Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, MG, Brazil.
Chemosphere. 2010 Sep;81(1):7-12. doi: 10.1016/j.chemosphere.2010.07.056. Epub 2010 Aug 17.
Composites based on iron supported on high surface area activated carbon were prepared and characterized with (57)Fe Mössbauer spectroscopy, X-ray diffraction, saturation magnetization measurements and temperature-programmed reduction. Upon thermal treatment, the supported iron oxides react with carbon to yield reduced chemical species, i.e. Fe(3)O(4) and Fe(0). This so produced composite was found to be highly efficient in two environmental applications: (i) degradation of textile dye and (ii) reduction of Cr(VI) in aqueous medium. Sequential reuses evidenced a progressive chemical deactivation of the composites due to a corresponding oxidation of the reactive species. Even after being virtually deactivated, the initial chemical reducing ability of the composites can be regenerated by heating at 800 degrees C under N(2) atmosphere, and then reused for several consecutive times.
基于高比表面积活性炭负载铁的复合材料通过（57）Fe Mössbauer 光谱、X 射线衍射、饱和磁化强度测量和程序升温还原进行了制备和表征。在热处理过程中，负载的氧化铁与碳反应生成还原的化学物质，即 Fe(3)O(4)和 Fe(0)。该复合材料在两个环境应用中表现出高效：（i） 纺织染料的降解和（ii） 水溶液中 Cr(VI)的还原。连续重复使用证明了由于反应性物质的相应氧化，复合材料的化学失活逐渐发生。即使几乎失活，复合材料的初始化学还原能力也可以通过在 N(2)气氛下在 800 摄氏度加热再生，并随后重复使用几次。
