發(fā)布時(shí)間：2018-05-08 07:50

  本文選題：分子篩 + 膜　； 參考：《化工學(xué)報(bào)》2017年11期

【摘要】：利用二次生長(zhǎng)法,以十六烷基三甲基溴化銨(CTAB)為結(jié)構(gòu)導(dǎo)向劑,一步水熱合成了多級(jí)孔道ZSM-5分子篩膜。結(jié)果表明,CTAB球形膠束與分子篩顆粒自組裝形成了介孔結(jié)構(gòu),同時(shí),CTAB膠束及疏水長(zhǎng)鏈抑制了晶體的長(zhǎng)大。通過調(diào)整CTAB/SiO_2摩爾比、合成溫度及晶化時(shí)間等制膜條件,改變分子篩膜的晶體顆粒尺寸及膜層交聯(lián)度,實(shí)現(xiàn)了分子篩膜介孔結(jié)構(gòu)的有效調(diào)節(jié),其孔徑范圍7~30 nm。在CTAB/SiO_2摩爾比為0.05、合成溫度180℃、時(shí)間20 h下,多級(jí)孔分子篩膜純水滲透通量達(dá)到138 kg·m~(-2)·h~(-1)·MPa~(-1),截留分子量28500,對(duì)應(yīng)平均孔徑7.39 nm,達(dá)到小孔徑超濾的標(biāo)準(zhǔn)。
[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，

本文編號(hào)：1860570