16 results about "EDDS" patented technology

The invention discloses a perovskite solar cell based on a multi-site chelate ligand and a preparation method thereof. The cell comprises an ITO conductive glass layer, a hole transport layer, a perovskite photoactive layer, a passivation layer, an electron transport layer and a metal electrode from bottom to top. The method is characterized in that a polydentate chelating ligand N, N '-ethylenediamine disuccinic acid (EDDS) is doped in a perovskite photoactive layer, and the ligand and uncoordinated Pb and Idefects on the surface of perovskite form stable coordinate bonds simultaneously through a plurality of carboxyl groups in molecules of the ligand, so that multi-site synergistic passivation is realized, and non-radiative recombination is effectively inhibited. The process is simple and is compatible with the existing spin coating process. The maximum power conversion efficiency of the obtained device can reach 24.57%, the initial efficiency of 90.2% can still be kept after continuous illumination for 3000 hours, and the device has high efficiency and high stability and is wide in application prospect.

In the present invention, three novel ethylenediamine-N, N '-disuccinic acid (EDS) synthases are provided, which are derived from the group consisting of Cholatococcus asaccharoporus, Sargassum pedis, and Burkholderia sarisoli, and, in the present invention, there are provided three novel ethylenediamine-N, N'-disuccinic acid (EDDS) synthases, which are derived from the group consisting of Cholatococcus asaccharoporus, Sargassum pedis, and Burkholderia sarisoli, and, in the present invention, there are provided three novel ethylenediamine-N, N '-disuccinic acid (EDDS) synthases, which are derived from the group consisting of Cholatococcus asaccharoporus. More particularly, provided are a novel polypeptide having EDDS synthase activity, a method for producing EDDS using an EDDS synthase, a method for producing a composition comprising EDDS, and a method for preparing an EDDS synthase.

The present invention relates to a NAG detection test paper and its preparation method, comprising liquid A, liquid B, and liquid C. Liquid A is a substrate solution containing CNP-NAG, and the solvent is DMF and / or DMSO and purified water, and also contains TMN and / or ethylene glycol diethyl ether. Liquid B is a phosphate buffer solution. Liquid C is a fumaric acid-propylene sulfonic acid copolymer and / or one or more of nitrilotriacetic acid (NTA), sodium / potassium EDTA, diethylenetriaminepentaacetic acid (DTPA) and its salts, hydroxyethyldiphosphonic acid (HEDP), sodium ethylenediamine disuccinate (EDDS), and cyclohexanetriacyl ether (CDTA). The preparation process involves first spraying / soaking filter paper with liquid A and then drying it. Liquids B and C are then sprayed / soaked with the filter paper in separate steps, and then dried using hot air below 47°C. Finally, the paper is cut and sealed for storage to produce the NAG detection test paper. This method offers the advantages of simple operation, stable performance, and high sensitivity, while also improving the stability and shelf life of the test paper.

The invention relates to the technical field of scale inhibitors, in particular to a nuclear power waste heat driven low-temperature multi-effect distillation seawater desalination scale inhibitor and a preparation method thereof. The scale inhibitor is prepared from the following components in parts by weight: 45 to 55 parts of AMPS-AA-EDDS grafted copolymer, 4 to 6 parts of sodium polyepoxysuccinate, 2 to 3 parts of polyaspartic acid, 8 to 10 parts of tannic acid, 2 to 4 parts of chitosan and 10 to 20 parts of deionized water. The scale inhibitor has good environmental protection property, can be biodegraded and cannot be accumulated in the environment, can efficiently inhibit the generation of various common scales such as calcium carbonate, calcium sulfate, calcium phosphate and the like, has stable storage performance, ensures that the scale inhibition effect is not easy to attenuate under different storage conditions, and is suitable for industrial production. Therefore, efficient and stable operation of the seawater desalination system is guaranteed.

The invention relates to NAG detection test paper and a preparation method thereof.The NAG detection test paper comprises a solution A, a solution B and a solution C. The solution A is a substrate solution and comprises CNP-NAG, DMF and / or DMSO serving as a solvent and purified water and further comprises TMN and / or ethylene glycol diethyl ether; the solution B is a phosphate buffer solution; and the liquid C is one or more of fumaric acid-allylsulfonic acid copolymer and / or nitrilotriacetic acid (NTA), EDTA sodium salt / potassium salt, diethylene triamine pentaacetic acid (DTPA) and salt thereof, hydroxyl ethanediphosphonic acid (HEDP), sodium ethylenediamine disuccinate (EDDS) and cyclohexane triacid (CDTA). In the preparation process, firstly, filter paper is sprayed / soaked with the liquid A and then dried, then the filter paper is sprayed / soaked with the liquid B and the liquid C step by step, hot air at the temperature of 47 DEG C or below is used for drying, and finally cutting and sealing preservation are conducted to prepare the NAG detection test paper. The method has the advantages of simplicity and convenience in operation, stable performance and high sensitivity, and the stability and the service life of the test paper are improved.

This invention relates to a method for synthesizing S,S-EDDS using EDDS lyase catalysis, belonging to the field of enzyme catalysis technology. To address the problems of limited enzyme variety and poor activity in existing enzymes, this invention provides a method for synthesizing S,S-EDDS using EDDS lyase catalysis. The method is characterized by using fumaric acid and ethylenediamine as substrates, and conducting a catalytic reaction to generate S,S-EDDS under the catalysis of EDDS lyase. The EDDS lyase is selected from the amino acid sequences shown in SEQ ID NO. 2, SEQ ID NO. 3, SEQ ID NO. 5, SEQ ID NO. 7, SEQ ID NO. 9, or SEQ ID NO. 10. This invention exhibits high enzyme catalytic activity and can effectively catalyze the generation of the desired (S,S)-ethylenediaminedisuccinate.

The present invention is directed to a composition for depositing a palladium coating on an activated copper-coated substrate, the composition comprising:(i) palladium ions,(ii) chloride ions,(iii) ethylenediamine (EDA),(iv) ethylenediamine disuccinate (EDDS), and(v) at least one reducing agent,wherein the composition has a pH in a range from 7.5 to 9.5, preferably from 7.6 to 9.1, more preferably from 7.7 to 8.7, and most preferably from 7.8 to 8.5.

The present invention relates to a liquid cleaning composition comprising (i) ethylenediamine-N, N '-disuccinic acid (EDDS), (ii) at least one enzyme selected from the group consisting of amylases and proteases, (iii) at least one anionic surfactant, (iv) calcium (Ca2 +) and (v) water for enhancing the long-term stability of enzymes, their manufacture and use, for example in laundry or dishwashing.

The invention discloses a soil pollution prevention treatment agent and application thereof in construction land soil pollution assessment and remediation, the treatment agent is a dry weight formula, and the treatment agent comprises the following components by mass: 40-60% of charcoal / activated carbon; 5-15% of film-forming agents such as sodium alginate and hydroxyethyl cellulose; 5-30% of a high-molecular polymer emulsion; 2-4% of a chelating agent (EDDS, a sub-exogenous organic chelating agent); 2-4% of nano iron oxide (Fe2O3 / Fe3O4 and the like) or nano oxide; 10-20% of clay modified filler such as bentonite / montmorillonite and the like; 1% of a microbial preparation (a beneficial microorganism mixture); 4-6% of silicate modified powder / mineral powder (such as dihydrate silicate, zeolite and the like); and 2-4% of other auxiliary components (humic acid / slow-release carrier and the like). The synergistic control of heavy metals and organic pollutants is realized, the physical and chemical properties of soil are improved, the microbial activity is recovered, and the plant growth is promoted.

The application belongs to the technical field of complex preparation, and discloses a preparation method and application of a complex for efficiently chelating metal ions, which comprises the following steps: S1, weighing each raw material; S2, preparing a polyvinyl alcohol solution, and adding all raw materials except an initiator into the polyvinyl alcohol solution to prepare a mixed solution by stirring and mixing; S3, adding the initiator into the mixed solution after cooling to prepare an intermediate solution by stirring; and S4, performing a dialysis on the intermediate solution to obtain a complex PVA-g-EDDS. The application modifies polyvinyl alcohol by modifying ethylenediamine disuccinic acid on the surface of a film, so as to obtain PVA-g-EDDS. The PVA-g-EDDS has multiple strong chelating sites on a molecular chain, can treat metal ion wastewater with high concentration, and is also effective in chelating metal ions for low-concentration wastewater. After chelation, the molecular weight is increased, so that the metal chelate is intercepted by the film, and the wastewater treatment efficiency is greatly improved.

This invention provides a method for remediating cadmium-contaminated farmland soil using a multifunctional slow-release granule combined with EDDS-enhanced Bidens trifoliata. Before sowing, the multifunctional granules are applied to the cadmium-contaminated soil, followed by irrigation with calcium nitrate solution after sowing Bidens trifoliata. On day 40, a melatonin aqueous solution is applied as a top dressing; and on days 50-60, a mixed aqueous solution of EDDS and CaCl2 is sprayed. The multifunctional granules, from the inside out, consist of an alkali-modified biochar-supported iron-based oxide core, a urea-formaldehyde-PASP functional layer, and a calcium alginate shell. This invention achieves highly efficient remediation of cadmium-contaminated farmland soil by Bidens trifoliata through the temporal coupling of cadmium pre-fixation and slow-release nitrogen supply by the multifunctional granules, melatonin-promoted growth, and synergistic activation by EDDS / CaCl2. It is simple to operate, highly efficient, and can effectively shorten the remediation cycle of moderately and severely cadmium-contaminated farmland soil in arid and semi-arid regions, showing promising prospects for widespread application.

The present invention provides for improving the long-term stability of enzymes, comprising: (i) ethylenediamine-N,N'-disuccinic acid (EDDS); (ii) at least one enzyme selected from the group consisting of amylase and protease; (iii) at least one anionic surfactant; and (iv) calcium (Ca 2+ (v) a liquid cleaning composition comprising (v) water, the manufacture of the same, and its use, for example, in laundry or dishwashing.

The application relates to the field of agricultural planting technology, and discloses a planting method for reducing the lead content of wheat by combining chelation induction and leaf surface control, which comprises the following steps: firstly, detecting and screening the soil lead, implementing differentiated deep plowing and soil conditioner application on lead-free land and low-lead land, adopting standard deep plowing and applying silicon calcium mineral materials and biological agents on the lead-free land; deepening the deep plowing and applying a composite passivation regulator containing calcium dihydrogen phosphate, modified biochar and sepiolite on the low-lead land, shallow plowing before sowing and base application of an EDDS and citric acid compound chelation inducer, implementing differentiated leaf surface nutrient spraying and rhizosphere management at the seedling stage, spraying a leaf surface control agent at the jointing stage to construct a siliconized cell barrier, performing leaf surface control and nutrient synergistic spraying at the booting stage to the filling stage, dynamically monitoring the lead transport risk, and finally detecting the lead content and verifying the quality at the mature stage; through three-level synergistic control of the soil-root-leaf, the lead content of the wheat grains approaches 0.

The present invention is directed to a composition for depositing a palladium coating on an activated copper-coated substrate, the composition comprising:(i) palladium ions,(ii) chloride ions,(iii) ethylenediamine (EDA),(iv) ethylenediamine disuccinate (EDDS), and(v) at least one reducing agent,wherein the composition has a pH in a range from 7.5 to 9.5, preferably from 7.6 to 9.1, more preferably from 7.7 to 8.7, and most preferably from 7.8 to 8.5.

The present invention relates to the technical field of soil remediation, and in particular to a method for remediating farmland heavy metal compound contaminated soil by using EDDS to strengthen upland cotton, which comprises the following steps: planting upland cotton in the heavy metal compound contaminated soil, and during the growth of the upland cotton, adding 5mmol·kg ‑1 EDDS was applied twice. This application studies the effect of EDDS on the content of heavy metals Cd, Cu, Pb, and Zn in soil solution, and the effect on biomass and chlorophyll content of upland cotton and the absorption and enrichment of heavy metals by plants. At the same time, the effect of applying the same amount of chelating agent on the dry weight of upland cotton and the content of heavy metals in upland cotton under different levels of heavy metal complex pollution, as well as the change of heavy metal content in soil solution over time, was also studied. The research results can provide a theoretical basis for the use of chelating agents to enhance plant restoration of heavy metal complex contaminated soils.

The invention belongs to the technical field of complex preparation. The invention discloses a preparation method and application of a complex capable of efficiently chelating metal ions, and the preparation method comprises the following steps: S1, weighing raw materials, S2, preparing a polyvinyl alcohol solution, adding other raw materials except an initiator into the polyvinyl alcohol solution, stirring and mixing to prepare a mixed solution, S3, cooling the mixed solution, adding the initiator, stirring to prepare an intermediate solution, and S4, adding the intermediate solution into a reaction kettle, and stirring to prepare the complex capable of efficiently chelating metal ions. And S4, performing primary dialysis on the intermediate solution to obtain the complex PVA-g-EDDS. According to the invention, ethylenediamine disuccinic acid is modified on the surface of the membrane, and polyvinyl alcohol is chemically modified, so that PVA-g-EDDS is obtained. The PVA-g-EDDS has a plurality of strong chelation sites on a molecular chain, can treat metal ion wastewater with high concentration, and also can effectively chelate metal ions for low-concentration wastewater, and the molecular weight is increased after chelation, so that the metal chelate is intercepted by a membrane, and the wastewater treatment efficiency is greatly improved.