Cr(VI),有毒性作用,是一种重金属,由于其造成的各种损害,必须将其从环境中去除。在这项研究中,研究了使用分批吸附技术用Fe3O4基材料从水溶液中去除Cr(VI)污染物的方法。制备了磁性改性石墨烯纳米片(GNP)基纳米复合材料,并通过FTIR对其结构进行了表征,XRD,SEM,BET,和TGA技术。各种物理化学参数的影响,如吸附剂剂量,接触时间,初始Cr(VI)溶液浓度,pH值,并考察了共存离子(NaCl)的存在对吸附过程的影响。因此,确定了去除Cr(VI)的最佳条件。非线性朗缪尔,Freundlich,和Temkin等温线模型和伪一阶,伪二阶,并利用Bangham动力学模型研究了吸附机理。实验数据相对符合二阶动力学模型和Freundlich等温线模型。纯Fe3O4(Fe:GNP1:0)的最大吸附容量,Fe:GNP(2:1),和Fe:GNP(1:1)纳米复合材料在298K和pH约为5时获得12.71mg/g,27.03mg/g,和62.27毫克/克,分别。该结果表明,Cr(VI)去除随着复合材料中GNP量的增加而增加。一般来说,结果证实,磁性改性的GNP基吸附剂是功能性和有前途的材料,可用于去除水介质中的Cr(VI)等污染物。
Cr(VI), which has toxic effects, is a heavy metal and it must be removed from the environment due to the various damages it causes. In this study, the removal of Cr(VI) pollutants from aqueous solutions with Fe3O4-based materials using a batch adsorption technique was investigated. Magnetically modified graphene nanoplatelet (GNP)-based nanocomposites were prepared and their structures were characterized by FTIR, XRD, SEM, BET, and TGA techniques. The effects of various physicochemical parameters such as adsorbent dose, contact time, initial Cr(VI) solution concentration, pH, and the presence of coexisting ions (NaCl) on the adsorption process were investigated. Accordingly, the optimum conditions for Cr(VI) removal were determined. Nonlinear Langmuir, Freundlich, and Temkin isotherm models and pseudo-first-order, pseudo-second-order, and Bangham kinetic models were used to investigate the adsorption mechanism. The experimental data relatively fit the second-order kinetic model and the Freundlich isotherm model. The maximum adsorption capacities for pure Fe3O4 (Fe:GNP 1:0), Fe:GNP (2:1), and Fe:GNP (1:1) nanocomposite materials at 298 K and pH of approximately 5 were obtained as 12.71 mg/g, 27.03 mg/g, and 62.27 mg/g, respectively. This result showed that Cr(VI) removal increased as the amount of GNP in the composite material increased. Generally, the results confirmed that magnetically modified GNP-based adsorbents are functional and promising materials that can be used for the removal of pollutants such as Cr(VI) from aqueous media.