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Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.19 [2012] >
IJCT Vol.19(2) [March 2012] >
| Title: | Adsorption of Cr(VI) from aqueous solutions on tea waste and coconut husk |
| Authors: | Dave, Pragnesh N
Pandey, Nishtha
Thomas, Hannah |
| Keywords: | Adsorption Model
Chromium (VI)
Coconut Husk
Kinetic
Lagergren Equation
Tea Waste |
| Issue Date: | Mar-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Adsorption of Cr (VI) from
aqueous solutions on tea wastes and coconut husk has been studied. The effect
of experimental parameters like contact time, adsorbent dosage, initial metal
ions concentration and pH has been
investigated. The percentage removal of chromium ions increases with the increase
in contact time and dosage of adsorbent. Adsorption of Cr (VI) shows maximum adsorption capacity of
34.25 mg/g and 21.59 mg/g with tea waste and coconut husk respectively at pH 2. The removal of Cr (VI) increases with the increase in
adsorbent dosage, the optimum dosage being 8 mg/L.
The percentage removal of Cr in tea waste and coconut husk is found to be 86%
and 82% respectively. Adsorption data
have been modelled with the Freundlich and Langmuir adsorption isotherms and
various first order kinetic equations.
These isotherms are found to be applicable. The various kinetic models used are
Natarajan-Khalaf equation, Lagergren equation, Bhattacharya and Venkobachar
equation, and the Intra-particle diffusion model. An excellent fit is obtained
by the Lagergren equation. Thus, adsorbents prepared from tea waste and coconut
husk could be used for the removal of Cr (VI) from aqueous solutions. |
| Page(s): | 111-117 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.19(2) [March 2012]
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