Daramola Michael Olawale, Hlanyane Palesa, Sadare Oluwafolakemi O, Oluwasina Olugbenga O, Iyuke Sunny E
School of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, Private Bag 3, Wits 2050, South Africa.
Department of Chemistry, School of Sciences, Federal University of Technology, Akure 220001, Nigeria.
Membranes (Basel). 2017 Mar 6;7(1):14. doi: 10.3390/membranes7010014.
Effect of the dispersion method employed during the synthesis of carbon nanotube (CNT)/polysulfone-infused composite membranes on the quality and separation performance of the membranes during oil-water mixture separation is demonstrated. Carbon nanotube/polysulfone composite membranes containing 5% CNT and pure polysulfone membrane (with 0% CNT) were synthesized using phase inversion. Three CNT dispersion methods referred to as Method 1 (M1), Method 2 (M2), and Method 3 (M3) were used to disperse the CNTs. Morphology and surface property of the synthesized membranes were checked with scanning electron microscopy (SEM) and Fourier-transform infrared (FTIR) spectroscopy, respectively. Separation performance of the membranes was evaluated by applying the membrane to the separation of oil-water emulsion using a cross-flow filtration setup. The functional groups obtained from the FTIR spectra for the membranes and the CNTs included carboxylic acid groups (O-H) and carbonyl group (C=O) which are responsible for the hydrophilic properties of the membranes. The contact angles for the membranes obtained from Method 1, Method 2, and Method 3 were 76.6° ± 5.0°, 77.9° ± 1.3°, and 77.3° ± 4.5°, respectively, and 88.1° ± 2.1° was obtained for the pure polysulfone membrane. The oil rejection (OR) for the synthesized composite membranes from Method 1, Method 2, and Method 3 were 48.71%, 65.86%, and 99.88%, respectively, indicating that Method 3 resulted in membrane of the best quality and separation performance.
展示了在碳纳米管（CNT）/聚砜注入复合膜合成过程中所采用的分散方法对油水混合物分离过程中膜的质量和分离性能的影响。采用相转化法合成了含5%碳纳米管的碳纳米管/聚砜复合膜和纯聚砜膜（含0%碳纳米管）。使用三种碳纳米管分散方法，分别称为方法1（M1）、方法2（M2）和方法3（M3）来分散碳纳米管。分别用扫描电子显微镜（SEM）和傅里叶变换红外（FTIR）光谱法检查合成膜的形态和表面性质。通过使用错流过滤装置将膜应用于油水乳液的分离来评估膜的分离性能。从膜和碳纳米管的FTIR光谱获得的官能团包括负责膜亲水性的羧酸基团（O-H）和羰基（C=O）。方法1、方法2和方法3所得膜的接触角分别为76.6°±5.0°、77.9°±1.3°和77.3°±4.5°，纯聚砜膜的接触角为88.1°±2.1°。方法1、方法2和方法3合成的复合膜的拒油率（OR）分别为48.71%、65.86%和99.88%，表明方法3得到的膜质量和分离性能最佳。
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