Adsorption of Sulfur Dioxide by CoFe2O4 Spinel Ferrite Nanoparticles and Corresponding Changes in Magnetism

作者：Glover T Grant^*; Sabo Daniel; Vaughan Lisa A; Rossin Joseph A; Zhang Z John

来源：Langmuir, 2012, 28(13): 5695-5702.

DOI：10.1021/la3003417

Adsorption of sulfur dioxide on 10 nm CoFe2O4 spinel ferrite nanoparticles was examined. Adsorption loadings of sulfur dioxide at breakthrough conditions were determined to be approximately 0.62 mol/kg, which is significant given the 150 m(2)/g surface area of the nanoparticles. Adsorption proceeds through a chemisorption mechanism with sulfur dioxide forming a sulfate upon adsorption on the particle surface, which leads to a 23% decrease in the remnant magnetization, a 20% decrease in the saturation magnetization, and a 9% decrease in the coercivity of the magnetic nanoparticles. Adsorbent materials that provide a magnetic signal when adsorption occurs could have broad implications on adsorption-based separations.

• 出版日期2012-4-3