Facilitating charge separation and migration of conjugated microporous polymers via skeleton isomerism engineering for photocatalytic reduction of uranium (VI)

[Display omitted] •Isomeric D-A CMPs are innovatively applied to photocatalytic reduction of UVI.•The PQ-TPM has larger dipole moment, inducing a giant built-in electric field.•The highly conjugated PQ-TPM framework shows more efficient carrier separation and migration efficiency.•The PQ-TPM achieve...

Full description

Saved in:
Bibliographic Details
Published in:Separation and purification technology 2024-04, Vol.334, p.126121, Article 126121
Main Authors: Chen, Yi-Ru, Wang, Xiu, Fan, Xiao-Yi, Wei, Hao-Feng, Jiang, Hong-Wei, Li, Yibao, Cui, Wei-Rong
Format: Article
Language:English
Subjects:
Adsorption
Conjugated microporous polymers
Isomeric
Photocatalysis
Uranium
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •Isomeric D-A CMPs are innovatively applied to photocatalytic reduction of UVI.•The PQ-TPM has larger dipole moment, inducing a giant built-in electric field.•The highly conjugated PQ-TPM framework shows more efficient carrier separation and migration efficiency.•The PQ-TPM achieves 80 % at pH 2 photocatalytic UVI reduction efficiency within 180 min. Photoreduction of highly toxic and high-mobility UVI into insoluble UIV via conjugated microporous polymers (CMPs) is an effective way to extract uranium from highly acidic wastewater. Nevertheless, undesirable charge separation and migration, as well as rapid reverse charge recombination resulted in unsatisfactory photocatalytic activity of most CMPs. Herein, a pair of D-A CMPs for uranium photocatalytic reduction was developed by modulating skeleton isomerism through isomeric building blocks, named PQ-TPM (with phenanthrenequinone skeleton) and AQ-TPM (with anthraquinone skeleton). Interestingly, compared with anthraquinone skeleton CMP, phenanthrenequinone skeleton CMP can inhibit reverse charge recombination while promoting charge separation and migration due to its stronger built-in electric field and larger dipole moment. Therefore, PQ-TPM achieves an ultra-high photocatalytic UVI removal efficiency of 80.0 % within 180 min visible-light irradiation even under strongly acidic conditions (pH = 2), which was superior to AQ-TPM (30.0 %) and most reported CMPs. This study provides an unconventional concept and an emerging strategy for exploring outstanding CMPs photocatalysts for efficient processing of radionuclides.
ISSN:1383-5866
DOI:10.1016/j.seppur.2023.126121