Despite the significant advantages of uniformly decorated CPB NCs over ZIF-8, achieving a stable and well-distributed nanocomposite remains challenging. Our research focuses on elucidating three critical aspects: the decoration mechanism, the nature of charge transfer, and the proof of the photocatalytic mechanism. A comprehensive understanding of these processes is essential for optimizing material performance and advancing CPB/ZIF-8-based photocatalytic applications. The precise mechanism of CPB NCs integration with ZIF-8 remains unclear. While ligand exchange is a possible pathway, alternative processes may also contribute to the decoration process. For instance, the confined growth of ZIF-8 in mesoporous structures suggests the possibility of CPB NCs nucleating and growing within ZIF-8 pores. Gaining insight into this mechanism is crucial for ensuring uniform decoration and composite stability. Precise control over ligand exchange and surface interactions is necessary to facilitate proper integration, minimize defects, and enhance charge transfer efficiency. A deeper understanding of these interactions will not only streamline synthesis but also enable the fine-tuning of photocatalytic performance, paving the way for scalable production and commercialization. Additionally, the charge transfer dynamics between CPB NCs and ZIF-8 remain largely unexplored, yet they play a crucial role in determining photocatalytic efficiency. Here, we present a straightforward and effective synthesis method for preparing a uniformly distributed CPB/ZIF-8 nanocomposite. Fourier-transform infrared (FTIR) spectroscopy analysis confirmed that ligand exchange is the primary driving force behind composite formation, where the native ligands of CPB NCs were replaced by the imidazole ligands of ZIF-8. This provided valuable insights into the chemical interactions within the composite.