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CN-121314542-B - Low-temperature-resistant persistent purification vehicle-mounted activated carbon and preparation method thereof

CN121314542BCN 121314542 BCN121314542 BCN 121314542BCN-121314542-B

Abstract

The application provides low-temperature-resistant persistent purification vehicle-mounted activated carbon and a preparation method thereof, and belongs to the technical field of activated carbon. The application constructs a self-driven chemical regeneration purification system by compounding two functional materials on the active carbon. The gallium doped zinc oxide nano rod generates instantaneous coke electric surface potential difference when the ambient temperature changes by utilizing the enhanced coke electric effect, and the instantaneous coke electric surface potential difference is used as an internal electrochemical driving force of a system, and cesium phosphotungstate coated cerium dioxide particles used as a pollutant oxidant improve the long-term stability of the zinc doped zinc oxide nano rod in a humid environment by converting soluble phosphotungstic acid into insoluble cesium salt, the coke electric surface potential difference induced by temperature fluctuation is distributed and conducted in a conductive network, and is beneficial to extracting electrons from a reduced center and recovering the high valence state of the reduced center to complete the online regeneration of the reduced center, and the synergistic effect enables the material to maintain the catalytic activity by utilizing the ambient temperature difference, so that the long-term and continuous purification under the condition of no light and low temperature is realized.

Inventors

  • LI HAITAO

Assignees

  • 东方万佳科技有限公司

Dates

Publication Date
20260508
Application Date
20251125

Claims (10)

  1. 1. The preparation method of the low-temperature-resistant persistent purification vehicle-mounted activated carbon is characterized by comprising the following steps of: The preparation method comprises the following steps of S1, immersing coconut shell activated carbon particles in zinc acetate ethanol solution, repeatedly immersing and airing, placing in nitrogen atmosphere, and performing heat treatment to obtain activated carbon substrate with seed crystals; S2, preparing a cerium nitrate solution, dropwise adding ammonia water to adjust the pH value, continuously stirring for reaction, centrifuging, washing to obtain a cerium hydroxide precursor, calcining the cerium hydroxide precursor to obtain cerium oxide nanoparticles, dispersing the cerium oxide nanoparticles in a mixed solvent to obtain a suspension B, dropwise adding a phosphotungstic acid solution to adjust the pH value to obtain a reaction solution C, stirring for adsorption, dropwise adding a cesium chloride solution to obtain a reaction solution D, stirring for reaction, centrifuging, washing, and drying to obtain cesium phosphotungstic acid coated cerium oxide nanoparticles, wherein the mixed solvent is a mixed solvent of deionized water and absolute ethyl alcohol; And S3, dispersing cesium phosphotungstate coated cerium dioxide nano particles in a mixed solvent to obtain a load suspension, adding active carbon loaded with gallium doped zinc oxide nano rods and conductive carbon black, carrying out ultrasonic stirring, taking out the immersed active carbon loaded with gallium doped zinc oxide nano rods, and carrying out vacuum drying to obtain the low-temperature-resistant persistent purification vehicle-mounted active carbon.
  2. 2. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon, which is characterized in that in S1: The mass ratio of the volume of the zinc acetate ethanol solution to the coconut shell activated carbon particles is (0.8-1.2) mL to 1g.
  3. 3. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon, which is characterized in that in S1: the total concentration of zinc nitrate and gallium nitrate in the modified solution is 0.02-0.05M; The molar ratio of zinc nitrate to gallium nitrate is (99-98): 1-2; the molar ratio of the total molar quantity of the zinc nitrate and the gallium nitrate to the hexamethylenetetramine is 1:1.
  4. 4. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon, which is characterized in that in S1: the mass volume ratio of the active carbon substrate with the seed crystal to the modifying solution is 1g (100-200) mL.
  5. 5. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon, which is characterized in that in S2: The volume ratio of deionized water to absolute ethyl alcohol in the mixed solvent is (3:7) - (5:5); And dropwise adding a phosphotungstic acid solution into the suspension B to adjust the pH to 2-3.
  6. 6. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon, which is characterized in that in S2: the concentration of the cesium chloride solution is 0.1-0.2M; the molar ratio of cesium chloride to phosphotungstic acid in the reaction liquid D is (1.2-1.5): 1.
  7. 7. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon according to claim 1, wherein in the step S3: the concentration of the load suspension is 10-20mg/mL.
  8. 8. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon according to claim 1, wherein in the step S3: The mass ratio of the cesium phosphotungstate coated cerium oxide nano particles to the active carbon loaded with the gallium-doped zinc oxide nano rods is 1 (10-15).
  9. 9. The method for preparing the low-temperature-resistant and lasting-effect purifying vehicle-mounted activated carbon according to claim 1, wherein in the step S3: the feeding amount of the conductive carbon black is 0.02-0.05% of the mass of the active carbon loaded with the gallium-doped zinc oxide nano rod.
  10. 10. The low-temperature-resistant persistent purification vehicle-mounted activated carbon prepared by the preparation method according to any one of claims 1-9.

Description

Low-temperature-resistant persistent purification vehicle-mounted activated carbon and preparation method thereof Technical Field The invention belongs to the technical field of activated carbon, and relates to low-temperature-resistant persistent purification vehicle-mounted activated carbon and a preparation method thereof. Background The quality of air in a vehicle has become an important hidden trouble affecting the health of drivers and passengers because of the sealed space and the sustained release of Volatile Organic Compounds (VOCs) such as formaldehyde, benzene series and the like by interior materials. At present, the air purification technology for the vehicle-mounted environment mainly comprises physical adsorption, chemical oxidation, catalytic decomposition and the like. The physical adsorption material represented by activated carbon has low cost, but has limited adsorption capacity, and once saturated, the physical adsorption material can fail and even be desorbed secondarily, so that the radical removal of pollutants can not be realized. In order to overcome the limitation of physical adsorption, chemical modified activated carbon impregnated with strong oxidants such as potassium permanganate is developed. However, such materials are essentially a consumable scavenger, the oxidant of which is rapidly depleted as it reacts with the contaminant, resulting in a very limited service life. In addition, under the high humidity condition which is common in the vehicle-mounted environment, the water-soluble oxidant also has risks of migration and loss, and the stability and durability of the performance of the oxidant are seriously affected. Although the photocatalysis technology can mineralize pollutants, the starting of the technology needs continuous ultraviolet irradiation, and the glass in the vehicle can isolate most ultraviolet rays, so that the technology has extremely low efficiency in practical vehicle-mounted application. Although some catalysts (such as noble metal or manganese-based catalysts) that can operate at low temperatures have been developed in recent years, they still face the problems that the catalytically active sites become poisoned by intermediates or water vapor over time, the activity gradually decays and cannot recover themselves, and it is difficult to meet the requirement of long-lasting effect. Disclosure of Invention Aiming at the problems, the application aims to provide low-temperature-resistant persistent purification vehicle-mounted activated carbon and a preparation method thereof. The application constructs a self-driven chemical regeneration purification system by compounding two functional materials on the active carbon. The gallium doped zinc oxide nano rod generates instantaneous coke electric surface potential difference when the ambient temperature changes by utilizing the enhanced coke electric effect, the instantaneous coke electric surface potential difference is used as an internal electrochemical driving force of a system, cerium dioxide particles coated by cesium phosphotungstate which are used as a pollutant oxidant are used for converting soluble phosphotungstic acid into insoluble cesium salt, so that the long-term stability of the cerium dioxide particles in a humid environment is improved, finally, the coke electric surface potential difference induced by temperature fluctuation is distributed and conducted in a conductive network through a charge transmission network constructed by conductive carbon black, and is beneficial to extracting electrons from a reduced center and recovering high valence state of the electrons to complete on-line regeneration of the cerium dioxide particles, and the synergistic effect enables the material to self maintain catalytic activity by utilizing the ambient temperature difference, so that long-term and lasting purification under the condition of no light and low temperature is realized. In order to achieve the purpose, the invention adopts the following technical scheme: in a first aspect, the invention provides a preparation method of low-temperature-resistant and effect-maintaining purification vehicle-mounted activated carbon, which comprises the following steps: The preparation method comprises the following steps of S1, immersing coconut shell activated carbon particles in zinc acetate ethanol solution, repeatedly immersing and airing, placing in nitrogen atmosphere, and performing heat treatment to obtain activated carbon substrate with seed crystals; S2, preparing a cerium nitrate solution, dropwise adding ammonia water to adjust the pH value, continuously stirring for reaction, centrifuging, washing to obtain a cerium hydroxide precursor, calcining the cerium hydroxide precursor to obtain cerium oxide nanoparticles, dispersing the cerium oxide nanoparticles in a mixed solvent to obtain a suspension B, dropwise adding a phosphotungstic acid solution to adjust the pH value to obtain a reaction soluti