Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 250, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.117178
Keywords
Sonophotocatalytic activity; NixMg4-xS4; MXene; Bisphenol A
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Funding
- Department of Science and Technology (DST) - Science and Engineering Research Board (SERB), New Delhi, India [EMR/2016/002564]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF2018R1A6A1A03024962]
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A novel 2D Ti3C2Tx MXene (MX) co-catalyst and NixMg4-xS4 (NMS) nanocomposite (NMS@MX ) was simply prepared through a hydrothermal method and utilized as a sonophotocatalyst for the degradation of bisphenol A (BPA). Because the remediation of wastewater containing endocrine-disrupting compounds is an important issue in environmental fields, BPA was selected as the main organic pollutant to clarify the sonophotocatalytic activity of NMS@MX in this study. We confirmed the successful synthesis of NMS@MX through Fourier-transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses. The mineralization of BPA via sonophotocatalysis with NMS@MX was much faster and more efficient than by applying photolysis and sonolysis, separately. The NMS@MX sonophotocatalyst showed high sonophotocatalytic activity based on similar to 92% degradation of BPA within 60 min using both visible light and ultrasonication. This outcome could have resulted from the mitigation of the photo-corrosion of metal sulfides through heterojunction structures combined with the highly conducive MX co-catalyst. Furthermore, NMS@MX showed excellent sonophotostability over four consecutive cycles for the degradation of BPA with negligible loss of sonophotocatalytic activity. Finally, we proposed the sonophotocatalytic degradation pathway of BPA in the Sono/Vis/MNS@MX system (Sono = sonolysis; Vis = photolysis).
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