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氧化铁矿物和亚铁广泛存在于厌氧环境中。亚铁-氧化铁共存的表面结合铁反应体系可由氧化铁矿物表面吸附部分亚铁离子形成。实验研究了磁铁矿、针铁矿和赤铁矿3种氧化铁矿物表面结合铁对硝基苯的反应活性及其动力学。在p H 7.5时,3种氧化铁矿物对Fe(Ⅱ)离子的吸附能力强弱顺序为针铁矿>磁铁矿>赤铁矿。氧化铁矿物对Fe(Ⅱ)的吸附能力是表面结合Fe(Ⅱ)体系还原硝基苯反应的前提条件,而吸附Fe(Ⅱ)形成的表面活性物质种类是体系还原硝基苯能力的关键因素。3种氧化铁矿物的还原能力依Fe2O3/Fe(Ⅱ)、α-Fe OOH/Fe(Ⅱ)、Fe3O4/Fe(Ⅱ)次序增强。氧化铁矿物/Fe(Ⅱ)体系对硝基苯的还原转化可用准一级动力学模拟。
Iron oxide minerals and ferrous are widely found in anaerobic environments. Ferrous - iron oxide surface coexistence of iron binding reaction system can be adsorbed on the surface of iron oxide minerals formed by ferrous ions. The reactivity and kinetics of iron-p-nitrobenzene on the surface of three iron oxide minerals from magnetite, goethite and hematite were studied experimentally. At p H 7.5, the order of adsorption of Fe (Ⅱ) ions on three iron oxide minerals is goethite> magnetite> hematite. The adsorption capacity of iron oxide to Fe (Ⅱ) is the prerequisite for the reduction of nitrobenzene by Fe (Ⅱ) in the surface. The adsorption of Fe (Ⅱ) on the surface of activated species is the key to the ability of the system to reduce nitrobenzene factor. The reducibility of the three kinds of iron oxide minerals is enhanced in the order of Fe2O3 / Fe (Ⅱ), α-FeOOH / Fe (Ⅱ) and Fe3O4 / Fe (Ⅱ). Quasi-first-order kinetic modeling of the reduction and conversion of nitrobenzene in iron oxide / Fe (Ⅱ) system.