Study On Adsorption Properties Of Chlorine Of NaY And Modified NaY Molecular Sieve

The discovery, preparation, application and harm of chlorine were described in this paper. The structure and adsorption properties of zeolite molecular sieve and its application in other areas were introduced, and the research progress of chlorine adsorption properties was reviewed. Traditional NaY molecular was modified by ammonium nitrate and EDTA respectively, and adsorption properties of chlorine on NaY and modified NaY was studied by the P-C-T apparatus. Stability of three samples were characterized and analyzed by XRD, FTIR and SEM. The conclusions are as following.1.The adsorption curves of NaY and NaY through the modification of ammonium nitrate and H4EDTA at0℃,30℃and50℃is accord with the langmuir equation, belonging to the physical adsorption. The chlorine absorption amount of the three samples increased with the temperature falling and pressure rising. Temperature and pressure are important factors influenced chlorine adsorption quantity in molecular sieves.2. The order for the adsorption capacities of three molecular sieves were NaY(H4EDTA)>NaY(NH4NO3)>NaY at0℃,30℃,50℃and0.20MPa. The adsorption quantity of chlorine is affected by ratio of SiO2/AlO2, surface cationic and skeleton structure.3. Adsorption amount of chlorine on the three samples was tested repeatedly at30℃. With the increasing of adsorption time, the adsorption amount of NaY(H4EDTA) changed hardly, the NaY changed very little, but adsorption capacity of NaY(NH4NO3) decreased greatly. Stability order of three samples after adsorbing is NaY(H4EDTA)>NaY> NaY(NH4NO3).4. XRD、 FTIR and SEM of three samples showed that framework structure and surface morphology of modified NaY molecular sieves were consistent with original NaY. With the increase of adsorption time, diffraction peak of NaY(H4EDTA) and original NaY were clearly visible, and the changes of adsorption peak of FTIR were very small, the surface is somewhat rough. However, the diffraction peak of NaY(NH4NO3) already did not exist after adsorption for eight times, the surface presented partial cracks.5. According to contrast and analysis adsorption amount of chlorine and cycle adsorption dates, NaY(H4EDTA) is the best adsorbent of the three samples for chlorine adsorption in industry.