Journal article
Enhanced phosphate removal from aqueous solution by ferric-modified laterites: Equilibrium, kinetics and thermodynamic studies
Chemical Engineering Journal, Vol.228, pp.679-687
2013
Abstract
The phosphate removal performances of a series of ferric-modified laterites (ML) were tested and compared with raw laterite (RL) in this study. After the modification with 0.5M FeCl3 solution, the resulting adsorbent ML-C exhibited 90.12% of phosphate removal, which was 37.47% higher than that of RL under the same experimental condition. This may be attributed to the significant increase of BET surface area and total pore volume for ML-C, arising from the formation of akaganeite. The effects of contact time, initial phosphate concentration, temperature, pH, and co-existing ions on the adsorption capacity of ML-C were investigated in detail. The equilibrium data of ML-C were fitted better by the Freundlich model than the Langmuir model, suggesting the heterogeneity of the adsorbent surface. The maximum adsorption capacity was estimated to be 31.53mg P/g at 25°C, which decreased with increasing temperatures. The negative change in free energy (δG°) and in enthalpy (δH°) indicated that the adsorption was a spontaneous and exothermic process. The phosphate adsorption kinetics was better described by the pseudo-second-order model, which indicated the adsorption process was chemisorption. Phosphate removal capacities decreased with increasing pH. The presence of 0.001M and 0.01M completive ions, e.g. Cl-, NO3-, SO42-and HCO3-, had neglectable effects on the phosphate adsorption. In the reusability study, the adsorbent showed no significant loss in their adsorption performance after four adsorption-desorption cycles, indicating that ML-C was able to be utilized as a potential cost-effective phosphate adsorbent for practical applications.
Details
- Title
- Enhanced phosphate removal from aqueous solution by ferric-modified laterites: Equilibrium, kinetics and thermodynamic studies
- Authors/Creators
- W-Y Huang (Author/Creator)R-H Zhu (Author/Creator)F. He (Author/Creator)D. Li (Author/Creator)Y. Zhu (Author/Creator)Y-M Zhang (Author/Creator)
- Publication Details
- Chemical Engineering Journal, Vol.228, pp.679-687
- Publisher
- Elsevier
- Identifiers
- 991005540504607891
- Copyright
- © 2013 Elsevier B.V.
- Murdoch Affiliation
- School of Engineering and Information Technology
- Language
- English
- Resource Type
- Journal article
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- 2 Chemistry
- 2.90 Water Treatment
- 2.90.27 Adsorption
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- Engineering, Chemical
- Engineering, Environmental
- ESI research areas
- Engineering