Kinetic Modeling of Adsorption of Malachite Green Using a Low-Cost Activated Carbon Obtained From Caesalpinia Pulchemma
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Date
2011
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Abstract
Malachite green is traditionally used for dyeing cotton, jute, silk, wool leather, etc. Despite
its industrial importance, malachite green poses several risks to the consumers. Therefore,
ef fect ive removal of malachi te green f rom was tewater is necessary. The present s tudy
involves kinetic modeling of the process of adsorption of malachite green from aqueous
solution onto a low cost carbon adsorbent prepared f rom Ceasalpinia. Wi th increase in
contact time of adsorption f rom 10 to 180 min, the % adsorption was found to increase
from ~ 8% to 29% wi th 100 mg/L at pH 2.87 with 300 mg of the adsorbent. The adsorption
kinetics of malachite green onto the low-cost adsorbent used in this study fol lowed first
er Lagergren rate equation. The intraparticle diffusion study shows that the rate con-
__.Its for intraparticle diffusion (K^) increased with the increase in initial concentration of
malachite green solution. Intraparticle diffusion is not the sole rate limiting factor for the
adsorption of malachite green.