Reduction of Nitrobenzene by Four Sulfide Minerals: Kinetics, Products, and Solubility
- Y. Shane Yu and
- George W. Bailey
Nitrobenzene was used as a molecular probe to study electron donor properties of four sulfide minerals. Nitrobenzene was selected as a probe because its reaction in aqueous systems has been well characterized. Suspensions of the four minerals were reacted with nitrobenzene under anaerobic conditions for various time periods. Nitrobenzene and its reaction products in both the solution and the solid phase were analyzed by liquid chromatography and UV-visible spectroscopy. The observed half-lives of nitrobenzene are 7.5, 40, 105, and 360 h, respectively, for reaction with sodium sulfide (Na2S), alabandite (MnS), sphalerite (ZnS), and molybdenite (MoS2) under anaerobic conditions, at a 0.24 mol L−1 water-mineral mixture concentration. The log plot of calculated sulfide ion concentration of minerals vs. reaction halflife shows a linear relationship. Nitrobenzene reduction by sulfide minerals is a solution phenomena. The sulfide mineral dissolution rate and its solubility, however, influence the reduction rate.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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