Photocatalytic degradation of tetracycline wastewater through heterojunction based on 2D rhombic ZrMo2O8 nanosheet and nano-TiO2
Source abstract
Abstract
Herein, a novel composite heterojunction photocatalyst based on 2D rhombic ZrMo2O8 nanosheet and nano-TiO2 was successfully constructed, synthesized, and characterized, and it demonstrated superior photocatalytic activity to degrade tetracycline wastewater. The composite photocatalyst exhibited prominent light absorption ability, remarkable stability, and recyclability, and the optimal ratio of Ti/Zr was 1/0.35. As proved by detection of DMPO-·OH, DMPO-O2−, and scavenging tests, the active species of ·OH and ·O2− played a major role in the degradation of tetracycline. The composite of TiO2 and ZrMo2O8 could reduce the resistance of charge transfer and significantly decrease the recombination possibility of photo-induced electrons and holes. DFT calculation revealed that, when ZrMo2O8 (p-type semiconductor) and TiO2 (n-type) meet with each other, electrons and holes would be transferred and achieved a unified Fermi level between them. Simultaneously, an internal electric field would be formed at the contact interface, and it promoted the transformation of electrons and prevented the propagation of holes in the same direction when excited by UV light. That achieved the effective separation of photo-generated electrons and holes and contributed to the excellent photocatalytic performance for degrading tetracycline. This work not only provides a new approach to construct the composite heterojunction photocatalyst, but also demonstrates the possibility of utilizing binary nanocomposites for enhanced photocatalytic degradation of antibiotic wastewater.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · Covalent Organic Framework Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (72)
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