Nassar Lobna, Hegab Hanaa M, Khalil Hiyam, Wadi Vijay S, Naddeo Vincenzo, Banat Fawzi, Hasan Shadi W
Center for Membranes and Advanced Water Technology (CMAT), Khalifa University of Science and Technology, 127788, Abu Dhabi, United Arab Emirates; Department of Civil Infrastructure and Environmental Engineering, Khalifa University of Science and Technology, 127788, Abu Dhabi, United Arab Emirates.
Center for Membranes and Advanced Water Technology (CMAT), Khalifa University of Science and Technology, 127788, Abu Dhabi, United Arab Emirates; Department of Chemical Engineering, Khalifa University of Science and Technology, 127788, Abu Dhabi, United Arab Emirates.
Sci Total Environ. 2022 Jun 10;824:153869. doi: 10.1016/j.scitotenv.2022.153869. Epub 2022 Feb 15.
Polylactides are a prominent class of biocompatible and biodegradable polymers that can be used to fabricate membranes for wastewater treatment. Excessive nutrient (phosphorus and nitrogen) concentrations in water bodies are a serious concern that has resulted in widespread health problems and potable water shortages. In this study, ultrafiltration (UF) membranes were prepared from polylactic acid (PLA) using the phase inversion method. Scanning electron microscope (SEM), thermogravimetric analyzer (TGA), and Fourier-transform infrared (FTIR) analysis were used to characterize the membranes. The hydrophilicity of the membrane surface was investigated by analyzing the water contact angle (CA). The results showed that the PLA membranes had a finger-like asymmetric morphology and various dense pore sizes. When the concentration of the PLA polymer increased from 15% to 20%, the removal of ammonium‑nitrogen (NH-N) increased from 41.9 ± 1.3% to 95.9 ± 3.1% and from 50% to 87% for synthetic and raw wastewater samples, respectively. Up to 52% removal rates of phosphates (PO-P) were achieved using PLA membranes. This study revealed a great opportunity to develop green, efficient, and sustainable PLA membranes for the treatment of wastewater with high nutrient content.
聚乳酸是一类重要的生物相容性和可生物降解聚合物，可用于制造用于废水处理的膜。水体中过量的营养物质（磷和氮）浓度是一个严重问题，已导致广泛的健康问题和饮用水短缺。在本研究中，采用相转化法由聚乳酸（PLA）制备超滤（UF）膜。使用扫描电子显微镜（SEM）、热重分析仪（TGA）和傅里叶变换红外（FTIR）分析对膜进行表征。通过分析水接触角（CA）研究膜表面的亲水性。结果表明，PLA膜具有指状不对称形态和各种致密孔径。当PLA聚合物的浓度从15%增加到20%时，合成废水和原废水样品中氨氮（NH-N）的去除率分别从41.9±1.3%增加到95.9±3.1%和从50%增加到87%。使用PLA膜实现了高达52%的磷酸盐（PO-P）去除率。这项研究揭示了开发绿色、高效和可持续的PLA膜用于处理高营养含量废水的巨大机会。
