In this novel research work, Cr³⁺ incorporated and TiO₂-modified porous SmFeO₃-based nanocomposites are prepared via utilizing carbon nanosphere (CNS) as a hard template. Our experimental results proved that the introduction of porosity by employing a sequential template approach (STA) has upgraded the performances of SmFeO₃ nanoparticles. Remarkably, the incorporation of Cr³⁺ increased the light absorption capability by generating surface states and regulating band gap positions, whereas the fabrication of TiO₂ enlarged surface area and enhanced charge separation by modulating high-level energy electrons (HLEEs). According to our experimental techniques, including TEM, HRTEM, SEM, TGA, BET, PEC, FS, and PL, it is demonstrated that most optimal 6Cr-PSFO and 4TiO₂/6Cr-PSFO nanocomposites have high porosity, appropriate bandgap positions, large surface area, and show superior visible-light photocatalytic activities compared to pristine SmFeO₃ nanoparticles. Compared to pristine SFO, the activities of most active 4TiO₂/6Cr-PSFO nanocomposites are improved by 8-fold for CO₂ conversion and 3-times for 4-chlorophenol (4-CP) degradation. The radical trapping experiment confirmed that the ^·OH i are the most active species and has a vital role in the photocatalytic degradation of 4-CP. Moreover, our experimental results are verified and consistent with theoretical calculations and computational studies. Finally, our research work will open up a new gateway for the designing of novel porous SmFeO₃-based nanocomposites and their use in CO₂ conversion and pollutant removal.

在这项新颖的研究工作中，以碳纳米球（CNS）为硬模板，制备了掺入Cr ³⁺和TiO _2改性的多孔SmFeO ₃基纳米复合材料。我们的实验结果证明，通过采用顺序模板法（STA）引入孔隙率提高了SmFeO ₃纳米颗粒的性能。值得注意的是，Cr ³⁺的加入通过产生表面态和调节带隙位置来提高光吸收能力，而制备 TiO ₂通过调制高能电子（HLEE）来扩大表面积并增强电荷分离。根据我们的实验技术，包括 TEM、HRTEM、SEM、TGA、BET、PEC、FS 和 PL，证明了最优化的 6Cr-PSFO 和 4TiO ₂ /6Cr-PSFO 纳米复合材料具有高孔隙率、适当的带隙位置、大表面积，并且与原始的 SmFeO ₃纳米颗粒相比显示出优异的可见光光催化活性。与原始 SFO 相比，大多数活性 4TiO ₂ /6Cr-PSFO 纳米复合材料的 CO ₂转化活性提高了 8 倍，4-氯苯酚 (4-CP) 降解提高了 3 倍。自由基捕获实验证实了^·OH i 是最活跃的物种，在 4-CP 的光催化降解中起着至关重要的作用。此外，我们的实验结果得到了验证，并与理论计算和计算研究一致。最后，我们的研究工作将为新型多孔SmFeO ₃基纳米复合材料的设计及其在CO ₂转化和污染物去除中的应用开辟新途径。