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- W2938972812 abstract "In this study, Fe-Zeolite-A as a phosphate adsorbent was synthesized by incorporating iron into the framework of Zeolite-A using ammonium iron citrate as the Fe3+source. The adsorption (in acidic condition) and desorption of phosphate (in alkaline condition) from an aqueous solution was repetitively performed for 18 times in batch test using Fe-Zeolite-A. The rate of adsorption and desorption of PO43- was much faster (consistently) than any of the reported study so far. The crystalline phase of pristine zeolite changed to amorphous after one adsorption phase and ultimately transformed into a highly amorphous phase after 18 adsorption/desorption cycles. It was due to the formation of more active sites on the surface of the zeolite by a release of atoms, breaking of bonds and deposition of metal and phosphate compounds on the surface (by rigorous acid/base treatment). Increase in active sites enhanced the sorption efficiency of Fe-Zeolite-A. With the help of microscopic and spectroscopic techniques, it was found that Fe3+, Al3+and Na+ metal ions of the Fe-Zeolite-A were involved in the adsorption/desorption of PO43-. Fe3+ ion exhibited ligand exchange mechanism by exchanging OH ions with PO43-. Al3+and Na+ exhibited interactions like precipitation, hydrogen bonding, and diffusion respectively to adsorb PO43-. Fe3+ metal ion dominated over other metal ions by ligand exchange principle, making the sorption process a highly reversible one. The adsorbent showed quantitative adsorption/desorption capacity even after continuous 18 cycles indicating a higher level of reusability." @default.
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- W2938972812 date "2019-07-01" @default.
- W2938972812 modified "2023-10-17" @default.
- W2938972812 title "Role of Fe, Na and Al in Fe-Zeolite-A for adsorption and desorption of phosphate from aqueous solution" @default.
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- W2938972812 doi "https://doi.org/10.1016/j.watres.2019.03.045" @default.
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