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采用相转化法制备掺杂介孔硅的共混纳滤膜。利用N2吸附-脱附和小角XRD测试对制备的介孔硅进行表征,结果证明共混膜中的掺杂材料为有序的介孔硅材料。利用扫描电子显微镜(SEM)对制备的共混膜截面进行表征,结果表明介孔硅的添加能够明显改变膜的结构和均匀性。研究了共混纳滤膜的截留分子量和耐污性能实验,结果表明介孔硅的添加能够缩小膜的孔径,其中,0.2wt%、0.5wt%、1.0wt%掺量共混纳滤膜的膜孔半径为0.78~2.13nm;均匀性越好的共混纳滤膜水通量变化越小,水通量恢复率越高。考察自制共混纳滤膜对富里酸的去除效果,结果表明掺杂介孔硅的共混纳滤膜可以明显提高对富里酸截留率,截留率最高的0.2wt%共混纳滤膜效果明显优于商业膜NF-70。
Preparation of mesoporous silica doped nanofiltration membrane by phase inversion method. The prepared mesoporous silica was characterized by N2 adsorption-desorption and small-angle XRD. The results showed that the doped material in the blended membrane was ordered mesoporous silica. The cross section of the prepared blend membrane was characterized by scanning electron microscopy (SEM). The results show that the addition of mesoporous silica can significantly change the structure and uniformity of the membrane. The experimental results of molecular weight and stain resistance of the nanofiltration membrane were studied. The results show that the mesoporous silica can reduce the pore size of the membrane. Among them, 0.2wt%, 0.5wt%, 1.0wt% nanofiltration membrane Membrane radius of 0.78 ~ 2.13nm; the better the uniformity of the nanofiltration membrane water flux changes, the higher the water flux recovery rate. The effect of self-made nanofiltration membrane on the removal of fulvic acid was investigated. The results showed that the mesoporous silica-doped nanofiltration membrane can significantly improve the retention of fulvic acid, the highest rejection rate of 0.2wt% Better than commercial film NF-70.