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Open AccessArticle

Effect of Dissolved Silicon on the Removal of Heavy Metals from Aqueous Solution by Aquatic Macrophyte Eleocharis acicularis

1
VNU University of Science, Vietnam National University, 334 Nguyen Trai, Ha Noi 10053, Vietnam
2
Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan
3
Faculty of Engineering and Information Technology, University of Technology, Sydney (UTS), PO Box 123, Broadway, Sydney, NSW 2007, Australia
*
Author to whom correspondence should be addressed.
Water 2019, 11(5), 940; https://doi.org/10.3390/w11050940
Received: 5 April 2019 / Revised: 1 May 2019 / Accepted: 2 May 2019 / Published: 4 May 2019
(This article belongs to the Special Issue Removal of Heavy Metals from Wastewater)
Silicon (Si) has been recently reconsidered as a beneficial element due to its direct roles in stimulating the growth of many plant species and alleviating metal toxicity. This study aimed at validating the potential of an aquatic macrophyte Eleocharis acicularis for simultaneous removal of heavy metals from aqueous solutions under different dissolved Si. The laboratory experiments designed for determining the removal efficiencies of heavy metals were conducted in the absence or presence of Si on a time scale up to 21 days. Eleocharis acicularis was transplanted into the solutions containing 0.5 mg L−1 of indium (In), gallium (Ga), silver (Ag), thallium (Tl), copper (Cu), zinc (Zn), cadmium (Cd), and lead (Pb) with various Si concentrations from 0 to 4.0 mg L−1. The results revealed that the increase of dissolved Si concentrations enhanced removal efficiencies of E. acicularis for Ga, Cu, Zn, Cd, and Pb, while this increase did not show a clear effect for In, Tl, and Ag. Our study presented a notable example of combining E. acicularis with dissolved Si for more efficient removals of Cu, Zn, Cd, Pb, and Ga from aqueous solutions. The findings are applicable to develop phytoremediation or phytomining strategy for contaminated environment. View Full-Text
Keywords: aqueous solution; Eleocharis acicularis; heavy metals; removal; silicon aqueous solution; Eleocharis acicularis; heavy metals; removal; silicon
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Nguyen, H.T.; Sakakibara, M.; Nguyen, M.N.; Mai, N.T.; Nguyen, V.T. Effect of Dissolved Silicon on the Removal of Heavy Metals from Aqueous Solution by Aquatic Macrophyte Eleocharis acicularis. Water 2019, 11, 940.

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