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Metals 2017, 7(5), 169; doi:10.3390/met7050169

Diatoms and Their Capability for Heavy Metal Removal by Cationic Exchange

1
Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca–Tulancingo, Km 4.5 s/n, Mineral de la Reforma, Hidalgo C.P. 42184, Mexico
2
Área Académica de Química en Alimentos, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca–Tulancingo, Km 4.5 s/n, Mineral de la Reforma, Hidalgo C.P. 42184, Mexico
*
Author to whom correspondence should be addressed.
Academic Editors: Seung-Mok Lee and Jae-Kyu Yang
Received: 23 February 2017 / Revised: 4 May 2017 / Accepted: 8 May 2017 / Published: 12 May 2017
(This article belongs to the Special Issue Heavy Metal Determination and Removal)
View Full-Text   |   Download PDF [3064 KB, uploaded 12 May 2017]   |  

Abstract

This work shows the physicochemical behavior of two different diatoms from the country of Mexico (State of Jalisco and Hidalgo) with similar compositions. These were used to eliminate toxic cations from a synthetic solution containing 5.270 mg As3+/L; 4.280 mg Ag+/L; 3.950 mgNi2+/L; 4.090 mg Cr6+/L; and 4.081 mg Pb2+/L. These diatoms were used as filters, and the quantity of cations remaining in the solution after filtering was measured. According to the most important results found, for the recovery of metals, both minerals achieved arsenic, silver, lead, and nickel recoveries up to 95%, and lower than 10% for chromium. This could be due to the absence of an environment to reduce Cr6+ to Cr3+. On the other hand, it was observed that there was no selectivity during the recovery of the other cations present in the solution. According to efficiency of interchange, the mineral from Hidalgo is slightly better than the mineral from Jalisco for the removal of arsenic, lead, and silver. For nickel, and particularly Cr6+, the efficiency is higher for the sample from Jalisco. View Full-Text
Keywords: diatomite; ionic exchange; metals removal; heavy metals diatomite; ionic exchange; metals removal; heavy metals
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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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MDPI and ACS Style

Hernández-Ávila, J.; Salinas-Rodríguez, E.; Cerecedo-Sáenz, E.; Reyes-Valderrama, M.I.; Arenas-Flores, A.; Román-Gutiérrez, A.D.; Rodríguez-Lugo, V. Diatoms and Their Capability for Heavy Metal Removal by Cationic Exchange. Metals 2017, 7, 169.

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