Khan Fahad Saleem Ahmed, Mubarak Nabisab Mujawar, Tan Yie Hua, Khalid Mohammad, Karri Rama Rao, Walvekar Rashmi, Abdullah Ezzat Chan, Nizamuddin Sabzoi, Mazari Shaukat Ali
Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, 98009 Miri, Sarawak, Malaysia.
Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, 98009 Miri, Sarawak, Malaysia.
J Hazard Mater. 2021 Jul 5;413:125375. doi: 10.1016/j.jhazmat.2021.125375. Epub 2021 Feb 12.
Industrial effluents contain several organic and inorganic contaminants. Among others, dyes and heavy metals introduce a serious threat to drinking waterbodies. These pollutants can be noxious or carcinogenic in nature, and harmful to humans and different aquatic species. Therefore, it is of high importance to remove heavy metals and dyes to reduce their environmental toxicity. This has led to an extensive research for the development of novel materials and techniques for the removal of heavy metals and dyes. One route to the removal of these pollutants is the utilization of magnetic carbon nanotubes (CNT) as adsorbents. Magnetic carbon nanotubes hold remarkable properties such as surface-volume ratio, higher surface area, convenient separation methods, etc. The suitable characteristics of magnetic carbon nanotubes have led them to an extensive search for their utilization in water purification. Along with magnetic carbon nanotubes, the buckypaper (BP) membranes are also favorable due to their unique strength, high porosity, and adsorption capability. However, BP membranes are mostly used for salt removal from the aqueous phase and limited literature shows their applications for removal of heavy metals and dyes. This study focuses on the existence of heavy metal ions and dyes in the aquatic environment, and methods for their removal. Various fabrication approaches for the development of magnetic-CNTs and CNT-based BP membranes are also discussed. With the remarkable separation performance and ultra-high-water flux, magnetic-CNTs, and CNT-based BP membranes have a great potential to be the leading technologies for water treatment in future.
工业废水含有多种有机和无机污染物。其中，染料和重金属对饮用水水体构成严重威胁。这些污染物本质上可能有毒或致癌，对人类和不同的水生物种有害。因此，去除重金属和染料以降低其环境毒性至关重要。这引发了对开发去除重金属和染料的新型材料和技术的广泛研究。去除这些污染物的一种途径是利用磁性碳纳米管（CNT）作为吸附剂。磁性碳纳米管具有诸如表面体积比、更高的表面积、便捷的分离方法等显著特性。磁性碳纳米管的合适特性使其在水净化领域得到广泛研究。除了磁性碳纳米管，巴基纸（BP）膜也因其独特的强度、高孔隙率和吸附能力而备受青睐。然而，BP膜大多用于从水相中去除盐分，仅有有限的文献表明其在去除重金属和染料方面的应用。本研究聚焦于水环境中重金属离子和染料的存在情况以及去除它们的方法。还讨论了用于制备磁性碳纳米管和基于碳纳米管的BP膜的各种制造方法。凭借卓越的分离性能和超高的水通量，磁性碳纳米管和基于碳纳米管的BP膜在未来极有可能成为水处理的主导技术。
