49results about How to "Strong adsorption properties" patented technology

The invention provides a method for preparing a boropolysilicate aluminum iron-chitosan composite flocculant. The preparation method uses aluminum sulfate, iron sulfate, sodium silicate, sodium tetraborate and chitosan as raw materials, and first utilizes silicon sodium borate in sulfuric acid solution to prepare polysilicic acid; secondly, add aluminum sulfate, ferric sulfate, sodium tetraborate and chitosan acetic acid solution in polysilicic acid solution to prepare boropolysilicate aluminum iron-chitosan composite flocculation agent. The composite flocculant prepared by the preparation method of the present invention is a novel flocculant with high efficiency, environmental protection and low cost, and has the advantages of stable performance, good storage performance, convenient use and the like.

The invention provides a preparation method of spinel-structure lithium titanate. The preparation method comprises the following steps: 1, taking metatitanic acid produced in a process of producing titanium dioxide with a sulfuric acid method; preparing the metatitanic acid into slurry A with de-ionized water; 2, adding calcining seed crystals, which are widely used in a process of producing rutile-type titanium dioxide with the sulfuric acid method, into the slurry A, wherein the mass ratio of TiO2 in the calcining seed crystals to TiO2 in the slurry A is (2 to 20) to 100; after uniformly stirring, filtering and washing with water; stopping water washing when the pH (Potential of Hydrogen) value is greater than 1.8; adding de-ionized water into a filter cake to prepare slurry B with the TiO2 concentration of 200g / L to 400g / L; 3, adding a lithium source into the slurry B according to the mole ratio of Li to Ti of 0.82 to 0.97; sufficiently and uniformly stirring to obtain slurry C; 4, conveying the slurry C into a rotary kiln; heating and calcining to finish dehydration, desulfurization and crystal form transformation to prepare the spinel-structure lithium titanate. According to the preparation method provided by the invention, all the methods are slurry processes, and dry-method crushing and grinding do not need to be carried out before the crystal form transformation is finished by heating so that energy consumption is low; a titanium source is cheap and easy to obtain.

The invention relates to a sulfonated sodium alginate grafted agarose gel chromatographic medium as well as a preparation method and application. The preparation method comprises the following steps:firstly, selecting the sodium alginate grafted agarose gel chromatographic medium with a suitable ion exchange capacity as a basic medium for carrying out sulfonic group modification; secondly, controlling the concentration of sodium hydroxide in an allyl bromide activation process; finally, determining the concentration of sodium pyrosulfite and determining the pH (Potential of Hydrogen) value ofthe solution and sulfonation time. According to the sulfonated sodium alginate grafted agarose gel chromatographic medium provided by the invention, the static saturated adsorption capability on lysozyme can reach 358mg / mL and the lowest dynamic binding capacity under a 10 percent penetration condition is also 100mg / mL or more. The medium has the advantages of simple preparation method and low cost, and has a wide application prospect in efficient separation and purification of protein.

A method for preparing a porous carbon-loaded graphene-coated nano-nickel particle wave-absorbing material, using algae as a carbon source, soaking it in a nickel salt solution, so that nickel ions enter the algae cells. After freeze-drying, it is subjected to low-temperature heat treatment, and the algae are converted into carbon, and the metal nickel salt is oxidized to nickel oxide; then the temperature is raised to continue high-temperature heat treatment, so that the nickel oxide is reduced to nickel, and the coating on the nickel nanometer is realized during the heat treatment process. The granular amorphous carbon is catalyzed and graphitized, and finally a composite material of porous carbon-supported graphene-coated nano-nickel particles is obtained. The invention uses algae as a carbon source, which is economical and practical, and uses the characteristics of rich pores in natural algae plants to uniformly disperse nickel on the carbon material; after heat treatment, a porous carbon material with a network structure is obtained, and the nickel particles coated with graphene are dispersed in the porous carbon material. The surface of the carbon material makes the material have excellent microwave absorption properties.