Department of Organic and Inorganic Chemistry, Faculty of Sciences, University of Extremadura, Badajoz, Spain.
J Colloid Interface Sci. 2012 Nov 15;386(1):325-32. doi: 10.1016/j.jcis.2012.07.038. Epub 2012 Aug 2.
A natural peat has been used as an adsorbent for the removal of hexavalent chromium from aqueous solution. The peat was firstly characterized in terms of particle size and chemical composition (ash content, pH of the point of zero charge, FT-IR and thermal analysis). Next, the kinetic and equilibrium aspects of the adsorption of Cr(VI) by this adsorbent were studied. The kinetic data were satisfactorily fitted to a kinetic law of partial order in C equal to one. The specific adsorption rates are around 10(-4)s(-1), increasing as temperature does. A noticeable influence of diffusion on the global adsorption process has been demonstrated. Finally, the equilibrium isotherms were satisfactorily fitted to a previously proposed model. The adsorption capacity of Cr(VI) was similar to some other previously reported and the affinity of Cr(VI) towards the active sites of the adsorbent increases as temperature rises.
一种天然泥炭被用作从水溶液中去除六价铬的吸附剂。首先对泥炭进行了颗粒大小和化学成分（灰分含量、零电荷点的 pH 值、FT-IR 和热分析）的特征描述。然后，研究了该吸附剂对 Cr(VI)的吸附的动力学和平衡方面。动力学数据很好地符合 C 等于 1 的部分顺序动力学定律。特定吸附速率约为 10(-4)s(-1)，随温度升高而增加。扩散对整体吸附过程有明显的影响。最后，平衡等温线很好地符合了先前提出的模型。Cr(VI)的吸附容量与其他一些先前报道的相似，并且 Cr(VI)对吸附剂活性位点的亲和力随温度升高而增加。
