摘要
Antibiotic pollution from compounds such as tetracycline hydrochloride (TC-HCl) is a growing concern due to its persistence in the environment and potential to promote antimicrobial resistance. Conventional treatment methods for such wastewater often suffer from low efficiency and high operational costs. In this study, a bimetallic FeMn-BTC material with a two-dimensional sheet-like morphology was synthesized via a facile one-pot ultrasonic method for the efficient degradation of TC-HCl. By precisely selecting the Fe/Mn molar ratio to 7:3, a high density of accessible Fe(II) active sites was achieved. Under visible-light irradiation, FeMn-BTC degraded 92% of high-concentration TC-HCl (100 mg/L) with a reaction rate constant of 0.06703 min −1 , which is 10.5 times higher than that of the monometallic Fe-BTC. This remarkable enhancement is attributed to the incorporation of manganese, which facilitates the Fe(III)/Fe(II) redox cycle and extends the visible-light absorption range. Density functional theory (DFT) calculations further verify that manganese doping lowers both the adsorption and O-O bond cleavage energy barriers of H 2 O 2 . Mechanistic studies identify hydroxyl radicals (·OH) as the primary reactive species, with the synergistic interaction between iron and manganese promoting H 2 O 2 activation and charge-carrier separation. The catalyst also exhibits excellent stability over a wide pH range (3–9) and shows universal degradation activity toward various pollutants (methylene blue, rhodamine B, and malachite green) as well as in real water matrices containing common anions such as Cl − and SO 4 2− . After four consecutive recycling runs, the material retains over 75% of its initial degradation efficiency, outperforming most reported metal–organic framework-based catalysts. This work offers theoretical insights and a practical strategy for designing highly efficient photocatalysts for Fenton-like reactions.
危险品化学品经营许可证（带存储）