701results about How to "Few synthetic steps" patented technology

The invention relates to a method for quickly growing a large-size SiC (Silicon Carbide) single crystal. The method comprises the following steps: putting a mixture of silicon powder and carbon powder at the bottom of a graphite crucible, and placing a porous graphite flake on the surface; fixing a seed crystal to the top of the graphite crucible, vacuumizing a growth chamber, charging Ar gas or mixed gas of Ar and H2 into the growth chamber, heating the seed crystal until the temperature reaches 1,600-2,000 DEG C, and reacting for 2-5 hours under the pressure of 800-900mbar to obtain a SiC source material; raising the temperature to 2,200-2,500 DEG C, continuously charging the Ar gas, reducing the pressure, sublimating powder at the bottom to the surface of the seed crystal, and growing the seed crystal for 30-50 hours to obtain the large-size SiC single crystal. According to the method, SiC powder can be synthesized at one time, the SiC single crystal can be grown in situ, the cost is low, and the process is simple.

The invention relates to a preparation method of iron oxyhydroxide / graphene oxide composites. The method uses an improved Hummers method to regulate a proportion of a saturated ferric salt aqueous solution for preparing a precursor sol with boiling water, and a concentration of a graphene oxide aqueous solution, thereby preparing the iron oxyhydroxide / graphene oxide composite material with monodisperse nanoparticles and a size of less than 10 nanometer, and without a surfactant. The iron oxyhydroxide / graphene oxide composite material prepared by the method has characteristics of small particle size of the iron oxyhydroxide, monodispersed iron oxyhydroxide on surfaces of the graphene oxide, and large specific surface area; and the method is low in equipment investment, few in synthesis steps, simple in operation technology, low in production cost, easy to realize industrial production and wide in application prospect.

The invention discloses a compound super-hydrophobic ocean antifouling paint which comprises the following components by weight: 170-200g of acrylic resin, 1-10g of silicon dioxide particles, 1-10 parts of cuprous oxide particles and 10-100 parts of n-butyl alcohol. The invention further discloses a preparation method and application method of the compound super-hydrophobic ocean antifouling paint. Compared with a market-oriented paint with low surface energy, the ocean antifouling paint is simple in preparation process, is synthesized by few steps and has obvious 'lotus leaf self-cleaning effect' and excellent storage stability.

The invention provides a treatment method of organic wastewater through synthesis-free heterogeneous Fenton treatment. The treatment method comprises the following steps of directly adding ferrous ion salt, H2O2 and bentonite powder in waste water, enabling solid-liquid mass ratio of bentonite and the waste water to be 1:1000-10000, enabling ferrous ionic charge mole number to be 50-100% of added bentonite cation exchange capacity, enabling molar ratio of Fe2+ and the H2O2 to be 500-1000:1, adjusting the pH value to be 5-6, stirring and reacting for 5-10min, conducting solid-liquid separation, and enabling the waste water to be discharged after reaching the standard. A series of complex synthesis steps of an original bentonite loaded ferric oxide catalytic agent before application are removed. Purification treatment time of the organic wastewater is shortened, and efficiency is improved. Cation exchange characteristics of the bentonite is used, iron ion is exchanged to a bentonite layer while the iron ion expresses catalytic action, loss of the iron ion is avoided, pollution of the iron ion in water is avoided, and possibility of reutilization is improved.

The invention discloses a method for synthesizing 5,5'-dinitroamino-3,3'-co-1,2,4-triazole carbohydrazide. The carbohydrazide has the following structural formula, wherein the structural formula is as shown in the specification. In the method, 5,5'-diamino-3,3'-co-1,2,4-triazole serves as a raw material, and the method comprises the following steps: (1) adding the 5,5'-diamino-3,3'-co-1,2,4-triazole into a nitric acid and ammonium nitrate system in batches at the temperature of 0 DEG C, wherein a molar ratio of the 5,5'-diamino-3,3'-co-1,2,4-triazole, nitric acid to ammonium nitrate is 1:40: (4-8), stirring for 15 minutes, raising the temperature to 25 DEG C, reacting for 1.5 hours, pouring the reaction liquid into ice water, filtering, washing and drying to obtain 5,5'-dinitroamino-3,3'-co-1,2,4-triazole; and (2) adding the 5,5'-dinitroamino-3,3'-co-1,2,4-triazole, an aqueous liquid of sodium hydroxide and carbohydrazide into a reaction bottle under the temperature of 60 DEG C, wherein a molar ratio of the 5,5'-dinitroamino-3,3'-co-1,2,4-triazole, sodium hydroxide to carbohydrazide is 1:3:2.05, stirring for 20 minutes, dropwise adding 35 mass percent of hydrochloric acid until the pH value is 4-7, reducing the temperature to 25 DEG C, separating out a white product 5,5'-dinitroamino-3,3'-co-1,2,4-triazole carbohydrazide in the system. The method is mainly used for preparing the5,5'-dinitroamino-3,3'-co-1,2,4-triazole carbohydrazide.

The invention discloses a method for synthesis of a benzimidazole derivative phosphate anion fluorescence probe and an application method thereof, and relates to the field of synthesis and application of the fluorescence probe. The synthesis of the benzimidazole derivative phosphate anion fluorescence probe can solve the problem that the florescence probes used for detecting PO43- are very scarce in kinds, that the identification of PO43- can be easily influenced by H2PO4- and HPO42-, and that the florescence probes can not directly carry out identification independently. The Benzimidazole derivative phosphate anion fluorescence probe is 1,4 phenyl double (carbamoyl methyl) N e alkylbenzimidazole ammonium chloride], which is obtained under quaterisation between Dichloro acetyl para-phenylene diamine and N-E alkyl benzene and imidazole. The fluorescence probe dissolves in HEPES buffered solution prepared by deionized water, and then test change in the absorbance value and fluorescence intensity to adjust the existence of PO43-. The Benzimidazole derivative phosphate anion fluorescence probe can be used to directly detect the po43- in water and blood.

The invention discloses a method for catalytically degrading a waste polyester material by using a zinc catalyst, belongs to the technical field of polyester degradation, and aims to solve the problems that an existing polyester waste chemical recovery catalyst is low in catalytic efficiency and low in material universality. According to the method disclosed by the invention, a zinc catalyst with a simple structure is adopted, and various polyester materials are depolymerized into small organic molecules through an ester exchange reaction catalyzed by the zinc catalyst under the participation of an alcohol compound, so that the recycling of the waste polyester is realized; and the method disclosed by the invention has good universality, and has a good depolymerization effect on polyester materials with various different structures.