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Water 2017, 9(9), 690; https://doi.org/10.3390/w9090690

Wheat Straw as a Bio-Sorbent for Arsenate, Chromate, Fluoride, and Nickel

1
Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Campus Lugo, Universidade de Santiago de Compostela, 27002 Lugo, Spain
2
Center for Agricultural Sciences, Marechal Cândido Rondon, Paraná, Rua Pernambuco, 1777, CEP 85960-000, State University of West Paraná, 85819-110 Cascavel, Brazil
3
Department of Plant Biology and Soil Science, Faculty of Sciences, Campus Ourense, Universidade de Vigo, 32004 Ourense, Spain
*
Author to whom correspondence should be addressed.
Received: 2 July 2017 / Revised: 5 September 2017 / Accepted: 7 September 2017 / Published: 9 September 2017
(This article belongs to the Special Issue Heavy Metals and Potentially Toxic Elements (PTEs) in Water)
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Abstract

Batch-type experiments were used to study As(V), Cr(VI), F, and Ni2+ sorption/desorption on wheat straw. For the lowest concentration added (0.5 mmol·L−1), the sorption sequence was F > Ni2+ > Cr(VI) >> As(V) (93%, 61%, 29%, 0.3%), but changed to Ni2+ > F > Cr(VI) >> As(V) when 3.0 and 6.0 mmol·L−1 were added (with 65%, 54%, 25%, 0%, and 68%, 52%, 27%, 0% sorption, respectively). Overall, As(V) showed the lowest sorption, whereas it was 25–37% for Cr(VI), 61–68% for Ni2+, and 52–93% for F. For As(V), pH in the equilibrium solution was always above the pH of the point of zero charge (pHPZC) for wheat straw, decreasing sorption efficiency. For Cr(VI), pH was below pHPZC, but not enough to reach high sorption. For F, pH in the equilibrium was above pHPZC, which could reduce sorption. For Ni2+, pH in the equilibrium was always below pHPZC, which made sorption difficult. The satisfactory fitting of Cr(VI), F, and Ni2+ data to the Freundlich model suggests multilayer-type adsorption. Desorption was high for F, whereas Ni2+ showed the lowest desorption. This research could be especially relevant when focusing on the use of wheat straw as a bio-sorbent, and in cases where straw mulching is used. View Full-Text
Keywords: As(V); Cr(VI); F; Ni2+; retention/release; straw As(V); Cr(VI); F; Ni2+; retention/release; straw
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Romar-Gasalla, A.; Coelho, G.F.; Nóvoa-Muñoz, J.C.; Arias-Estévez, M.; Fernández-Sanjurjo, M.J.; Álvarez-Rodríguez, E.; Núñez-Delgado, A. Wheat Straw as a Bio-Sorbent for Arsenate, Chromate, Fluoride, and Nickel. Water 2017, 9, 690.

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