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Removal of arsenic(III) from water by 2D zeolitic imidazolate framework-67 nanosheets
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-10-09 , DOI: 10.1039/d0en00851f Pin Zhao 1, 2, 3, 4, 5 , Meipeng Jian 6, 7, 8, 9 , Rongming Xu 10, 11, 12, 13 , Qi Zhang 10, 11, 12, 13 , Chao Xiang 1, 2, 3, 4, 5 , Ruiping Liu 1, 2, 3, 4, 5 , Xiwang Zhang 6, 7, 8, 9 , Huijuan Liu 1, 2, 3, 4, 5
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-10-09 , DOI: 10.1039/d0en00851f Pin Zhao 1, 2, 3, 4, 5 , Meipeng Jian 6, 7, 8, 9 , Rongming Xu 10, 11, 12, 13 , Qi Zhang 10, 11, 12, 13 , Chao Xiang 1, 2, 3, 4, 5 , Ruiping Liu 1, 2, 3, 4, 5 , Xiwang Zhang 6, 7, 8, 9 , Huijuan Liu 1, 2, 3, 4, 5
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Ultrathin two-dimensional (2D) porous materials, which can efficiently capture harmful pollutants from aqueous solutions are highly desired yet scarcely reported. Herein, 2D zeolitic imidazolate framework-67 porous nanosheets (ZIF-67-NS) were first applied as a promising adsorbent for arsenic(III) removal from water. An ultrathin structure was observed for the as-prepared ZIF-67-NS with an average thickness of 1.3 nm. The resulting ZIF-67-NS shows outstanding water stability in alkaline conditions. Owing to the unique dimensionality, ZIF-67-NS exhibited a significantly higher adsorption capacity (516 mg g−1) and faster uptake kinetics (2 h) toward As(III) than its 3D bulk-type counterpart (ZIF-67-NB). The superior adsorption performance in the ultrathin ZIF-67-NS is attributed to the coordinatively unsaturated Co(II) atoms, which are open sites dominating adsorption, as evidenced by X-ray photoelectron and Fourier transform infrared spectroscopy. On the other hand, the phase transformation in ZIF-67-NB was observed from the 3D bulk structure to the 2D layered structure during the As(III) absorption. Lastly, ZIF-67-NS can be efficiently regenerated with few losses in the adsorption capacity after 3 cycles. Overall, this work represents a practical case of As(III) removal by a 2D crystalline porous material and demonstrates its potential for the development of 2D nanomaterial adsorbents.
中文翻译：
二维沸石咪唑盐骨架67纳米片从水中去除砷（III）
人们非常希望能够从水溶液中有效捕获有害污染物的超薄二维（2D）多孔材料，但鲜有报道。在此，首先将2D沸石咪唑盐骨架67多孔纳米片（ZIF-67-NS）用作从水中去除砷（III）的有前途的吸附剂。对于制备的ZIF-67-NS，观察到超薄结构，平均厚度为1.3nm。所得的ZIF-67-NS在碱性条件下显示出出色的水稳定性。由于独特的尺寸，ZIF-67-NS表现出明显更高的吸附容量（516 mg g -1）和更快的对As（III）的吸收动力学（2 h）。），而不是其3D体积类型对应物（ZIF-67-NB）。在超薄ZIF-67-NS中优异的吸附性能归因于配位不饱和的Co（II）原子，它们是支配吸附的开放位点，如X射线光电子和傅里叶变换红外光谱所证明。另一方面，在吸收As（III）的过程中，观察到ZIF-67-NB中的相变从3D本体结构向2D层状结构。最后，经过3个循环，ZIF-67-NS可以高效地再生，而吸附能力几乎没有损失。总的来说，这项工作代表了一种利用2D结晶多孔材料去除As（III）的实际案例，并证明了其开发2D纳米材料吸附剂的潜力。
更新日期：2020-11-03
中文翻译：
二维沸石咪唑盐骨架67纳米片从水中去除砷（III）
人们非常希望能够从水溶液中有效捕获有害污染物的超薄二维（2D）多孔材料，但鲜有报道。在此，首先将2D沸石咪唑盐骨架67多孔纳米片（ZIF-67-NS）用作从水中去除砷（III）的有前途的吸附剂。对于制备的ZIF-67-NS，观察到超薄结构，平均厚度为1.3nm。所得的ZIF-67-NS在碱性条件下显示出出色的水稳定性。由于独特的尺寸，ZIF-67-NS表现出明显更高的吸附容量（516 mg g -1）和更快的对As（III）的吸收动力学（2 h）。），而不是其3D体积类型对应物（ZIF-67-NB）。在超薄ZIF-67-NS中优异的吸附性能归因于配位不饱和的Co（II）原子，它们是支配吸附的开放位点，如X射线光电子和傅里叶变换红外光谱所证明。另一方面，在吸收As（III）的过程中，观察到ZIF-67-NB中的相变从3D本体结构向2D层状结构。最后，经过3个循环，ZIF-67-NS可以高效地再生，而吸附能力几乎没有损失。总的来说，这项工作代表了一种利用2D结晶多孔材料去除As（III）的实际案例，并证明了其开发2D纳米材料吸附剂的潜力。
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