244 results about "Bi functional" patented technology

The invention relates to the technical field of chemical catalysis, and particularly discloses a covalent organic framework material loaded bimetallic monatomic electrocatalyst and a preparation method and application thereof, the catalyst comprises a carrier and atomic-scale dispersed metal diatomic active sites; the atomic-scale dispersed metal diatomic active sites are anchored in the carrier through a simple post-impregnation method; the carrier is a triazinyl covalent organic framework; a coordination structure is formed between the atomic-scale dispersed metal diatomic active sites and the carrier through a nitrogen-metal-chlorine bridging structure; the diatom-dispersed difunctional electrocatalyst has good overall water decomposition performance, under the condition of 1M KOH, the overpotential of hydrogen evolution reaction is 39.3 mV at 10 mA cm <-2 >, the overpotential of oxygen evolution reaction is 251.2 mV at 10 mA cm <-2 >, the synthesis process is simple and easy to implement, the preparation cost is low, and the diatom-dispersed difunctional electrocatalyst has industrial production and application prospects.

The invention discloses immobilized lipase based on bifunctional silicon dioxide as well as a preparation method and application of the immobilized lipase. Hydrophobic modification and covalent modification are performed on the surface of mesoporous silicon dioxide to obtain a bifunctional silicon dioxide carrier; the hydrophobic modification is any one of methylation modification, octylation modification, octadecyl alkylation modification, esterification modification and bromopropylation modification. The dual-functionalized silicon dioxide carrier is used for immobilization of lipase, and the prepared immobilized lipase can be used for production of biodiesel. The immobilized lipase provided by the invention is mild in enzyme reaction condition, good in biocompatibility, relatively high in enzyme activity, and excellent in stability and repeatability. In addition, by changing the ratio of the covalent modifier to the hydrophobic modifier, the catalytic activity and stability of the immobilized enzyme and the biodiesel yield are remarkably improved.

Embodiments provide bimodal polymerization catalyst systems comprising metallocene olefin polymerization catalysts and biphenylphenol polymerization catalysts made from biphenylphenol polymerization precatalysts of Formula I.

The invention discloses a difunctional electrocatalyst for carbon dioxide reduction and PET plastic oxidation and a preparation method and application of the difunctional electrocatalyst, and belongs to the field of application of electrocatalytic materials. The preparation method comprises the following steps: precipitating copper chloride and sodium hydroxide to obtain a precursor of copper hydroxide, and freeze-drying, washing and drying the precursor. The problem that the voltage required by the anode reaction is large when carbon dioxide is electrolyzed is solved. And meanwhile, the material has the advantages of excellent negative and positive electrode bifunctional activity and simultaneous generation of chemicals with high added value at the two electrodes, and has certain commercial application value. Meanwhile, the preparation method is simple, and technical feasibility is provided for large-scale preparation of fine chemicals through carbon dioxide reduction.

The invention relates to the technical field of biology, in particular to a mutant of difunctional glutathione synthetase and application of the mutant. The amino acid sequence of the mutant of the difunctional glutathione synthetase provided by the invention is obtained by performing site-directed mutagenesis on at least one of the 597th site, the 607th site, the 609th site, the 610th site, the 728th site and the 733th site of the amino acid sequence of the wild type difunctional glutathione synthetase, and the amino acid sequence of the wild type difunctional glutathione synthetase is shown as SEQ ID NO: 1. The mutant of the bifunctional glutathione synthetase provided by the invention has relatively high enzyme activity and enzyme stability, is more suitable for industrial production and is suitable for preparing glutathione, and the efficiency of preparing glutathione is improved.

The invention relates to a transition metal nickel monatomic difunctional electrocatalyst and a preparation method and application thereof, and belongs to the technical field of carbon dioxide electrolysis. The catalyst takes a transition metal nickel monatomic as an active component, the loading capacity of the active component is 2-5wt.%, a nitrogen-doped carbon material is taken as a carrier, and the microstructure of the carrier is a rhombic dodecahedron with the particle size of 100-200nm. The difunctional electrocatalyst used in the invention has excellent double functions of carbon dioxide electroreduction and sulfur dioxide electrooxidation activity, is applied to the constructed novel carbon dioxide electrolysis system, has lower electric energy consumption and operation cost compared with the traditional electrolysis system, and has huge application potential.

Embodiments described herein relate to a bi-functional thermal cooling system. The bi-functional thermal cooling system includes a first body, a second body, and a third body. The second body has a first plurality of Weyl semimetal nanostructures. The second body is spaced apart from the first body. The third body has a second plurality of Weyl semimetal nanostructures. The third body is spaced apart from the second body. The second body and the third body are each configured to independently rotate with respect to the first body to change an optical property of the first plurality of Weyl semimetal nanostructures of the second body and an optical property of the second plurality of Weyl semimetal nanostructures of the third body.

The application discloses a bifunctional In-doped Ni2Mo3N@Mo2C binary heterojunction catalyst and a preparation method and application thereof. A dimethyl imidazole solution is slowly added into a Mo salt solution to obtain a suspension liquid containing a Mo metal organic framework Mo-MOF; the suspension liquid is left to stand, and a precipitate is centrifuged and washed, and vacuum dried to obtain the Mo-MOF containing the Mo metal organic framework; a Ni salt, an In salt and the Mo-MOF are added into an anhydrous ethanol solution to perform ion exchange, and the precursor is vacuum dried to obtain the bifunctional In-doped Ni2Mo3N@Mo2C binary heterojunction catalyst. The catalyst material has excellent basic oxygen evolution and urea oxidation activity, and has a good application prospect in electrocatalytic decomposition of water, urea-assisted electrolysis of water and treatment of sewage containing urea.

The invention belongs to the field of biomass-based functional materials, relates to a difunctional coating based on enzymolysis modified cassava starch as well as a preparation method and application of the difunctional coating, and innovatively solves the technical problem that a single coating gives consideration to oil prevention and water absorption through a synergistic technical path of pretreatment and composite enzymolysis. The core mechanism is as follows: the starch particle structure is destroyed through pretreatment, and the degradation degree of starch is accurately controlled through the synergistic effect of alpha-amylase and saccharifying enzyme, so that an unexpected technical effect is achieved, and an enzymolysis product with a film-forming skeleton (medium molecular weight dextrin) and a hydrophilic unit (small molecular saccharide) is formed; meanwhile, a compact and continuous network structure can be formed by a film-forming framework, and grease permeation is blocked; and the hydrophilic unit endows the coating with a rapid capillary water absorption effect.

The invention relates to a method for synthesizing cyclic carbonate by catalyzing olefin oxidative carboxylation with a difunctional ionic liquid, which comprises the following steps: in a synthesis system, adding an oxidant and an additive into olefin serving as a raw material and the difunctional ionic liquid serving as a catalyst, and then carrying out epoxidation reaction; after the reaction is finished, potassium iodide and a carboxylation reagent are added into a reaction system, then cycloaddition reaction is performed, and finally cyclic carbonate can be prepared. The bifunctional ionic liquid is used as a catalyst, so that the olefin epoxidation reaction can be catalyzed, the cycloaddition reaction of an epoxide intermediate and CO2 can also be catalyzed, and the problem that a two-step reaction catalytic system is incompatible is solved. The adopted raw materials are cheap and easy to obtain, a metal-free catalyst is used, the method has the advantages of being economical and environmentally friendly, and an alternative scheme is provided for synthesis of cyclic carbonate.

The invention belongs to the field of electro-catalytic materials, and particularly relates to a bifunctional electro-catalytic water decomposition material and preparation and application thereof.The preparation method includes the steps that a first MOF precursor material is subjected to a first-stage coordination reaction in a solution containing an auxiliary a and an auxiliary b, and a first MOF is obtained; the first MOF is used as a substrate, a second-stage coordination reaction is carried out on a second MOF precursor material in a solution of an auxiliary c, the second MOF is deposited on the first MOF, and a core-shell double-MOF material is prepared; performing heat treatment on the core-shell dual-MOF material to obtain a heat-treated material; and mixing the heat treatment material with a phosphorus source, carrying out phosphating roasting treatment, and putting a phosphating product into a liquid-phase cooling medium while the phosphating product is hot, and carrying out quenching treatment, so as to obtain the bifunctional electro-catalytic water decomposition material. The bifunctional electro-catalytic water decomposition material prepared by the preparation method disclosed by the invention has excellent HER and OER dual catalytic activity.

The invention provides a novel bifunctional material and a preparation method and application thereof, and relates to the technical field of catalyst preparation, the bifunctional material has the following general formula: A-M / CaO-S, wherein A is an active component, M is an auxiliary agent metal, and S is a bifunctional material carrier; a is selected from at least one of Rh, Ru and Ni; m is selected from at least one of La, Ce, K and Na. According to the invention, the problems of tedious steps, low carbon efficiency, low energy efficiency and poor technical economy due to mutual independence of carbon dioxide trapping and chemical utilization processes are solved, and the technical effects of efficiently trapping carbon dioxide, catalyzing the reaction of carbon dioxide and methane in situ and successfully generating synthesis gas (H2 and CO) are achieved; and a solid scientific support is provided for economical efficiency and resource utilization of carbon dioxide.

The invention belongs to the related technical field of preparation of inorganic nano materials, and particularly relates to a preparation method of a bifunctional material for storage-in-situ oxidation of VOCs (volatile organic compounds), the preparation method takes ZSM-5 as a substrate material, an ion exchange method is used for modification, and the preparation method comprises the following steps: adding a pretreated commercial H-type molecular sieve into a metal nitrate solution, and stirring to obtain a mixed solution; stirring and reacting under a water bath condition, and then filtering, washing, drying and calcining to obtain the bifunctional material. The method disclosed by the invention has the advantages of simple process, low cost and the like, and the prepared bifunctional material has excellent storage-in-situ oxidation performance on toluene.

The present invention generally relates to electrochemical energy storage and battery technology. Specifically, the present invention relates to bifunctional electrocatalyst for metal-air electrochemical device. More particularly, the present invention relates to Nickel-Iron metal¬ organic framework (NF-MOF) as bifunctional electrocatalyst for zinc-air battery application. Further, the present invention relates to synthesis of Nickel-Iron metal-organic framework (NF- MOF) by refluxing method.

The invention discloses a bifunctional ionic liquid as well as a preparation method and application thereof, and belongs to the technical field of lithium resource extraction and hydrometallurgy. According to the invention, the dual-functional ionic liquid is prepared, and the dual-functional ionic liquid can be used for synchronously realizing efficient extraction of lithium ions from the lepidolite acid leaching solution and synergic deep removal of fluorine and chlorine, so that the limitation and defects of a traditional solvent extraction agent are effectively overcome; the problems that an existing lepidolite lithium extraction technology is long in process, low in separation efficiency and serious in equipment corrosion can be solved.

This invention belongs to the field of electrocatalytic materials, specifically relating to bifunctional electrocatalytic water splitting materials and their preparation and application. The preparation steps include: performing a first coordination reaction on a first MOF precursor material in a solution containing promoter a and promoter b to obtain a first MOF; using the first MOF as a substrate, performing a second coordination reaction on a second MOF precursor material in a solution containing promoter c to deposit the second MOF onto the first MOF, thus obtaining a core-shell bifunctional MOF material; subjecting the core-shell bifunctional MOF material to heat treatment to obtain a heat-treated material; then mixing the heat-treated material with a phosphorus source for phosphating and calcination, and rapidly cooling the phosphating product while hot in a liquid-phase cooling medium to obtain the bifunctional electrocatalytic water splitting material. The bifunctional electrocatalytic water splitting material prepared by the method of this invention exhibits excellent dual catalytic activity for both HER and OER.

The invention discloses a preparation method of a difunctional electrode, the electrode and application, and the preparation method comprises the following steps: (1) preparing an electroplating solution: taking deionized water as a solvent, sequentially adding nickel sulfate, ammonium sulfate, ammonium chloride and sodium thiosulfate, uniformly stirring, and adjusting the pH value to 4.5-5.5; (2) electrode pretreatment: taking a nickel wire mesh subjected to double-sided sand blasting as a cathode, and then sequentially removing oil and an oxide layer; and (3) electrochemical deposition: putting the pretreated cathode and the nickel-based stretching net anode into an electroplating solution, respectively connecting the cathode and the anode with the cathode and the anode of a power supply, and performing constant-current deposition at room temperature at the current density of 5-20mA / cm < 2 > for 30-90 minutes to obtain the difunctional electrode. The NiS alloy is prepared by optimizing an electroplating co-deposition process, the unification of high electrochemical activity and anti-iron adsorption performance is realized by utilizing a dual anti-iron mechanism of a polysulfide protective layer, the energy consumption of an electrolytic bath is reduced, and the service life is prolonged.

A bi-functional reactor and method for producing liquid fuels by reducing CO2 and oxidizing CH4. The reactor includes a vessel having first and second compartments separated by a membrane permeable to water. The first compartment is a catholyte chamber having an inlet, outlet, an electrode for reduction, and catholyte solution. The inlet of the catholyte chamber allows CO2 to flow as a feedstock into the first compartment, while the outlet allows excess CO2 and gaseous reduction products to exit the compartment. The second compartment is an anolyte chamber having an inlet, outlet, an electrode for oxidation, and anolyte solution. The inlet of the anolyte chamber allows CH4 to flow as a feedstock into the second compartment, while the outlet allows excess CH4 and gaseous oxidation products to exit the compartment. CO2 is reduced in the catholyte chamber and CH4 is oxidized in the anolyte chamber to form liquid fuels.

The invention provides a NiFePS / Co-ZIF-67 electrocatalyst as well as a preparation method and application of the NiFePS / Co-ZIF-67 electrocatalyst. The NiFePS / Co-ZIF-67 electrocatalyst is of a three-dimensional composite nanostructure formed by stacking NiFePS nanospheres on Co-ZIF-67 nanosheets grown on foamed nickel in situ. When the NiFePS / Co-ZIF-67 electrocatalyst is used as a difunctional electrocatalyst for full water splitting, the excellent difunctional full water splitting performance is shown, and the NiFePS / Co-ZIF-67 electrocatalyst has good catalytic stability under the conditions of HER, OER and full water splitting.

The invention relates to the technical field of environmental remediation, and particularly provides a bifunctional copper-based coordination polymer photocatalyst as well as a preparation method and application thereof.The bifunctional copper-based coordination polymer photocatalyst is prepared from copper chloride dihydrate, 4, 4 '-bis (3-pyridinecarboxamide) diphenyl ether and benzoic acid as main raw materials by adjusting reaction parameters. And reacting in a hydrothermal kettle to generate the bifunctional copper-based coordination polymer photocatalyst {[Cu2 (3-padpe) 2Cl2]. H2O} n. The method has the characteristics of simple process, low cost, high catalyst activity, good stability, reusability and the like, shows good application potential in repairing water bodies and soil polluted by organic matters and heavy metals, and provides a new research thought and insight for development of a novel multifunctional environment repairing agent.

The invention discloses an antibacterial and hydrophilic dual-functional ionic liquid double-layer membrane as well as a preparation method and application thereof. According to the double-layer film, corn starch (ST) and polyvinyl alcohol (PVA) serve as substrates, and natural dye alizarin (AL) is mixed to serve as a hydrophilic layer; chitosan (CS), corn protein (Zein) and vanillin (VA) serve as a supporting layer; meanwhile, the ionic liquid is doped, so that the double-layer film is endowed with a fresh-keeping function and sensitive detection capability, the limitation of a single detection function is broken through, and a new thought is provided for food safety.

Disclosed herein are novel bifunctional compounds formed by conjugating an EGFR inhibitor moiety with an E3 ligase ligand moiety, methods for preparing the same, and uses thereof.

The present invention provides a flexible lactate and pH dual-function sensor and its preparation method and application. The preparation method comprises the following steps: (1) coating a mixed slurry of hydroxyethyl cellulose and sodium lignin sulfonate on a polyethersulfone film, and using a CO2 laser to engrave the polyethersulfone film to obtain an ‑O‑S / PES‑LIG electrode, wherein the ‑O‑S / PES‑LIG electrode comprises a first functional region and a second functional region. (2) modifying polyaniline in the first functional region and modifying an enzyme immobilization layer composed of Prussian blue and lactate oxidase in the second functional region; (3) arranging a reference electrode in the peripheral area of ​​the first functional region and the second functional region of the ‑O‑S / PES‑LIG electrode, and drop-coating a conductive slurry. The sensor of the present invention has the characteristics of good flexibility and adaptability, controllable enzyme activity, and high structural integration, and can achieve synchronous and accurate detection of key metabolic indicators such as lactate and pH.

The invention provides a preparation method of a novel chiral thiourea / phosphine bifunctional organic catalyst with a cis-cyclic 1, 2-phosphinamine skeleton and application of the novel chiral thiourea / phosphine bifunctional organic catalyst in an asymmetric catalytic reaction. The chiral organic catalyst is prepared by taking cis chiral 2-(diphenylphosphine)-1, 2, 3, 4-tetrahydro-1-naphthylamine and an isothiocyanate compound as raw materials through a one-step reaction under a mild condition. The chiral thiourea / phosphine bifunctional organic catalyst is simple to prepare and stable in property, and shows excellent catalytic activity and stereoselectivity in an asymmetric hydrosilylation reaction of o-amido benzophenone.

This work investigates the beneficial roles of lithium bis(trimethylsilyl) phosphate (LiTMSP) which may act as a novel bifunctional additive for lithium ion batteries, in particular, LiNi0.5Mn1.5O4 (LNMO) / graphite cells. The cycle performance of LNMO / graphite cells is significantly improved with incorporation of LiTMSP. Trimethylsilyl functional group therein can react with HF generated through hydrolysis of LiPF6 by residual water in electrolyte solution, followed by a decrease in the concentration of metal ions dissolution from the electrode. The generation of superior passivating surface film derived by LiTMSP on graphite electrode, suppressing further electrolyte reductive decomposition and deterioration / reformation caused by migrated metal ions, is confirmed. Furthermore, LiTMSP derived surface film is likely to have better lithium ions conductivity with a decrease in resistance of the graphite electrode, improving rate performance of cells. The HF scavenging and film-forming effects of LTMPS are responsible for the less polarization of cells enabling to improve cycle performance.

The present invention relates to a bifunctional terpene synthase and its mutants, as well as the catalytic products. The amino acid sequence of the bifunctional terpene synthase is shown in SEQ ID NO.1. The bifunctional terpene synthase mutant is a protein composed of a new amino acid sequence formed by mutating the leucine at the 89th position of the amino acid sequence shown in SEQ ID NO.1 to glutamine or asparagine. The bifunctional terpene synthase FoFS to be modified in the present invention simultaneously has an isopentenyl transferase domain and a terpene cyclase domain, and has the dual functions of catalyzing the head-to-tail connection and cyclization of the terpene synthesis precursors DMAPP and IPP. FoFS has sesquiterpene products with multiple different ring systems. By modifying FoFS, the mutant protein can catalyze sesquiterpene compounds with other complex ring systems, which is of great significance for expanding the library of terpene natural products and adding more potential drug-value terpene compounds to the reserve force.

This invention belongs to the field of water electrolysis materials, specifically relating to a HER-OER bifunctional material and its preparation and application. The preparation method includes the following steps: a coordination reaction is carried out on mesoporous silica, a transition metal source, a heterocyclic compound of formula 1 (), and a structure inducing agent to obtain a composite material; the structure inducing agent is at least one of formulas 2 (), 3 (), and 4 (); the composite material from the coordination reaction is modified by a modifying liquid to obtain a modified material; the modifying liquid is a solution containing dissolved HF; the modified material from the modification reaction, a phosphating auxiliary, and a phosphating reagent are calcined in an atmosphere containing a functional gas at a temperature of 150℃~500℃ to obtain the HER-OER bifunctional material; the functional gas includes at least one of oxygen and H2S. The material prepared by this invention possesses special physicochemical properties, exhibiting excellent HER-OER bifunctionality. Furthermore, when used in water electrolysis, this material also exhibits low overall water electrolysis current density and excellent stability.

The invention discloses a double-function (p) ppGpp synthetase or hydrolase mutant, a biological material and application of the double-function (p) ppGpp synthetase or hydrolase mutant to preparation of L-threonine, and belongs to the technical field of gene engineering. The technical problem to be solved by the invention is how to improve the yield of L-threonine. Relative to a wild type, the bifunctional (p) ppGpp synthetase or hydrolase mutant comprises one or more of the following mutations: K1) mutation of 174th amino acid of SEQ ID NO: 2 into cysteine, K2) mutation of 529th amino acid of SEQ ID NO: 2 into phenylalanine, and K3) insertion of histidine and aspartic acid between 84th amino acid and 85th amino acid of SEQ ID NO: 2. The bifunctional (p) ppGpp synthetase or hydrolase mutant provided by the invention can be used for improving the yield of L-threonine of Escherichia coli.

The invention provides a preparation method of an acid-base bifunctional ZrO2 / DFNS loaded cobalt-nickel alloy catalyst for selective amination of biological polyol. Comprising the following steps: (1) synthesizing dendritic fiber nano silicon dioxide; (2) synthesizing dendritic fiber nano silicon dioxide / zirconium oxide; and (3) synthesizing the dendritic fiber nano silicon dioxide / zirconium oxide loaded cobalt-nickel alloy catalyst. The invention provides a heterogeneous composite catalyst which takes acid-base dual-functionalized ZrO2 / DFNS as a carrier, and a non-noble metal CoNi alloy is loaded on ZrO2 / DFNS through an equivalent-volume impregnation method. Under optimal conditions, the catalyst can be used for preparing 2-methylquinoxaline through efficient selective amination, the yield is as high as 94.6%, and the byproduct is H2O.