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Arsenic (III) adsorption on iron acetate coated activated alumina: thermodynamic, kinetics and equilibrium approach.

Das B, Devi RR, Umlong IM, Borah K, Banerjee S, Talukdar AK - J Environ Health Sci Eng (2013)

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Defence Research Laboratory (DRDO), Tezpur, India. das_drlt@rediffmail.com.

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.

No MeSH data available.


Effect of contact time on As (III) adsorption at As(III)concentration = 0.45 mg/L, adsorbentdose = 1 g/100 L and pH = 7.4.
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Figure 3: Effect of contact time on As (III) adsorption at As(III)concentration = 0.45 mg/L, adsorbentdose = 1 g/100 L and pH = 7.4.

Mentions: Figure 3 demonstrates the effect of contact time onthe adsorption of As (III) onto IACAA. From the figure it is clear thatadsorption efficiency increases with increasing contact time, reaching a maximumremoval at contact time of 90 minutes; thereafter removal becomes linearlyconstant. This may be due to the overlapping of active sites with arsenicspecies as the contact time increases and also due to decrease in the effectivesurface area resulting in the conglomeration of exchange particle [32].


Arsenic (III) adsorption on iron acetate coated activated alumina: thermodynamic, kinetics and equilibrium approach.

Das B, Devi RR, Umlong IM, Borah K, Banerjee S, Talukdar AK - J Environ Health Sci Eng (2013)

Effect of contact time on As (III) adsorption at As(III)concentration = 0.45 mg/L, adsorbentdose = 1 g/100 L and pH = 7.4.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109662&req=5

Figure 3: Effect of contact time on As (III) adsorption at As(III)concentration = 0.45 mg/L, adsorbentdose = 1 g/100 L and pH = 7.4.
Mentions: Figure 3 demonstrates the effect of contact time onthe adsorption of As (III) onto IACAA. From the figure it is clear thatadsorption efficiency increases with increasing contact time, reaching a maximumremoval at contact time of 90 minutes; thereafter removal becomes linearlyconstant. This may be due to the overlapping of active sites with arsenicspecies as the contact time increases and also due to decrease in the effectivesurface area resulting in the conglomeration of exchange particle [32].

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Defence Research Laboratory (DRDO), Tezpur, India. das_drlt@rediffmail.com.

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.

No MeSH data available.