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158 results on '"Cui, Wei-rong"'

41. A novel 3D sp2 carbon-linked covalent organic framework as a platform for efficient electro-extraction of uranium.

Author

Zhang, Cheng-Rong, Qi, Jia-Xin, Cui, Wei-Rong, Chen, Xiao-Juan, Liu, Xin, Yi, Shun-Mo, Niu, Cheng-Peng, Liang, Ru-Ping, and Qiu, Jian-Ding

Abstract

Extracting uranium from seawater offers opportunities for sustainable nuclear fuel supply, but the task is quite challenging due to the low uranium concentration (∼3 ppb) in seawater. Here, based on the Knoevenagel condensation reaction of aldehyde and acetonitrile groups, a novel stable sp2 carbon-linked three-dimensional covalent organic framework (3D COF), TFPM-PDAN-AO was prepared as a porous platform for uranium extraction from seawater. The TFPM-PDAN-AO designed with regular 3D pore channel of 7.12 Å provides a specific channel for uranyl diffusion, which exhibits high selectivity and fast kinetics for uranium adsorption. Meanwhile, the superior stability and optoelectronic properties enable it an excellent porous platform for uranium electroextraction. By applying alternating voltages between −5 and 0 V, uranyl ions can rapidly migrate and enrich into the porous structure of TFPM-PDAN-AO, then inducing the electrodeposition of uranium compounds to form the charge neutral species (Na2O(UO3H2O)x) with an unprecedentedly high adsorption capacity of 4,685 mg g−1. This work not only expands the application prospects of functionalized 3D COFs, but also provides a technical support for the electrodeposition adsorption of uranium from seawater. [ABSTRACT FROM AUTHOR]

Published
2023
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42. An ionic vinylene-linked three-dimensional covalent organic framework for selective and efficient trapping of ReO4− or 99TcO4−.

Author

Zhang, Cheng-Rong, Cui, Wei-Rong, Yi, Shun-Mo, Niu, Cheng-Peng, Liang, Ru-Ping, Qi, Jia-Xin, Chen, Xiao-Juan, Jiang, Wei, Liu, Xin, Luo, Qiu-Xia, and Qiu, Jian-Ding

Subjects
CARBON-carbon bonds, CHEMICAL stability, DOUBLE bonds, ALDOL condensation, ALKENES, TRIAZINES
Abstract

The synthesis of ionic olefin linked three-dimensional covalent organic frameworks (3D COFs) is greatly challenging given the hardness of the formation of stable carbon-carbon double bonds (–C = C–). Herein, we report a general strategy for designing porous positively charged sp2 carbon-linked 3D COFs through the Aldol condensation promoted by quaternization. The obtained 3D COFs, namely TFPM-PZI and TAPM-PZI, showed impressive chemical stability. Furthermore, the positively charged frameworks with regular porosity endow 3D ionic COFs with selective capture radioactive ReO4−/TcO4− and great removal efficiency in simulated Hanford waste. This research not only broadens the category of 3D COFs but also promotes the application of COFs as efficient functional materials. The synthesis of ionic olefin linked threedimensional covalent organic frameworks (3D COFs) is challenging because of the difficulties in forming stable carbon-carbon double bonds. Here, the authors report a general synthesis of an ionic sp2 carbon linked COFs and demonstrate selective capture of ReO4− ions. [ABSTRACT FROM AUTHOR]

Published
2022
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50. A novel 3D sp2carbon-linked covalent organic framework as a platform for efficient electro-extraction of uranium

Author

Zhang, Cheng-Rong, Qi, Jia-Xin, Cui, Wei-Rong, Chen, Xiao-Juan, Liu, Xin, Yi, Shun-Mo, Niu, Cheng-Peng, Liang, Ru-Ping, and Qiu, Jian-Ding

Abstract

Extracting uranium from seawater offers opportunities for sustainable nuclear fuel supply, but the task is quite challenging due to the low uranium concentration (∼3 ppb) in seawater. Here, based on the Knoevenagel condensation reaction of aldehyde and acetonitrile groups, a novel stable sp2carbon-linked three-dimensional covalent organic framework (3D COF), TFPM-PDAN-AO was prepared as a porous platform for uranium extraction from seawater. The TFPM-PDAN-AO designed with regular 3D pore channel of 7.12 Å provides a specific channel for uranyl diffusion, which exhibits high selectivity and fast kinetics for uranium adsorption. Meanwhile, the superior stability and optoelectronic properties enable it an excellent porous platform for uranium electroextraction. By applying alternating voltages between −5 and 0 V, uranyl ions can rapidly migrate and enrich into the porous structure of TFPM-PDAN-AO, then inducing the electrodeposition of uranium compounds to form the charge neutral species (Na2O(UO3H2O)x) with an unprecedentedly high adsorption capacity of 4,685 mg g−1. This work not only expands the application prospects of functionalized 3D COFs, but also provides a technical support for the electrodeposition adsorption of uranium from seawater.

Published
2023
Full Text
View/download PDF

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