Abstract
To perfect the photocatalytic performance of Fe3S4 under visible light irradiation using tetracycline hydrochloride (TCH) as a target contaminant, magnetic Fe3S4/g-C3N4 composites with a visible light response were synthesized by a one-step hydrothermal method. The effects of varying quality ratios, temperatures, pH value, and H2O2 concentrations on photocatalysis was investigated, and the composites were characterized by XRD, FTIR, XPS, SEM, etc. The results show that the highest photo-Fenton catalytic efficiency is obtained for a composite with a Fe3S4 to g-C3N4 quality ratio of is 1:0.75 (Fe1C0.75). More than 97.5% of TCH is removed by Fe3S4/g-C3N4/H2O2 within 60 min under visible light irradiation and near-neutral conditions (pH 6.2), and its first-order kinetic constant is determined to be 0.06802 min−1. The removal efficiency for Fe3S4/g-C3N4 is 1.61 and 13.34 times higher than that of the parent Fe3S4 and g-C3N4, respectively. At this time, g-C3N4 can effectively increase the leaching of S0. The effects of different active species in the TCH degradation experiment with the Fe1C0.75 composite were studied, and it is found that h+, ·O2−, and ·OH radicals are the main substances involved in the degradation of TCH. The synthesized Fe3S4/g-C3N4 catalyst is a promising heterogeneous photo-Fenton catalyst for the removal of organic pollutants.
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