PES亲水改性超滤膜澄清葡萄原酒研究
Clarification of red wine by hydrophilic modification of PES ultrafiltration membranes
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摘要: 以抗菌、亲水性的TiO2为改性材料,采用相转化法制备PES/TiO2亲水改性超滤膜,用于葡萄原酒澄清研究。通过扫描电镜、傅立叶红外光谱仪和接触角测定仪对超滤前后的膜进行表征,结果显示,TiO2的加入增加了膜面粗糙度及亲水性,降低了原酒中蛋白质、多糖等大分子物质在膜面的吸附污染,使得改性膜超滤葡萄原酒渗透通量衰减率低于纯PES膜,提高了膜的抗污染性。当TiO2添加量为0.75%时,超滤2h,其渗透通量为18.09L/(m2·h)(纯膜为16.88L/(m2·h)),超滤后的葡萄酒液澄清度好。Abstract: TiO2hydrophilic modification of Poly ( ether sulfones) ( PES) ultrafiltration ( UF) membranes were prepared by phase inversion for clarification of red wine. The membranes were characterized by scanning electron microscope ( SEM) , Fourier transform-infrared ( FT- IR) and contact angle measurements, respectively.The results showed that the hydrophilic and surface roughness of PES/TiO2UF membranes was increased with increasing of content SiO2.The absorption of protein and polysaccharide on PES/TiO2UF membrane surfaces were decreased and membrane fouling was reduced due to the incorporation of SiO2into PES. In addition, the permeation flux attenuation of PES/TiO2UF membranes was lower than PES UF membrane.When 0.75% of molar content of SiO2was introduced into PES, PT75 UF membranes exhibited higher permeation flux of 18.09L / ( m2·h) than pure PES with a permeation flux of 16.88L / ( m2·h) for clarification of red wine. The UF clarified wine presents satisfied clarification.
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