Journal
BIORESOURCE TECHNOLOGY
Volume 98, Issue 18, Pages 3617-3621Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2006.11.060
Keywords
rice husk; paraquat; methacrylic acid; graft copolymerization; adsorption
Ask authors/readers for more resources
This work investigates the adsorption of paraquat from aqueous medium using a methacrylic acid (MAA)-modified rice husk. The carboxyl groups were chemically bound to the surface of the rice husk by graft copolymerization using Fenton's reagent as a redox initiator. The graft copolymerization was examined to determine the H2O2 concentration and the amount of MAA monomer used. FT-IR spectra confirmed the presence of carbonyl groups on the structural units of the rice husk derivative. The MAA-modified rice husks were hydrolyzed to sodium salt and used to adsorb paraquat. The adsorption was rapid in the first few minutes and quickly reached equilibrium. Equilibrium adsorption data are more consistent with the Langmuir isotherm equation than with the Freundlich equation. The maximum adsorption capacity of modified rice husks was 317.7 mg/g-adsorbent. This value clearly exceeds the 60 mg/g of Fuller's earth and the 90 mg/g of activated carbon, which are the most commonly used binding agents for paraquat. (C) 2007 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available