Effect of pH on Aqueous Se(IV) Reduction by Pyrite

Mingliang Kang, Fanrong Chen, Shijun Wu, Yongqiang Yang, Christophe Bruggeman, L. Charlet

Research outputpeer-review


Interaction of aqueous Se(IV) with pyrite was investigated using persistently stirred batch reactors under O2-free conditions at pH ranging from 4.5 to 6.6. Thermodynamic calculations, an increase in pH during the experiments, and spectroscopic observation indicate that the reaction of aqueous Se(IV) by pyrite results in the formation of Se(0) and the release of Fe(II). The aqueous Se(IV) reduction rate follows a pseudofirst order. A ferrous iron mediated electron transfer mechanism is proposed to operate during the reduction of aqueous Se(IV) by pyrite. pH and iron concentration affect significantly on Se(IV) reaction rate and reaction product.
Original languageEnglish
Pages (from-to)2704-2710
JournalEnvironmental Science & Technology
Issue number7
StatePublished - Apr 2011

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