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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.


Validation of Weber-Morris equation for arsenic sorption onIACAA.
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Figure 11: Validation of Weber-Morris equation for arsenic sorption onIACAA.

Mentions: The plot of qt versus t1/2 from equation (11) is shown in Figure 11. All the plots have the same general features of initial curvedportion followed by linear portion and a plateau. The initial portion isattributed to the bulk diffusion and subsequent linear portion is attributed tothe intraparticle diffusion. The fitness of particle diffusion model givesfurther evidence that the arsenic removal is a surface process under the studiedexperimental conditions.


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)

Validation of Weber-Morris equation for arsenic sorption onIACAA.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 11: Validation of Weber-Morris equation for arsenic sorption onIACAA.
Mentions: The plot of qt versus t1/2 from equation (11) is shown in Figure 11. All the plots have the same general features of initial curvedportion followed by linear portion and a plateau. The initial portion isattributed to the bulk diffusion and subsequent linear portion is attributed tothe intraparticle diffusion. The fitness of particle diffusion model givesfurther evidence that the arsenic removal is a surface process under the studiedexperimental conditions.

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.