TY - JOUR
T1 - Posidonia oceanica (L.) fibers as a potential low-cost adsorbent for the removal and recovery of orthophosphate
AU - Wahab, Mohamed Ali
AU - Hassine, Rafik Ben
AU - Jellali, Salah
N1 - Funding Information:
Financial support of this work by the Tunisian Ministry of Higher Education, Scientific Research and Technology for financial support is gratefully acknowledged.
PY - 2011/7/15
Y1 - 2011/7/15
N2 - Adsorption efficiency of orthophosphate from aqueous solution onto Posidonia oceanica fibers (POF) as a raw, natural and abundant material was investigated and compared with other common natural materials. A series of batch tests were undertaken to assess the effect of the system variables, i.e. initial aqueous orthophosphate concentration, contact time, adsorbent dosage, pH and temperature. Results indicate that orthophosphate uptake increased with increasing initial orthophosphate concentration, temperature and adsorbent dosage and decreased with increasing pH values. The maximum adsorption capacity (Qm) determined from the Langmuir isotherm was calculated to be 7.45mgg-1 for the studied orthophosphates concentration range of 15-100mgL-1, pH 7; adsorbent dosage of 2gL-1 and temperature of 20±2°C. The adsorption data were very well described by the pseudo-second order model predicting a chemisorption process. The energy dispersive spectroscopy (EDS) and FTIR analysis before and after adsorption of orthophosphate onto POF showed that the main involved mechanisms are ligand exchange between orthophosphate and Cl-, SO42- and OH- and precipitation with calcium. In comparison with other natural adsorbents, raw POF could be considered as one of the most efficient natural materials for the removal of orthophosphate with the possibility of agronomic reuse.
AB - Adsorption efficiency of orthophosphate from aqueous solution onto Posidonia oceanica fibers (POF) as a raw, natural and abundant material was investigated and compared with other common natural materials. A series of batch tests were undertaken to assess the effect of the system variables, i.e. initial aqueous orthophosphate concentration, contact time, adsorbent dosage, pH and temperature. Results indicate that orthophosphate uptake increased with increasing initial orthophosphate concentration, temperature and adsorbent dosage and decreased with increasing pH values. The maximum adsorption capacity (Qm) determined from the Langmuir isotherm was calculated to be 7.45mgg-1 for the studied orthophosphates concentration range of 15-100mgL-1, pH 7; adsorbent dosage of 2gL-1 and temperature of 20±2°C. The adsorption data were very well described by the pseudo-second order model predicting a chemisorption process. The energy dispersive spectroscopy (EDS) and FTIR analysis before and after adsorption of orthophosphate onto POF showed that the main involved mechanisms are ligand exchange between orthophosphate and Cl-, SO42- and OH- and precipitation with calcium. In comparison with other natural adsorbents, raw POF could be considered as one of the most efficient natural materials for the removal of orthophosphate with the possibility of agronomic reuse.
KW - Adsorption mechanisms
KW - Modeling
KW - Orthophosphate
KW - POF
KW - Removal
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U2 - 10.1016/j.jhazmat.2011.04.085
DO - 10.1016/j.jhazmat.2011.04.085
M3 - Article
C2 - 21571429
AN - SCOPUS:79957751528
SN - 0304-3894
VL - 191
SP - 333
EP - 341
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -