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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.18 [2011] >
IJCT Vol.18(5) [September 2011] >
| Title: | Hexavalent chromium removal by gingelly oil cake carbon activated with zinc chloride |
| Authors: | Nagashanmugam, K B
Srinivasan, K |
| Keywords: | Adsorption isotherms
Commercial activated carbon
Chrome plating wastewater
Chromium(VI)
Kinetics
Zinc chloride
Gingelly oil cake carbon |
| Issue Date: | Sep-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | An activated carbon has been prepared from
gingelly oil cake (GOC) by zinc chloride treatment and its Cr(VI) removal
capacity is compared with that of commercial activated carbon (CAC). The effect
of experimental parameters such as pH, initial concentration, contact
time and adsorbents dose for Cr(VI) removal has been studied. Langmuir,
Freundlich and Temkin models are tested to describe the equilibrium isotherms.
The maximum adsorption capacity of the adsorbents calculated from Langmuir
isotherm is found to be 62.5 mg/g and 25.13 mg/g for zinc chloride treated
gingelly oil cake carbon (ZTGOC) and CAC respectively. R2 values
show that both Langmuir and Freundlich models fit well to explain the
adsorption phenomenon for ZTGOC and CAC. The kinetic data fits best to pseudo-second
order model. FT-IR analysis has been used to obtain information on the nature
of possible interaction between carbon adsorbents and metal ions. SEM images
confirm the adsorption of Cr(VI) onto these adsorbents through morphological
observations. Thermodynamic study shows the feasibility of process and
spontaneous nature of the adsorption. The carbon adsorbents have also been tested
for the removal of Cr(VI) from chrome plating wastewater and are found to remove Cr(VI) effectively. |
| Page(s): | 391-402 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.18(5) [September 2011]
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