介孔分子硅剂改善茶浓缩膜结构特性应用研究

为有效提高功能性茶浓缩反渗透膜的回收效率和抗污性能,探究了3种介孔分子硅材料(MCM-41、SBA-15和MCFs)对浓缩膜面聚酰胺层聚合形成过程的结构影响。结果表明,添加质量分数0.02%经磺化预处理的MCM-41于间苯二胺水相可接枝酰氯基团,形成的聚酰胺结构层峰谷粗糙跨度仅为220 nm且交联紧致,膜抗拉伸强度增加37.8%;SBA-15和MCFs相膜面峰谷跨度达500~780 nm,横向褶皱和团聚,结构存在孔道塌陷;改性膜在3 h内对茶多酚、茶多糖、茶蛋白即可达到最大浓缩度,减少50%浓缩时间;MCM-41和SBA-15膜长时间运行的浓缩降率仅为2.8%~6.1%,48 h下降率比显示改性膜达标使用时长增加112.5%~137.5%,亲水性和抗污堵能力均大幅提升,可有效满足功能化茶浓缩精度。

Study on the Application of Mesoporous Molecular Silicon for the Structural Characteristics Improvement of Tea Concentrated Membrane

I n order to effectively improve the recovery efficiency and anti-fouling performance of functional tea concentrated reverse osmosis membrane,t he effects of three mesoporous molecular silicon materials(MCM-41/SBA-15/MCFs)on the structure in polymerization process of polyamide layer were investigated.The results showed that,sulfonated pretreated MCM-41 with mass fraction of 0.02% in the aqueous phase of m-phenylenediamine could graft the acid chloride group.Modified polyamide structure layer had a peak-to-valley roughness span of only 220 nm and cross-linked lead to a 37.8%increase in tensile strength of the film.SBA-15 and MCFs had a peak-to-valley span of 500~780 nm,lateral folds and agglomeration,and structural pore collapse.The modified membrane could reach the maximum concentration of tea polyphenols,tea polysaccharides and tea protein within 3 h,reducing the concentration time by 50%.The concentration reduction rate of MCM-41 and SBA-15 membranes for long-term operation was only 2.8%~6.1%,and the 48 h reduction ratio showed that modified membrane reached the standard length of use by 112.5%~137.5%.Both hydrophilicity and anti-fouling ability were greatly improved,which could effectively meet the functionalized tea concentration precision.