Rasouli Seyedabbas, Rezaei Nima, Zendehboudi Sohrab, Duan Xili, Legge Raymond L, Chatzis Ioannis
Faculty of Engineering and Applied Science, Memorial University, St. John's, Newfoundland and Labrador A1B 3X5, Canada.
Department of Separation Science, School of Engineering Science, Lappeenranta-Lahti University of Technology, Lappeenranta FI-53851, Finland.
Langmuir. 2023 Mar 21;39(11):4100-4112. doi: 10.1021/acs.langmuir.2c03480. Epub 2023 Mar 9.
The development of continuous oil-water separation processes has applications in the treatment of industrial oily wastewater and effective management of oil spills. In this research, the performance of a superhydrophobic-superoleophilic (SHSO) membrane in oil-water separation is investigated through dynamic tests. We investigate the effects of the total flow rate and oil concentration on the separation efficiency using an as-fabricated SHSO mesh tube. To construct the SHSO membrane, a tubular stainless steel mesh is dip-coated into a solution, containing a long-chain alkyl silane (Dynasylan F8261) and functionalized silica nanoparticles (AEROSIL R812). The as-prepared SHSO mesh tube illustrates a water contact angle of 164° and an oil contact angle of zero for hexane. A maximum oil separation efficiency (SE) of 97% is obtained when the inlet oil-water mixture has the lowest flow rate (5 mL/min) with an oil concentration of 10 vol %, while the minimum oil SE (86%) is achieved for the scenario with the highest total flow rate (e.g., 15 mL/min) and the highest oil concentration (e.g., 50 vol %). The water SE of about 100% in the tests indicates that the water separation is not affected by the total flow rate and oil concentration, due to the superhydrophobic state of the fabricated mesh. The clear color of water and oil output streams also reveals the high SE of both phases in dynamic tests. The outlet oil flux increases from 314 to 790 (L/m·h) by increasing the oil permeate flow rate from 0.5 to 7.5 (mL/min). The linear behavior of the cumulative amounts of collected oil and water with time demonstrates the high separation performance of a single SHSO mesh, implying no pore blocking during dynamic tests. The significant oil SE (97%) of the fabricated SHSO membrane with robust chemical stability shows its promising potential for industrial-scale oil-water separation applications.
连续油水分离工艺的发展在工业含油废水处理和溢油有效管理方面具有应用价值。在本研究中，通过动态测试研究了超疏水-超亲油（SHSO）膜在油水分离中的性能。我们使用制备好的SHSO网筒研究总流量和油浓度对分离效率的影响。为构建SHSO膜，将管状不锈钢网浸入含有长链烷基硅烷（迪纳斯兰F8261）和功能化二氧化硅纳米颗粒（气相二氧化硅R812）的溶液中。制备好的SHSO网筒对水的接触角为164°，对己烷的油接触角为零。当入口油水混合物流量最低（5毫升/分钟）且油浓度为10体积%时，获得了97%的最大油分离效率（SE），而在总流量最高（如15毫升/分钟）且油浓度最高（如50体积%）的情况下，油SE最低（86%）。测试中约100%的水SE表明，由于所制备网的超疏水状态，水的分离不受总流量和油浓度的影响。水和油输出流清澈的颜色也表明了动态测试中两相的高SE。通过将油渗透流量从0.5增加到7.5（毫升/分钟），出口油通量从314增加到790（升/平方米·小时）。收集的油和水的累积量随时间的线性行为表明单个SHSO网具有高分离性能，这意味着在动态测试过程中没有孔堵塞。所制备的具有强大化学稳定性的SHSO膜的显著油SE（97%）显示出其在工业规模油水分离应用中的广阔前景。
