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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 adsorbent dose on As (III) adsorption at As(III)concentration = 0.45 mg/L, pH = 7.4 andcontact time = 90 min.
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Figure 1: Effect of adsorbent dose on As (III) adsorption at As(III)concentration = 0.45 mg/L, pH = 7.4 andcontact time = 90 min.

Mentions: The effect of adsorbent dose on arsenic removal at fixed initial arsenicconcentration is shown in Figure 1. It was observedthat the adsorption efficiency increases rapidly with increase in adsorbent dosefrom 0.1 – 1 g/100 mL; a marginal increase is observed onfurther increase in the adsorbent dose. The removal efficiency was observed toincrease sharply up to 1 g/100 mL of As (III) solution thereafterremoval becomes almost constant. Thus, 1 g/100 mL was taken for otherstudies. The increase in the efficiency of removal may be attributed to the factthat with the increase in adsorbent dose, more adsorbent surface is availablefor the solute to be adsorbed [30].


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 adsorbent dose on As (III) adsorption at As(III)concentration = 0.45 mg/L, pH = 7.4 andcontact time = 90 min.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Effect of adsorbent dose on As (III) adsorption at As(III)concentration = 0.45 mg/L, pH = 7.4 andcontact time = 90 min.
Mentions: The effect of adsorbent dose on arsenic removal at fixed initial arsenicconcentration is shown in Figure 1. It was observedthat the adsorption efficiency increases rapidly with increase in adsorbent dosefrom 0.1 – 1 g/100 mL; a marginal increase is observed onfurther increase in the adsorbent dose. The removal efficiency was observed toincrease sharply up to 1 g/100 mL of As (III) solution thereafterremoval becomes almost constant. Thus, 1 g/100 mL was taken for otherstudies. The increase in the efficiency of removal may be attributed to the factthat with the increase in adsorbent dose, more adsorbent surface is availablefor the solute to be adsorbed [30].

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.