Facile Fabrication of Atom-Level Heterojunction 2d Mosse Nanoplates Exhibit Excellent Performance in Photoelectrochemistry and Photocatalytic Levofloxacin Degradation
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Titel:
Facile Fabrication of Atom-Level Heterojunction 2d Mosse Nanoplates Exhibit Excellent Performance in Photoelectrochemistry and Photocatalytic Levofloxacin Degradation
Beschreibung:
Designing highly efficient photocatalysts for the degradation of overused levofloxacin (LEV) antibiotics is a significant work as well as full of challenges. Herein, novel atom-level heterojunction 2D MoSSe nanoplates (MSS) with tunable S:Se molar ratio were obtained by hydrothermal synthesis. Results indicated lattice constants of these MSS catalysts were between the MoS 2 and MoSe 2 , and their surface energy increased due to the combination of the two types of lattice structures. Further analysis revealed there were internal electric fields in MSS catalysts, which resulted from the centers of the positive charge and the negative charge did not coincide. Thanks to the internal electric field, MSS catalysts had lower internal resistances, which was conducive to the transmission of internal carriers, and eventually could enhance the photoelectrochemical activity. The photocatalytic LEV degradation rate ( k ) of the MSS1 was 7.5 and 8.1 times more than that of MoS 2 and MoSe 2 . The photocurrent density of MSS1 and MSS4 was 3.5 and 18.2 times more than that of MoS 2 . In addition, the conduction band position of MSS1 was higher than O 2 /•O 2 − and MoS 2 from band structure analysis, which could generate •O 2 − for LEV degradation. Moreover, Electron Spin Resonance (ESR) analysis further revealed main active species in photocatalytic LEV degradation was photo-generated •O 2 – and •OH that generated from the transformation of the •O 2 − . Finally, a possible photocatalytic mechanism for LEV degradation was proposed accordingly. These results fully confirmed that MoSSe could completely replace MoS 2 and MoSe 2 and displayed the large potential of the ternary compound