However, it is important to consider the engineering part related to process optimization when a photocatalyst was applied. Furthermore, the limitation of heterogeneous photocatalysis treatment is that the efficacy can be influenced by the water environment . For example, Martínez and co-workers found that there exists an optimal load value of TiO2-P25 for CBZ degradation. While exceeding this value, scattering phenomena appear, and the generation of e−/h+ pairs on the surface of the catalyst loses efficacy, leading to a decrease in the degradation rate . Meanwhile, Haroune and co-workers proposed that the effect of environmental parameters, such as PD 0332991 and ionic strength could affect the photocatalytic degradation efficiency of CBZ . Thus, there is a need to study some key operating parameters to understand their influence on the degradation efficiency and govern their behavior for the engineering application.
In present work, the photocatalytic oxidation of CBZ over hierarchical BiOCl microspheres was systematically studied. The batch experiments were carried out to examine the critical parameters of BiOCl dosage, CBZ concentrations, solution pH, common inorganic anions (Cl−, NO3−, and HCO3−) and cations (Mg2+, Ca2+, and Al3+) on the CBZ degradation. Additionally, this work also investigated the arisen intermediates during the BiOCl photodegradation process of CBZ using HPLC–ESI-Q-TOF-MSn technology in order to observe the tentative reaction pathway of CBZ decay.