Arias Arias Fabian, Guevara Marco, Tene Talia, Angamarca Paola, Molina Raul, Valarezo Andrea, Salguero Orlando, Vacacela Gomez Cristian, Arias Melvin, Caputi Lorenzo S
Grupo de Investigación de Materiales Avanzados, Facultad de Ciencias, Escuela Superior Politécnica de Chimborazo, Riobamba EC-060155, Ecuador.
Faculty of Mechanical Engineering, Escuela Superior Politécnica de Chimborazo, Riobamba EC-060155, Ecuador.
Nanomaterials (Basel). 2020 Apr 4;10(4):681. doi: 10.3390/nano10040681.
Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to describe the adsorption kinetics of MB onto rGO, suggesting an equilibrium time of 30 min. Otherwise, the Langmuir model was more suitable to describe the adsorption isotherms, indicating a maximum adsorption capacity of 121.95 mg g at 298 K. In addition, kinetics and thermodynamic analyses demonstrated that the adsorption of MB onto rGO can be treated as a mixed physisorption-chemisorption process described by H-bonding, electrostatic, and π - π interactions. These results show the potential of green-prepared rGO to remove cationic dyes from wastewater systems.
最近，绿色制备的氧化石墨烯在水净化和废水处理方面引起了极大的关注。在此，通过一种可扩展且环保的方法制备了还原氧化石墨烯（rGO），并探索了其从水体系中去除亚甲基蓝（MB）的潜在用途。目前的工作包括制备rGO的绿色方案以及相应的光谱和形态表征，还有几个动力学、等温线和热力学分析，以成功证明MB的吸附情况。拟二级模型适用于描述MB在rGO上的吸附动力学，表明平衡时间为30分钟。此外，朗缪尔模型更适合描述吸附等温线，表明在298 K时最大吸附容量为121.95 mg/g。此外，动力学和热力学分析表明，MB在rGO上的吸附可视为通过氢键、静电和π-π相互作用描述的混合物理吸附-化学吸附过程。这些结果表明了绿色制备的rGO从废水体系中去除阳离子染料的潜力。
