Construction of Mn0.3Cd0.7S/FeNi8-LDH S-scheme heterojunction for enhanced photocatalytic degradation of tetracycline under visible light
The widespread application of antibiotics, such as tetracycline (TC), has led to severe environmental problems. Herein, the rod-like Mn 0.3 Cd 0.7 S (MCS) coupled with flower-like FeNi 8 -LDH self-assembled from nanosheets S-scheme heterojunction is successfully constructed by a simple physical ultrasonic-assisted combined with a grinding method. The optimized MCS/30FeNi 8 -LDH heterojunction exhibits excellent photocatalytic degradation of TC under visible light with a removal rate of 72.5 % within 30 min along with excellent cycling stability, which enhanced 14.5 and 1.68 times compared to those of pristine FeNi 8 -LDH and MCS. The correlation between S-scheme heterojunction and photocatalysis performance clarify the rapidly transfer pathway of photogenerated carriers between MCS and FeNi 8 -LDH. The trapping experiment confirms •O 2 - and h + are the primary active species, with h + playing a dominant role in the degradation process. The enhanced photocatalytic degradation performance can be attributed to the formation of S-scheme heterojunction with well-matched band alignment, which remains the powerful reduction capability of generated electrons of FeNi 8 -LDH and more robust oxidation capability of photogenerated holes of MCS. This work not only provides a potential solution for photocatalysis degrading TC, but also expands the S-scheme heterojunction constructed strategy to the realm of energy storage and conversion .
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