Study On Nano-porous Materials For Radon Adsorption Properties

Objective:To discuss meta-organic frameworks nanoporous materials for radioactive radon adsorption, and analyze differences of radon adsorption for structures of the adsorbents, this could provide experimental evidence for synthetizing much more nanoporous materials of radon adsorption.Methods:1.ZIF-8 is simulated for radon adsorption by computer, and filed data has been simulated by GCMC.2.Solvent-thermal method was used for the synthesis of the ZIF-8. Nanoscale ZIF-8 was synthesized and characterized by XRD, TGA and ASAP.3.Using a standard radon adsorption analyzer was measured with active and passive adsorption methods at optimum conditions. Direct α, β and γ spectrometer measurements for radon adsorption provide comparable results of adsorption.4.The experiments as ZIF-8 was carried out for reusing and studied for structural stability.5.Activated carbon(AC) was oxidized by ammonium sulfate and oxidation activated carbon(OAC) was gotten. Under the same conditions, AC and OAC were carried out radon adsorption respectively, and the results were tested by α and γ spectrometer.Results:1. The relationship between radon adsorption and the pressure changes was gotten by GCMC simulation, and GCMC simulation also gave the RDF graph for further understanding adsorption.2.⑴Under radon concentration around 100000 Bq, 28.6Bq was the maximum when the 160 mg ZIF-8 adsorbed 30 hours by the passive adsorption.⑵Under radon concentration around 5000 Bq, 1.06494 Bq and 1.05517 Bq were tested by α spectrometer when 200 mg ZIF-8 was used and reused to radon adsorption respectively.⑶Under radon concentration around 5000 Bq, 8.653 Bq and 8.360 Bq were tested by γ spectrometer when 1g ZIF-8 was used and reused to radon adsorption respectively.3. OAC was gotten and characterized by FT-IR spectroscopy、elemental analysis、surface area and aperture measurement. Microstructure of AC and OAC has significant differences.4. Adsorption differences were analyzed by microscopic properties of the adsorbent.Conclusions:1.The possibility for ZIF-8 adsorbing radon was confirmed by the simulation methods and experiments.2. ZIF-8 not only can adsorb radon, but also could reuse for radon adsorption.3. The structural changes of sorbent could influence adsorption of radon.