Journal
ENVIRONMENTAL ENGINEERING SCIENCE
Volume 26, Issue 11, Pages 1673-1683Publisher
MARY ANN LIEBERT, INC
DOI: 10.1089/ees.2009.0170
Keywords
arsenic; perchlorate; ion exchange fiber; metal oxide nanoparticles; hybrid on exchange; regeneration; sustainability
Categories
Funding
- National Science Foundation [IIP-0650163]
- Commonwealth of Pennsylvania, Department of Community and Economic Development
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [0650163] Funding Source: National Science Foundation
Ask authors/readers for more resources
When multiple trace contaminants of significantly different chemical properties are present in a single source of contaminated water, designing an engineered sorbent for their simultaneous removal poses a major challenge. Physical-chemical properties of the sorption sites need to be tailored and expanded for preferential binding of more than one contaminant in such cases. The scientific challenge becomes increasingly complex when the sorbent requires to be reusable through intermittent regenerations. In this study, hydrated Fe(III) oxide or HFO nanoparticles were dispersed within an ion exchange fiber containing covalently attached quaternary ammonium functional groups. The resulting hybrid anion exchange fiber (HAIX-F) showed very high sorption affinity for both perchlorate and arsenate in the presence of orders of magnitude greater concentrations of competing sulfate and chloride anions. A series of experimental studies validated that relatively hydrophobic perchlorate was selectively bound to quaternary ammonium functional groups while arsenate uptake took place onto HFO surfaces through ligand exchange. The most significant finding of the study was that perchlorate and arsenate could be desorbed efficiently but separately from each other in a simple-to-operate two-step regeneration using conventional regenerants, namely, sodium hydroxide and sodium chloride solutions. In contrast, spherical anion exchange resins are not amenable to such high regeneration efficiency for perchlorate due to significantly longer diffusion path lengths. The unique sorption and desorption behaviors of HAIX-F can be easily extended to other applications where hydrophobic or polyvalent anions [e. g., pentachlorophenate, uranium(VI) oxyanion, benzenesulfonate] are simultaneously present with environmentally significant ligands, such as phosphate, oxalate, vanadate.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available