67results about How to "Promote high-value utilization" patented technology

The invention discloses a chitosan / perovskite nanometer composite film as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing chitosan iodide; (2) dissolving methylamine salt, the chitosan iodide and lead iodide or lead chloride in DMF in a closed environment; introducing a protective gas; stirring for 6h to 10h at the temperature of 55 to 65 DEG C to prepare a perovskite precursor solution; (3) spin-coating the obtained perovskite precursor solution to obtain the chitosan / perovskite nanometer composite film. The prepared chitosan / perovskite nanometer composite film is applied to a solar photocell structure and has the advantages of effectively increasing the filling rate of a solar cell and also improving the energy transformation efficiency of the cell to a certain extent. The preparation method disclosed by the invention is clean, simple and free of pollution in preparation process and is suitable for large-scale production.

The invention discloses a method for producing 2,3-butanediol by using Chinese herbal medicines which are rich in starch as raw materials for fermentation, belonging to the bio-chemical technology field. The method is characterized in that the Chinese herbal medicines which are rich in the starch are taken as the raw materials, saccharified liquid is obtained by liquefaction and saccharification,the saccharified liquid is taken as a carbon source and mixed with inorganic salt nutrition ingredients after sterilization, a strain for producing the 2,3-butanediol is inoculated for carrying out the flask-shaking fermentation, the batch fermentation or the fed-batch fermentation through the supplement of solid glucose, thereby obtaining the 2,3-butanediol with higher concentration. The method has the effects and the advantages that, the raw materials are easy to take, the problems of competing grain with people, competing land with grain, and the like do not exist, the method can effectively reduce the production cost of the 2, 3-butanediol by using the biotransformation method and simultaneously obtain the 2, 3-butanediol with the higher concentration, thereby having broad prospect for high-value utilization of the Chinese herbal medicines.

The invention discloses preparation and application of a marine biological waste oyster shell-supported palladium catalyst. Oyster shells are used as calcium, cetyltrimethylammonium bromide is used asa porogen to synthesize hydroxyapatite by a hydrothermal method, and a heterogeneous palladium catalyst which can be recycled is prepared. The preparation of the marine biological waste oyster shell-supported palladium catalyst has the following advantages that (1) the oyster shells and phosphate are used as raw materials, the oyster shells and the phosphate are low in cost, easy to obtain, widely available and environmentally friendly, and the process is simple; (2) a Heck reaction of aryl halides such as iodobenzene and bromobenzene with olefin can be can efficiently (90% or above) catalyzed, after repeated six-time use of the catalyst, the activity is almost not reduced, and the product yield is still 90% or above; (3) excellent catalytic ability is achieved on Sonogashira coupling; and (4) compared with other carrier materials, hydroxyapatite carrier materials have the significant advantages that good chemical stability, thermal stability, low solubility and adjustable surface acid and base are achieved, the structure is easy to modify, and ion exchangeability is high.

The invention discloses a method for preparing magnesium oxide aerogel with bischofite as a material. The preparation method comprises the following steps: (1) bischofite, distilled water, alcohol solvent and water-soluble polymer are mixed and stirred for 5 to 120 minutes, so that a transparent solution is obtained, and an epoxy compound is then added into the solution and stirred for 5 to 60 minutes, so that a sol is obtained; (2) the prepared sol is sealed for gelation, the temperature of gelation is 20 DEG C to 95 DEG C, the time of gelation is 2 to 20 hours, and thereby a wet magnesium oxide gel is obtained; (3) the obtained wet magnesium oxide gel is immersed and washed with distilled water for not less than three times, and the usage of the distilled water is not less than the volume of the wet magnesium oxide gel; (4) after immersion and washing in step 3, the magnesium oxide gel is dried, and thereby the magnesium oxide aerogel is prepared. The method effectively solves the problem that magnesium alkoxide is extremely easy to hydrolytically polycondense and the process is not easy to control in the conventional preparation of wet magnesium oxide gel by utilizing the magnesium alkoxide and the problem that the magnesium alkoxide is highly toxic, expensive and extremely sensitive to the temperature and humidity of the environment, and is not easy to synthesize and store.