Removal of 3-chlorophenol from water using rice-straw-based carbon
Journal
Journal of Hazardous Materials
Journal Volume
147
Journal Volume
147
Journal Issue
1-2
Journal Issue
1-2
Pages
313-318
Start Page
313
End Page
318
ISSN
03043894
Date Issued
2007-08-17
Author(s)
Abstract
The removal of 3-chlorophenol (CP) from water by carbon derived from burning of rice straw was evaluated in this study. Rice straw was burned at 300 °C in the air to obtain rice carbon (RC). Scanning electron micrographs showed a highly porous structure of RC. NMR and FTIR spectroscopy suggested an enhanced aromaticity of RC and the presence of oxygen-containing functional groups. Adsorption of CP by RC was characterized by L-shaped nonlinear isotherms, suggesting surface adsorption rather than partitioning. The adsorption occurred most strongly when CP existed as a neutral species. The adsorption decreased with increasing pH due to increased deprotonation of surface functional groups of RC and dissociation of CP. The adsorption capacity determined by data-fitting to the Langmuir model was 14.2, 12.9, 11.4 and 4.9 mg g-1 at pH 4, 6, 8 and 10, respectively. These results suggest that rice-straw-based carbon may be effectively used as a low-cost substitute for activated carbon for removal of chlorophenols from water.
Subjects
Activated carbon
Adsorption
Chlorophenol
Rice straw
Water treatment
Type
journal article