Nanosheet‐templated graphene oxide membranes for fast molecule separation
Nanosheet‐templated graphene oxide membranes for fast molecule separation
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用于快速分子分离的纳米片模板氧化石墨烯膜
DOI：
10.1002/aic.17818
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发表时间：
2022-06
期刊：
影响因子：
3.7
通讯作者：
Qiugen Zhang
中科院分区：
文献类型：
--
作者：
Zhen Lin;Chuan Hu;Qinglin Liu;Qiugen Zhang
层间距可控的插层膜是一种高效的分子快速分离膜。在这项工作中，我们展示了一种通用的策略，在层状氧化石墨烯（GO）膜中创建纳米片模板水通道。1.2 nm厚的氢氧化镍纳米片作为牺牲的嵌入剂提供了控制d-间距的机会。所得膜具有可控的通道，并表现出比未插层膜高六倍以上的水渗透性。880 nm厚的纳米片模板化GO（NST-GO）膜具有约1.14 nm的精确d间距，并显示出120.3 L m-2 h-1 bar-1的高水渗透性和良好的分子分离性能，反映出对较大染料的高截留率（对赤藓红B [EB]为90.1%），而对较小染料的低截留率（对亚甲基蓝[MB]为58.3%）。此外，这种插层和牺牲纳米片的策略在控制层状膜的d-间距方面比传统的插层具有更高的潜力。
Intercalated laminar membrane with controllable interlayer spacing (d-spacing) is one of the most effective membranes for fast molecule separation. In this work, we demonstrate a versatile strategy to create nanosheet-templated water channels in laminar graphene oxide (GO) membranes. The 1.2 nm-thick nickel hydroxide nanosheets as sacrificed intercalators provide a chance to control the d-spacing. The resultant membranes have controllable channels and exhibit over six times higher water permeance than the unintercalated membrane. The 880 nm-thick nanosheet-templated GO (NST-GO) membrane has accurate d-spacing of about 1.14 nm and shows high water permeance of 120.3 L m−2 h−1 bar−1 and good molecule separation property, reflecting in high rejection for larger dyes (90.1% for erythrosine B [EB), while low rejection for smaller dyes (58.3% for methylene blue [MB). Furthermore, this strategy of intercalating and sacrificing nanosheets has higher potential than traditional intercalation in controlling d-spacing of laminar membranes.