Tunable Synthesis of Hierarchical BiOCl Microspheres for Efficient Photocatalytic Degradation of Pharmaceutical Wastewater
A series of hierarchical BiOCl microspheres with different sizes was prepared with a diethylene glycol(DEG) mediated solventhermal method using BiCl3 as precursor and urea as a precipitant.The obtained samples were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results suggest that the crystallinity and size could be influenced by precipitants dosage (molar ratio of urea to BiCl3) and solventhermal time.BiOCl microspheres with sizes of 1-5 μm were synthesized by tuning reaction conditions.The as-prepared BiOCl exhibited high photocatalytic efficiency towards the degradation of carbamazepine(CBZ) and sulfamethoxazole (SMZ) under UV light irradiation.Especially,BiOCl samples obtained at precipitants dosages of 10 ∶ 1 and 15 ∶ 1 with hydrothermal time of 30 min exhibited superior photocatalytic activity to TiO2(P25).The results indicate that the hierarchical BiOCl microspheres are promising candidate for the removal of the recalcitrant pharmaceutical contaminants.
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