Microporous Nickel-Coordinated Aminosilica Membranes for Improved Pervaporation Performance of Methanol/Toluene Separation
Microporous Nickel-Coordinated Aminosilica Membranes for Improved Pervaporation Performance of Methanol/Toluene Separation
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DOI：
10.1021/acsami.1c05012
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发表时间：
2021-05-06
影响因子：
9.5
通讯作者：
Tsuru, Toshinori
中科院分区：
文献类型：
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作者：
Anggarini, Ufafa;Yu, Liang;Tsuru, Toshinori
掺镍双[3-(三甲氧基硅基)丙基]胺(BTPA)衍生膜具有微孔配位网络，可作为渗透汽化分离甲醇-甲苯共沸混合物的理想屏障。Ni-BTPA膜的改性是通过使用镍掺杂剂取代胺基团，摩尔比(摩尔比)从0.125到0.50.在柔性富胺有机硅前驱体中掺入不同量的镍，提高了其刚性，得到了具有较大比表面积(从2.36m(2)g(-1)增加到282m(2)g(-1))和高孔容(从0.024增加到0.184 cm(3)g(-1))的多孔结构。掺镍BTPA(Ni-BTPA)膜的甲醇-甲苯分离性能随镍浓度的增加而提高。Ni-BTPA 0.50膜的分离性能优于其他类型的膜，在50℃的10wt%甲醇料液中，膜通量高达2.8 kg m(-2)h(-1)，分离系数大于900。这些结果表明，胺-镍配位产生的微孔与过量的镍离子之间的平衡有利于甲醇的高通量和分离。
The nickel-doped bis [3-(trimethoxysilyl) propyl] amine (BTPA) derived membrane has a microporous coordinated network that has high potential to be an ideal separation barrier for methanol-toluene azeotropic mixtures via the pervaporation process. Ni-BTPA membranes were modified by employing a nickel dopant over amine groups in mole ratios (mol/mol) that ranged from 0.125 to 0.50. The incorporation of different amounts of nickel dopant into flexible amine-rich organosilica precursors of BTPA increased the rigidity and resulted in a porous structure with a large specific surface area (increased from 2.36 up to 282 m(2) g(-1)) and a high pore volume (from 0.024 up to 0.184 cm(3) g(-1)). Methanol-toluene separation performance by the nickel-doped BTPA (Ni-BTPA) membranes was increased with increases in the nickel concentration. Ni-BTPA 0.50 showed separation performance that was superior to other types of membranes, along with a high-level of flux at 2.8 kg m(-2) h(-1) and a separation factor higher than 900 in a 10 wt % methanol feed solution at 50 degrees C. These results suggest that the balance between the microporosity induced by amine-nickel coordination and an excessive amount of nickel-ion facilitates high levels of flux and separation of methanol.