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Antibiotic pollution of water resources is a global problem, and the development of new treatments for destroying antibiotics in water is a priority research. We successfully manufactured recyclable magnetic Fe 3 O 4 /g-C 3 N 4  through the electrostatic self-assembly method. Selecting tetracycline (TC) as the target pollutant, using Fe 3 O 4 /g-C 3 N 4  and H 2 O 2  developed a heterogeneous optical Fenton system to remove TC under visible light. Fe 3 O 4 /g-C 3 N 4  was systematically characterized by SEM, TEM, XRD, FTIR, XPS, DRS, and electrochemical methods. The removal efficiency of 7% Fe 3 O 4 /g-C 3 N 4  at pH = 3, H 2 O 2  = 5 mM, and catalyst dosage of 1.0 g/L can reach 99.8%. After magnetic separation, the Fe 3 O 4 /g-C 3 N 4  photocatalyst can be recycled five times with minimal efficiency loss. The excellent degradation performance of the prepared catalyst may be attributed to the proper coupling interface between Fe 3 O 4  and g-C 3 N 4  which promotes the separation and transfer of photogenerated electrons. Photogenerated electrons can also accelerate the conversion of Fe 3+  to Fe 2+ , thereby producing more ˙OH. The new Fe 3 O 4 /g-C 3 N 4  can be used as a raw material for advanced oxidation of water contaminated by refractory antibiotics.

environmental technology

Magnetic recyclable heterogeneous catalyst Fe 3 O 4 /g-C 3 N 4  for tetracycline hydrochloride degradation via photo-Fenton process under visible light