Accelerated spraying-assisted layer by layer assembly of polyethyleneimine/titania nanosheet on thin film composite membrane for reverse osmosis desalination
Accelerated spraying-assisted layer by layer assembly of polyethyleneimine/titania nanosheet on thin film composite membrane for reverse osmosis desalination
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DOI：
10.1016/j.desal.2022.115645
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发表时间：
2022-02-22
期刊：
影响因子：
9.9
通讯作者：
Zulhairum, Abdul Karim
中科院分区：
文献类型：
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作者：
Ahmad, Nor Akalili;Goh, Pei Sean;Zulhairum, Abdul Karim
逐层沉积（LbL）是一种简单且通用的制备复合膜的多层膜的技术，但是传统的浸渍辅助LbL沉积是耗时的。本研究采用基于喷雾技术的加速LbL组装体对反渗透薄膜复合膜进行表面改性。采用喷雾和浸渍辅助LbL沉积技术，通过静电相互作用在TFC膜上形成TiO 2纳米片（TNS）和聚乙烯亚胺（PEI）交替层.考察了膜的表面电荷、亲水性、粗糙度、离子交联和形貌的变化。与TFC膜相比，具有1个PEI/TNS双层的喷涂TFC膜（1 PEI/TNSSC-TFC）实现了最高的水渗透率，为1.39 L·m（-2）·h（-1）·bar（-1）。与具有相同PEI/TNS双层（1 PEI/TNSDC-TFC）的浸涂膜相比，其水渗透性也实现了19.42%的增加，盐截留率为97%。1 PEI/TNSSC-TFC膜对牛血清白蛋白（BSA）和海藻酸钠（NaAlg）具有良好的抗污染性能，物理清洗后透过液回收率达100%。这项工作证明了喷涂技术的可行性方面的时间效率和精确控制纳米粒子沉积在表面膜改性。
Layer by layer (LbL) is a simple and versatile technique for the preparation of an ultrathin layer of composite membrane but the conventional dip-assisted LbL deposition is time consuming. In this study, an accelerated LbL assembly based on spray-on technique was successfully adopted to modify the surface of reverse osmosis (RO) thin film composite (TFC) membrane. The alternate layers of titania nanosheets (TNS) and polyethyleneimine (PEI) were formed on TFC membrane via electrostatic interaction using both spray and dip-assisted LbL depo-sition techniques. The membrane was investigated in terms of the changes of surface charge, hydrophilicity, roughness, ionic crosslinking and morphology. The spray-coated TFC membrane with 1 bilayer of PEI/TNS (1PEI/TNSSC-TFC) achieved the highest water permeability of 1.39 L.m(-2).h(-1).bar(-1) compared to that of TFC membrane. It also achieved 19.42% increment in the water permeability compared to the dip-coated membrane with the same bilayer of PEI/TNS (1PEI/TNSDC-TFC) with salt rejection of 97%. 1PEI/TNSSC-TFC membrane exhibited excellent anti fouling property towards bovine serum albumin (BSA) and sodium alginate (NaAlg) with 100% of permeate recovery upon physical cleaning. This work demonstrates the feasibility of spray-coated technique in terms of the time effectiveness and the precise control of nanoparticles deposition during the surface membrane modification.