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  • Satish Bhalerao, Wilson College
The use of Tarminalia catappa L. leaves for effective removal of chromium (VI) from aqueous solutions in a batch system was
studied. The FTIR study of acid treated biosorbent showed that the possibility of availability of function groups such as hydroxyl,
carbonyl, carboxylic etc. The SEM represents a porous structure with large surface area. The effects of operational factors
including solution pH, biosorbent dose, initial chromium (VI) concentration, contact time and temperature were studied. The
optimum solution pH for chromium (VI) adsorption by biosorbent was 2.0 with the optimal removal 70.20 %. The biosorbent dose 5
mg/ml was enough for optimal removal of 69.23 %. The equilibrium was achieved after 150 minutes of contact. The equilibrium
data were well described by typical Langmuir, Freundlich, Dubinin-Kaganer-Redushkevich (DKR) and Temkin adsorption
isotherms. bioorption equilibrium exhibited better fit to Langmuir isotherm (R = 0.9972) than Freundlich isotherm (R = 0.9151),
Temkin isotherm (R = 0.8782) and Dubinin-Kaganer-Redushkevich (DKR) isotherm (R = 0.6773). The maximum adsorption
capacity determined from Langmuir isotherm was found to be 44.0528 mg per g of biosorbent. Furthermore, to determine the
adsorption mechanism, a detailed analysis has been conducted by testing kinetic models such as pseudo-first-order, pseudosecond-
order, Elovich equation and Weber & Morris intraparticule diffusion rate equation. Results clearly indicates that the
pseudo-second-order kinetic model was found to be correlate the experimental data strongest than other three kinetic models.
Thermodynamic study revealed that the adsorption process was spontaneous, endothermic and increasing randomness of the
solid solution interfaces. Tarminalia catappa L. leaves used successfully for removal of chromium (VI) from aqueous solutions can
have promising application in industrial wastewater treatment.
  • Effective removal,
  • Chromium (VI),
  • Tarminalia catappa L. leaves,
  • FTIR,
  • SEM,
  • Adsorption isotherms,
  • Adsorption kinetics,
  • Thermodynamic study.
Publication Date
Spring May 6, 2015
Citation Information
Satish Bhalerao. "ijcrcps8.pdf" INTERNATIONAL JOURNAL OF CURRENT RESEARCH IN CHEMISTRY AND PHARMACEUTICAL SCIENCES Vol. 2 Iss. 4 (2015) p. 48 - 62 ISSN: p-ISSN: 2348-5213: e-ISSN: 2348-5221
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