Constructing an S-Scheme Mnfe2o4/Znin2s4 Heterojunction with Photothermal Effect to Achieve Efficient Degradation of Tetracycline And 2,4,6-Trinitrotoluene

Abstract

In this paper, 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. This is mainly due to the synergistic effect of S-scheme electron transport pathway and photothermal effect in MFO/ZIS, which improves its photocatalytic performance. In addition, through LC-MS, ECOSAR and experiments of cultivating mung bean sprouts, the intermediate products in the TC degradation process and the ecological risks in the degradation process were analyzed. The results showed that the toxicity of TC was greatly reduced after degradation, which further confirmed the potential application value of MFO/ZIS heterojunction in the wastewater treatment field. This study provides a new idea for photocatalytic degradation of wastewater.

Keywords: photothermal, MnFe2O4, ZnIn2S4, 2, 4, 6-trinitrotoluene, tetracycline, S-scheme heterojunction