The reaction of amorphous iron sulfide with Mo(VI) under different pH conditions

Chemosphere
J J LianPing'an Peng

Abstract

Iron sulfide (FeS) is an important scavenger for hexavalent molybdate (Mo(VI)) in an anoxic environment; it plays a crucial role in the mobilization and transformation of Mo(VI), although the underlying reaction mechanisms between Mo(VI) and FeS remain unclear. This study investigates the Mo(VI) reaction kinetics with the amorphous FeS over a pH range 5.0-9.0 and Mo's chemical form on the FeS surface. It is found that the Mo(VI) reaction kinetics with FeS follow a pseudo first-order model, and the reaction rate constant (kobs) increases with a decrease in the pH value. The kobs at pH 5.0 is 0.027 min-1, which is about 38 times higher than that at pH 9.0. The rapid Mo(VI) removal under acidic conditions is due to quick Mo(VI) transformation into stable MoS2 and thiomolybdate (MoVOxSy). The amount of MoS2 formed on the surface of FeS increases with a decrease in the pH value. Under neutral and alkaline conditions, Mo(VI) is not transformed into MoS2 by FeS because the precipitation of iron oxy-hydroxide passivates the active sites of FeS. The study also investigates the effect of the initial dosage of FeS (20-200 mg L-1) and Mo(VI) (10-50 mg L-1) on the reaction kinetics of Mo(VI) with FeS. The results provides important informat...Continue Reading

References

Feb 5, 2003·Environmental Science & Technology·Benjamin C BostickGeorge R Helz
Sep 24, 2004·Environmental Science & Technology·George R HelzMani D Kahn
Jul 12, 2005·Bioresource Technology·C Namasivayam, D Sangeetha
Oct 21, 2006·Environmental Science & Technology·Yueqiang Liu, Gregory V Lowry
Jan 31, 2007·Chemical Reviews·David Rickard, George W Luther
Jul 11, 2008·Journal of Hazardous Materials·Yongjie XueShujing Zhu
Nov 4, 2008·Journal of Contaminant Hydrology·Andreas C ScheinostLaurent Charlet
Jan 18, 2011·Journal of Environmental Sciences (China)·Jun DongRui Zhou
Aug 7, 2012·Journal of Colloid and Interface Science·Zhen ZhangXinhua Xu
Feb 3, 2016·Chemosphere·Yao-Jen TuChien-Kuei Chang
Jun 6, 2016·Water Research·Dan LiYin Zhong
Mar 13, 2019·Environmental Science & Technology·Marco MangayayamDominique J Tobler

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