title: Raman and IR spectroscopic investigation of As adsorbed on Mn3O4 magnetic composites.
abstract: Raman and IR spectra were recorded of the As-loaded Mn(3)O(4) magnetic composites obtained from the adsorption studies performed with As(III). XANES results for the composite after As(III) removal tests show that the As adsorbed is at the oxidized arsenic form, As(V). Monodentate and bidentate surface complexes are suggested for arsenic adsorption onto the composite (5-16 mg/g). Precipitation of manganese arsenate is observed for high As loading (35 mg/g).
authors.affiliation: Department of Metallurgical and Materials Engineering - Universidade Federal de Minas Gerais (UFMG), 31270-901 - Belo Horizonte, Brazil.
authors.forename: Gabriela C
authors.initials: GC
authors.lastname: Silva
authors.forename: Fabiana S
authors.initials: FS
authors.lastname: Almeida
authors.forename: Maria Sylvia S
authors.initials: MS
authors.lastname: Dantas
authors.forename: Angela M
authors.initials: AM
authors.lastname: Ferreira
authors.forename: Virginia S T
authors.initials: VS
authors.lastname: Ciminelli
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D060328:Magnetic Phenomena; D017895:Manganese Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013696:Temperature; D056928:X-Ray Absorption Spectroscopy
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D001151:Arsenic