| Summary: | The dual Z-scheme heterojunction CuBi<sub>2</sub>O<sub>4</sub>/Bi<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub>/Sn<sub>3</sub>O<sub>4</sub>(CBS) was successfully constructed through in situ growth methods, and its photocatalytic performance was evaluated via degradation of tetracycline hydrochloride under visible light. Out of all samples, CBS-2 exhibited the highest photocatalytic activity, with an apparent rate constant of 2.34, 20.16, and 44.17 times that of Bi<sub>2</sub>Sn<sub>2</sub>O<sub>7</sub>, CuBi<sub>2</sub>O<sub>4</sub>, and Sn<sub>3</sub>O<sub>4</sub>, respectively. Even after four cycles, the photocatalytic efficiency remained above 85%. The improvement can be attributed to the construction of the Z-scheme heterojunction, which effectively promotes the separation and migration of photogenerated carriers. The possible photocatalytic degradation mechanism of dual Z-scheme heterojunction CBS was deduced based on the theory of free radical capture and energy band.
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