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Dual-layer PES/P84 hollow fiber membranes with a PES–zeolite beta mixed matrix dense-selective layer of 0.55μm have been successfully fabricated in this study by adjusting the ratio of outer layer flow rate to inner layer flow rate during the spinning with the aid of heat-treatment at 235°C and two-step coating. To our best knowledge, this is the thinnest thickness that has ever been reported for...
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