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采用β-环糊精(β-CD)对沸石(ZSM-5)进行化学改性,得到3种β-CD修饰的沸石,并将改性后的沸石填充到聚醚型聚氨酯(PU)中,制备了3种改性膜。采用红外光谱(FTIR)、扫描电镜(SEM)和热重(TG)手段对改性的沸石以及改性膜进行了结构和热性质表征,考察了不同改性沸石填充膜的渗透汽化脱酚性能。结果表明,填充了改性沸石的PU膜可以有效分离苯酚/水混合物中的苯酚,3种改性沸石填充的膜的渗透通量均显著大于未改性沸石填充膜和空白膜,其中以异氰酸酯为桥联结构接枝环糊精沸石填充膜综合分离性能最佳,对于80℃含0.3%的苯酚水溶液,渗透通量为43.35 kg·μm/(m~2·h),分离因子为15.24。
The zeolite (ZSM-5) was chemically modified with β-cyclodextrin (β-CD) to obtain three β-CD modified zeolites, and the modified zeolite was filled into a polyether polyurethane (PU) , Prepared three kinds of modified membrane. The structure and thermal properties of modified zeolites and modified films were characterized by FTIR, SEM and TG. The effects of pervaporation, depolymerization and phenol removal of modified zeolites were investigated. . The results showed that the modified zeolite filled PU membrane can effectively separate the phenol / water mixture of phenol, the three modified zeolite filled membrane permeation flux were significantly greater than the unmodified zeolite membrane and blank membrane, with isocyanate The results showed that the composite membrane was the best for the grafting of cyclodextrin zeolite with a bridge structure. The permeation flux was 43.35 kg · μm / (m ~ 2 · h) with a phenol concentration of 0.3% at 80 ℃ and the separation factor was 15.24.