title: Magnetic zeolites: a new adsorbent for removal of metallic contaminants from water.
abstract: In this work the adsorption features of Na Y zeolite with the magnetic properties of iron oxides have been combined in a composite to produce a magnetic adsorbent. These magnetic composites can be used as an adsorbent for metallic contaminants in water and subsequently removed from the medium by a simple magnetic process. The zeolites:iron oxide magnetic composites, were prepared by using Na Y with weight ratio of 3:1 and were characterized by powder X-ray diffraction (XRD), magnetization measurements, chemical analyses, N(2) adsorption isotherms and Mössbauer spectroscopy. Nitrogen adsorption isotherms showed that the surface area decreased from 505 m(2)g(-1) for the pure Na Y to 353 m(2)g(-1) for the Na Y:Fe oxide 3:1 composite. The adsorption isotherms of metal ions Cr(3+), Cu(2+) and Zn(2+) from aqueous solution onto the composites also showed that the presence of iron oxide does not affect the adsorption capacity.
authors.affiliation: Departamento de Química, Universidade Federal de Lavras, Caixa Postal 37, CEP 37200-000, Lavras-MG, Brazil. lcao@uri.com.br
authors.forename: Luiz C A
authors.initials: LC
authors.lastname: Oliveira
authors.forename: Diego I
authors.initials: DI
authors.lastname: Petkowicz
authors.forename: Alessandra
authors.initials: A
authors.lastname: Smaniotto
authors.forename: Sibele B C
authors.initials: SB
authors.lastname: Pergher
mesh_terms: D000327:Adsorption; D002857:Chromium / Q000302:isolation & purification*; D003300:Copper / Q000302:isolation & purification*; D008280:Magnetics; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*; D015032:Zinc / Q000302:isolation & purification*
chemical_list: D014873:Water Pollutants; D002857:Chromium; D017641:Zeolites; D003300:Copper; D015032:Zinc