Kalahal Prakash B, Kulkarni Akshay S, Sajjan Ashok M, Khan T M Yunus, Anjum Badruddin Irfan, Kamangar Sarfaraz, Banapurmath Nagaraj R, Ayachit Narasimha H, Naik Manu L, Marakatti Vijaykumar S
Department of Chemistry, KLE Technological University, Hubballi 580031, India.
Center for Material Science, KLE Technological University, Hubballi 580031, India.
Membranes (Basel). 2021 Feb 4;11(2):110. doi: 10.3390/membranes11020110.
Tetraethylorthosilicate (TEOS)-crosslinked poly(vinyl alcohol) (PVA) solution was prepared and treated with benzaldehyde 2 sulphonic sodium salt acid (B2SA) for sulfonation. Different contents of graphene were incorporated into B2SA-grafted PVA-TEOS hybrid membrane to improve the membrane stability, mechanical strength, and overall pervaporation performance of the membranes. Membranes were fabricated using the casting technique. Developed membranes were then analyzed for their physicochemical changes by means of Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscope (SEM), wide-angle X-ray diffraction (WAXD), thermogravimetric analysis (TGA), contact angle analysis (CA), and mechanical strength. The lower d-spacing value observed in WAXD was evidence for the decreased inter-chain distance between the polymer chains. DSC exhibited the enhanced thermal stability of the developed membranes compared to the plane PVA membrane with enhancement in T value (106 °C), which was well above the pervaporation experimental temperature. Incorporation of graphene induced higher mechanical strength to the fabricated membranes. Further, the membranes were tested for the pervaporation separation of bioethanol. All the membranes were stable throughout the pervaporation studies, with M-2 G showing the total permeation flux of 11.66 × 10 kg/(m h) at 30 °C.
制备了正硅酸四乙酯（TEOS）交联的聚乙烯醇（PVA）溶液，并用苯甲醛-2-磺酸钠酸（B2SA）进行磺化处理。将不同含量的石墨烯掺入B2SA接枝的PVA-TEOS杂化膜中，以提高膜的稳定性、机械强度和整体渗透蒸发性能。采用流延技术制备膜。然后通过傅里叶变换红外光谱（FTIR）、差示扫描量热法（DSC）、扫描电子显微镜（SEM）、广角X射线衍射（WAXD）、热重分析（TGA）、接触角分析（CA）和机械强度对所制备的膜进行物理化学变化分析。WAXD中观察到的较低d间距值证明聚合物链之间的链间距离减小。与平面PVA膜相比，DSC显示所制备的膜具有更高的热稳定性，T值提高（106℃），远高于渗透蒸发实验温度。石墨烯的掺入使所制备的膜具有更高的机械强度。此外，对膜进行了生物乙醇的渗透蒸发分离测试。在整个渗透蒸发研究过程中，所有膜都很稳定，M-2 G在30℃时的总渗透通量为11.66×10 kg/(m²·h) 。
