Acarer-Arat Seren, Pir İnci, Tüfekci Mertol, Güneş-Durak Sevgi, Akman Alp, Tüfekci Neşe
Istanbul University-Cerrahpaşa, Faculty of Engineering, Department of Environmental Engineering, Avcilar, 34320 Istanbul, Turkey.
Istanbul Technical University, Faculty of Mechanical Engineering, Gumussuyu, Istanbul 34437, Turkey.
ACS Omega. 2024 Oct 2;9(41):42159-42171. doi: 10.1021/acsomega.4c03038. eCollection 2024 Oct 15.
In this research, cellulose acetate (CA) and CA nanocomposite membranes, reinforced with mass fractions of cellulose nanofibrils (CNF), are prepared using the phase separation technique. The membranes are extensively characterized using several techniques: Fourier Transform Infrared (FTIR) spectroscopy confirms the chemical structures, while Scanning Electron Microscopy (SEM) reveals their surface morphology. Mechanical characterization is conducted to explore the mechanical behavior of the membranes under wet and dry conditions through tensile testing. The mechanical properties of CA and CA-CNF membranes are also estimated using the Mori-Tanaka mean-field homogenization method and compared to experimental findings. The flux performance for pure and dam water, assessed at 3 bar, demonstrates that CNF reinforcement notably enhances the CA membrane's performance, particularly in flux rate and fouling resistance. The CA membrane shows high efficiency in removing Fe, Ba, and Al from dam water, while CA-CNF membranes exhibit a varied range of removal efficiencies for the same ions, with the 0.5 wt % CNF variant showing superior resistance to surface fouling. Additionally, while CNF increases tensile strength and stiffness, it leads to earlier failure under smaller deformations, especially at higher concentrations. This research provides a detailed assessment of CA and CA-CNF membranes, examining their chemical, structural, and mechanical properties alongside their effectiveness in water treatment applications.
在本研究中，采用相分离技术制备了醋酸纤维素（CA）以及用纤维素纳米原纤（CNF）质量分数增强的CA纳米复合膜。使用多种技术对这些膜进行了广泛表征：傅里叶变换红外（FTIR）光谱确定了化学结构，而扫描电子显微镜（SEM）揭示了它们的表面形态。通过拉伸试验进行力学表征，以探究膜在湿态和干态条件下的力学行为。还使用Mori-Tanaka平均场均匀化方法估算了CA膜和CA-CNF膜的力学性能，并与实验结果进行了比较。在3巴压力下评估的纯水和坝水通量性能表明，CNF增强显著提高了CA膜的性能，特别是在通量率和抗污染方面。CA膜在去除坝水中的铁、钡和铝方面表现出高效率，而CA-CNF膜对相同离子的去除效率范围各异，其中0.5 wt% CNF变体表现出对表面污染的优异抗性。此外，虽然CNF提高了拉伸强度和刚度，但它会导致在较小变形下更早失效，尤其是在较高浓度时。本研究对CA膜和CA-CNF膜进行了详细评估，考察了它们的化学、结构和力学性能以及在水处理应用中的有效性。
