41results about How to "Cheap and easy to prepare" patented technology

The present invention includes methods for producing magnetic nanocrystals by using a biological molecule that has been modified to possess an amino acid oligomer that is capable of specific binding to a magnetic material.

Filter substrates are each provided with multiple protruding parts, and the disclosed humidifier filter comprises multiple such filter substrates which are laminated together and used as a humidifier filter laminate body. Said protruding parts are formed by applying pressure to portions of the substrates. Even using light-weight thin film-shaped filter substrates in the humidifier filter, space can be secured between neighboring humidifier filters. By this means, the filter substrates are not prone to damage during the manufacturing process, and humidification is not decreased.

Filter substrates are each provided with multiple protruding parts, and the disclosed humidifier filter comprises multiple such filter substrates which are laminated together and used as a humidifier filter laminate body. Said protruding parts are formed by applying pressure to portions of the substrates. Even using light-weight thin film-shaped filter substrates in the humidifier filter, space can be secured between neighboring humidifier filters. By this means, the filter substrates are not prone to damage during the manufacturing process, and humidification is not decreased.

The invention belongs to the field of heavy metal detection, and relates to a method for measuring methylmercury and ethylmercury. Chitosan is used as a raw material to prepare thiosemicarbazide-modified magnetic chitosan (AT‑MCS), and magnetic solid phase extraction (MSPE ) technology, using thiosemicarbazide modified magnetic shell magnetic solid phase extraction (MSPE) to extract materials, combined with high performance liquid chromatography and atomic fluorescence method to determine methylmercury and ethylmercury in environmental water samples, and established a water sample The speciation analysis method of methylmercury and ethylmercury in the method, the method is easy to operate, greatly saves analysis time and cost, the average recovery rate is 83.4%-106.0%, the relative standard deviation is 1.61%-9.83%, the extraction effect is good, The analysis result is accurate and the reproducibility is good; at the same time, the raw materials used in the invention are cheap and easy to obtain, the material preparation process is simple, the reaction conditions are mild, and the application environment is friendly.

The invention relates to a method oxidizing aromatic beta-diketone to synthesize carboxylic acid and belongs to the technical field of heterogeneous catalysis organic synthesis. The method specifically includes: under a condition that hydrogen peroxide is used as the oxidizing agent and acetone is used as the solvent, using a heteropoly acid ammonium salt composite photocatalyst [TEAH]nH3-nPW12O40 or [TEAH]nH3-nPW12O40 / SBA-15 to directly photo-catalytically oxidize the aromatic beta-diketone to synthesize the aromatic carboxylic acid. The method is simple, easy to operate, short in synthesizing time, mild in reaction condition (normal temperature and normal pressure) and high in catalyzing efficiency, and especially the selectivity of benzoylacetone can reach up to 97.82%.

The present invention belongs to the technical field of chemical industry, and specifically to a method for preparing n-propanol from a bio-base diol. According to the method, a glycerol hydrogenolysis product 1,2-propylene glycol and a catalyst prepared by loading a transition metal element on a carrier are subjected to a continuous reaction of high temperature dehydration and hydrogen transfer coupling on a fixed bed reactor under atmospheric pressure nitrogen protection to prepare the n-propanol. With application of the catalyst of the present invention in preparation of n-propanol from 1,2-propylene glycol through the dehydration continuity reaction, the single-process conversion rate is more than 86%, and the selectivity of the n-propanol in the product is more than 45%.

The invention belongs to the field of pesticide detection, and relates to a method for analyzing and detecting four kinds of heterocyclic pesticides in an environmental water sample. The four kinds of heterocyclic pesticides comprise carbendazim, triazolone, chlorfenapyr and fenpyroximate. The method for analyzing and detecting the four kinds of heterocyclic pesticides in the environmental water sample comprises the following steps: preparing amino ferroferric oxide by taking ferric trichloride hexahydrate as a raw material with the assistance of ethylene glycol, sodium acetate and ethanol amine; preparing a magnetic metal organic framework MOF-5 from the prepared amino ferroferric oxide; measuring the four kinds of heterocyclic pesticides by taking the prepared magnetic MOF-5 as a magnetic solid-phase extraction material and taking an efficient liquid chromatography as a measuring instrument. The method has the advantages of easiness and convenience in operation, adoption of readily-available raw materials, high accuracy of measuring result, average recycling rate of 80.30 to 108.33 percent, relative standard deviation of 2.96 to 7.94 percent, good extraction effect, accurate analysis result, high reproducibility and wide market prospect.

The invention discloses a preparation method and application of a quaternary ammonium salt-N-halamine type nano-antibacterial fiber. After the natural fiber is activated and pretreated, it is grafted with a polyamino polymer compound or a polyamino polymercapto polymer compound. After being grafted with a quaternary ammonium salt, crosslinking is carried out by a crosslinking agent, and the quaternary ammonium salt-N-halamine type nano antibacterial fiber of the present invention is obtained after bleaching; the nano antibacterial fiber of the present invention has both contact type and release type. The antibacterial function of the functional group greatly speeds up the sterilization speed, and it can also be sterilized under normal temperature and pressure. It has strong antibacterial property, long-lasting effect, and is not easy to produce drug resistance. The fiber antibacterial material can be made into medical supplies, such as cotton swabs, cotton Balls, gauze, masks, surgical gowns, etc., can be widely used in food packaging, food preservation, medical equipment, public health, water purification systems and many other fields, and have broad application prospects.