170-1 Arsenate Adsorption From Aqueous Solutions On Magnetite Nanoparticles.

Poster Number 2413

See more from this Division: S11 Soils & Environmental Quality
See more from this Session: S11 General Soils & Environmental Quality: Metal/Metalloid Interactions in Soil
Monday, October 22, 2012
Duke Energy Convention Center, Exhibit Hall AB, Level 1
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Cheng-Hua Liu1, Ya-Hui Chuang2, Wei Zhang1 and Ming Wang3, (1)Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI
(2)Tea Research and Extension Station, Council of Agriculture, Executive Yuan, Taoyuan County, Taiwan
(3)Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan
Arsenic is highly toxic to humans and other living organisms, and is ubiquitous in natural environment from both natural and anthropogenic sources. Arsenate is a predominant inorganic anion of arsenic in natural surface water. Therefore, effective removal of arsenate from water is important to reducing arsenic environmental exposure. Magnetite (Fe3O4) nanoparticles have the great potential to be used as novel adsorbent for arsenate removal because of its large surface area and easy magnetic separation. In this study, the adsorption of arsenate on Fe3O4 nanoparticles from aqueous solutions was investigated to better understand mechanisms and influencing factors of arsenate adsorption using batch adsorption experiments, aided with spectroscopic analyses. The adsorption kinetics, isotherms, and influence of solution pH, ionic strength, and temperature were examined in detail. In addition, the Fe3O4 nanoparticles were characterized by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) analyses before and after the arsenate adsorption. The adsorption experiment results showed that Fe3O4 nanoparticles had high arsenate adsorption capacity, indicating its excellent potential as a highly effective adsorbent for arsenate removal in water treatment. The results of XPS and XAS suggested that arsenate formed inner-sphere surface complexes on the metal-oxide surface of Fe3O4 nanoparticles, which implied that the major arsenate adsorption mechanism on Fe3O4 nanoparticles was surface complexation.
See more from this Division: S11 Soils & Environmental Quality
See more from this Session: S11 General Soils & Environmental Quality: Metal/Metalloid Interactions in Soil
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