Design of Sn-doped MoS₂ piezocatalyst for high-efficiency antibiotic degradation: mechanism and performance

Abstract

Harnessing renewable energy to decrease pollution is a significant area of investigation within environmental management. In this paper, tin-doped molybdenum disulfide (Sn-MoS₂) piezoelectric materials with excellent piezoelectric properties have been prepared. PFM and electrochemical test results show that Sn-MoS₂ has enhanced piezoelectric properties. The findings from UV-Vis diffuse reflectance and XPS valence band analysis indicate that the introduction of tin modifies the band gap of MoS₂, thereby facilitating electron flow within the material. In an ultrasonic environment, Sn-MoS₂ achieved a tetracycline removal efficiency of 98.3% in just 50 min, 1.51 times more effective than pure MoS₂. The EPR results revealed that hydroxyl (–OH) and superoxide radicals (–O₂⁻) significantly contribute to the breakdown of tetracycline (TC). In addition, the potential degradation mechanisms and pathways have been suggested. This research offers a viable approach for addressing waterborne organic contaminants and holds significant potential for wider applications.

Graphical abstract

Keywords

Molybdenum disulfide / Sn-doped / Miezoelectric catalysis / Tetracycline / Degradation mechanism

Highlight

	● Successfully prepared Sn-doped molybdenum disulfide piezoelectric material.
	● Studied the effect of Sn-doped on the piezoelectric properties of MoS2.
	● Under ultrasonic activation, Sn-MoS2 could degrade 98.3% of TC.
	● Discussed the degradation pathways of TC and toxicity assessment.

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