Tuning interlayer spacing of graphene oxide membranes with enhanced desalination performance
Tuning interlayer spacing of graphene oxide membranes with enhanced desalination performance
复制标题
调整氧化石墨烯膜的层间距以增强海水淡化性能
DOI：
10.1016/j.desal.2019.03.009
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发表时间：
2019-06-15
期刊：
影响因子：
9.9
通讯作者：
Huang, Aisheng
中科院分区：
文献类型：
--
作者：
Qian, Yunlong;Zhang, Xiaoling;Huang, Aisheng
选择1，2-二氨基乙烷(A2)、1，3-二氨基丙烷(A3)、1，4-二氨基丁烷(A4)、1，5-二氨基戊烷(A5)、1，6-二氨基己烷(A6)、1，7-二氨基庚烷(A7)和1，8-二氨基辛烷(A8)等一系列不同动力学直径的脂肪族末端二胺作为氧化石墨烯(GO)的内嵌分子，制备了二胺修饰氧化石墨烯纳米片(Ax-GO)。通过真空过滤的方法，在聚多巴胺(PDA)修饰的α-Al_2O_3载体上沉积了层间距可调的二胺修饰的Ax-GO膜。考察了Ax-GO膜对渗透汽化海水淡化的分离性能。结果表明，Ax-GO膜的水通量随Ax-GO层间距的增大而增大。令人印象深刻的是，对于3.5wt%的海水淡化，A4-GO膜表现出最好的性能，水通量为19.7 kg.m(-2).h(-1)，在90℃时离子截留率为99.9%。此外，A4-GO膜对海水淡化具有很高的稳定性，在75℃下，海水淡化性能保持不变，最高可达168小时。
A series of aliphatic terminal diamines with different kinetic diameter length, including 1,2-diaminoethane (A2), 1,3-diaminopropane (A3), 1,4-diaminobutane (A4), 1,5-diaminopentane (A5), 1,6-diaminlhexane (A6), 1,7-diaminoheptane (A7), and 1,8-diaminooctane (A8), were selected as built-in molecules of graphene oxide (GO) to fabricate diamine modified graphene oxide nanosheets (Ax-GO). Through vacuum filtration method, diamine modified Ax-GO membranes with tunable interlayer spacing were deposited on the polydopamine (PDA) modified alpha-Al2O3 supports. The separation performances of the Ax-GO membranes were evaluated for seawater desalination by pervaporation. It is found that the water fluxes of the Ax-GO membranes increase with the enhancement of the interlayer spacing of the Ax-GO. Impressively, A4-GO membrane displays the best performance with water flux of 19.7 kg.m(-2).h(-1) and ion rejection of 99.9% at 90 degrees C for desalination of 3.5 wt% seawater. Further, A4-GO membrane shows high stability for seawater desalination, and the desalination performance keeps unchanged up to 168 h at 75 degrees C.