Controlled Synthesis of Perforated Oxide Nanosheets with High Density Nanopores Showing Superior Water Purification Performance
Controlled Synthesis of Perforated Oxide Nanosheets with High Density Nanopores Showing Superior Water Purification Performance
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DOI：
10.1021/acsami.2c01474
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发表时间：
2022-04-18
影响因子：
9.5
通讯作者：
Cai, Xingke
中科院分区：
文献类型：
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作者：
Li, Yongtao;Gutierrez Moreno, Jose Julio;Cai, Xingke
已经开发了一种用于在单层二维（2D）金属氧化物上以高面积密度产生真正的纳米孔的方法。利用氢碘酸的强还原能力，可以将二维氧化物纳米片中的活性金属离子（例如Fe-III和Co-III）还原为二价电荷态（2+）。可以调节从骨架中选择性去除FeO 2和CoO 2金属氧化物单元以产生1-4 nm范围内的孔。通过监测氧化还原反应动力学，孔面积密度也可以从近似0.9 × 10（4）μ m（-2）调整到近似3.3 × 10（5）μ m（-2）。这种方法的普遍性，以产生更小的孔和更高的面积密度比以前报道的已被证明在不同的氧化物纳米片。为了证明其潜在的应用，超小的金属有机骨架颗粒内的多孔二氧化钛纳米片的孔生长。优化后的杂化膜对亚甲基蓝（MB）的截留率接近100%。该膜的透水性能达到4260 L m（-2）h（-1）bar（-1），是已报道的具有良好MB截留性能的二维膜的1-3个数量级。
A method for creating genuine nanopores in high area density on monolayer two-dimensional (2D) metallic oxides has been developed. By use of the strong reduction capability of hydroiodic acid, active metal ions, such as Fe-III and Co-III, in 2D oxide nanosheets can be reduced to a divalent charge state (2+). The selective removal of FeO2 and CoO2 metal oxide units from the framework can be tuned to produce pores in a range of 1-4 nm. By monitoring of the redox reaction kinetics, the pore area density can be also tuned from similar to 0.9 x 10(4) to similar to 3.3 x 10(5) mu m(-2). The universality of this method to produce much smaller pores and higher area density than the previously reported ones has been proven in different oxide nanosheets. To demonstrate their potential applications, ultrasmall metal organic framework particles were grown inside the pores of perforated titania oxide nanosheets. The optimized hybrid film showed similar to 100% rejection of methylene blue (MB) from the water. Its water permeance reached 4260 L m(-2) h(-1) bar(-1), which is 1-3 orders of that for reported 2D membranes with good MB rejections.