Department of Environmental Protection, Green Technology Research Institute, CPC Corporation, Taiwan, Chia-Yi 60051, No.2, Tsuo-Nan Rd., Kaohsiung 81126, Chinese Taiwan.
Water Sci Technol. 2013;67(6):1247-53. doi: 10.2166/wst.2013.682.
Disposal and penetration of carbon nanotubes (CNTs) into the environment have raised increasing concerns over the years. In this study, a laboratory scale electro-microfiltration (EMF) was used to treat water containing single wall carbon nanotubes (SWCNTs) and multi-wall carbon nanotubes (MWCNTs). The goal was to examine and compare the performance during EMF of SWCNT and MWCNT. The results showed that the initial flux was increased as the applied electrical voltage increased. At an applied pressure of 49 kPa, the final flux was comparable to pure water flux when the applied electrical field strength was greater than the critical electrical field strength (Ecritical). In addition, dissolved organic carbon (DOC) removal efficiency increased as the electrical voltage increased. Due to high convective transport of organic matter toward the membrane at 98 kPa, a decrease in DOC removal efficiency with increasing electrical field strength was observed. Overall, the fluxes and DOC removal efficiencies for EMF of SWCNT and MWCNT were not significantly different with a 95% confidence.
多年来，碳纳米管（CNTs）的处置和渗透到环境中引起了越来越多的关注。在这项研究中，使用实验室规模的电微滤（EMF）来处理含有单壁碳纳米管（SWCNT）和多壁碳纳米管（MWCNT）的水。目的是检查和比较 EMF 中 SWCNT 和 MWCNT 的性能。结果表明，随着施加的电压增加，初始通量增加。在施加压力为 49 kPa 的情况下，当施加的电场强度大于临界电场强度（Ecritical）时，最终通量与纯水通量相当。此外，随着电压的增加，溶解有机碳（DOC）去除效率增加。由于在 98 kPa 下有机物向膜的对流传输较高，因此随着电场强度的增加观察到 DOC 去除效率降低。总体而言，SWCNT 和 MWCNT 的 EMF 的通量和 DOC 去除效率在 95%置信区间内没有显著差异。
