The treatment of antibiotic wastewater is one of the environmental problems that humans must solve. Low cost and high activity photocatalyst are the key to the treatment of antibiotic wastewater environment. In this work, a single-layer coated TiO2/g-C3N4/BN (TCB) ternary composite heterojunction photocatalyst was successfully prepared. The appropriate amount of BN is doped into the composite to form the I/II type double heterogeneous junction, which promotes the charge transfer and improves the separation efficiency of photogenic carriers. Notably, heterogeneous photocatalysis was constructed to degrade tetracycline (TCL) in 30 minutes with a rapid degradation efficiency of 94.96%. When the light was increased to 60 min, the removal rate of TCH from aqueous solution could reach 99.16%. The reaction dynamics constant of 0.10128 s-1, which was 5.73 and 3.27 times higher than that of TiO2 and TiO2/g-C3N4, respectively. This work reveals the potential application of ternary composites with double heterojunction for photocatalytic degradation as well as provides reference value for titanium matrix composites for antibiotic wastewater treatment.

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