Pandey Sumit Kumar, Srivastava Anchal
Department of Physics, Institute of Science, Banaras Hindu University Varanasi 221005 India
RSC Adv. 2022 Jan 10;12(3):1550-1562. doi: 10.1039/d1ra07423g. eCollection 2022 Jan 5.
To address the global challenge of water pollution, membrane-based technologies are being used as a dignified separation technology. However, designing low-cost, reusable, freestanding and flexible membranes for wastewater treatment with tunable pore size, good mechanical strength, and high separation efficiency is still a major challenge. Herein, we report the development of a scalable, reusable, freestanding, flexible and functionalized multiwalled carbon nanotube (FMWCNT) membrane filter with tunable pore size for wastewater treatment, which has attractive attributes such as high separation efficiency (>99% for organic dyes and ∼80% for salts), permeance (∼225 L h m bar), tensile strength (∼6 MPa), and reusability of both the membrane as well as contaminants separately. This FMWCNTs membrane filter has been developed by a simple vacuum-assisted filtration technique followed by the synthesis of MWCNTs using a cost-effective spray pyrolysis assisted chemical vapor deposition (CVD) technique and chemical functionalization. This study deals with understanding the rejection, retrieval, and reusability of both the membranes as well as waterborne contaminants separately. The developed membrane filter has potential utility in many applications such as wastewater treatment, food industry, and life sciences due to its robust mechanical and separation performance characteristics.
为应对水污染这一全球性挑战，基于膜的技术正被用作一种有尊严的分离技术。然而，设计用于废水处理的低成本、可重复使用、独立且灵活的膜，使其具有可调孔径、良好的机械强度和高分离效率，仍然是一项重大挑战。在此，我们报告了一种用于废水处理的具有可调孔径的可扩展、可重复使用、独立、灵活且功能化的多壁碳纳米管（FMWCNT）膜过滤器的开发，该过滤器具有诸如高分离效率（有机染料>99%，盐类约80%）、渗透通量（约225 L h m bar）、拉伸强度（约6 MPa）以及膜和污染物均可单独重复使用等吸引人的特性。这种FMWCNTs膜过滤器是通过一种简单的真空辅助过滤技术，随后使用具有成本效益的喷雾热解辅助化学气相沉积（CVD）技术合成MWCNTs并进行化学功能化而开发的。本研究分别探讨了膜以及水中污染物的截留、回收和可重复使用性。所开发的膜过滤器因其强大的机械和分离性能特性，在废水处理、食品工业和生命科学等许多应用中具有潜在用途。
