Comparative mechanisms of Cr(VI) adsorption on biosynthetically derived Iron-minerals

Abstract

In this study, Schwertmannite, Akaganéite and Ammoniojarosite were biosynthesized by different bacteria and characterized. Our results showed that bacteria are critical in mediating the mineral formation process: the morphology, crystallinity, grain size and specific surface area of each mineral varied upon different bacteria and culturing conditions. In addition, the formed minerals’ elemental composition and group disparity lead to different morphology, crystallinity and subsequent adsorption performance. In particular, adsorption difference existed in iron minerals biosynthesized by different bacteria. The maximal adsorption capacity of Akaganéite, Schwertmannite and Ammoniojarosite were 26.6 mg/g, 17.5 mg/g and 3.90 mg/g respectively. Our results also suggest that Cr(VI) adsorption on iron-minerals involves hydrogen bonding, electrostatic interaction, and ligand exchange. The adsorption only occurred on the surface of Ammoniojarosite, while for Akaganéite and Schwertmannite, the tunnel structure greatly facilitated the adsorption process and improved adsorption capacity. Thus, we conclude that the molecular structure is the primary determining factor for adsorption performance. Collectively, our results can provide useful information in selecting suitable bacteria for synthesizing heavy-metal scavenging minerals according to different environmental conditions.h

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