多级孔道ZSM-5分子筛超滤膜的制备

发布时间：2018-05-08 07:50

  本文选题：分子筛 + 膜　； 参考：《化工学报》2017年11期

【摘要】：利用二次生长法,以十六烷基三甲基溴化铵(CTAB)为结构导向剂,一步水热合成了多级孔道ZSM-5分子筛膜。结果表明,CTAB球形胶束与分子筛颗粒自组装形成了介孔结构,同时,CTAB胶束及疏水长链抑制了晶体的长大。通过调整CTAB/SiO_2摩尔比、合成温度及晶化时间等制膜条件,改变分子筛膜的晶体颗粒尺寸及膜层交联度,实现了分子筛膜介孔结构的有效调节,其孔径范围7~30 nm。在CTAB/SiO_2摩尔比为0.05、合成温度180℃、时间20 h下,多级孔分子筛膜纯水渗透通量达到138 kg·m~(-2)·h~(-1)·MPa~(-1),截留分子量28500,对应平均孔径7.39 nm,达到小孔径超滤的标准。
[Abstract]:Using cetyltrimethylammonium bromide (cetyltrimethylammonium bromide) as structure guide, a multistage porous channel ZSM-5 molecular sieve membrane was synthesized by secondary growth method. The results show that the mesoporous structure is formed by self-assembly of CTAB spherical micelles with molecular sieve particles, and the growth of crystal is inhibited by CTAB micelles and hydrophobic long chains. By adjusting the CTAB/SiO_2 molar ratio, synthesis temperature and crystallization time, and changing the crystal particle size and the cross-linking degree of the membrane layer, the effective adjustment of the mesoporous structure of the molecular sieve membrane was realized. The pore size range was 730 nm. When the molar ratio of CTAB/SiO_2 is 0.05, the synthesis temperature is 180 鈩，

本文编号：1860570