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Heterostructured Bimetallic MOF-on-MOF Architectures on Amino-Functionalized Cellulose for Enhanced Catalytic Water Treatment

JOURNAL OF WATER PROCESS ENGINEERING(2024)

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Abstract
Modulating the electron transfer rate of Co species and preventing the aggregation of metal-organic framework (MOF) particles are crucial prerequisites for its catalytic performance. Here in this work, an effective strategy was proposed by incorporating MOF-on-MOF architecture into Co-MOFs species and grown on amino-functionalized carboxymethyl cellulose (CMC) substrate. The bimetallic structure with synergistic effect of multi-metallic centers (Co and Cu) accelerated the electron transfer circle of cobalt species and changed the advanced oxidation reaction route into the more reactive non-radical route. The MOFs species on the cellulose-based substrate was proved to be well dispersed and stabilized the active species, leading to good stability and recyclability of the catalyst. The designed catalyst demonstrated good treatment effectiveness for amphoteric pollutants, achieving the elimination of chromium (VI) oxyanions by adsorption and reduction conversion (60.1 mg/g capacity with 82 % reduction rate) and the complete exclusion of Rh B dye molecules by adsorption and oxidation degradation (149.0 mg/g capacity with 100 % degradation rate). This work paves the way for manipulating the structure of metallic catalysts to enhance their catalytic activity.
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Editor: Akeem Oladipo,MOF-on-MOF structure,Cellulose,Reduction,Advanced oxidation
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