1. Use of Manganic Ferrihydrite to treat As(V) contaminated water.
- Author
-
Mohanty, S.S., Baral, S.S., Mohapatra, D., and Roy Chaudhury, G.
- Subjects
- *
MANGANESE , *MANGANESE & the environment , *IRON , *IRON & the environment , *WATER waste , *WATER quality , *WATER analysis , *ADSORPTION (Chemistry) , *SURFACE chemistry - Abstract
The As(V) removal efficiency of Manganic Ferrihydrite, having a different mole ratio to Fe-Mn, were evaluated. The As(V) removal efficiency of the adsorbent increased with the increase in Mn up to 40-60 mole% in the Ferrihydrite. Thereafter, further increase in the Mn concentration showed an opposite trend. The adsorption efficiency was constant at pH range of 6-7 whereas the efficiency slightly decreased at > pH 7. Adsorption studies were also carried out varying the adsorbent and the adsorbate concentrations, respectively. The adsorption process followed both Freundlich's and Langmuir's adsorption isotherm models. The maximum theoretical uptake was calculated using the two investigated models. Since adsorption efficiency showed better results when the Mn concentration was 40-60 mole%, Manganic Ferrihydrite compound (Fe:Mn ratio 1:1) was used to conclude the experiments. The adsorption kinetics followed dual rates, faster at the beginning and then slower. The adsorption kinetics followed 1st order kinetics. The IR and TGA analyses displayed that the compound was Manganic Ferrihydrite. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF