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Anukthi C (1). Poojari.pdf
Int.J.Curr.Microbiol.App.Sci (2015)
  • Satish Bhalerao, Wilson College
The effective removal of Cr (VI) from aqueous solutions in a batch system using of
low-cost biosorbent rind of Orange (Citrus sinensis), (L.) Osbeck 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 Cr (VI) concentration, contact time
and temperature were studied. The optimum solution pH for Cr (VI) biosorption by
biosorbent was 2.0 with the optimal removal 71.01 %. The adsorbent dose 5 mg/ml
was enough for optimal removal of 73.91 %. 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. Sorption equilibrium exhibited better fit to Langmuir
isotherm (R = 0.9986) than Freundlich isotherm (R = 0.9153), Temkin isotherm (R
= 0.8903) and Dubinin-Kaganer-Redushkevich (DKR) isotherm (R = 0.7413). The
maximum adsorption capacity determined from Langmuir isotherm was found to
be 10.7411 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, pseudo-second-order, Elovich equation and Weber & Morris
intra-particle diffusion rate equation. Results clearly indicates that the pseudosecond-
order kinetic model was found to be correlate the experimental data
strongest than other three kinetic models. Thermodynamic study revealed that the
biosorption process was spontaneous, endothermic and increasing randomness of
the solid solution interfaces. The rind of Orange (Citrus sinensis), (L.) Osbeck used
successfully for removal of Cr (VI) from aqueous solutions, can be used very
promisingly for industrial wastewater treatment.
  • Effective removal,
  • Chromium (VI),
  • Rind of Orange (Citrus sinensis),
  • (L.) Osbeck FTIR,
  • SEM,
  • Adsorption isotherms,
  • Adsorption kinetics,
  • Thermodynamic study
Publication Date
Winter November 17, 2015
Citation Information
Satish Bhalerao. "Anukthi C (1). Poojari.pdf" Int.J.Curr.Microbiol.App.Sci Vol. 4 Iss. 4 (2015) p. 653 - 671 ISSN: ISSN: 2319-7706
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