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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 initial concentration on As (III) adsorption atpH = 7.4, adsorbentdose = 1 g/100 ml and contacttime = 90 min.
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Figure 4: Effect of initial concentration on As (III) adsorption atpH = 7.4, adsorbentdose = 1 g/100 ml and contacttime = 90 min.

Mentions: Effect of initial concentration on the percentage removal of As (III) was studiedby varying different initial arsenic concentration. The effect of initialconcentration on removal of As (III) was shown in Figure 4 which reveals that removal efficiency is higher with lower initialarsenic concentration (0.40 mg/L); a gradual decrease in As (III) uptake byIACAA was observed with increasing feed concentration of As (III). The reasonfor the decrease in As (III) adsorption efficiency at higher initialconcentration may be due to fact that the active sites ultimately becomessaturated with adsorbed arsenic and further addition of arsenic to the solutionwould not be expected to increase the amount to be adsorbed significantly [33].


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 initial concentration on As (III) adsorption atpH = 7.4, adsorbentdose = 1 g/100 ml and contacttime = 90 min.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Effect of initial concentration on As (III) adsorption atpH = 7.4, adsorbentdose = 1 g/100 ml and contacttime = 90 min.
Mentions: Effect of initial concentration on the percentage removal of As (III) was studiedby varying different initial arsenic concentration. The effect of initialconcentration on removal of As (III) was shown in Figure 4 which reveals that removal efficiency is higher with lower initialarsenic concentration (0.40 mg/L); a gradual decrease in As (III) uptake byIACAA was observed with increasing feed concentration of As (III). The reasonfor the decrease in As (III) adsorption efficiency at higher initialconcentration may be due to fact that the active sites ultimately becomessaturated with adsorbed arsenic and further addition of arsenic to the solutionwould not be expected to increase the amount to be adsorbed significantly [33].

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.