Department of Chemical Engineering-Postgraduate Program, State University of Maringá, Maringá, PR, Brazil.
Coordination of Chemical Engineering, Federal University of Technology - Paraná, Londrina, PR, Brazil.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2019;54(14):1400-1411. doi: 10.1080/10934529.2019.1646086. Epub 2019 Aug 4.
This study evaluates the application of the vegetal activated carbon (AC), vegetable AC impregnated with Ag and Cu (0.08% m/m) and cationic Supergel SGC650H resin for adsorption of Fe and Pb ions in closed and batch system. The best adsorption capacities were obtained by using the cationic resin SGC650H, pH 3, temperature of 30 °C and stirring speed of 100 rpm. Thus, the kinetic and equilibrium experiments, in mono- and bicomponent, were performed using SGC650H resin, wherein the kinetic models of pseudo-first and pseudo-second order presented a good fit to the kinetic data, for mono- and bicomponent, respectively. The Langmuir isotherm adequately represented the monocomponent equilibrium data, showing maximum adsorption capacities values of 7.18 and 4.00 meq g for Fe and Pb, respectively. An inhibitory effect between the metal species was verified by fitting the modified extended Langmuir isotherm model to the binary equilibrium data, which allowed to predict changes in the surface affinity to the adsorbent by the metal ions. Based on the observed results, the use of SGC650H resin presents great potential for water treatment systems contaminated with heavy metals.
本研究评估了植物活性炭（AC）、载银和载铜（0.08%m/m）的植物 AC 以及阳离子 Supergel SGC650H 树脂在封闭和批量系统中吸附 Fe 和 Pb 离子的应用。使用阳离子树脂 SGC650H、pH 值为 3、温度为 30°C 和搅拌速度为 100rpm 时，可获得最佳的吸附容量。因此，使用 SGC650H 树脂进行了单组分和双组分的动力学和平衡实验，其中准一级和准二级动力学模型分别很好地拟合了单组分和双组分的动力学数据。Langmuir 等温线很好地拟合了单组分平衡数据，分别显示出 Fe 和 Pb 的最大吸附容量值为 7.18 和 4.00 meq/g。通过将修正的扩展 Langmuir 等温线模型拟合到二元平衡数据，可以验证金属物种之间的抑制作用，这允许预测金属离子对吸附剂表面亲和力的变化。基于观察到的结果，SGC650H 树脂在处理受重金属污染的水系统方面具有很大的潜力。
