Constructing an S-scheme MnFe2O4/ZnIn2S4 heterojunction with photothermal effect to achieve efficient degradation of tetracycline and 2,4,6-trinitrotoluene

In this work, the S-scheme MnFe2O4/ZnIn2S4 (MFO/ZIS) heterostructure was prepared by hydrothermal method, which can degrade tetracycline (TC) and 2,4,6-trinitrotoluene (TNT) efficiently. Under simulated sunlight irradiation, 88.9 % of TC can be degraded within 75 minutes, and 82.7 % of TNT can be degraded within 120 minutes. The photocurrent response of 3 %MFO/ZIS (0.45 mu A cm-(2)) surpassed that of ZIS (0.15 mu A cm(-2)) and MFO (0.08 mu A cm(-2)). This is mainly due to the synergistic effect of the S-scheme electron transport pathway and the photothermal effect in MFO/ZIS, which improves its utilization rate of photogenerated electrons. After being used four times, 3 %MFO/ZIS can still degrade 80.2 % of TC, showing excellent stability. In addition, the TC degradation process was analyzed and the low toxicity of TC after degradation was confirmed by LC-MS, ECOSAR and experiments of cultivating mung bean sprouts, demonstrating the potential application value of MFO/ZIS heterojunction in the wastewater treatment field.