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Synergistic SA/Pebax composite membranes on ceramic supports for efficient ethanol–water separation
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DOI：10.1039/D5RA09375A.png)
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Abstract
En 中文
Efficient ethanol–water separation is vital for sustainable biofuel production; yet conventional techniques remain energy-intensive. This work presents synergistic sodium alginate (SA)/Pebax composite membranes supported on ceramic tubes for high-performance pervaporation. By tuning SA/Pebax ratios (5 : 1 to 3 : 2) and applying glutaraldehyde crosslinking; the membranes exhibit enhanced thermal stability; mechanical strength; and hydrophilicity. FTIR and SEM confirm successful blending and uniform morphology; while AFM reveals controlled surface roughness. Increasing the Pebax composition in the polymer blend improved thermal stability while reducing the swelling degree. Tensile strength tests showed that the 4 : 1 ratio provided a balanced performance; with a tensile strength of 12.04 MPa and elongation of 30.65%. At 50 °C and 90 wt% ethanol feed; the SA/Pebax (4 : 1) membrane achieves a flux of 133 g m−2 h−1 and a separation factor of 281; raising the separation factor from 5 for pure SA to 281 (56 times). These findings demonstrate that SA/Pebax composite membranes provide opportunities for energy-efficient solutions for water/ethanol separation; aligning with sustainable chemical processing goals.
Keywords:
Ethanol–water separation
Pervaporation
Sodium alginate
Pebax
Ceramic supports
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