Department of Integrated Transport Technology and Environmental Protection, Maritime University of Szczecin, H. Pobożnego St. 11, 70-507 Szczecin, Poland.
Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Pułaskiego St. 10, 70-322 Szczecin, Poland.
J Colloid Interface Sci. 2017 Jul 1;497:155-164. doi: 10.1016/j.jcis.2017.03.008. Epub 2017 Mar 2.
In this study, magnetic Fe@graphite nanocomposite (Fe@G-N) with a core-shell structure was prepared by chemical vapor deposition CVD process for the adsorptive removal of anionic dyes from aqueous solutions. Fe@G-N was characterized by XRD, HRTEM, HAADF-STEM, FTIR, Raman spectroscopy, BET and zeta potential measurements, and then applied in adsorption of two kinds of anionic dyes, Acid Red 88 (AR88) and Direct Orange 26 (DO26). The effect of parameters like initial dye concentration (5-40mgL), pH solution (4-10) and temperature (20-60°C) on the adsorption process was studied. The pseudo-first-order, pseudo-second-order kinetic models and the intraparticle diffusion model were used to describe the kinetic data. A kinetic study indicated that a pseudo-second-order model agreed well with the experimental data. The experimental data were analyzed by the Langmuir and Freundlich adsorption models. Adsorption equilibrium studies showed that adsorption of AR88 and DO26 followed the Langmuir model. Thermodynamic parameters such as Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) were also obtained and analyzed.
在这项研究中，通过化学气相沉积（CVD）工艺制备了具有核壳结构的磁性 Fe@石墨纳米复合材料（Fe@G-N），用于从水溶液中吸附去除阴离子染料。通过 XRD、HRTEM、HAADF-STEM、FTIR、拉曼光谱、BET 和 ζ 电位测量对 Fe@G-N 进行了表征，然后将其应用于两种阴离子染料，酸性红 88（AR88）和直接橙 26（DO26）的吸附。研究了初始染料浓度（5-40mg/L）、溶液 pH（4-10）和温度（20-60°C）等参数对吸附过程的影响。采用伪一级、伪二级动力学模型和内扩散模型来描述动力学数据。动力学研究表明，伪二级模型与实验数据吻合较好。通过 Langmuir 和 Freundlich 吸附模型对实验数据进行了分析。吸附平衡研究表明，AR88 和 DO26 的吸附符合 Langmuir 模型。还获得并分析了热力学参数，如吉布斯自由能（ΔG°）、焓（ΔH°）和熵（ΔS°）。
