Assessment of Removal Efficiency of Ag2O-TiO2-Kaolinite Clay Hybrid Nanocomposite developed for the treatment of Mn(II), Fe (III), Pb(II) And Cu(II) in Mining Wastewater
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Date
2022-11-10
Journal Title
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Publisher
Nigerian Society of Chemical Engineers
Abstract
This study considered the synthesis of Ag2O-TiO2-kaolinite-clay nanocomposite by the combination of green and wet
impregnation method, which involves the reduction of silver nitrate and titanium tetra isopropoxide to nanoparticles
with aqueous extract of Parkia biglobossa leaf. These were then immobilized on acid-activated kaolinite clay. The
prepared nanomaterials' phase structure, morphology, chemical composition, and oxidation states were determined
using X-ray diffraction (XRD), high-resolution scanning electrode microscopy (HRSEM), and X-ray photoelectric
spectroscopy (XPS). The ability of the nanocomposite prepared to adsorb four heavy metal ions (Mn (II), Fe (III), Pb
(II), and Cu (II)) from mining wastewater was examined by varying the contact time. The XRD pattern of the Ag2OTiO2-
Clay reveals the synthesis of the rutile phase of TiO2 embedded in the kaolinite clay, while the HRSEM shows
an evenly distributed arrangement of hemispherical stacks of kaolinites. The states of oxidation of Ag and Ti revealed by
the XPS are +1 and +4 respectively either as binary or ternary nanocomposite. The Ag2O-TiO2-clay nanocomposite
adsorbed 99.85%, 97.85% 95.18%, and 40% of Fe(III), Mn (II), Cu(II) and Pb(II) ions at 120 min from the mining
wastewater respectively. The synergetic efforts of the Ag2O, TiO2, and acid-activated kaolinite clay was found
responsible for the adsorptive capability and post-separation possibility of the Ag2O-TiO2-clay nanocomposite.
Description
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Keywords
Adsorption, Characterisation, Kaoline, Mining-wastewater, Nanocomposite
Citation
Ajala, M.A., Abdulkareem, A.S. Kovo, A.S., Tijani, J.O. and Ajala, O.E. (2022): Assessment of removal efficiency of Ag2O-TiO2-Kaolinite clay hybrid nanocomposite developed for the treatment of Mn(II), Fe (III), Pb(II) And Cu(II) in mining wastewater. Nigerian Society of Chemical Engineers Proceedings, A.S. Osunleke & A. Giwa (Eds) 52, 137-142.