Abu-Nada Abdulrahman, McKay Gordon, Abdala Ahmed
Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, PO Box 34110, Doha, Qatar.
Chemical Engineering Program, Texas A&M University at Qatar, POB 23874, Doha, Qatar.
Nanomaterials (Basel). 2020 Mar 24;10(3):595. doi: 10.3390/nano10030595.
The presence of traces of heavy metals in wastewater causes adverse health effects on humans and the ecosystem. Adsorption is a low cost and eco-friendly method for the removal of low concentrations of heavy metals from wastewater streams. Over the past several years, graphene-based materials have been researched as exceptional adsorbents. In this review, the applications of graphene oxide (GO), reduce graphene oxide (rGO), and graphene-based nanocomposites (GNCs) for the removal of various metals are analyzed. Firstly, the common synthesis routes for GO, rGO, and GNCs are discussed. Secondly, the available literature on the adsorption of heavy metals including arsenic, lead, cadmium, nickel, mercury, chromium and copper using graphene-based materials are reviewed and analyzed. The adsorption isotherms, kinetics, capacity, and removal efficiency for each metal on different graphene materials, as well as the effects of the synthesis method and the adsorption process conditions on the recyclability of the graphene materials, are discussed. Finally, future perspectives and trends in the field are also highlighted.
废水中痕量重金属的存在会对人类健康和生态系统造成不利影响。吸附是一种从废水流中去除低浓度重金属的低成本且环保的方法。在过去几年中,基于石墨烯的材料已被研究作为优异的吸附剂。在本综述中,分析了氧化石墨烯(GO)、还原氧化石墨烯(rGO)和基于石墨烯的纳米复合材料(GNCs)在去除各种金属方面的应用。首先,讨论了GO、rGO和GNCs的常见合成路线。其次,综述并分析了关于使用基于石墨烯的材料吸附包括砷、铅、镉、镍、汞、铬和铜在内的重金属的现有文献。讨论了每种金属在不同石墨烯材料上的吸附等温线、动力学、容量和去除效率,以及合成方法和吸附工艺条件对石墨烯材料可回收性的影响。最后,还强调了该领域的未来前景和趋势。