Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 93, Issue -, Pages 84-94Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.reactfunctpolym.2015.06.002
Keywords
Arsenic; Zirconium oxide; Nanoparticles; Adsorption; Hybrid ion exchange resins
Funding
- Groundwater Research Center (GWRC)
- Research Center for Environmental and Hazardous Substance Management (EHSM), Khon Kaen University, Thailand
- Thailand Research Fund [TRG5880160]
- National Collegiate Invention and Innovation Alliance (NCIIA)
- Pennsylvania Infrastructure and Technology Alliance (PITA)
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Natural groundwater contamination by arsenic puts over 100 million people at-risk throughout the world. If arsenic is the primary concem, the most ideal treatment solution would be a regenerable fixed-bed adsorbent: minimal energy requirement, simple operation and low cost. Such an adsorbent should have high arsenic capacity, high physical/chemical durability and high regenerability for several cycles of reuse. Hybrid anion exchange resins impregnated with hydrous zirconium oxide nanoparticles (HAIX-Zr) combine the physical durability and high anion diffusivity of anion exchanger resins with the high arsenic capacity and high chemical durability of zirconium oxides. HAIX-Zr was synthesized using non-hazardous and easy-to-transport pre-calcined zirconium oxide and was tested to be an effective As(V) and As(III) adsorbent over several cycles of exhaustion-regeneration in the presence of high concentrations of competing anions; at high concentrations, phosphate and silica show competition with arsenic. The high regenerability of HAIX-Zr (>90%) makes it more sustainable to regenerate and reuse the HAIX-Zr for numerous cycles to reduce the volume of arsenic-laden waste. Unlike other iron- or aluminum-based adsorbents, HAIX-Zr is chemically stable at landfill conditions where it could be safely disposed without leaching arsenic. (C) 2015 Elsevier B.V. All rights reserved.
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