title: An EXAFS study on the adsorption structure of phenyl-substituted organoarsenic compounds on ferrihydrite.
abstract: Adsorption structures of mono- and diphenyl substituted organoarsenic compounds (PAA and DPAA, respectively) on ferrihydrite were analyzed by extended X-ray absorption fine structure (EXAFS), which suggested that PAA and DPAA form inner-sphere complexes with ferrihydrite regardless of their bulky functional groups. In addition, coexistence of two types of inner-sphere complex modes, i.e. bidentate-binuclear and monodentate surface complexes was suggested by EXAFS fitting with two type of the As-Fe shell.
authors.affiliation: Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Tanaka
authors.forename: Yoko S
authors.initials: YS
authors.lastname: Togo
authors.forename: Noriko
authors.initials: N
authors.lastname: Yamaguchi
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Takahashi
mesh_terms: D000327:Adsorption; D001152:Arsenicals / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry*; D006801:Humans; D008958:Models, Molecular; D011789:Quantum Theory; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods; D056928:X-Ray Absorption Spectroscopy
chemical_list: D001152:Arsenicals; D005290:Ferric Compounds; D014874:Water Pollutants, Chemical; C020979:benzenearsonic acid; C092844:ferric oxyhydroxide; C493087:diphenylarsinic acid
keywords: Adsorption structure; Diphenylarsinic acid (DPAA); Extended X-ray absorption fine structure (EXAFS); Ferrihydrite; Organic arsenic; Phenylarsonic acid (PAA); Quantum chemical calculation