Abstract
Copper oxide/calcium tungsten oxide (Cu2O/CaWO4) was synthesized via simple hydrothermal synthesis and analyzed via spectral techniques for the photocatalytic degradation of tetracycline and doxycycline, two antibiotics. An optimized ratio of Cu2O/CaWO4(7:1) showed the best photoelectrochemical performance, which degraded 91.0 % and 92.2 % tetracycline and doxycycline, respectively, in 60 min under visible light. Holes and electrons were generated at the Cu2O/CaWO4 interface owing to the formation of p–n heterojunction, which induced a built-in electric field inside the composite catalyst, which showed better activity than those of Cu2O and CaWO4 monomers. The degradation of tetracycline by the recycled composite catalyst Cu2O/CaWO4(7:1) maintained 70.0 % efficiency after 5 cycles, indicating the stability of the catalyst
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