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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.17 [2010] >
IJEMS Vol.17(5) [October 2010] >
| 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.17(5) [October 2010]
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