2results about How to "Enhance surface alkalinity" patented technology

The invention discloses high-nitrogen-doped layered porous waxberry kernel-based activated carbon and a preparation method and application thereof.The preparation method of the activated carbon comprises the steps that waxberry kernels are washed with water, dried, crushed into particles, screened, soaked in a nitric acid solution for pretreatment, washed and dried to obtain a pre-oxidized precursor, then the pre-oxidized precursor is mixed with a nitrogen source and a potassium activating agent, and the high-nitrogen-doped layered porous waxberry kernel-based activated carbon is obtained. The preparation method comprises the following steps: firstly, preparing a one-step impregnated nitrogen-doped carbon precursor, heating, stirring and drying in deionized water to obtain the one-step impregnated nitrogen-doped carbon precursor, then calcining and activating in a mixed atmosphere of nitrogen and ammonia gas, finally soaking in a hydrochloric acid solution, washing, filtering, drying and screening to obtain the final finished product nitrogen-doped layered porous activated carbon. According to the activated carbon, the waxberry kernels serve as raw materials, urea and ammonia gas serve as nitrogen sources, KHCO3 serves as an activating agent, the activated carbon is heated, stirred and reacted in water and then calcined and activated, high-temperature activation and synergistic nitrogen doping are achieved, and compared with a traditional nitrogen doping mode, the activated carbon is higher in nitrogen doping rate, richer in specific surface area and pore structure and obvious in performance advantage.

The invention discloses a method for preparing nitrogen-doped biochar based on one-step co-pyrolysis of thermosetting resin and biomass. The method comprises the following steps: uniformly mixing urea resin solid powder, biomass and an activating agent; placing the mixed material in inert atmosphere protection, and carrying out temperature programming to 500-800 DEG C to carry out co-pyrolysis reaction; after the pyrolysis is completed, cooling, washing and drying to obtain the carbon material. According to the invention, one-step co-pyrolysis of urea-formaldehyde resin and biomass is utilized, effective doping of nitrogen element is realized at a relatively low temperature, in-situ molding of the material is realized by utilizing the thermosetting characteristic of urea-formaldehyde resin, and a molded carbon material with good mechanical strength can be obtained without an additional binder; the alkalescent potassium salt is selected as the activating agent and is environment-friendly, the prepared carbon material has high specific surface area and ultrahigh microporosity, the CO2 adsorption capacity is remarkably improved, the process is simple, and the energy consumption is low.