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Reactive porous composites for chromium(VI) reduction applications based on Fe/carbon obtained from post-consumer PET and iron oxide

机译:基于消费后PET和氧化铁获得的铁/碳的用于铬(VI)还原应用的反应性多孔复合材料

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摘要

By using post-consumer PET waste and iron oxide (Fe2O3), novel porous magnetic Fe/carbon composites for environmental applications have been obtained by a very simple process. XRD, Mossbauer, TG/MS, SEM, BET and Raman analyses have indicated that molten PET containing dispersed Fe2O3 particles decomposes in the 500-1000 degrees C range to produce a carbon matrix with developed micro and mesoporosities and surface areas of 136-260 m(2) g(-1), with simultaneous reduction of Fe3+ to iron phases whose composition depended on the decomposition temperature: (i) reactive Fe2+ phases, FeOOH, Fe3O4 (magnetite) and FeO (wustite) for the composites obtained at 500-600 degrees C and (ii) Fe-0 and Fe3C for those obtained at higher temperatures. Investigation of these composites for the reduction of aqueous chromium(VI) showed high activities for the materials obtained at 500 and 600 degrees C, which is discussed in terms of the phase composition and presence of carbon surface oxygen groups for the adsorption of Cr3+.
机译:通过使用消费后的PET废料和氧化铁(Fe2O3),已经通过非常简单的方法获得了用于环境应用的新型多孔磁性铁/碳复合材料。 XRD,Mossbauer,TG / MS,SEM,BET和拉曼分析表明,含有分散的Fe2O3颗粒的熔融PET在500-1000摄氏度范围内分解,生成具有发达的微孔和中孔且表面积为136-260 m的碳基质。 (2)g(-1),同时将Fe3 +还原为铁相,其组成取决于分解温度:(i)500-500℃下获得的复合材料的反应性Fe2 +相,FeOOH,Fe3O4(磁铁矿)和FeO(铁矾石)。 600摄氏度,以及(ii)在较高温度下获得的Fe-0和Fe3C。对这些复合材料进行还原以还原含水铬(VI)的研究表明,对于在500和600摄氏度下获得的材料具有很高的活性,这在相组成和用于吸附Cr3 +的碳表面氧基团的存在方面进行了讨论。

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