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The Gd₂YSbO₇/ZnBiNbO₅ heterojunction photocatalyst was synthesized for the first time by the facile in situ precipitation method. The structural properties of a Gd₂YSbO₇/ZnBiNbO₅ heterojunction photocatalyst were characterized by X-ray diffractometer, scanning electron microscope-X ray energy dispersive spectra, X-ray photoelectron spectrograph and UV-Vis diffuse reflectance spectrophotometer. The band gap energy (BGE) of Gd₂YSbO₇ or ZnBiNbO₅ was found to be 2.396 eV or 2.696 eV, respectively. The photocatalytic property of Gd₂YSbO₇ or ZnBiNbO₅ or Gd₂YSbO₇/ZnBiNbO₅ heterojunction photocatalyst (GZHP) was reported. After a visible-light irradiation of 145 minutes (VLI-145 min), the removal rate (RER) of benzotriazole reached 99.05%, 82.45%, 78.23% or 47.30% with Gd₂YSbO₇/ZnBiNbO₅ heterojunction (GZH), Gd₂YSbO₇, ZnBiNbO₅ or N-doped TiO₂ (NTO) as photocatalyst. In addition, the kinetic constant k, derived from the dynamic curve toward benzotriazole concentration and visible light irradiation time with GZH as a photocatalyst, reached 0.0213 min⁻¹. Compared with Gd₂YSbO₇ or ZnBiNbO₅ or NTO, GZHP showed maximal photocatalytic activity (PHA) for the photocatalytic degradation of benzotriazole under visible-light irradiation. The RER of total organic carbon during the photocatalytic degradation of benzotriazole reached 90.18%, 74.35%, 70.73% or 42.15% with GZH as a photocatalyst or with Gd₂YSbO₇, ZnBiNbO₅ or NTO as a photocatalyst after VLI-145 min. Moreover, the kinetic constant k, which came from the dynamic curve toward total organic carbon concentration and visible light irradiation time with GZH as a photocatalyst, reached 0.0110 min⁻¹. Based on above results, GZHP showed the maximal mineralization percentage ratio when GZHP degraded benzotriazole. The results showed that hydroxyl radicals was the main oxidation radical during the degradation of benzotriazole. The photocatalytic degradation of benzotriazole with GZH as a photocatalyst conformed to the first-order reaction kinetics. Our research aimed to improve the photocatalytic properties of the single photocatalyst. Full article