Ndeh Nji T, Sairiam Sermpong, Nuisin Roongkan
International Program in Hazardous Substance and Environmental Management, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok 10330, Thailand.
International Program in Hazardous Substance and Environmental Management, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok 10330, Thailand; Water Science and Technology for Sustainable Environment Research Unit, Chulalongkorn University, Bangkok 10330, Thailand; Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Int J Biol Macromol. 2024 Dec;282(Pt 3):137005. doi: 10.1016/j.ijbiomac.2024.137005. Epub 2024 Oct 29.
This study investigates graphene oxide (GO) modified poly(vinylidene fluoride) (PVDF) membranes focusing on their dye rejection efficiency and their antifouling properties against bovine serum albumin (BSA). These membranes were prepared by modifying commercial PVDF membrane with a thin layer of GO nanosheets and chitosan (CS) using vacuum filtration. The synergistic physicochemical properties of the GO-CS/PVDF membranes were analyzed by XRD, FTIR, Raman, and XPS spectroscopy. The surface morphologies were observed by SEM and AFM microscopy, and WCA measurements. The deposition of GO and CS in the presence of citric acid resulted in a decrease in pore size and an increase in hydrophilicity. Modified membranes showed enhanced rejection of RB and MB, with rates increasing from 13.0 to 96.0 % and 28.3 to 69.1 %, respectively. Antifouling studies using BSA on selected membranes outperformed pristine membranes, which had higher irreversible fouling due to pore blockage. GO-CS/PVDF membranes exhibited higher flux recovery and lower irreversible fouling due to increased hydrophilicity, which prevents tight cake layer formation. Minimal detachment of the GO-CS layer during the long-term stability test is confirmed by minor fluctuations in dye flux and rejection. In summary, enhancing PVDF membranes with GO and CS augments dye rejection rates and bolsters antifouling properties.
本研究考察了氧化石墨烯（GO）改性的聚偏氟乙烯（PVDF）膜，重点关注其对染料的截留效率以及对牛血清白蛋白（BSA）的抗污染性能。这些膜是通过真空过滤用一层薄的氧化石墨烯纳米片和壳聚糖（CS）对商用PVDF膜进行改性制备而成。通过XRD、FTIR、拉曼光谱和XPS光谱分析了GO-CS/PVDF膜的协同物理化学性质。通过扫描电子显微镜（SEM）、原子力显微镜（AFM）和接触角测量（WCA）观察了表面形貌。在柠檬酸存在下，GO和CS的沉积导致孔径减小和亲水性增加。改性膜对罗丹明B（RB）和亚甲基蓝（MB）的截留率提高，截留率分别从13.0%提高到96.0%和从28.3%提高到69.1%。使用BSA对选定膜进行的抗污染研究表明，其性能优于原始膜，原始膜因孔堵塞而具有更高的不可逆污染。由于亲水性增加，GO-CS/PVDF膜表现出更高的通量回收率和更低的不可逆污染，这可防止紧密滤饼层的形成。在长期稳定性测试中，染料通量和截留率的微小波动证实了GO-CS层的最小脱落。总之，用GO和CS增强PVDF膜可提高染料截留率并增强抗污染性能。
