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Environmental Engineering Research 2004;9(6): 249-255. DOI: https://doi.org/10.4491/eer.2004.9.6.249
Pb AND Cr(VI) REMOVAL USING Fe-LOADED ZEOLITE
Seunghak Lee, Kwanghun Lee, and Junboum Park
School of Civil, Urban & Geosystem Engineering, Seoul National University, Seoul 151-742, Korea
Corresponding Author: Junboum Park ,Tel: +82-2-880-8356, Fax: +82-2-875-6933 , Email: junbpark@snu.ac.kr
Received: March 6, 2004;  Accepted: October 7, 2004.
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ABSTRACT
Current research focuses on Pb and Cr(VI) removal in water by a newly developed material having both abilities of sorption and reduction. The material was derived from zeolite modified by ferrous chloride followed by reduction with sodium borohydride. XRF analysis has shown that Fe content in Fe-loaded zeolite ("ZanF") increased by 1.8 times than that of pure zeolite. For the removal of Pb with initial concentration of 2-15 mM, Fe-loaded zeolite showed over 90% removal efficiency, which was similar with that of pure zeolite. During Pb removal desorption of Fe developed in Fe-loaded zeolite was not significantly detected, which indicated that Fe in Fe-loaded zeolite was stable against the cation exchange reaction. For Cr(Vl) removal, 0.5 mM of Cr(Vl) was rapidly reduced by Fe-loaded zeolite below detection limit within 5 hrs. However, Cr(VI) in pure zeolite maintained constant, which indicated that Fe developed in Fe-loaded zeolite is responsible for Cr(VI) removal observed. From the test results, Fe-loaded zeolite was proven to have high Pb sorption capacity and rapid Cr(Vl) reduction ability in a single medium. And Fe-loaded zeolite could possibly find its use in the field applications as permeable reactive barrier for treating the contaminated water simultaneously with cationic and anionic heavy metals.
Keywords: Fe-loaded zeolite | Pb | Cr(Vl) | Permeable Reactive Barriers(PRBs)
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