ISSN: 1859 - 2872
Initial study of the column adsorption of radioactive iodine onto mixture of composite material ZSM-5/PVA and biochar/PVA
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Abstract
Objective: This study focuses on the investigation of the 131I adsorption from aqueous solution using biochar/PVA and ZSM-5 zeolite/PVA composite material, resulting in determining the approriate ratio mass of biochar/ZSM-5 zeolite when treating real wastewater and indicating the reduction of the time storage of 131I radioactive waste water after the column adsorption. Subject and method: The adsorption column consist of biochar/PVA and ZSM-5 zeolite/PVA composite materials with the different rates of biochar/ZSM-5 zeolite. By using the column adsorption, fabricated composite materials have spherical granules with various rates of biochar/ZSM-5 zeolite mass (9:1, 8:2, 7:3, 6:4). After that, the aqueous solutions of radioactive 131I with the same initial concentration are slowly flowed through the column. The radioactivities of 131I before and after the uptake are determined to evaluate the column adsorption capacity after the iterations of 1, 2 or and 3 times. Result: The initia results show that the biochar:ZSM-5 zeolite mass ratio ranging from 6:4 to 9:1 has no significant difference in the ability to absorb 131I under the surveyed conditions. The adsorption efficiency of 131I by the filter column reached approximately 40% after 3 cycles. This result also shows thar after 3 cycles, the adsorption capacity of 131I has not shown signs of saturation. Conclusion: The mixture of biochar/PVA and ZSM-5 zeolite/PVA composite materials has the ability to treat radioactive iodine and shows potential for application in treating wastewater containing radioactive iodine in hospitals that treat thyroid cancer patients with radioactive drugs (131I).
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References
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