Xu Rong, Liu Qian, Ren Xiuxiu, Lin Peng, Zhong Jing
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.
Membranes (Basel). 2020 Dec 3;10(12):392. doi: 10.3390/membranes10120392.
Microporous organosilica membranes based on 1,2-bis(triethoxylsilyl)ethane (BTESE) were fabricated via an acid-catalyzed sol-gel technique. In the preparation process, the calcination temperature plays a significant role in structural and surface properties of the organosilica networks. With an increase in calcination temperature, the surface hydrophilicity decreased due to the enhanced condensation of Si-OH groups in the networks. N adsorption results suggest that the pore structures of BTESE membranes was clearly dependent on the calcination temperature. The pore sizes of the membranes were quantitatively determined by using the Normalized Knudsen-based permeance (NKP) model. In pervaporation tests, the membranes with higher calcination temperatures showed higher salt rejections and lower water permeances, which was attributed to the changes in pore size and surface chemistry of pore walls. The BTESE membranes calcined at 200 °C exhibited superior hydrothermal stability in temperature cycles up to 70 °C and high reproducibility in concentration cycles with NaCl concentrations of 0.2-13 wt%, showing great promise for desalination applications of high-salinity water.
基于1,2 - 双（三乙氧基硅基）乙烷（BTESE）的微孔有机硅膜通过酸催化溶胶 - 凝胶技术制备。在制备过程中，煅烧温度对有机硅网络的结构和表面性质起着重要作用。随着煅烧温度的升高，由于网络中Si - OH基团缩合增强，表面亲水性降低。氮气吸附结果表明，BTESE膜的孔结构明显依赖于煅烧温度。通过使用基于归一化克努森渗透率（NKP）模型定量测定膜的孔径。在渗透蒸发测试中，煅烧温度较高的膜表现出较高的脱盐率和较低的透水率，这归因于孔径和孔壁表面化学性质的变化。在高达70°C的温度循环中，在200°C煅烧的BTESE膜表现出优异的水热稳定性，并且在NaCl浓度为0.2 - 13 wt％的浓度循环中具有高重现性，显示出在高盐度水脱盐应用中的巨大潜力。
