论文标题
电偏置的3D印刷石墨烯混合垫片在磁通增强和缩放电阻上的功效
Efficacy of Electrically-Polarized 3D Printed Graphene-blended Spacers on the Flux Enhancement and Scaling Resistance of Water Filtration Membranes
论文作者
论文摘要
在这项研究中，首次通过一种新型制造方法引入了电偏石石墨烯二旋酸（E-GRP）垫片，该方法由3D打印组成，然后在高压电场（1.5 kV/cm）下进行电偏振。与3D打印的非极化石墨烯 - 二基酸（GRP）间隔和polyacticac Accer（PLA）间隔物相比，在渗透驱动的过程（正向渗透系统）中测试了制造的E-GRP，以评估其在水通量，反向溶质通量和离子吸引力方面的性能。与采用GRP（20.5 +-2.3 LMH）或PLA（20.8 +-2.1 LMH）间隔器的系统相比，发达的E-GRP垫片的使用> 50％的水通量增强（32.4 +-2 LMH）。由于离子吸附在极化（E-GRP）间隔物上，因此水通量增加归因于整个膜上渗透压的增加。与GRP垫片相比，E-GRP垫片还阻碍了膜上的石膏缩放，这是由于石膏聚集和负电荷表面之间的静电作用的分散效应。通过观察其盐吸附特性（在3 M NaCl溶液中），E-GRP垫片的电偏振被证明保持> 100 h。
In this research, an electrically-polarized graphene-polylactic acid (E-GRP) spacer is introduced for the first time by a novel fabrication method, which consists of 3D printing followed by electrical polarization under a high voltage electric field (1.5 kV/cm). The fabricated E-GRP was tested in an osmotic-driven process (forward osmosis system) to evaluate its performance in terms of water flux, reverse solute flux, and ion attraction compared to a 3D printed non-polarized graphene-polylactic acid (GRP) spacer and a polylactic acid (PLA) spacer. The use of the developed E-GRP spacer showed > 50% water flux enhancement (32.4 +- 2 LMH) compared to the system employing the GRP (20.5 +- 2.3 LMH) or PLA (20.8 +- 2.1 LMH) spacer. This increased water flux was attributed to the increased osmotic pressure across the membrane due to the ions adsorbed on the polarized (E-GRP) spacer. The E-GRP spacer also retarded the gypsum scaling on the membrane compared to the GRP spacer due to the dispersion effect of electrostatic forces between the gypsum aggregation and negatively charged surfaces. The electric polarization of the E-GRP spacer was shown to be maintained for > 100 h by observing its salt adsorption properties (in a 3 M NaCl solution).
