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Title: Phosphorylated tamarind nut carbon for the removal of cadmium ions from aqueous solutions
Authors: Suganthi, N
Srinivasan, K
Keywords: Activated carbon;Phosphorylated tamarind nut carbon;Carbon granules
Issue Date: Oct-2010
Publisher: NISCAIR-CSIR, India
Abstract: Activated carbon prepared from phosphoric acid treatment of Tamarind nuts (seeds) is investigated for the removal of cadmium ions from aqueous solutions. Carbon granules of 300 to 800 µm particle size are chosen for all studies. The characteristics of the phosphorylated tamarind nut carbon (PTNC) are evaluated for porosity, surface area, iodine number, phenol number, moisture content and decolorizing power. PTNC is subjected to the adsorption of cadmium ions from aqueous solution. The effects of pH, contact time, metal ion concentration and carbon dosage are studied to evaluate the potential applicability of carbon produced as an adsorbent for wastewater treatment. The adsorption data are modeled by using Langmuir and Freundlich classical adsorptions isotherms. Kinetic studies fitted best with pseudo-second order model. Desorption studies indicated that ion-exchange mechanism is operating. Column studies are conducted in 2.5 cm diameter columns. Under optimum conditions of flow rate and bed height, breakthrough capacities are found out. The mechanism of adsorption for cadmium on PTNC is found to follow ion exchange process predominantly and supported by FTIR. The cadmium removal and the surface modification are also confirmed by SEM studies.
Page(s): 382-388
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.17(5) [October 2010]

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