title: Reduction of nitrite and nitrate on nano-dimensioned FeS.
abstract: The reaction of nitrite (NO2(-)) and nitrate (NO3(-)) on nanometer-sized FeS particles was investigated in alkaline (initial pH = 10.3) solutions at reaction temperatures of 22, 70, and 120 °C using in situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and fluorescence spectroscopy that allowed an analysis of adsorbate complexation on the FeS and reaction product in the aqueous phase, respectively. ATR-FTIR showed that NO was a surface-bound intermediate on FeS during its exposure to NO2(-) at all three reaction temperatures. Ammonia/ammonium (NH3/NH4(+)) product was also produced when FeS was exposed to NO2(-) at the 70 °C and 120 °C reaction temperatures. Activation of NO3(-) to form surface-bound NO was experimentally observed to occur at 120 °C on FeS, but not at the lower reaction temperatures. Furthermore, NH3/NH4(+) product in the aqueous phase was only present during the reaction of FeS with NO3(-) at the highest temperature used in this study.
authors: Department of Chemistry, Temple University, Philadelphia, PA, 19122, USA.
authors: Alexander D
authors: AD
authors: Gordon
authors: Alexander
authors: A
authors: Smirnov
authors: Samantha L
authors: SL
authors: Shumlas
authors: Soujanya
authors: S
authors: Singireddy
authors: Matthew
authors: M
authors: DeCesare
authors: Martin A A
authors: MA
authors: Schoonen
authors: Daniel R
authors: DR
authors: Strongin
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D019418:Evolution, Chemical; D005296:Ferrous Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D053758:Nanoparticles / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D009573:Nitrites / Q000737:chemistry*; D010084:Oxidation-Reduction; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D005296:Ferrous Compounds; D009566:Nitrates; D009573:Nitrites; D000641:Ammonia; C022597:ferrous sulfide
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