Journal of Food, Agriculture and Environment

Adsorption removal of Pb(II) from aqueous solution by fulvic acid-coated ferrihydrite 

Author(s):

Shiyong Wei ¹, Wenjun Xiang ²

Recieved Date: 2013-02-08, Accepted Date: 2013-04-26

Abstract:

Fulvic acid (FA) coated ferrihydrite (FA-ferrihydrite) were prepared by a coprecipitation procedure for the removal of toxic Pb(II) from water. TOC and XRD analysis showed FA-ferrihydrite contained about 14.7% (w/w) of FA which coated a part of the ferrihydrite surfaces. Compared to ferrihydrite, the total pore volume, BET surface area and surface fractal dimension of FA-ferrihydrite increased. As for ferrihydrite and FA- ferrihydrite, the pH of the point of zero charge (pHpzc) was 7.8 and 5.4, and the surface charge at pH 6.0 was 0.41 and -0.43 mmol/g, respectively. The maximum adsorption capacity (q_max) for Pb(II) by FA-ferrihydrite (19.26 mg/g) was significantly higher than that by ferrihydrite (11.84 mg/g). The correlation coefficients (R²) of fitting Langmuir and Freundlich models ^{21, 22} to the adsorption data for Pb(II) by ferrihydrite were 0.993 and 0.953, and by FA-ferrihydrite were 0.981 and 0.987, respectively. This indicates that FA-ferrihydrite is a relatively high efficient adsorbent for Pb(II), and the adsorption behavior can be well described by Freundlich model ²². 

Keywords:

Fulvic acid-coated ferrihydrite, surface properties, adsorption, Pb(II)

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Environment
Pages: 1376-1380

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