Phosphate adsorption on hydrous ferric oxide (HFO) at different salinities and pHs.
Adsorption
FTIR
Hydrous ferric oxides (HFO)
Langmuir-freundlich model
Phosphate
Visual MINTEQ
Journal
Chemosphere
ISSN: 1879-1298
Titre abrégé: Chemosphere
Pays: England
ID NLM: 0320657
Informations de publication
Date de publication:
Jun 2019
Jun 2019
Historique:
received:
01
10
2018
revised:
07
03
2019
accepted:
11
03
2019
pubmed:
19
3
2019
medline:
11
7
2019
entrez:
19
3
2019
Statut:
ppublish
Résumé
Phosphate adsorption on suspended sediments is largely influenced by the variations in salinity and pH such as is the case in estuaries where freshwater mixes with seawater, exhibiting strong physico-chemical gradients. In this research, the influence of salinity and pH on the adsorption of phosphate on hydrous ferric oxides (HFO) was investigated in NaCl solutions. The adsorption isotherm data at different salinities can be well fitted with the Langmuir-Freundlich model. At pH 8.5 the maximum adsorption capacity increases with increasing salinity, from 22.7 mg PO4/g at salinity 0-78.5 mg PO4/g at salinity 35 PSU (Practical Salinity Unit) with the largest increase occurring in the low salinity range (76.8 mg PO4/g at salinity 5 PSU). Phosphate adsorption is also highly pH dependent and the adsorption capacity decreases with increasing pH. The dependence of phosphate adsorption on salinity could be attributed to the inner-sphere complexation. The presence of Na
Identifiants
pubmed: 30884296
pii: S0045-6535(19)30505-3
doi: 10.1016/j.chemosphere.2019.03.068
pii:
doi:
Substances chimiques
Ferric Compounds
0
Phosphates
0
Solutions
0
ferric oxide
1K09F3G675
ferric hydroxide
2UA751211N
Sodium Chloride
451W47IQ8X
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
352-359Informations de copyright
Copyright © 2019 Elsevier Ltd. All rights reserved.