title: Aluminum Substituted Cobalt Ferrite (Co-Al-Fe) Nano Adsorbent for Arsenic Adsorption in Aqueous Systems and Detailed Redox Behavior Study with XPS.
abstract: Arsenic [As(III) and As(V)] adsorption on aluminum substituted cobalt ferrite (Co-Al-Fe) ternary metal oxide adsorbent is reported by means of qualitative and quantitative spectroscopy tools. IR and Raman active signals were observed around 810-920 cm-1band indicate different As-OHcomplexedand As-Ouncomplexedstretching vibrations on to the adsorbent. The adsorption behavior of arsenic (III and V) onto these adsorbents is studied as a function of contact time, different concentrations, and pH conditions. The kinetics study on adsorption were performed to understand nature of adsorption which supports the Pseudo Second Order (PSO) model. The adsorption isotherms study indicates Freundlich type of adsorption. The maximum adsorption capacity of Co-Al-Fe adsorbent is observed around 130 and 76 mg g-1for As(III) and As(V) systems, respectively. Detailed XPS study of As 3d, Fe 2p, Co 2p, and O 1s spectra has been reported in explaining the redox behavior and ligand exchange reactions in supporting arsenic adsorption mechanism.
authors.affiliation: Materials Science Programme, ‡Department of Chemistry, §Department of Mechanical Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India.
authors.forename: Yaswanth K
authors.identifier: http://orcid.org/0000-0001-5392-5697
authors.initials: YK
authors.lastname: Penke
authors.affiliation: Materials Science Programme, ‡Department of Chemistry, §Department of Mechanical Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India.
authors.forename: Ganapathi
authors.initials: G
authors.lastname: Anantharaman
authors.affiliation: Materials Science Programme, ‡Department of Chemistry, §Department of Mechanical Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India.
authors.forename: Janakarajan
authors.initials: J
authors.lastname: Ramkumar
authors.affiliation: Materials Science Programme, ‡Department of Chemistry, §Department of Mechanical Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India.
authors.forename: Kamal K
authors.initials: KK
authors.lastname: Kar
keywords: ICP-OES; Raman and IR spectroscopy; XPS; adsorption; aluminum-substituted cobalt ferrite (Co−Al−Fe ternary oxide); arsenic [As(III) and As(V)]