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• Cost-competitive hybrid (MnFe-LDO–biochar) photocatalyst was successfully prepared. • MnFe-LDO–biochar has a bandgap of 2.85 eV and a high photocurrent response of 3.8 μA. • Large surface area containing mixed metal oxide oxidizing sites of MnFe-LDO–biochar improved its antibiotic degradation. • 50 mg MnFe-LDO–biochar/K 2 S 2 O 8 degraded ∼98 % tetracycline within 60 min upon exposure to a UV light. • MnFe-LDO–biochar performed sufficiently in a wide practical pH without significant leaching. A high-efficiency layered double oxide-biochar hybrid (MnFe-LDO–biochar) catalyst was successfully synthesized by the co-precipitation-calcination process and used to effectively remove tetracycline (TC) pollution. The characterization results verified that MnFe-LDO–biochar possesses a specific surface area of 524.8 m2 g−1, appropriate bandgap (2.85 eV), a high photocurrent response (3.8 μA cm–2), a saturation magnetization of 28.5 emu g−1 and a mixture of interconnected pores. 40 % of TC was removed after 30 min when 50 mL TC solution (20 mg L−1) was treated with 50 mg MnFe-LDO–biochar in the dark and reached ∼98 % degradation rate within 240 min upon exposure to a UV light. Notably, in the presence of H 2 O 2 or K 2 S 2 O 8 , the degradation rate of MnFe-LDO–biochar was shortened to 60 min with an average pseudo-first-order rate constant of 0.0445 min−1. The antibiotic removal rate of the cost-competitive MnFe-LDO–biochar surpassed several reported materials and maintained ∼80 % reuse efficiency after 3rd successive cycles. The TC photodegradation mechanism is multiprocess induced majorly by OH and SO 4 − while h+ and O 2 − contributed partly to the mineralization. This work highlights the powerful synergistic combination of layered double oxide (LDO) and biochar. [ABSTRACT FROM AUTHOR]