Aluminum Substituted Cobalt Ferrite (Co-Al-Fe) Nano Adsorbent for Arsenic Adsorption in Aqueous Systems and Detailed Redox Behavior Study with XPS

Yaswanth K Penke; Ganapathi Anantharaman; Janakarajan Ramkumar; Kamal K Kar

doi:10.1021/acsami.6b16414

Aluminum Substituted Cobalt Ferrite (Co-Al-Fe) Nano Adsorbent for Arsenic Adsorption in Aqueous Systems and Detailed Redox Behavior Study with XPS

ACS Appl Mater Interfaces. 2017 Apr 5;9(13):11587-11598. doi: 10.1021/acsami.6b16414. Epub 2017 Mar 21.

Authors

Yaswanth K Penke¹, Ganapathi Anantharaman¹, Janakarajan Ramkumar¹, Kamal K Kar¹

Affiliation

¹ Materials Science Programme, ‡Department of Chemistry, §Department of Mechanical Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India.

PMID: 28257174
DOI: 10.1021/acsami.6b16414

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^-1 band indicate different As-OH_complexed and As-O_uncomplexed stretching 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^-1 for 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.

Keywords: ICP-OES; Raman and IR spectroscopy; XPS; adsorption; aluminum-substituted cobalt ferrite (Co−Al−Fe ternary oxide); arsenic [As(III) and As(V)].