7results about How to "Increase surface potential" patented technology

The invention relates to a polyamide composite reverse osmosis membrane and a preparation method thereof. The polyamide composite reverse osmosis membrane comprises a base membrane, the separation layer covers the base membrane and is prepared by carrying out interfacial polymerization reaction on a water phase solution and an oil phase solution; the separating layer is covered with the functional layer, the functional layer is a reaction product of end-capping reagents and carboxyl-terminated groups of the separating layer, and the end-capping reagents are respectively a single-functional-group end-capping reagent and a multi-functional-group modifier. The preparation method of the polyamide composite reverse osmosis membrane comprises the step of soaking the base membrane which is sequentially soaked in a water phase solution and an oil phase solution in a solution containing an end-capping reagent. According to the polyamide composite reverse osmosis membrane prepared by the preparation method provided by the invention, the surface carboxyl content is reduced, the surface potential is improved, and the adsorption of pollutants is reduced, so that the water efficiency and the desalination rate are improved.

The invention provides an alkali polishing method of a crystalline silicon cell, a single-side polished crystalline silicon cell and a battery, the alkali polishing method comprises the following steps: protecting one side of the crystalline silicon cell, soaking the crystalline silicon cell in an alkali solution with nano bubbles to obtain the single-side polished crystalline silicon cell, and the average size of the nano bubbles is 0.1-45nm. According to the alkali polishing method provided by the invention, the nano-bubbles are introduced into the alkali solution, pollution to the surfaces of chemicals and batteries is avoided, and the nano-bubbles have very high oxidation performance and surface potential and can have a relatively good etching effect on silicon and silicon oxide, so that the alkali concentration in the polishing process can be greatly reduced; therefore, the use amount of alkali is reduced, and the use amount of additives can be greatly reduced; besides, in the alkali polishing method, the alkali solution contains nano bubbles, so that the consumption of chemicals in the subsequent process can be further reduced, and the waste liquid treatment cost is greatly reduced.

The invention discloses a method for removing high-valence ions and organic matters in a lithium-rich solution of brine, which comprises the following steps: carrying out first nanofiltration separation on the lithium-rich solution with the pH value of 3.0-6.0, carrying out second nanofiltration on a first trapped fluid to further separate and recover lithium, and carrying out third nanofiltration on the first trapped fluid and a first permeate to realize deep removal of the high-valence ions and the organic matters. According to the invention, three-stage nanofiltration is subjected to series-parallel configuration and design, so that the separation effect of lithium ions, foreign ions and organic matters is improved; an electric field is arranged to strengthen the nanofiltration process driven by pressure, the solute hydration state difference and the mass transfer rate are enhanced, and the separation performance is improved. According to the method provided by the invention, the removal rate of high valence ions in the lithium-rich liquid is gt; 99.9%, and the organic matter removal rate gt; and the lithium ion flux is improved by more than 20%. The process and the strengthening measure are a separation method with high universality, impurity ions and organic matters in different types of lithium-rich solutions can be removed, and large-scale industrial popularization is facilitated.

The invention provides a ZIF-8 modified fiber filtering membrane and a preparation method thereof. The preparation method comprises the following steps: performing multi-needle electrostatic spinning on ZIF-8 dispersion liquid, a first spinning solution and a second spinning solution to obtain a ZIF-8 modified fiber filtering membrane; wherein the mass ratio of the poly-L-lactic acid to the poly-D-lactic acid in the first spinning solution and the second spinning solution is (1: 1)-(50: 1) independently, and the sum of the concentration of the poly-L-lactic acid and the concentration of the poly-D-lactic acid in the first spinning solution is 80-100 g / L; the sum of the concentrations of the poly-L-lactic acid and the poly-D-lactic acid in the second spinning solution is 60-80 g / L. The fiber filtering membrane prepared by the preparation method has the advantages of high surface potential, high dielectric constant, high specific surface area, efficient antibacterial property, ultralow air resistance, high heat resistance, efficient interception of ultrafine particles and the like.

The invention discloses a copper metal covalent organic framework material (Cu-COF), a composite film material and a preparation method and application of the composite film material. The preparation method comprises the following steps: carrying out Schiff base reaction on tri (2-4 formaldehyde-pyrazole nitrogen-N, N ')-tri-copper and 2, 5-dimethoxy terephthaloyl hydrazine to construct a crystal material Cu-COF; cu-COF and MC are compounded to prepare flexible Cu-COF and MC composite film materials with different proportions, and a Cu-COF-TENG device is assembled, so that the TENG device assembled by 10% of Cu-COF and MC has optimal output performance and excellent stability. Then, a flexible TENG capable of being pressed / pressed continuously of a Cu-COF-MC-TENG device is constructed, a TENG signing motion monitoring self-powered sensor is analyzed, and contact and separation of the TENG are achieved under the condition that a sign pen moves, so that mechanical energy is converted into an electric signal, and application in a Cu-COF flexible sensor is achieved.

The application discloses a water-based wheel-rail friction modifier and a preparation method thereof, and raw materials include bentonite, talcum powder, molybdenum disulfide, modified zirconium phosphate, copper-based nanomaterial, silicon dioxide, magnetic iron oxide, sodium silicate, metal passivator, water-based epoxy resin, acrylic emulsion, water-based polyurethane, polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, ethylene glycol, modified wheat straw powder, sodium dodecyl sulfate, antioxidant, AMP-95, defoaming agent and deionized water. After the above ingredients are weighed, they are sequentially stirred and mixed, and then are ground and homogenized to obtain a finished product. The application solves the problems of the existing water-based tread modifier, such as large friction coefficient fluctuation, easy failure at high temperature and metal corrosion of the water-based system.

A biomimetic silicification-enhanced catalyst and its preparation method are disclosed. The preparation method includes the following steps: S1: Urea, iron salt, and copper salt are added to a first solvent to obtain a mixed solution; S2: The mixed solution undergoes a hydrothermal reflux reaction to obtain particle units; S3: The particle units undergo a silicification reaction with ammonia and a silica precursor to obtain a catalyst. The catalyst prepared by this method can not only reduce its band gap by copper doping to utilize visible light as a reaction light source and reduce reaction conditions, but also inhibit the aggregation of catalyst particles by utilizing the mesoporous silica layer on the surface, expose more reaction sites, and limit the heat loss of the internal particle units, thereby increasing the reaction temperature. This can effectively improve the organic matter treatment effect of the catalyst. It adsorbs and degrades dyes in wastewater through two modes: electrostatic attraction and catalytic decomposition of hydrogen peroxide to generate strong oxidizing free radicals.