83 results about "Anion binding" patented technology

A novel coordination complex formed by dinuclear metal complexation is provided. The complex is a dinuclear metal complex of a compound, wherein the compound comprises a conjugation ring system substituted with: a) an electron donating group selected from —OH, —SH and —NH₂; b) an indicating group selected from a chromogenic group, a fluorescent group and an electrochemical group; and c) two binding auxiliary groups, in combination with the electron donating group each of which being coordinated with the metal to provide an anion bonding site, wherein as the complex binds to a anion, the coordination of the electron donating group with the metal is weakened and electron donation of the electron donating group to the conjugation ring system is reinforced such that the reinforced electron donation by the electron donating group is transferred through the conjugation ring system to the indicating group to produce an indicating signal concomitant with the change of its electronic density. The coordination complex shows high sensitivity and high selectivity for pyrophosphate over other anions in an aqueous solvent over a wide pH range. Therefore, the complex is useful for pyrophosphate assay as a pyrophosphate sensor.

Anion-binding polymers are described. The anion-binding polymers in some cases are low swelling anion-binding polymers. In some cases, the anion-binding polymers have a pore volume distribution such that a fraction of the polymer is not available for non-interacting solutes above a certain percentage of the MW of the target ion for the polymer. In some cases, the anion-binding polymers are characterized by low ion-binding interference, where the interference is measured in, for example, a gastrointestinal simulant, relative to non-interfering buffer. Pharmaceutical composition, methods of use, and kits are also described.

The invention provides a device for coprocessing heavy metal waste water and organic waste water and generating electric power. The device comprises an electrolytic cell which is separated into an anode chamber and a cathode chamber by a bipolar membrane, wherein an anode and a cathode are respectively arranged in the anode chamber and the cathode chamber, the anode and the cathode are connected with a resistor through a lead, the anode is composed of electric power generating microbes and an anode substrate, the cathode is made from metallic titanium with electrochemical inertia or carbon materials, the anode chamber contains the waste water containing organic pollutants, and the cathode chamber contains the heavy metal waste water. According to the invention, the organic pollutants are oxidized into carbon dioxide by the electric power generating microbes attached to the anode in the same electrochemical cell, and electrons and protons can be simultaneously released, the protons can combine with hydroxyls dissociated from the bipolar membrane to generate water, while the electrons can be transmitted to the cathode by an external circuit, the electrons can reduce the heavy metal in the heavy metal waste water to metal elementary substances and the metal elementary substances deposit on the surface of the cathode, and the protons dissociated from the bipolar membrane can combine with negative ions to generate acid or can be neutralized to water in the cathode chamber.

A nucleic acid coating composition including a polyanion bound, directly or through one or more intermediates, to a medical device surface, with a condensate comprising a polycation and nucleic acid bound to the polyanion, devices incorporating such coating compositions, and methods for making. In one embodiment, a silyl-heparin complex is provided, bound to a medical device surface by hydrophobic interaction with the silyl moiety, with a polycation and nucleic acid condensate bound to the heparin by electrostatic interaction.

The invention relates to an elution-method soil remediation process. The process comprises the steps of feeding, performing preliminary screening separation, performing fine screening separation, performing acid mixing pool oxidization, performing solid-liquid separation, reducing metal ions, precipitating metal ions, flocculating organic insoluble substances, performing precipitation separation and performing filter pressing treatment. The process has the beneficial effects of adopting preliminary screening eluting and fine screening eluting for separating heavy metal ions and other pollutants into water from soil, combining the metal ions and anions in acid through oxidization in two-stage acid mixing pool, dissolving the mixture in water, performing centrifugal separation, reducing pollutant-containing water through an alkali pool, reacting the water and hydroxyl to separate precipitates from sewage, flocculating the precipitates and settling the precipitates in a four-stage settling pond for solid-liquid separation, wherein the separated water can be recycled to be used for preliminary screening eluting and fine screening eluting, the pollutant-containing solids are discharged and then fed into a filter press for filter pressing recovery, and water, which is generated in the filter pressing process and contains a few of pollutants, is fed back to a sewage pool for treatment and separation again.

The invention relates to the field of non-ferrous metallurgy and resource recycling, in particular to a novel process for extracting vanadium from vanadium-containing waste catalyst reductive organic acid. The novel process comprise the steps that a vanadium-containing waste catalyst is directly extracted in a reductive organic acid system, and other reductive agents are not added, so that pentavalent or tetravalent vanadium is directly reduced into vanadium-oxygen-based ions or trivalent vanadium ions, the vanadium-oxygen-based ions or the trivalent vanadium ions are combined with organic acid radical anions and enter a solution, and vanadium-containing leaching liquid and vanadium-containing leaching slag are obtained; and ammonia water is added into the vanadium-containing leaching liquid to adjust pH so that ammonium vanadate can be formed and precipitated, and after separating is conducted, a vanadium pentoxide product is obtained by calcining precipitation slag. According to the novel process for extracting the vanadium from the vanadium-containing waste catalyst reductive organic acid, the vanadium is extracted by adopting the reductive organic acid system; the extracting condition is mild; the vanadium extracting rate is 95% or above and higher than the direct inorganic acid fluid extracting rate; and other impurity ions are not introduced in the extracting process, so that recycling of other metal elements in the waste catalyst is not affected.

Anion-binding polymers are described. The anion-binding polymers in some cases are low swelling anion-binding polymers. In some cases, the anion-binding polymers have a pore volume distribution such that a fraction of the polymer is not available for non-interacting solutes above a certain percentage of the MW of the target ion for the polymer. In some cases, the anion-binding polymers are characterized by low ion-binding interference, where the interference is measured in, for example, a gastrointestinal simulant, relative to non-interfering buffer. Pharmaceutical composition, methods of use, and kits are also described.

The invention belongs to the technical field of electrochemical synthesis and relates to a preparation method for tetra-alkyl ammonium hydroxide. A three-film four-chamber electrodialysis device is adopted, and tetra-alkyl ammonium salt serves as raw material to prepare the tetra-alkyl ammonium hydroxide. Firstly, a tetra-alkyl ammonium salt aqueous solution, pure water, anolyte and an acid solution are added to a salt chamber, a cathode chamber, an anode chamber and an acid chamber respectively, power is turned on, tetra-alkyl ammonium cations penetrate a first cation film to enter the anode chamber, anions penetrate an anion film to enter the acid chamber; the anolyte is electrolyzed to generate O2 and cations H+, and the H+ combine with the anions coming out of the salt chamber to generate anolyte after the H+ enter the acid chamber; and water molecules is electrolyzed at a negative plate to form H2 and anions OH-, and the anions OH- combine with the tetra-alkyl ammonium cations to form a tetra-alkyl ammonium hydroxide solution. The preparation method is simple in process, convenient to operate, scientific in principle, low in cost, environmentally friendly, and capable of being applied to large-scale industrial production easily.

The present invention provides complete equipment for soil remediation by a leaching method. The complete equipment includes a screw conveyor, a preliminary screening separator, a fine screening separator, an acid-added blending tank, a centrifugal separator, a cesspool, an alkali-added blending tank, a sedimentation basin and a filter press. Heavy metal ions and other pollutants are separated from soil to water by adopting preliminary screening and leaching, and fine screening and leaching. The metal ions are combined to anions of an acid solution by a two-stage acid pool oxidation, and the combined products are dissolved in water. The water containing the pollutants and mud, from which the pollutants are removed, are separated by the centrifugal separator. The water containing the pollutants is reduced in the alkali pool, then reacts with hydroxyls, and is separated from the sewage in the form of precipitates. The precipitates, after being flocculated, enter the four-stage sedimentation basin, and are subjected to solid and fluid separation. The separated water is recycled and used for the preliminary screening and leaching. The process design is reasonable. The processing effect is good, and the processing cost is low. The process is widely used.

Described herein are compositions and methods useful for the purification of aqueous fluids using dendritic macromolecules. The process involves using dendritic macromolecules (dendrimers) to bind to or chemically transform solutes, and a filtration step to produce fluid from which solutes have been removed or chemically transformed. Examples of dendrimers that may be used in the process include cation-binding dendrimers, anion-binding dendrimers, organic compound-binding dendrimers, redox-active dendrimers, biological compound-binding dendrimers, catalytic dendrimers, biocidal dendrimers, viral-binding dendrimers, multi-functional dendrimers, and combinations thereof. The process is readily scalable and provides many options for customization.

The invention relates to a high-efficiency sewage treatment flocculating agent, which is prepared by mixing four monomers, namely acrylamide AM, acrylic acid AA, diallyldimethylammonium chloride DAC and acryloyloxyethyl trimethylammonium chloride AEAAC, according to the mol ratio of 30:20:10:40. The flocculating agent disclosed by the invention is an amphoteric ionic polymer flocculating agent, and has the flocculating effect superior to like products; besides a macromolecular bridging action, the flocculating agent has action mechanisms as follows: an anion base on a macromolecular chain is bonded with a metal ion on an activated surface, but cation is bonded with anion on the activated surface, therefore, the flocculating agent disclosed by the invention can be used in a large pH value range; the bonding and flocculating effect is increased; the flocculating agent can be used for flocculating in the event of being proper and protecting in the event of being excessive without damaging; and, when the flocculating agent is used for treating sewage, the advantages of higher water filter amount and lower moisture content of a filter cake are obtained.

The invention relates to preparation of a silicon dioxide microsphere with a nonionic/anionic-combined-type surfactant as a soft template and belongs to preparation of silicon dioxide hybridized microspheres. The invention discloses a miktoarm star segmented copolymer with polyhedral oligomeric silsesquioxane as a core, which is prepared through polymerization in a manner of reversible addition-fragmentation chain transfer. The copolymer contains a hydrophilic poly(methoxyl polyethylene glycol acrylate) segment, a hydrophobic polymethyl methacrylate segment, a hydrophobic polystyrene segment, and the polyhedral oligomeric silsesquioxane core. The preparation of the mesoporous silicon dioxide material mainly includes a step of selectively volatilizing tetrahydrofuran with the miktoarm star segmented copolymer as the soft template, tetraethoxysilane as a silicon source and a tetrahydrofuran/hydrochloric acid solution as a mixture solvent. The silicon dioxide microsphere can form a robust spherical micelle, wherein the core is the polyhedral oligomeric silsesquioxane coated by the hydrophobic segments and an external layer is a comb-shaped PEGMEA chain segment. The silicon dioxide microsphere is 100-150 nm in diameter and can be used in a coating for improving anti-static, anti-adhesion and dispersing properties.

The present invention discloses a polyanion-like lithium ion battery layered positive electrode material and a preparation method thereof. The polyanion-like lithium ion battery layered positive electrode material has a chemical formula of LiM(AO4)xO2-delta, wherein x is more than 0 and is less than 1, delta is more than 0 and is less than 2, M is LiaNibCocMn1-a-b-c, a is more than or equal to 0 and is less than 1, b is more than or equal to 0 and is less than 1, c is more than 0 and is less than or equal to 1, a+b+c is less than or equal to 1, and A is one or a plurality of materials selected from P, S and Si. According to the present invention, the solid-phase method, the co-precipitation method and the sol-gel method are adopted to combine the layered structure and the polyanion to prepare the polyanion-like type lithium ion battery layered positive electrode material, and the polyanion-like type lithium ion battery layered positive electrode material has high specific capacity and good stability compared with the current layered material.

The invention provides a novel ceramic-metal oxide-polymer composite material. A functionalized metal oxide nanolayer coating can be bonded between LICGCs and polymers/oligomers, which protects the LICGC from corrosion, has a low interfacial resistance to Li⁺ migration, and can be a SIC. Hybrid ceramic-polymer electrolytes were formed by engineering the interface between a LICGC and a polymer, polyethylene oxide (PEO), by sputter coating a 200 nm thick SiO₂ layer onto a lithium ion conducting glass ceramic (LICGC) and silanating the SiO₂ with a functionalized PEG in the presence of LiTFSI. A low interfacial resistance (R_interfacial) was measured, the same as that obtained for a SiO₂ interface soaked with liquid tetraglyme/LiTFSI. The pegylated SiO₂ interface (unlike the tetraglyme/LiTFSI interface) protected the LICGC from corrosion by Li⁰ metal. The (PEG-LiTFSI)-SiO₂-LICGC could be bonded with polyethylene oxide/LiTFSI. This procedure provides a general method to bond other LICGCs to PEO-based polymers, and to incorporate other functionalities such as single ion conductivity into the interface via the incorporation of coupling agents with pendant anions.

The invention relates to a method for reducing the content of protein in sodium hyaluronate prepared by a bio-extraction method. At present, a comb extract method for producing the sodium hyaluronate usually comprises the following steps: coarse cleaning, fine cleaning and grinding, enzymolysis, primary adsorption, CPC precipitation and dissociation, secondary adsorption, alcohol precipitation, and drying to obtain sodium hyaluronate crude drug. According to the method, after performing the CPC precipitation and dissociation, purified water is added to a dissociation solution, so that the ion strength of the dissociation solution is reduced; based on the quaternary ammonium salt complex-precipitation dissociation principle, positive ions on a quaternary ammonium group is free under the low salt concentration and is combined with negative ions on a mucopolysaccharide molecule to form a quaternary ammonium complex, and the quaternary ammonium complex is gradually dissociated under the high salt concentration. By virtue of the reversible reaction, precipitates in the dissociation solution are repeatedly complexed, and then are subjected to the steps of rinsing, secondary dissociation, filtering, alcohol precipitation and drying so as to obtain the sodium hyaluronate crude drug. According to the method, the content of protein in the sodium hyaluronate can be remarkably reduced.