The sequestral capture of fluoride,nitrate and phosphate by metal-doped and surfactant-modified hybrid clay materials |
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| Authors: | Martins O. Omorogie Foluso O. Agunbiade Moses O. Alfred Olaronke T. Olaniyi Thompson A. Adewumi Ajibola A. Bayode Augustine E. Ofomaja Eliazer B. Naidoo Chukwunonso P. Okoli Timothy A. Adebayo Emmanuel I. Unuabonah |
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| Affiliation: | 1.Environmental and Chemical Processes Research Laboratory, Department of Chemical Sciences,Redeemer’s University,Ede,Nigeria;2.Adsorption and Catalysis Research Laboratory, Department of Chemistry,Vaal University of Technology,Vanderbijlpark,South Africa;3.Analytical/Environmental Chemistry Unit, Department of Chemistry/Biochemistry,Federal University,Ndufu-Alike Ikwo,Nigeria;4.Department of Chemistry,University of Lagos,Akoka,Nigeria |
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| 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 (PO4 3?). 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 Fe-VHYCA adsorbents having 98 and 85% removal of the anion from aqueous solution, respectively. The removal of F? and PO4 3? was best achieved by Ortho-phenylenediamine (OP) and N,N,N′,N′-Tetramethyl-1,4-phenyldiaminedihydrochloride (TPD) modified VHYCA, respectively. However, Zn-VHYCA adsorbent showed comparable results with TPD-VHYCA in the removal of PO4 3? 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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