58results about How to "Increased oxygen-containing functional groups" patented technology

The invention discloses a magnetic biochar composite adsorbent as well as a preparation method and application thereof, and belongs to the field of biochar materials. Almond shell biomass and ferrousnitrate are used as raw materials, the particle size fraction of the adsorbent is reduced through thermal degradation process magnetization and a mechanical ball milling process, and finally the magnetic biochar composite adsorbent is prepared. The prepared magnetic biochar composite adsorbent is applied to a phosphorus-containing aqueous solution and shaken to adsorption equilibrium at a constanttemperature, and the magnetic biochar adsorbent can be separated from the solution under the action of an external magnetic field after the reaction is completed, so that phosphorus in water is removed, and the adsorbent is separated and recycled. The method has the advantages of low cost, readily available materials, simplicity and convenience in operation, high treatment efficiency and the like, resource utilization, magnetic rapid separation, recovery and reutilization of biomass are realized, the iron-modified precursor is environment-friendly and free of secondary pollution, and the adsorbent can be applied to removal and recovery of excessive phosphorus in industrial and agricultural wastewater.

The invention relates to a method of surface modification for environmentally-friendly carbon fibers. The method comprises sequentially immersing carbon fiber protofilament with acetone and nitric acid, and activating in an atmosphere of active gas. The modified carbon fiber obtained by the method is increased in surface oxygen-containing functional groups, improved in biocompatibility, greatly improved in biofilm formation amount and biofilm formation rate, and thus is an excellent biological carrier, and can not only directly purify water quality of rivers and lakes, but also be applied in industrial wastewater treatment and purification of raw water. The modification method of the carbon fiber is simple, environmentally friendly and wide in application prospects, can be used for directly purifying the water quality of the rivers and the lakes, and has important significance for lake eutrophication control, waste water purification, drinking-water safety, cultivation of algae as raw materials of bioenergy, and self restoration of water ecosystem.

The invention provides a preparation method of a hard carbon negative electrode material. The preparation method comprises steps as follows: aggregates and asphalt with a softening point being 200-280DEG C are mixed and kneaded at 300-380 DEG C, and a mixed material is obtained; the mixed material is subjected to molding and then is carbonized at 400-500 DEG C, and a precursor is obtained; the precursor is crushed and carbonized at 900-1400 DEG C, and the hard carbon negative electrode material is obtained. Compared with the prior art, the preparation method has the beneficial effects as follows: air and asphalt can be sufficiently and uniformly mixed in a mixing and kneading pot, a uniform cross-linking reaction is performed, oxygen-containing functional groups on the surface of asphaltare increased through oxidizing modification, and superior conditions are created for production of a large quantity of uniform lithium storage holes based on carbonization.

The invention discloses silver-loaded expanded graphite prepared by extra-large flaky graphite and preparation and application thereof. The expanded graphite is loaded with silver nanoparticles, and is prepared by the extra-large flaky graphite. Specific methods comprise an impregnating reducing method, a coating method and a spraying method; the impregnating reducing method adopts a non-toxic reducing agent to simultaneously reduce oxygen-containing functional groups and silver ions of the graphite; the coating method refers to coat a layer of silver nitrate solution onto the expanded graphite; the spraying method refers to spray the silver nitrate solution in a mist state onto the expanded graphite. The silver-loaded expanded graphite prepared by the extra-large flaky graphite through the several methods has the advantages that the bacteria sterilizing and inhibiting properties are excellent, the methods are simple, the operation is easy, the cost is low, and the methods are suitable for being popularized and applied; the silver-loaded expanded graphite prepared by the extra-large flaky graphite is used for wound dressings, the sticking with wounds is avoided in the use process, the pain is relieved, and the healing of the wounds is promoted; the bacteria sterilizing and inhibiting properties are excellent, and the infection of the wounds by bacteria is avoided.

The invention discloses a magnetic biochar composite adsorbent, a preparation method and an application thereof, and belongs to the field of biochar materials. The invention uses almond shell biomass and ferrous nitrate as raw materials, magnetizes through a thermal degradation process, reduces the particle size of the adsorbent through a mechanical ball milling process, and finally prepares a magnetic biochar composite adsorbent. Apply the prepared magnetic biochar composite adsorbent to phosphorus-containing aqueous solution, and shake it at a constant temperature until the adsorption equilibrium is reached. After the reaction is completed, under the action of an external magnetic field, the magnetic biochar adsorbent can be separated from the solution to complete the water purification process. Phosphorus removal and separation and recovery of adsorbent. The invention has the advantages of low cost, easy to obtain materials, easy operation and high treatment efficiency, and realizes resource utilization of biomass, rapid magnetic separation, recovery and reuse, and the iron-modified precursor is environmentally friendly and has no secondary pollution, and can be applied Removal and recovery of excess phosphorus in industrial and agricultural wastewater.

The invention discloses a method for preparing micro-mesopore XAD-2 by low-temperature plasma, and belongs to the technical field of semi-volatile organic gas treatment. According to the method, a high-voltage nanosecond bipolar narrow pulse plasma triggering power supply is used to drive a packed bed discharge to generate the low-temperature plasma to modify XAD-2, XAD-2 contains a large number of micro-mesopores is prepared, a specific surface of XAD-2 is increased, adsorption of PAHs pollutants and XAD-2 is enhanced, and dispersion of PAHs is effectively improved. At the same time, new acidic oxygen-containing groups are increased on the surface of XAD-2, surface chemisorption activity of XAD-2 is improved, and the adsorption performance for low concentration naphthalene of XAD-2 is remarkably improved. The method has the advantages of convenient operation and low cost, and can be used for preparing sampling products such as XAD-2 adsorption tubes for popularization and application.

The invention discloses a method for preparing para aramid paper from para aramid fibrid. The method concretely comprises the steps of carrying out surface treatment, defibering and dispersion on para aramid chopped fibers; carrying out ultrasonic treatment and pulping treatment on the para aramid fibrid; mixing the treated para aramid chopped fibers and the treated para aramid fibrid; adding anionic polyacrylamide into the mixed fibers to obtain aramid fiber pulp; shaping the aramid fiber pulp on an inclined wire paper machine; dehydrating, squeezing and drying; carrying out pre-hot-pressing on the dried aramid base paper, and then carrying out hot pressing by a hot press to obtain the para aramid paper. After the method for preparing the para aramid paper from the para aramid fibrid is adopted, the tensile strength, the tearing strength, the breaking strength, the wear resistance and the dielectricity of the para aramid paper are remarkably improved, and the para aramid paper can be taken as a structural material, an insulating material or an electronic material and is relatively widely applied to the fields of transportation, electronics and electric power, aerospace and the like.