a sliding mode, the guide grooves are fixedly connected to the side wall of the storage box, the lower end of the sleeve is fixedly connected to a compression roller, the bottom of the storage box communicates witha material guide pipe, the right side of a driving shaft is fixedly connected to a second cone gear, and the second cone gear meshes with a third cone gear. The remediation device has the advantagesthat the first cone gear is driven to rotate forward and reversely in a reciprocating mode through the toothed parts of the semi-conical gears so as to drive the screw rod to rotate forward and reversely, the screw rod drives the sleeve to move up and down in a reciprocating mode along the guide grooves under the action of threads so as to drive the compression roller to move up and down, the compression roller which moves up and down in a reciprocating mode drives a plug column to block the material guide pipe in a reciprocating mode so as to realize intermittent feeding, and meanwhile, the compression roller which moves up and down crushes soil blocks at the bottom of the storage box.

A method and apparatus for removing arsenic from water at point of entry or point of use particularly for residential application. The point of entry system comprises a first stage having a manganese greensand oxidizer to convert arsenite (As+3) present in the water to arsenate (As+5) and a second stage for passing the water through an anion exchange resin. Each stage includes a control head for automatic regeneration at a predetermined frequency. The manganese greensand is regenerated with a solution of potassium permanganate and the anion exchange resin is regenerated with a salt solution. An alternate embodiment for point of use application comprises a manganese greensand oxidizer cartridge to convert arsenite (As+3) to arsenate (As+5) followed by removal of the arsenate (As+5) with a reverse osmosis system.

The present invention relates to the use of arsenic compounds such as sodium meta arsenite (NaAsO2), arsenic trioxide (As2O3), and arsenic hexoxide (As4O6) or combinations thereof, for the treatment of painful, hyperalgesic and / or inflammatory conditions. The present invention also relates to compositions containing the above arsenic compounds for use in the treatment of pain, inflammation and immunological and autoimmune diseases and disorders.

Arsenic trioxide, an inorganic compound, is commercially available anti-cancer agent but it carries significant toxicity. Organic arsenicals, on the other hand, are much less toxic, to the extent that the methylation of inorganic arsenic in vivo into organic arsenicals has been considered a detoxification reaction. New organic arsenic derivatives have been synthesized, including S-dimethylarsino-glutathione, S-dimethylarsino-thiosuccinic acid and S-dimethylarsino-thiobenzoic acid, and established its potent in vitro cytotoxic activity against numerous human tumor cell lines, both of solid and hematological origin, as well as against malignant blood cells from patients with leukemia. Results form a basis for the development of S-dimethylarsino-glutathione, S-dimethylarsino-thiosuccinic acid, S-dimethylarsino-thiobenzoic acid, and other organic arsenicals as an anti-cancer therapy, combining high efficacy with very low, if any, toxicity.

The present application relates to pharmaceutical compositions and methods for treatment of urogenital diseases and bone metastasis in a human, which pharmaceutical composition contains an effective amount of arsenous acid alkaline or earth alkaline metal salt and / or a pharmaceutically acceptable adjuvant. According to the present invention, the alkaline arsenous acid metal salt is sodium meta-arsenita (AsO2Na) or potassium meta-arsenite (AsO2K). The effective amount of arsenous acid alkaline or earth alkaline metal salt is 0.0001-1500 mg / kg, preferably 1-1000 mg / kg, more preferably 1-150 mg / kg, and most preferably 50-100 mg / kg of body weight / day. The administration form of the pharmaceutical compositions of the invention is preferably oral, such as a tablet, capsule, powder and / or solution with a pharmaceutically acceptable carrier, diluent or excipient.

The invention discloses a novel normal-temperature arsenic removal agent and a preparation method and application of the novel normal-temperature arsenic removal agent. The arsenic removal agent comprises a supporter and a Cu-Ni active component loaded on the supporter, wherein the Cu-Ni active component is CuO and NiO, and the mass ratio of the supporter, CuO and NiO is 100: (1-10): (1-10). The preparation method comprises the following steps: (1) impregnating the supporter into soluble nickel salt aqueous solution, filtering to remove filtrate, and then drying and roasting sequentially to obtain a NiO loaded supporter; and (2) impregnating the NiO loaded supporter into soluble copper salt aqueous solution, filtering to remove filtrate, and then drying and roasting sequentially to obtain a CuO loaded supporter, that is, the arsenic removal agent. The arsenic removal agent can effectively remove inorganic arsenic in catalytic cracking gasoline, has a precision reaching 10ppb or less and has an arsenic loading capacity of 1.3% or more.

The present invention relates to a method of treating cancer in a subject in need thereof, by administering to the subject a combination of sodium meta arsenite and / or arsenic trioxide and a cytotoxic anticancer agent, such as cisplatin, adriamycin, and taxane, such as larotaxel, orataxel, tesetaxel, docetaxel or paclitaxel. The arsenic compound(s) and cytotoxic anti-cancer agent may be administered together in a composition or separately as a combination therapy.

A method is provided for the efficient stabilization, removal and disposal of arsenic-containing wastes generated in metal recovery processes that employ roasting techniques and the like. The conversion of the mostly trivalent arsenite compounds in the wastes to mostly pentavalent solid arsenate precipitates is accomplished by mixing the wastes with water and a ground iron-containing mineral, such as goethite, to form an aqueous slurry of wastes and ground iron-containing mineral, acidifying the slurry to a pH of less than about 1.0, treating the acidified slurry with oxygen gas in a pressurized vessel at a temperature higher than about 120° C. and providing an oxidation catalyst comprised of a water-soluble nitrate and a water-soluble iodide. The overall efficiency of the controlling chemical reactions is improved by the addition and use of the catalyst. The resulting solid arsenate precipitates, in the form of scorodite, are ideally suited for safe disposal with minimum or no further treatment. Unconverted soluble trivalent arsenic compounds remaining in solution may be converted and precipitated as additional scorodite by mixing and agitating the slurry with soluble iron salts under controlled conditions. The resulting precipitates meet or exceed environmental requirements for impoundment and safe disposal.

The invention provides a Bosea sp. AS-1 strain capable of tolerating pollution of arsenic and antimony and oxidizing As(III). The strain is preserved in the China Center for Type Culture Collection (CCTCC). The address of CCTCC is Wuhan university, Wuhan, China, and the postcode is 430072. The preservation date is April 11st, 2016. The preservation number is CCTCC No.2016190. The 16S rDNA sequence of the strain is represented by SEQ ID No.1. The provided strain is obtained by separating and screening, is capable of oxidizing As (III) into As (V), and thus greatly reduces the harm of As in the environment. The provided AS-1 strain has a strong oxidizing and adapting performance and can be used to treat arsenic pollution.

The invention discloses a method for screening trichoderma asperellum and application thereof. The method comprises the following steps of: collecting an arsenic pollution soil sample; separating fungi from the soil sample in a laboratory; purifying the fungi, and transferring the purified fungi to a selective culture medium of trichoderma; and culturing the fungi in different arsenic concentrations by taking a fungus strain of which the growth condition is the best on the selective culture medium as an object, and observing the growth condition of a bacterial colony and the tolerance of the bacterial colony on arsenic to screen the trichoderma asperellum.

The invention provides an arsenic-containing solid material comprising 100 parts by mass of a scorodite-type iron-arsenic compound and 1 part by mass or more of an iron oxidation compound, wherein the scorodite-type iron-arsenic compound is synthesized by adding an oxidizing agent to an acidic aqueous solution containing a pentavalent arsenic ion and a bivalent arsenic ion to cause the precipitation of the iron-arsenic compound to proceed while agitating the solution, and terminating the precipitation at a pH value of 1.2 or lower. The iron oxidation compound may be goethite, hematite, or a mixture thereof. It is preferred to use an iron oxidation compound having a BET specific surface area of 3 m<2> / g or more, preferably 20 m<2> / g or more.

The invention discloses a pathogen detection method, which relates to a pathogenic microorganism detection method. The invention provides the pathogen detection method, which utilizes genetically engineered phage to identify the pathogen simply, rapidly, sensitively and specifically. The pathogen detection method comprises the following steps: designing and synthetizing a nucleotide sequence with a cohesive terminus, wherein a coding of the nucleotide sequence is provided with 4-cysteine polypeptide; operably connecting the nucleotide sequence of which the coding is provided with the 4-cysteine polypeptide in an expressed regulatory sequence of the capsid protein of phage to form 4-cysteine recombinant phage; using the recombinant phage to infect host cells to make the recombinant phage reproduce in the host cells reproduce to generate recombinant cells with expressed 4-cysteine recombinant phage; and adding bi-arsine dye in the recombinant cells, removing nonspecific binding by washing and using a flow cytometry or a fluorescence microscope to carry out specific detection because the pathogen specifically identified and infected by the recombinant phage can emit specific fluorescence when being irradiated by exciting light.

The invention discloses a compound microbial soil remediation agent. The agent comprises an arthrobacter sp. LHM7719 agent, a Bacillus subtilis microbial agent and compound enzyme, wherein the compound enzyme comprises glyceraldehyde-3-phosphate dehydrogenase and beta-amylase. The invention also discloses a preparation method and an application of the compound microbial soil remediation agent. Thearthrobacter sp. LHM7719 is applied to the soil remediation field and can significantly reduce the content of heavy metals including arsenic, lead and cadmium in soil after being matched with Bacillus subtilis and glyceraldehyde-3-phosphate dehydrogenase and efficiently degrade petroleum hydrocarbon in the soil after being matched with the beta-amylase, so that the agent has good application prospects.

Arsenite inhibitory factor reporter gene plasmids, construction method and application thereof are disclosed. The arsenite inhibitory factor reporter gene plasmids are pLHPars9 and pLLPars9, the nucleotide sequences of which are shown in SEQ ID NO: 1 and SEQ ID NO: 2, respectively. The arsenite inhibitory factor reporter gene plasmids of the invention are very sensitive to arsenite, and the detection range is 0.04-50 [mu]M, which exhibits a wide dynamic detection range. Therefore, the arsenite inhibitory factor reporter gene plasmids of the invention can be used as biosensors for the detectionof arsenite. Furthermore, the arsenite inhibitory factor reporter gene plasmid pLHPars9 of the invention can be used for the detection of antimonite in addition to arsenite.

The invention discloses an arsenic sulfide waste residue recycling treatment method, which comprises the following steps: performing alkaline leaching to obtain sulfo-arsenite or sulfo-arsenate solution, filtering to remove waste residues through a filter, to obtain alkaline leachate, then performing oxidation desulfurization, so as to oxidize sulfo-arsenite or sulfo-arsenate into sulfo-arsenite or arsenate ions, then filtering and separating elemental sulfur through another filter to obtain arsenite or arsenate solution, recovering acid-base from the arsenite or arsenate solution by utilizing a bipolar membrane device, returning base solution for alkaline leaching and acid solution for crystalization and preparation of As2O3 or As2O5, performing electrodialysis or reverse osmosis concentration on residual liquor in a bipolar membrane salt chamber, returning concentrated liquor as inflowing water of the salt chamber of the bipolar membrane device, and draining or recovering fresh water. According to the arsenic sulfide waste residue recycling treatment method, the problems that for the traditional arsenic sulfide waste residue treatment method, consumption is large, the content of arsenic in effluent water does not reach the standard, the recycling rate is low, the technological process is complicated, secondary pollution exists and the like can be solved, the content of arsenic in effluent water reaches the standard, the recycling rate of As and S is high, the advantages of low consumption, low running cost, simple technological process and the like can be achieved.

The invention discloses a catalytic oxidation desulfurization catalyst and a preparation method thereof. The chemical formula of the catalytic oxidation desulfurization catalyst is (Cn-Cs-Cn)2 Y XM12O40), wherein Cn-Cs-Cn is a gemini surfactant, the spacer s is equal to 2 or 4 or 6, the alkyl chain n is equal to 14 o 16 or 18, the counter anion atom Y is a halogen atom, the heteroatom X is phosphorus or silicon or boron or iron or cobalt or arsenic or germanium, and the donor atom M is molybdenum or tungsten. The catalytic oxidation desulfurization catalyst not only is suitable for oxidation desulfurization of sulfur-containing organic matter, but also extends emulsion to the other organic synthesis fields, such as reactions of alkene epoxidation, alcohol oxidation, acid catalysis and isomerization. As long as the system is conducted in the oil-water two-phase, and the suitable heteropolyacid and the gemini surfactant with the suitable alkyl chain length and the suitable spacer length are adopted, the catalyst high in catalytic efficiency can be formed; after the reaction, the catalyst can be separated out through static demulsification; after the catalyst is recycled ten times, the catalytic efficiency can still be kept to be 95.7% of original catalytic efficiency.

The invention discloses a carbon quantum dot used for detecting arsenites, and a method used for detecting arsenites with the carbon quantum dot. The nitrogen sulfur-doped graphite-type carbon quantum dot (g-CNSQDs) is synthesized taking sodium citrate, urea, and aminoethyl mercaptan as templates, dithiothreitol (DTT) is used for surface grafting modification via hydrothermal cultivation so as to obtain a graphite-type fluorescent carbon quantum dot (SH-g-CNSQDs-NH2), wherein the surface of the graphite-type fluorescent carbon quantum dot (SH-g-CNSQDs-NH2) contains a large amount of mercapto groups and amino groups; combination of As (III) with SH-g-CNSQDs-NH2 is realized via the interaction of amino groups, mercapto groups, and arsenites, so that the fluorescence properties of SH-g-CNSQDs-NH2 are improved obviously, and detection on low concentration arsenites is realized. The carbon quantum dot contains no heavy metal; production cost is low; no toxic or side effect is caused; no secondary pollution on water quality samples is caused; operation is simple; and the carbon quantum dot can be used for sensitive and selective detection of low content As (III) water samples.

The invention discloses an organoarsenic compound. The organoarsenic compound has the following structural formula as shown in the specification, wherein n is 1 or 2; R, R1, R2, R3, R4 and R5 are respectively and independently amino, R6-CO-NH, R7-CO-O, alkyl, aryl, a heterocyclic substituent, alkoxyl, alkylamino, a halogen atom, nitro, hydroxyl or a hydrogen atom; R6 is alkyl, aminoalkyl or aryl;R7 is alkyl, aminoaryl or aryl. The organoarsenic compound has good inhibitory activity for thioredoxin reductase, has strong cytotoxicity for tumor cell HL-60, and can be used for preparing a thioredoxin reductase inhibitor or an antitumor drug with thioredoxin reductase as a target spot.

The invention discloses a direct vitrification arsenic fixation method for an arsenite-containing arsenic-containing material. The method comprises the following steps: arsenic precipitation: adding a pH regulator into an arsenic-containing solution, and separating soluble arsenite (salt) in the arsenic-containing solution in a precipitation form; mixing and burdening: uniformly mixing the arsenite-containing arsenic-containing material and a glass substrate according to a designed mass ratio, crushing and grinding; preheating treatment: preheating the mixture at 100-550 DEG C, collecting dust generated in the preheating treatment process, and returning the dust to the mixed ingredients; high-temperature melting: heating the preheated mixture to 1000-1400 DEG C for melting, collecting smoke dust generated in the high-temperature melting process, and returning the smoke dust to the mixed ingredients; and cooling: cooling the material obtained by high-temperature melting to form an arsenic-containing glass solidified body. According to the method, the technological process is shortened, the arsenic fixing cost is reduced, stable and harmless treatment of arsenic-containing waste residues is achieved, and the environmental pollution risk is reduced.

The present disclosure provides an iron-modified montmorillonite adsorbent for effectively removing heavy metals from water. The iron modified montmorillonite can be synthesized using a facile intercalation wet synthesis procedure that requires low energy and minimal use of chemicals. The iron modified montmorillonite adsorbent effectively removes heavy metals, such as arsenite, strontium, barium, phosphate, from water.

The invention relates to a determination method for inorganic arsenic in aquatic products. After being extracted by hydrochloric acid solution, the inorganic arsenic (1plus1) in the aquatic products passes through an anion-exchange column, and arsenite As (III), dimethyl arsenic compound DMA, methyl arsenic compound MMA and arsenate As (V) are eluted sequentially by mobile phase; owing to different adsorption capacities of the anion-exchange column on the arsenate As (V), the arsenite As (III), the methyl arsenic compound MMA, the dimethyl arsenic compound DMA and arsenic sugar AsS, the eluted solution is hydrogenated by borohydride potassium reducing agent and hydrochloride, and hydride is generated, enters an atomizer, and is subject to analytic determination by being combined with atomic fluorescence. The experimental condition is reasonably selected, and the detecting data is accurate and reliable and can not be influenced by extraction time and temperature. The determination method of inorganic arsenic in aquatic products of the invention not only can detect the inorganic arsenic iAs accurately, but also can determine the methyl arsenic compound MMA and the dimethyl arsenic compound DMA of the organic arsenic, and can be used for the morphometry of the arsenic in the aquatic products.

The invention discloses an aerobic arsenic methylation bacterium SM-1 of cytophagaceae and application of the arsenic methylation bacterium. A gram-negative bacterium, which is quite strong in arsenic methylation and volatilization capacities, is obtained through isolation and identification; and the strain belongs to a new genus and a new species of the cytophagaceae, which is named as arsenicibacter palustris SM-1 and preserved in China Center for Type Culture Collection on October 15, 2014 with preservation number of CCTCC M2014457. Compared with the prior art, the bacterium disclosed by the invention has the following beneficial effects: the provided bacterium strain is quite strong in arsenic methylation and volatilization capacities; and the strain is applicable to arsenic pollution remediation of paddy soil and is capable of finally relieving the damage from arsenic pollution in a paddy field.

The invention provides a concentration method of arsenic in arsenic-containing wastewater. The concentration method comprises the following steps: mixing the arsenic-containing wastewater with divalent ferric salt for precipitating the arsenic to obtain a mixed system, wherein the pH value of the precipitated arsenic is 2 to 7; performing solid-liquid separation on the mixed system to obtain a solid product; adding an acid into the solid product for dissolving. By adopting the concentration method provided by the invention, the arsenic-containing wastewater is reacted with the divalent ferric salt under the condition of the proper pH value, the arsenic is precipitated in the form of ferrous arsenate or ferrous arsenite, and the acid is added into the ferrous arsenate or the ferrous arsenite for re-dissolving, so that the arsenic is enriched and concentrated, and a high-concentration arsenic-containing solution is obtained. As proved by embodiments, by adopting the concentration method provided by the invention, the high-concentration arsenic-containing solution can be obtained, the arsenic content of the arsenic-containing solution can be adjusted easily, and further stabilization treatment on arsenic-containing waste liquid is facilitated.

The object of the invention is the plasmid pSheB, particularly a plasmid which may comprise a fragment of pSheB including the arr module and functional derivatives thereof, and strains containing such a plasmid, preferably the Shewanella sp. strain, deposited as KKP 2045p, which are capable of removing arsenic by dissolution of minerals and reduction of arsenates to arsenites. The object of the invention is also the method and the use of such bacterial strains or compositions which may comprise them, for the selective removal of arsenic from mineral resources, raw materials industry waste or soil.

The invention discloses a method for removing arsenic in calcium-rich high-arsenic groundwater by using biochar, belonging to the field of arsenic pollution treatment for groundwater. The method comprises the following steps: adding biochar into alkaline calcium-rich high-arsenic groundwater, and carrying out a stirring reaction for at least 4 hours to remove arsenic dissolved in the groundwater,wherein the concentration of arsenic contained in the groundwater is 0.1-10 mg / L, and the concentration of calcium ions is 20-2000 mg / L. According to the invention, the specific calcium-rich high-arsenic groundwater is used as the object in which arsenic is to be removed; oxidizing active groups on the surface of the biochar are employed to oxidize low-valent arsenite in the groundwater into high-valent arsenate, and the generated arsenate reacts with the calcium ions and biochar to formation an arsenic-calcium-biochar precipitate; so the characteristic that the groundwater is rich in calciumand is alkaline is fully utilized, oxidation and adsorption means are organically combined to achieve the purpose of integrated removal of arsenic from the groundwater, and the method can effectivelysolve the common problems of low efficiency, high operating cost, complicated operation and the like in conventional methods for removing arsenic in groundwater.

The invention relates to a strontium alginate gel bead product coated with hydrous zirconium oxide and an adsorption application of the strontium alginate gel bead product. A hydrous zirconium oxide dispersion liquid is mixed with a sodium alginate water solution according to a certain volume ratio, then the obtained mixture is dropwise added into a strontium salt solution, stirring is carried outto form gel beads, and water washing is carried out to remove excess strontium ions, so that the hydrous zirconium oxide / strontium alginate composite gel beads with a particle size of 0.1-5 mm are obtained. The gel beads can be used for adsorbing and removing anionic pollutants in water. The Langmuir saturated adsorption capacities of the composite gel beads to phosphate micro-polluted water, fluoride micro-polluted water and arsenite micro-polluted water can respectively reach 53 mg / g, 36 mg / g and 61 mg / g. According to the invention, the separation problem of hydrous zirconium oxide can be solved while high adsorption activity of the hydrous zirconium oxide is ensured, and a certain potential application value is achieved in the field of water purification.