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Study of fabricating flexible organosilica membranes with high performance via flow-induced deposition method

Authors： LI Yanan1, LIAO Mingjia2，GONG Genghao1

Units： 1 State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China；2 Chongqing Vocational College of Chemical Engineering，Chongqing 401228

KeyWords： polysulfone support; flexible organosilica membranes; flow-induced deposition; organically bridged silica; vapor permeation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(6):27-34

Abstract：

Using 1,2-bis(triethoxysilyl)ethane(BTESE) as a single precursor, an organosilica layer with high perm-selectivity was successfully deposited onto a porous polymer substrate via scalable sol-gel flow-induced deposition method. The effect of pore sizes of supports and concentrations of BTESE sol for the morphology of BTESE layer and nanoscale hybrid organosilica networks were examined using SEM, ATR-FTIR and XPS. In addition, the layered hybrid membranes were applied to the vapor permeation dehydration of isopropanol–water (90/10 wt%) solutions at 105℃. We investigated the influence of pore sizes of supports and concentrations of BTESE sol for the formation of the organosilica layer that covered the porous polymeric supports. We found that the thickness of BTESE layer increased linearly with an increase in concentration of BTESE sols. The layered membrane demonstrated a water flux of 1.77 kg m−2h−1 and a separation factor of 1200 when using BTESE sol with concentration of 5 wt%, whose thickness was 500 nm. Also, different pore sizes of polymeric supports exerted on the formation of the BTESE layer along with the effect on membrane performance.

Funds：

天津市自然科学基金（18JCYBJC43300）；天津市科技计划项目（20ZYJDJC00100）；重庆市教育委员会科学技术研究基金（KJQN201904501）

AuthorIntro：

李亚楠（1995-），女，山东德州市人，硕士生，研究方向为柔性有机二氧化硅复合膜的制备及其应用，E-mail：naumlee@163.com

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