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Open AccessArticle

Synthesis of Hematite Nanodiscs from Natural Laterites and Investigating Their Adsorption Capability of Removing Ni2+ and Cd2+ Ions from Aqueous Solutions

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Postgraduate Institute of Science (PGIS), University of Peradeniya, Peradeniya 22400, Sri Lanka
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Department of Chemical & Process Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya 22400, Sri Lanka
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Sri Lanka Institute of Nanotechnology (SLINTEC), Mahenwatta, Pitipana, Homagama 10206, Sri Lanka
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Department of Civil Engineering, Faculty of Engineering, University of Peradeniya, Peradeniya 22400, Sri Lanka
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Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya 22400, Sri Lanka
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Department of Chemistry, California State University, Stanislaus, One University Circle, Turlock, CA 95382, USA
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Department of Polymer Science, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda 10100, Sri Lanka
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Department of Nano Science Technology, Faculty of Technology, Wayamba University of Sri Lanka, Kuliyapitiya 60200, Sri Lanka
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Department of Chemistry, Faculty of Graduate Studies, University of Kelaniya, Kelaniya 11300, Sri Lanka
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Department of Biosystems Technology, Faculty of Technology, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10100, Sri Lanka
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Author to whom correspondence should be addressed.
J. Compos. Sci. 2020, 4(2), 57; https://doi.org/10.3390/jcs4020057
Received: 23 March 2020 / Revised: 10 May 2020 / Accepted: 14 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Metal Composites)
In this work, disc-like hematite (Fe2O3) nanoparticles were prepared using a readily available inexpensive earth material, ferruginous laterite, via a low-cost synthesis route. Prepared hematite nanoparticles were characterized using X-Ray diffraction (XRD), inductively coupled plasma mass spectroscopy (ICP-MS), particle size analyzer (PSA), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and nitrogen adsorption-desorption analyzer. The performance of hematite nanoparticles was evaluated as a heavy metal ion adsorbent. Batch adsorption experiments were conducted to study the adsorption behaviour of Ni2+ and Cd2+ ions as a function of the amount of adsorbent, contact time, and pH. Adsorption data fitted to the linearized Langmuir and Freundlich kinetic models were compared and discussed. The correlation coefficient (R2) was used to determine the best fit kinetic model. Our data fitted the Langmuir kinetic model well and the highest adsorption efficiencies were found to be 62.5 mg/g for Ni2+ and 200 mg/g for Cd2+, respectively. Due to high surface area, pore volume with active sites, and sorption capabilities, hematite nanoparticles can be used as efficient and economical nano-adsorbents for the removal of Ni2+ and Cd2+ ions from industrial wastewater. View Full-Text
Keywords: hematite nanoparticles; adsorption; water treatment; heavy metals hematite nanoparticles; adsorption; water treatment; heavy metals
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Gunawardhana, B.P.N.; Gunathilake, C.A.; Dayananda, K.E.D.Y.T.; Dissanayake, D.M.S.N.; Mantilaka, M.M.M.G.P.G.; Kalpage, C.S.; Rathnayake, R.M.L.D.; Rajapakse, R.M.G.; Manchanda, A.S.; Etampawala, T.N.B.; Weerasekara, B.G.N.D.; Fernando, P.N.K.; Dassanayake, R.S. Synthesis of Hematite Nanodiscs from Natural Laterites and Investigating Their Adsorption Capability of Removing Ni2+ and Cd2+ Ions from Aqueous Solutions. J. Compos. Sci. 2020, 4, 57.

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