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Author(s): T. Khan & M. Chaudhuri
Abstract:
The objective of the study was to prepare activated carbon from coconut coir and
compare its adsorption behaviour for textile dye with that of a commercial
activated carbon.
The coconut coir activated carbon (CCAC) and commercial
activated carbon (CAC) were characterised in terms of ash content, bulk density,
pH, pHZPC, surface area, micropore area, micropore volume, average pore
diameter, surface morphology and surface functional groups.
Adsorption of a
textile dye, Acid Red 18 (AR 18), by CCAC and CAC was examined.
Batch
adsorption test showed that extent of dye adsorption was dependent on dye
concentration, contact time and pH.
Equilibrium adsorption was attained in 240
min and maximum adsorption occurred at pH 2.
Adsorption by CCAC and CAC
followed pseudo-second-order kinetics and equilibrium adsorption data were
described by the Freundlich and Langmuir isotherm models.
CCAC showed
higher adsorption capacity for the dye [25.7 (Freundlich) and 48.5 (Langmuir)]
compared to that [12.0 (Freundlich) and 37.3 (Langmuir)] of CAC.
CCAC is a
suitable substitute for CAC in the removal of acid dyes from aqueous solution
Keywords:
Acid Red 18, activated carbon, adsorption, coconut coir, Freundlich
isotherm, Langmuir isotherm.
...
Pages: 12
Size: 770 kb
Paper DOI: 10.2495/RAV110111
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