Combining heterojunction with advanced structures is a promising tool to enhance the photoelectrochemical performance of semiconductor photocatalysts for environmental remediation. Herein, a novel multi-heterojunction TiO₂@Bi₂O₃ (MHTB) hollow photocatalyst is successfully constructed by loading Bi₂O₃ nanoparticles on the surface of inner TiO₂ and outside of TiO₂ shell. Photoelectrochemical characterization shows that the formation of multiple heterojunctions at the TiO₂@Bi₂O₃ interfaces facilitates faster separation and transfer of photoinduced charge carriers than that of conventionally reported p-n heterojunction photocatalysts. Because of the separated two layers of Bi₂O₃ and unique hollow structure, the photocatalytic performance of MHTB is significantly improved, leading to excellent photo-degradation rate constant (k = 0.0165 min⁻¹) for the degradation of levofloxacin, which approaches 1.5-fold and 2.6-fold increase than that of TiO₂@Bi₂O₃@TiO₂ (n-p-n heterojunction) and TiO₂@Bi₂O₃ (n-p heterojunction), respectively. Notably, the MHTB photocatalyst exhibits an excellent anti-interference capability for the interference of environmental factors. Moreover, the photocatalytic activity, crystal structure and bonding energy of MHTB photocatalyst remain unchanged after being used several times, indicating an excellent stability. Therefore, this finding opens a new door to develop highly active photocatalysts with multiple heterojunctions for efficient pollutant removal and environmental remediation.

将异质结与先进结构相结合是提高半导体光催化剂用于环境修复的光电化学性能的有前途的工具。_{在此，通过将Bi 2} O ₃纳米粒子负载在内TiO _{2表面和TiO 2}壳外，成功构建了一种新型多异质结TiO ₂ @Bi ₂ O ₃ (MHTB) 中空光催化剂。光电化学表征表明在 TiO ₂ @Bi ₂ O _{3处形成多个异质结}与传统报道的pn异质结光催化剂相比，界面促进了光诱导电荷载流子的更快分离和转移。由于分离的两层Bi ₂ O ₃和独特的中空结构，MHTB的光催化性能显着提高，导致左氧氟沙星降解具有优异的光降解速率常数（k  = 0.0165 min ^-1），接近1.5比 TiO ₂ @Bi ₂ O ₃ @TiO ₂ (npn 异质结) 和 TiO ₂ @Bi ₂ O _{3增加 - 倍和 2.6 倍}（np异质结），分别。值得注意的是，MHTB光催化剂对环境因素的干扰表现出优异的抗干扰能力。此外，MHTB光催化剂的光催化活性、晶体结构和键能在多次使用后均保持不变，表明其具有优异的稳定性。因此，这一发现为开发具有多个异质结的高活性光催化剂以有效去除污染物和环境修复打开了新的大门。