Instituto Tecnológico de Toluca, Departamento de posgrado, Ex-rancho la virgen S/N, C.P. 50120 Metepec, Mexico.
J Environ Manage. 2013 Jan 15;114:1-7. doi: 10.1016/j.jenvman.2012.09.027. Epub 2012 Nov 28.
This manuscript presents the synthesis of carbon modified with iron nanoparticles (CFe) and iron carbide (CarFe) from the pyrolyzed crown leaves of pineapple (Ananas comosus) treated with iron salts. The materials that were obtained were used for the removal of As(V) from aqueous media. The carbonaceous materials were characterized by Scanning Electron Microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS) and Mossbauer Spectroscopy. The specific area (BET), number site density and point of zero charge (pH(pzc)) were also determined. The kinetic parameters were obtained by fitting the experimental data to the pseudo-first-order and pseudo-second-order models. Different isotherm models were applied to describe the As(V) adsorption behavior. The kinetics of As(V) sorption by CFe and CarFe was well defined for the pseudo-second-order model (R(2) = 0.9994 and 0.999, respectively). The maximum As(V) uptake was 1.8 mg g(-1) for CFe and 1.4 mg g(-1) for CarFe. The results obtained indicated that both materials are equally useful for As(V) sorption. The As(V) experimental isotherm data were described by the Freundlich model for CFe and CarFe.
本文介绍了从用铁盐处理过的菠萝（Ananas comosus）冠叶热解得到的铁纳米粒子（CFe）和碳化铁（CarFe）修饰的碳的合成。所得到的材料用于从水介质中去除 As(V)。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）、X 射线光电子能谱（XPS）和穆斯堡尔光谱对碳质材料进行了表征。还确定了比表面积（BET）、位点数密度和零电荷点（pH(pzc)）。通过将实验数据拟合到准一级和准二级模型来获得动力学参数。不同的等温线模型被应用于描述 As(V)的吸附行为。CFe 和 CarFe 对 As(V)的吸附动力学很好地符合准二级模型（分别为 R(2) = 0.9994 和 0.999）。CFe 的最大 As(V)吸附量为 1.8 mg g(-1)，CarFe 的最大 As(V)吸附量为 1.4 mg g(-1)。结果表明，两种材料对 As(V)的吸附都同样有用。CFe 和 CarFe 的 As(V)实验等温线数据符合 Freundlich 模型。
