Layer-by-layer construction of graphene oxide (GO) framework composite membranes for highly efficient heavy metal removal
Layer-by-layer construction of graphene oxide (GO) framework composite membranes for highly efficient heavy metal removal
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DOI：
10.1016/j.memsci.2016.05.035
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发表时间：
2016-10
影响因子：
9.5
通讯作者：
Yu Zhang;Sui Zhang;Jie Gao;T. Chung
中科院分区：
文献类型：
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作者：
Yu Zhang;Sui Zhang;Jie Gao;T. Chung
在本研究中，通过逐层(LBL)方法在改性的Torlon®中空纤维支撑体上成功地沉积了超薄的氧化石墨烯(GO)骨架层，使复合膜具有优异的纳滤(NF)性能。为了从分子上设计GO骨架，首先用聚乙烯亚胺(HPEI)交联基质层，然后重复GO和乙二胺(EDA)沉积循环，然后用HPEI对其进行胺富集修饰。GO骨架层与Torlon®支撑体的结合，不仅可以有效地封闭孔径分布较窄的复合膜的缺陷，而且还可以减少传统整体式纳滤膜制备所需的聚合物消耗。GO/TORLON®复合膜对Pb2+、Ni2+和Zn2+的截留率高于95%，对水的渗透率为4.7%，−2 h−1bar−1。该膜还在150h的纳滤试验中表现出极好的长期性能稳定性。因此，新开发的膜在去除重金属方面具有很大的潜力。本研究为新一代二维纳滤膜的制备提供了有益的启示。
In this study, an ultrathin graphene oxide (GO) framework layer was successfully deposited on a modified Torlon®hollow fiber support via a layer-by-layer (LbL) approach, enabling the composite membrane with superior nanofiltration (NF) performance. To molecularly design the GO framework, the substrate layer was firstly cross-linked with polyethylenimine (HPEI), followed by repeating the GO and ethylenediamine (EDA) deposition cycles and then an amine-enrichment modification by HPEI. The combination of the GO framework layer and the Torlon®support can not only effectively seal the defects of the composite membrane with a narrow pore size distribution but also reduce the polymer consumption for the fabrication of traditional integrally skinned NF membranes. The GO/Torlon®composite membrane has rejections higher than 95% towards Pb2+, Ni2+, and Zn2+with a superior water permeability of 4.7 L m−2h−1bar−1. The membrane also exhibits excellent long-term performance stability during a 150-h NF test. Thus, the newly developed membrane has great potential for heavy metal removal. This study may provide useful insights on the fabrication of new generation 2-dimensional (2D) NF membranes.