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Appl. Sci. 2019, 9(4), 619;

Adsorption of Arsenic and Heavy Metals from Solutions by Unmodified Iron-Ore Sludge

VNU University of Science, Vietnam National University, 334 Nguyen Trai, Ha Noi 10053, Vietnam
Faculty of Engineering and Information Technology, University of Technology, Sydney (UTS), P.O. Box 123, Broadway, Sydney, NSW 2007, Australia
Author to whom correspondence should be addressed.
Received: 31 December 2018 / Revised: 1 February 2019 / Accepted: 6 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Innovative Approaches for Drinking- and Waste-Water Treatment)
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Arsenic and heavy-metal-contaminated environments are a major concern due to their negative impacts on exposed people and ecosystems. In this study, sludge from an iron-ore processing area was used as an adsorbent to remove As, Mn, Zn, Cd, and Pb from aqueous solutions. The adsorption capacity of target adsorbates was investigated in batch experiments of both single- and mixed-metal solutions. The batch studies show that the maximum Langmuir adsorption capacities of the heavy metals onto the adsorbent occurred in the order Pb > As > Cd > Zn > Mn, and ranged from 0.710 mg/g to 1.113 mg/g in the single-metal solutions and from 0.370 mg/g to 1.059 mg/g in the mixed-metal solutions. The results of the kinetic experiments are consistent with pseudo-first-order and pseudo-second-order models, with a slightly better fit to the latter. Adsorption performances indicate that iron-ore sludge can simultaneously adsorb multiple metal ions and is a promising adsorbent for the removal of toxic pollutants from water. View Full-Text
Keywords: adsorption; arsenic; heavy metal; removal; unmodified iron ore sludge adsorption; arsenic; heavy metal; removal; unmodified iron ore sludge

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Nguyen, K.M.; Nguyen, B.Q.; Nguyen, H.T.; Nguyen, H.T. Adsorption of Arsenic and Heavy Metals from Solutions by Unmodified Iron-Ore Sludge. Appl. Sci. 2019, 9, 619.

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