dc.creatorCHAVES, Marcia R. M.
dc.creatorDOCKAL, Edward R.
dc.creatorSOUZA, Rubem C. R.
dc.creatorBUECHLER, Pedro M.
dc.date.accessioned2012-10-19T01:48:14Z
dc.date.accessioned2018-07-04T14:52:28Z
dc.date.available2012-10-19T01:48:14Z
dc.date.available2018-07-04T14:52:28Z
dc.date.created2012-10-19T01:48:14Z
dc.date.issued2009
dc.identifierENVIRONMENTAL TECHNOLOGY, v.30, n.7, p.663-671, 2009
dc.identifier0959-3330
dc.identifierhttp://producao.usp.br/handle/BDPI/18848
dc.identifier10.1080/09593330902854160
dc.identifierhttp://dx.doi.org/10.1080/09593330902854160
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1615639
dc.description.abstractThis work describes the preparation and characterization of biogenic modified silica from rice hull ash and its use as a sorbent of cadmium ions. Thus, an agro-industrial residue has been used to produce a new adsorbent product which is able to remove toxic elements. Mesoporous biogenic silica was obtained by alkaline extraction of sodium silicate by hydrolysis with the sol-gel process, and it was modified with salen using 1,2-dichloroethane as a spacer. The surface area of the silica was measured by nitrogen adsorption/desorption analysis. Surface modification was measured by Fourier transform infrared spectroscopy. The degree of functionalization was obtained by elemental analysis. This work showed that biogenic modified silica can be produced in aqueous media from rice hull ash using a simple method, providing an alternative method for adsorbent preparation. Thermogravimetric analysis showed that the salen-modified silica is stable up to 209 C. The modified silica displays appropriate structural characteristics for an adsorbent. The cylindrical pores, open at both ends, allow free diffusion of cadmium ions to the adsorption sites on the silica surface. The surface modification increases cadmium adsorption on the silica surface 100-fold. The salen-modified silica showed specific adsorption for Cd2+ of 44.52 mg/g SiO2 at cadmium concentration of 100 mg/l.
dc.languageeng
dc.publisherTAYLOR & FRANCIS LTD
dc.relationEnvironmental Technology
dc.rightsCopyright TAYLOR & FRANCIS LTD
dc.rightsrestrictedAccess
dc.subjectbiogenic modified-silica
dc.subjectrice hull ash
dc.subjectsalen
dc.subjectadsorbent
dc.subjectpollution control
dc.titleBiogenic modified silica as a sorbent of cadmium ions: Preparation and characterization
dc.typeArtículos de revistas


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