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Arsenite and Arsenate Adsorption on Ferrihydrite: Kinetics, Equilibrium, and Adsorption Envelopes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Raven, Klaus P. Jain, And Amita Loeppert, Richard H. |
| Copyright Year | 1998 |
| Abstract | Because of its toxicity, arsenic is of considerable environmental concern. Its solubility in natural systems is strongly influenced by adsorption at iron oxide surfaces. The objective of this study was to compare the adsorption behavior of arsenite and arsenate on ferrihydrite, under carefully controlled conditions, with regard to adsorption kinetics, adsorption isotherms, and the influence of pH on adsorption. The adsorption reactions were relatively fast, with the reactions almost completed within the first few hours. At relatively high As concentrations, arsenite reacted faster than arsenate with the ferrihydrite, i.e., equilibrium was achieved sooner, but arsenate adsorption was faster at low As concentrations and low pH. Adsorp tion maxima of approximately 0.60 (0.58) and 0.25 (0.16) molAs molFe-1 were achieved for arsenite and arsenate, respectively, at pH 4.6 (pH 9.2 in parentheses). The high arsenite retention, which precludes its retention entirely as surface adsorbed species, indicates the likel. |
| Starting Page | 344 |
| Ending Page | 349 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/es970421p |
| Volume Number | 32 |
| Alternate Webpage(s) | http://lib3.dss.go.th/fulltext/Journal/Environ%20Sci.%20Technology1998-2001/1998/no.3/3,1998%20vol.32,no3,p344-349.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
