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Materials 2016, 9(8), 666; doi:10.3390/ma9080666

Removal of Cr(VI) from Water Using a New Reactive Material: Magnesium Oxide Supported Nanoscale Zero-Valent Iron

Department of Environmental and Chemical Engineering, Unversity of Calabria, Rende (CS) 87036, Italy
Academic Editor: Mady Elbahri
Received: 18 May 2016 / Revised: 1 August 2016 / Accepted: 2 August 2016 / Published: 6 August 2016
(This article belongs to the Special Issue Green Nanotechnology)
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Abstract

The chromium pollution of water is an important environmental and health issue. Cr(VI) removal by means of metallic iron is an attractive method. Specifically, nanoscopic zero valent iron (NZVI) shows great reactivity, however, its applicability needs to be further investigated. In the present paper, NZVI was supported on MgO grains to facilitate the treatments for remediation of chromium-contaminated waters. The performances and mechanisms of the developed composite, in the removal of hexavalent chromium, were investigated by means of batch and continuous tests. Kinetic studies, under different operating conditions, showed that reduction of Cr(VI) could be expressed by a pseudo second-order reaction kinetic. The reaction rate increased with the square of Fe(0) amount, while it was inversely proportional to the initial chromium concentration. The process performance was satisfactory also under uncontrolled pH, and a limited influence of temperature was observed. The reactive material was efficiently reusable for many cycles without any regeneration treatment. The performances in continuous tests were close to 97% for about 80 pore volume of reactive material. View Full-Text
Keywords: chromium removal; kinetic tests; water purification; zero valent iron chromium removal; kinetic tests; water purification; zero valent iron
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Siciliano, A. Removal of Cr(VI) from Water Using a New Reactive Material: Magnesium Oxide Supported Nanoscale Zero-Valent Iron. Materials 2016, 9, 666.

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