title: Arsenic (III) adsorption on iron acetate coated activated alumina: thermodynamic, kinetics and equilibrium approach.
abstract: The adsorption potential of iron acetate coated activated alumina (IACAA) for removal of arsenic [As (III)] as arsenite by batch sorption technique is described. IACAA was characterized by XRD, FTIR, EDAX and SEM instruments. Percentage adsorption on IACAA was determined as a function of pH, contact time and adsorbent dose. The study revealed that the removal of As (III) was best achieved at pH =7.4. The initial As (III) concentration (0.45 mg/L) came down to less than 0.01 mg/L at contact time 90 min with adsorbent dose of 1 g/100 mL. The sorption was reasonably explained with Langmuir and Freundlich isotherms. The thermodynamic parameters such as ΔG0, ΔH0, ΔS0 and Ea were calculated in order to understand the nature of sorption process. The sorption process was found to be controlled by pseudo-second order and intraparticle diffusion models.
authors.affiliation: Defence Research Laboratory (DRDO), Tezpur, India. das_drlt@rediffmail.com.
authors.forename: Bodhaditya
authors.initials: B
authors.lastname: Das
authors.forename: Rashmi Rekha
authors.initials: RR
authors.lastname: Devi
authors.forename: Iohborlang M
authors.initials: IM
authors.lastname: Umlong
authors.forename: Kusum
authors.initials: K
authors.lastname: Borah
authors.forename: Saumen
authors.initials: S
authors.lastname: Banerjee
authors.forename: Anup Kr
authors.initials: AK
authors.lastname: Talukdar