8 results about "Selenourea" patented technology

The invention belongs to the technical field of waste resource utilization and heavy metal pollution treatment, and particularly relates to preparation and application of papermaking pulp residue-based selenourea modified biochar. The papermaking pulp residue-based selenourea modified biochar is obtained by modifying papermaking pulp residue biochar with selenourea, and the theoretical maximum adsorption capacities of the papermaking pulp residue-based selenourea modified biochar to cadmium, lead and copper in a water body are 76.34 mg / g, 213.68 mg / g and 48.87 mg / g respectively; meanwhile, the papermaking pulp residue-based selenourea modified biochar also has good adsorption and passivation effects on heavy metals cadmium, lead and copper in soil, when applied to the soil, the biochar can significantly promote the growth of the pakchoi, the transport coefficient of the pakchoi is significantly reduced compared with other treatments, the underground enrichment of heavy metals is reduced, and the transport capacity is reduced. The enrichment of the heavy metal on the overground part is jointly reduced, and the method has important significance on guaranteeing agricultural production and agricultural product safety.

The invention discloses selenourea modified starch as well as a preparation method and application thereof, and belongs to the technical field of chemical engineering. The structure of the selenourea modified starch is shown in the specification, the average value range of n is 5-12000, and R is any one of the following structures. The selenourea modified starch has the beneficial effects that selenourea groups are grafted into the starch through a chemical method, and the obtained selenourea modified starch is good in water solubility and excellent in antioxidant activity, particularly has an extremely good scavenging effect on DPPH free radicals, and is a very good antioxidant; the preparation method has the advantages of fewer steps, shorter time consumption and lower energy consumption, and has the feasibility of large-scale preparation.

The invention provides a carbon dot with double functions of near-infrared two-region imaging and ROS (reactive oxygen species) removal and a preparation method of the carbon dot. The carbon dot is prepared by reacting an aniline monomer containing a p-phenylenediamine amino group and selenourea as precursors, and has a near-infrared second region (NIR-II) fluorescence emission characteristic and active oxygen (ROS) scavenging capacity.

Disclosed is an application of a class of selenium-containing organic compounds in copper sulfide flotation collectors, including organic compound with selenium atoms as functional groups and containing single selenium atom or multiple selenium atoms, where the organic compound with selenium atoms as functional groups and containing single selenium atom or multiple selenium atoms includes but not limited to selenophene, phenylselenol and diselenide as copper collectors; and a class of organic compound containing selenium atoms combined with nitrogen, oxygen, phosphorus, sulfur and carbon, where the class of organic compound containing selenium atoms combined with nitrogen, oxygen, phosphorus, sulfur and carbon includes but not limited to selenomethyl ester, carbonyl selenomethyl ester, oxycarbonyl selenomethyl ester, selenourea, selenium nitrogen, selenoxanthonic acid, selenoxanthate, selenophosphoric acid, selenium phosphate ester, triphenylphosphine selenide, all kinds of benzoselenediazole molecules as copper collectors.

The application provides a thiourea-selenourea random copolymer and a preparation method and application thereof, and belongs to the technical field of polymer synthesis. The thiourea-selenourea random copolymer is synthesized by using polysaccharide, isonitrile compound and binary amine to carry out a multi-component polymerization reaction under a catalyst-free condition, and contains thiourea and selenourea repeating units. The raw materials used in the method are easy to obtain or simple to prepare. The method has the advantages of mild reaction conditions, simple process, high efficiency and high yield, and can realize efficient synthesis of the thiourea-selenourea random copolymer. The thiourea-selenourea random copolymer prepared by the application contains both sulfur atoms and selenium atoms, and thus has a high refractive index in a thin film state and has a wide application prospect in the field of light shielding materials.

The invention relates to the technical field of selenium nano materials, in particular to selenium nano particles and a preparation method thereof. According to the method, selenourea is used as a selenium source, selenium simple substance is prepared through oxidation reaction, deoxysodium cholate is used as a stabilizer to prepare micelles, and selenium nanoparticles with uniform size and diameter and good dispersity can be simply prepared. Compared with a traditional method, the method has the advantages that a reducing agent is not needed, the high toxicity risk caused by selenium salt such as sodium selenite is avoided, meanwhile, oxygen serves as a green oxidizing agent, natural biomolecular bile salt with biocompatibility serves as a stabilizer, only one-step reaction is needed, complex reaction conditions are not needed, and therefore the method is more suitable for preparing the selenium nano material in batches; the method is safe in raw materials, green in process, excellent in product performance, easy to industrialize and wide in application prospect.

The invention provides a nickel-cobalt phosphide electrode and a preparation method thereof, a foamed nickel base material is immersed in a mixed solution A for a first hydrothermal reaction, and the mixed solution A contains nickel ions, cobalt ions, sodium hypophosphite, urea and an ion regulating agent; an ion stabilizer is at least one of thiourea, selenourea, potassium iodide and sodium aluminate, a mixed solution B is obtained and subjected to a second hydrothermal reaction, a foamed nickel base material coated with a nickel-cobalt phosphide electrode material is obtained, and the ion stabilizer is at least one of thiourea, selenourea, potassium iodide and sodium aluminate; and uniformly distributing an ion dispersing agent on the surface of the foamed nickel base material coated with the nickel-cobalt phosphide electrode material, and then drying. Two hydrothermal reactions are combined, and the second hydrothermal reaction is performed through ion stabilizers of thiourea, selenourea, potassium iodide and sodium aluminate, so that nickel-cobalt phosphide ions are better combined with one another, and then a dispersion layer of sodium citrate and polyvinylpyrrolidone is formed on the surface of the material; and the capacitance, the conductivity and the cycle performance of the nickel-cobalt phosphide electrode are improved through mutual cooperation.