A new hybrid (polymer/inorganic) fibrous sorbent for arsenic removal from drinking water
Artykuł w czasopiśmie
| Status: | |
| Autorzy: | Vatutsina O., Soldatov Vladimir S., Sokolova V., Johann Jurgen, Bissen Monique, Weissenbacher A. |
| Rok wydania: | 2007 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 3 |
| Wolumen/Tom: | 67 |
| Strony: | 184 - 201 |
| Web of Science® Times Cited: | 141 |
| Scopus® Cytowania: | 158 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| It has been established that fibrous polymeric ion exchangers can be impregnated with nanoparticles of hydrated ferricoxide (HFO) which serves as a selective sorbent for As(III) and As(V) species from aqueous solutions. The screening stud-ies have shown that the largest amount of Fe(III) can be loaded into a weak base anion exchanger with ternary aminogroups (up to 1.4 mmol Fe/gram of dry fiber). The fibrous composite sorbent on the base of such anion exchanger possessa high selectivity toward both As(III) and As(V) species combined with a high sorption capacity (2.9 g As/kg till As con-centration in outlet solution becomes more than 10lg/L). The sorbent does not release Fe into contacting solution anddoes not require backwashing in column operations. Its specific feature is extremely high rate of the sorption processes.The process rate is controlled by diffusion of the arsenic species into HFO particles uniformly spread in the fiber. The halfprocess time appeared equal 23 s which allows column operation with empty bed contact time down to 10 s. The sorptionof As(III) at pH values admissible for drinking water is not affected by the foreign anionsðCl;SO24;H2PO4=HPO24Þ.Sorption of As(V) decreases with phosphates concentration increasing. Column experiments with model and naturalwaters containing As in concentrations 50–100 ppb have shown that the new sorbent can be used for production of smallwater household filters with the filtering bed volume about 0.5 L. The filter allow purification of 200 L of water per hourand obtaining 2.5–5 tons (5000–10000 bed volumes) of purified from As(III) and As(V) water without correcting pH andpre-oxidation of As(III). The field experiment on purification of natural water containing 60 ppb of As allowed purificationof 10000 bed volumes of water to 10 ppb of As in the effluent. |
