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Open AccessArticle

Ultrasound Assisted Adsorptive Removal of Cr, Cu, Al, Ba, Zn, Ni, Mn, Co and Ti from Seawater Using Fe2O3-SiO2-PAN Nanocomposite: Equilibrium Kinetics

1
Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, Johannesburg 17011, South Africa
2
DST/Mintek Nanotechnology Innovation Centre, Johannesburg 17011, South Africa
3
DST/NRF SARChI Chair: Nanotechnology for Water, University of Johannesburg, Doornfontein 2028, South Africa
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(5), 133; https://doi.org/10.3390/jmse7050133
Received: 6 March 2019 / Revised: 25 April 2019 / Accepted: 3 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Nanomaterials Applied in Water Treatments)
This work reports the preparation and application of Fe2O3-SiO2-PAN nanocomposite for the removal of Cr3+, Cu2+, Al3+, Ba2+, Zn2+, Ni2+, Mn2+, Co2+, and Ti3+ from seawater. X-ray diffraction (XRD), scanning electron microscope/energy dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscope (TEM), and Brunauer-Emmett-Teller (BET) characterized the synthesized composite. The following experimental parameters (Extraction time, adsorbent mass and pH) affecting the removal of major and trace metals were optimized using response surface methodology (RSM). The applicability of the RSM model was verified by performing the confirmation experiment using the optimal condition and the removal efficiency ranged from 90% to 97%, implying that the model was valid. The adsorption kinetic data was described by the pseudo-second order model. The applicability of the materials was tested on real seawater samples (initial concentration ranging from 0.270–203 µg L−1) and the results showed satisfactory percentage efficiency removal that range from 98% to 99.9%. The maximum adsorption capacities were found to be 4.36, 7.20, 2.23, 6.60, 5.06, 2.60, 6.79, 6.65 and 3.00 mg g−1, for Cr3+, Cu2+, Al3+, Ba2+, Zn2+, Ni2+, Mn2+, Co2+, and Ti4+, respectively. View Full-Text
Keywords: in-situ synthesis; Fe2O3-SiO2-PAN nanocomposite; potential toxic metals; adsorption desalination; equilibrium kinetics in-situ synthesis; Fe2O3-SiO2-PAN nanocomposite; potential toxic metals; adsorption desalination; equilibrium kinetics
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MDPI and ACS Style

Ramutshatsha-Makhwedzha, D.; Ngila, J.C.; Ndungu, P.G.; Nomngongo, P.N. Ultrasound Assisted Adsorptive Removal of Cr, Cu, Al, Ba, Zn, Ni, Mn, Co and Ti from Seawater Using Fe2O3-SiO2-PAN Nanocomposite: Equilibrium Kinetics. J. Mar. Sci. Eng. 2019, 7, 133.

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