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900 results on '"Qiu, Jian‐Ding"'

48. In Situ Electrochemical Interfacial Polymerization for Covalent Organic Frameworks with Tunable Electrochromism.

Author

Wang, Ying‐Ao, Wu, Qiong, Wang, Xun, Jiang, Min, Zhang, Rui, Chen, Xiao‐Juan, Liang, Ru‐Ping, and Qiu, Jian‐Ding

Subjects
STERIC hindrance, ELECTROCHROMIC effect, FUNCTIONAL groups, ELECTROSYNTHESIS, POLYMERIZATION
Abstract

A rapid in situ synthesis of electrochromic covalent organic frameworks (EC‐COFs) was proposed by using green electrochemical interface polymerization of N,N,N',N'‐tetrakis(4‐aminophenyl)‐1,4‐benzenediamine (TPDA) and 2,5‐dihydroxyterephthalaldehyde (DHBD). The synthetized TPDA‐DHBD films exhibit stable polymorphic color variations under different applied potentials, which can be attributed to the redox state changes of bis(triphenylamine) and imine electroactive functional groups within the COFs skeleton. TPDA‐DHBD represents markedly different electrochromisms from red to cyan due to the steric hindrance effect caused by the presence of UO22+, demonstrating the unique tunability of COFs materials. This work offers a new feasible idea for rapid EC‐COFs synthesis and tunable EC‐COFs realization. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Rational Designed Metal–Organic Framework with Nanocavity Traps for Selectively Recognizing and Separating of Radioactive Thorium in Rare Earth Wastewater.

Author

Song, An‐Min, Yang, Meng‐Jie, Wu, Zhi, Yang, Qing, Lin, Bin, Liang, Ru‐Ping, and Qiu, Jian‐Ding

Subjects
MINE waste, RADIOACTIVE substances, SOLID waste, BINDING energy, MINES & mineral resources, THORIUM
Abstract

Facing the complex coexistence of various metal ions in wastewater and mineral resources, metal–organic frameworks (MOFs) with diverse functionalities and tunable pores are poised to serve as distinctive solutions for efficiently recognizing and selectively separating radioactive thorium (Th(IV)). Herein, a fluorescent MOF (DBT‐DHTA‐Cd) with unique thorium nanocavity traps is rationally designed by using two rigid ligands, including azole and hydroxyl groups, respectively. Notably, the synergistic effect of the appropriate pore size and dense hydroxyl···N nanocavity traps in DBT‐DHTA‐Cd results in selective capture of Th(IV), arising from the high charge density of nano‐trap and extremely low binding energy (Eads = −602.7 KJ mol−1). The fast adsorption kinetics (30 min) and rapid fluorescence response (1 min) of DBT‐DHTA‐Cd toward Th(IV) are attributed to the stronger electron holding capacity of the d and f orbitals belonged to Th(IV), making it more prone to accepting electrons transferred from the N/O active sites in the nano‐trap. As a verification test, tailing breakthrough experiments confirm that DBT‐DHTA‐Cd can efficiently purify Th(IV) from monazite mining solid waste in one step. This work provides profound insights into relationship between structure and property of MOFs and has valuable guidance for designing materials in the radioactive purification field. [ABSTRACT FROM AUTHOR]

Published
2024
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