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用间苯二胺作为水相第二单体,研究了微量间苯二胺对聚哌嗪酰胺复合纳滤膜性能的影响。间苯二胺添加质量分数为0~0.05%,研究了该变量对纳滤膜盐截留率、水通量、表面形貌、水接触角的影响。结果表明,随着微量间苯二胺添加,纳滤膜对氯化钠的截留性能明显上升(34%至90%),水通量明显下降(112 L/(m2·h)至23 L/(m2·h)),膜亲水性下降。X射线光电子能谱结果表明,微量间苯二胺的添加,使得复合层交联度上升,从而进一步引起上述膜性能变化。因此,在纳滤膜生产中,微量间苯二胺可以作为水相的第二单体调控纳滤膜的性能,同时应避免间苯二胺污染引起的膜性能波动。
Using m-phenylenediamine as the second monomer in aqueous phase, the effect of micro-m-phenylenediamine on the performance of poly-piperazineamide composite nanofiltration membrane was studied. The content of m-phenylenediamine was 0 ~ 0.05%, and the effect of the variables on salt rejection, water flux, surface morphology and water contact angle of nanofiltration membrane was studied. The results showed that with the addition of trace amount of m-phenylenediamine, the nanofiltration membrane showed a significant increase in sodium chloride rejection (34% -90%) and a significant decrease in water flux (112 L / (m2 · h) to 23 L / (m2 · h)), the hydrophilicity of the membrane is decreased. The results of X-ray photoelectron spectroscopy show that the addition of trace amount of phenylenediamine leads to the increase of the degree of crosslinking of the composite layer, which further leads to the change of the film properties. Therefore, in the production of nanofiltration membrane, trace amount of phenylenediamine can be used as the second monomer in the aqueous phase to control the performance of the nanofiltration membrane, meanwhile, the membrane performance caused by the pollution of metaphenylenediamine should be avoided.