44results about How to "The preparation process is green and pollution-free" patented technology

The invention discloses a method for preparing slowly-digestible starch through malic acid modification. The method comprises the following steps of: blending the starch by use of a malic acid solution with mass concentration of 15-35% to obtain starch milk in which the mass ratio of malic acid to starch is (1:5)-(4:5), and uniformly mixing; adjusting the pH to 2.5-4.5 by use of a NaOH solution, uniformly mixing, and standing for 8-16 hours at room temperature; putting the product into an air-blowing drying oven at 45-55 DEG C, grinding and sieving with a 100-mesh standard sieve; putting the product in a high-temperature reaction kettle and keeping for 4-8 hours at 120-150 DEG C; taking out the product and cooling; washing the product with distilled water to remove residual malic acid and keep the pH value of the starch at 6-7; and drying in the air-blowing drying oven for 12-36 hours, grinding and sieving with the 100-mesh standard sieve to obtain the product. The malic acid is a harmless additive and can be used as a nutrient supplement. The method disclosed by the invention greatly increases the content of the product slowly-digestible starch, and simplifies the technology for preparing slowly-digestible starch.

The invention belongs to the technical field of functional materials, and in particular discloses a green preparation method and application of a lignin-based hydrogel. The preparation method comprises the following steps: adding CaCl2 powder to 1-ethyl-3-methylimidazolium acetate, stirring for dissolving, adding lignin, stirring, then adding acrylamide and N,N'-Methylenebisacrylamide, adding hydrogen peroxide, stirring evenly, and putting reaction system in nitrogen or carbon dioxide gas protection for reaction to obtain the lignin-based hydrogel. The preparation method has the advantages of simple preparation process, easy operation, and pollution-free and green preparation process, and is suitable for industrialized production; the obtained product can adsorb organic dyes in printing and dyeing wastewater, effectively reduces the content of the dyes in the wastewater, and has good application prospects.

The invention discloses a biologic graphite oxide obtained by nutrifying bacteria and a preparation method for the biologic graphite oxide. The preparation method comprises the following steps of: dispersing graphite in water to form a high-dispersion graphite mixed solution; adding the graphite mixed solution into a nutrifying bacteria culture medium, sterilizing, cooling and inoculating cultured nutrifying bacteria seed liquor, performing culture for many days, and introducing the dispersed graphite into oxygen-containing groups for oxidation under the action of the microbial nutrifying bacteria; after the culture is finished, removing thalli, metabolites and other ions produced by the oxidation process; and performing vacuum drying to obtain a pure biologic graphite oxide. The graphite is biologically oxidized by taking the microbial nutrifying bacteria with a low-valence state inorganic nitrogen oxidation function as strains; and compared with the conventional chemical graphite oxidation method, the method has the advantages that reaction conditions are mild and controllable, a reaction process is green and pollution-free, the prepared nutrifying bacteria biologic graphite oxide has a few shortcomings, and the like.

The invention discloses a conductive nanofiber porous membrane material with nanometer metal particles loaded on the surface and a preparation method thereof, belonging to the technical field of nanomaterials. The porous membrane material is composed of a conductive nanofiber porous membrane and nano-metal particles loaded on the surface of the conductive nanofiber porous membrane. The conductive nanofiber porous membrane is composed of a carbon fiber three-dimensional network skeleton and a graphene layer coated on the carbon fiber surface. The carbon fiber three-dimensional network The skeleton is composed of micron carbon fiber substrate and nano carbon fiber coating loaded on its surface. In the preparation method of the present invention, micron-scale woven cloth layers are stacked and combined with nano-scale nanofiber layers, and after carbonization, a three-dimensional network skeleton of micro- and nano-scale carbon fibers with a gradient structure is formed, which has the characteristics of excellent electrical conductivity and high sensitivity. The polydopamine deposited on the surface of the nanofiber is carbonized at high temperature into a graphene layer, which is coated on the surface of the three-dimensional network skeleton of the carbon fiber, which is more conducive to the excellent electrical conductivity of the graphene layer and broadens the application field of the nanofiber membrane material.

The invention discloses an interpenetrating network type porous polymer with adjustable and controllable surface performance and a preparation method of the interpenetrating network type porous polymer. The interpenetrating network type porous polymer is characterized by comprising a main body made from a porous material, wherein a layer of silicone rubber / paraffin microsphere compounds consisting of silicone rubber and paraffin microspheres is polymerized on a three-dimensional porous structure of the main body. According to the interpenetrating network type porous polymer with the adjustable and controllable surface performance and the preparation method of the interpenetrating network type porous polymer, continuous separation and recovery of an oil phase are achieved, the separation efficiency of oil contamination and the efficiency of environmental restoration can be significantly improved, the preparation cost is low, the process is simple, and a preparation process is green and pollution-free and has broad application prospect in the field of oil-water two-phase separation.

The invention belongs to the technical field of energy storage, and particularly relates to a preparation method of a graphene-based compact composite material. The preparation method at least comprises the following steps of adding a dispersing liquid of an insoluble constituent into a graphene dispersing liquid, and performing full stirring to obtain a first mixed dispersing liquid; adding a reduction constituent, and performing full stirring to obtain a second mixed dispersing liquid; adding to a hydrothermal reaction kettle for hydrothermal reaction to obtain hydrogel; fully immersing thehydrogel in deionized water, removing impurity, performing evaporation, drying and moisture removal to obtain a product to be processed; and performing high-temperature thermal processing, and furtherremoving an oxygen-containing functional group to obtain the three-dimensional compact composite material. The pre-arrangement effect of the insoluble constituent during the rapid and compact formation process of a graphene network is promoted by the reduction constituent, gaps among other insoluble constituent particles are reduced by a shrinkage effect of the three-dimensional graphene networkduring the solvent removal process, material compactness is achieved, so that the composite material with relatively high density is obtained.

The invention provides a continuous cellulose aerogel fiber and a preparation method thereof. The preparation method comprises the following steps: dispersing cellulose into a dispersing agent so as to obtain a spinning stock solution; extruding the spinning stock solution into a coagulating bath for wet-method spinning so as to obtain cellulose aerogel fiber; winding the cellulose aerogel fiber in the coagulating bath, and soaking into an aging liquid for aging; washing the aged cellulose aerogel fiber till the pH is neutral, and drying, so as to obtain the continuous cellulose aerogel fiber. The preparation method provided by the invention has the characteristics that raw materials are cheap and easy to obtain, the preparation process is simple, green and pollution-free, the continuous cellulose aerogel fiber is good is spinnability, and the problem that cellulose aerogel is hard to spin into fiber is solved. The diameter of the cellulose aerogel fiber provided by the invention is smaller than 120 [mu]m, the cellulose aerogel fiber has the characteristics of high specific surface area (greater than or equal to 88m<2> / g), high porosity (greater than or equal to 85%), and low density (less than or equal to 0.2 / cm<3>), meanwhile the fiber specific surface area can be adjusted, and the cellulose aerogel fiber can be used in fields such as functional clothes, sensing, catalyst loading and adsorption filtration, cosmetics and biological treatment.