Original scientific paper
Published in: Holistic Approach Environ. 3(2013) 2, pp. 60 – 79
Paper reference number: HAE-42
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STUDY OF CHROMIUM (VI) ADSORPTION USING PTEROSPERMUM- ACERIFOLIUM FRUIT CAPSULE ACTIVATED CARBON (FCAC) AND COMMERCIAL ACTIVATED CHARCOAL (CAC) AS A SELECTIVE ADSORBENTS
Navin Chandra Kothiyal*, Sumit Sharma*
* Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, India
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ABSTRACT
In the present study, fruit capsule activated carbon (FCAC) of P-acerifolium and commercial grade activated charcoal (CAC) were used for the study of adsorption of chromium (VI) from aqueous solution. The maximum adsorption took place in the pH range of 3 – 6 with in contact time of 180 minutes. The adsorption kinetic of chromium (VI) analyzed by pseudo first-order and pseudo second-order kinetics models. The kinetics of chromium (VI) uptake was best described by pseudo-second order rate model (regression coefficients, R2 > 0.99) with equilibrium rate constant values of 2.70 and 1.42 g/mg.min. for FCAC and CAC adsorbents. Intraparticle diffusion studies showed that the intraparticle transport is not only the rate-limiting step for the mechanism of chromium (VI) adsorption. The experimental results presented indicated that the adsorption data fitted better with the Langmuir isotherm equation with regression coefficient R2 > 0.99 for both the adsorbents. The maximum monolayer adsorption capacity of FCAC and CAC found to be 76.92 and 71.42 mg/g at initial pH 3.0. Thermodynamic parameters showed that adsorption process was spontaneous and endothermic. A comparative study of FCAC with commercial activated charcoal (CAC) showed that the adsorption capacity of indigenously prepared FCAC adsorbent was much better.
Keywords: P-acerfolium, chromium (VI), FT-IR, SEM-EDX, adsorption isotherm
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