Adsorption Of Chromium (VI) from an Aqueous Solution by the Nano-Zerovalent Iron/Activated Sepiolite Composite Adsorbent
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September 28, 2021
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Nano-Zerovalent Iron (nZVI) Sepiolite, Acid Activation, Macrocells, Composite, Dispersibility, Chromium(VI), Adsorption
Abstract
In this work, nano-zerovalent iron was deposited onto sepiolite (SEP) or acid-activated sepiolite (AAS) at different mass ratios in order to obtain efficient adsorbents for the removal of Cr(VI) from aqueous media. The composites were synthesized at support/nZVI ratios of 10:1, 5:1, 2.5:1, and 2:1. The removal of Cr(VI) was investigated at initial pH = 2. Through the fabrication, the support suspension was ultrasound treated to deagglomerate it before nZVI deposition. Results of TEM analysis showed that better dispersibility of nZVI was achieved with SEP-based composites, but AAS-based composites had higher removal efficiency. Higher efficiency of Cr(VI) removal was achieved when the higher content of nZVI was in the composites. AAS/nZVI composite with the ratio 2:1 provided the best removal of Cr(VI).
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