The Sequestral Capture of fluoride, nitrate and phosphate by metal-doped and surfactant-modified Hybrid Clay Materials
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Date
2017
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Chemical Papers, Springer
Abstract
Toxic anions removal for increased access to potable water remains a problem that has not been adequately addressed. This study, reports the successful preparation and modification of kaolinite-papaya seed based adsorbents under vacuum (VHYCA) for the removal of Nitrate (NO3-), Fluoride (F-) and Phosphate (PO43-).
Modified adsorbents via metal-doping using Zinc were more efficient in removing these anions from aqueous
solution compared with surfactant-modified adsorbents. However, both type of adsorbents showed a higher preference for NO3- removal with Zn-VHYCA and FeVHYCA adsorbents having 98 and 85% removal of the
anion from aqueous solution, respectively. The removal of F- and PO43- was best achieved by Ortho-phenylenediamine (OP) and N,N,N0,N0-Tetramethyl-1,4-phenyldiaminedihydrochloride (TPD) modified VHYCA, respectively. However, Zn-VHYCA adsorbent showed comparable results with TPD-VHYCA in the removal of PO43- from aqueous solution. Overall, the metal-doped hybrid clay adsorbents showed better efficiency for the removal of anions than the surfactant-modified hybrid clay adsorbents.
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Keywords
Anions, Adsorption, Water Treatment, Metal-doped Hybrid Clay, Carica papaya seeds
Citation
19