Study on soluble heavy metals with preconcentration by using a new modified oligosilsesquioxane sorbent

• Published in: Journal of hazardous materials 2012-10, Vol.237-238, p.215-222
• Main Authors: Vieira, Eduardo G., Soares, Isaac V., Filho, Newton L. Dias, da Silva, Niléia C., Perujo, Sérgio D., Bastos, Andréa C., Garcia, Edemir F., Ferreira, Tamires T., Fraceto, Leonardo F., Rosa, André H.
• Format: Article
• Language: English
• Subjects: Adsorption; Heavy metals; Isotherms; Metals, Heavy - chemistry; Nanostructures - chemistry; Oligosilsesquioxane; Organosilicon Compounds - chemistry; Preconcentration; Solubility; Water Pollutants, Chemical - chemistry; Water Purification - methods
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2012.08.030

► A modified oligosilsesquioxane sorbent was evaluated for its heavy metal adsorption. ► The adsorption capacities are much higher than those presented by other adsorbents. ► The method was successfully applied to the analysis of environmental samples. 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 29Si and 13C 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 2.0g of nanomaterial, using 3mL of 1.0molL−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 0.55μgL−1, respectively. The relative standard deviation values (n=12) were