ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The sequestral capture of fluoride, nitrate and phosphate by metal-doped and surfactant-modified hybrid clay materials

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, and Emmanuel I. Unuabonah

Redeemer’s University, Ede, Nigeria

E-mail: omorogiem@run.edu.ng

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.

Keywords: Anions ; Adsorption ; Water treatment ; Surface-modified ; Metal-doped Hybrid clay ; Carica papaya seeds 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-017-0290-9

Chemical Papers 72 (2) 409–417 (2018)