Vieira EG, Soares IV, Dias Filho NL, da Silva NC, Perujo SD, Bastos AC, Garcia EF, Ferreira TT, Fraceto LF, Rosa AH. Study on soluble heavy metals with preconcentration by using a new modified oligosilsesquioxane sorbent.
JOURNAL OF HAZARDOUS MATERIALS 2012;
237-238:215-222. [PMID:
22947184 DOI:
10.1016/j.jhazmat.2012.08.030]
[Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 07/31/2012] [Accepted: 08/14/2012] [Indexed: 06/01/2023]
Abstract
In this work, a new modified oligosilsesquioxane was prepared, characterized and evaluated for its heavy metal adsorption characteristics from aqueous solution. The material was characterized using infrared spectroscopy, X-ray diffractometry, solid-state (29)Si and (13)C nuclear magnetic resonance. Batch and column experiments were conducted to investigate for Fe (III), Cr (III), Cu (II), Cd (II), Pb (II) and Ni (II) removal from dilute aqueous solution by sorption onto modified oligosilsesquioxane. The results obtained in the flow experiments, showed a recovery of ca. 100% of the metal ions adsorbed in a column packed with 2.0 g of nanomaterial, using 3 mL of 1.0 mol L(-1) HCl solution as eluent. The detection limits for Fe, Cr, Cu, Cd, Pb, and Ni were 0.26, 0.33, 0.38, 0.41, 0.47 and 0.55 μg L(-1), respectively. The relative standard deviation values (n=12) were <4.82% for Fe, <4.12% for Cr, <3.79% for Cu, <3.03% for Cd, <4.02% for Pb and <2.65% for Ni. The proposed method was successfully applied to the analysis of environmental samples.
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