MoS2@MWCNTs with Rich Vacancy Defects for Effective Piezocatalytic Degradation of Norfloxacin via Innergenerated-H2O2: Enhanced Nonradical Pathway and Synergistic Mechanism with Radical Pathway
Source abstract
Abstract
Molybdenum disulfide (MoS 2 )-based materials for piezocatalysis are unsatisfactory due to their low actual piezoelectric coefficient and poor electrical conductivity. Herein, 1T/3R phase MoS 2 grown in situ on multiwalled carbon nanotubes (MWCNTs) was proposed. MoS 2 @MWCNTs exhibited the interwoven morphology of thin nanoflowers and tubes, and the piezoelectric response of MoS 2 @MWCNTs was 4.07 times higher than that of MoS 2 via piezoresponse force microscopy (PFM) characterization. MoS 2 @MWCNTs exhibited superior activity with a 91% degradation rate of norfloxacin (NOR) after actually working 24 min (as for rhodamine B, reached 100% within 18 min) by pulse-mode ultrasonic vibration-triggered piezocatalysis. It was found that piezocatalysis for removing pollutants was attributed to the synergistic effect of free radicals ( • OH and O 2 •– ) and nonfree radical ( 1 O 2, key role) pathways, together with the innergenerated-H 2 O 2 promoting the degradation rate. 1 O 2 can be generated by electron transfer and energy transfer pathways. The presence of oxygen vacancies (OVs) induced the transformation of O 2 to 1 O 2 by triplet energy transfer. The fast charge transfer in MoS 2 @MWCNTs heterostructure and the coexistence of sulfur vacancies and OVs enhanced charge carrier separation resulting in a prominent piezoelectric effect. This work opens up new avenues for the development of efficient piezocatalysts that can be utilized for environmental purification.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Environmental Science and Engineering, Shandong University, No.72 Binhai Road, Jimo District, Qingdao, Shandong 266237, PR China
Institute of Eco-Environmental Forensics, Shandong University, No.72 Binhai Road, Jimo District, Qingdao, Shandong 266237, PR China
801 Hydrogeological Engineering Geological Brigade, Shandong Geological and Mineral Exploration and Development Bureau, Jinnan, Shandong 250013, PR China
Funding
National Key Research and Development Program of China
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