Efficient visible-light photodegradation of RhB via N-Doped BiOCl/PS photocatalytic system

As a promising technology, the photocatalysis/persulfate-oxidation hybrid (PPOH) system has been used to degrade organic pollutants. Under visible light, a new N-Doped BiOCl/PS system was developed to degrade Rhodamine B (RhB) effectively. Using an ethylenediamine-assisted hydrothermal technique, N-BiOCl photocatalyst was manufactured and analyzed. Nanoplates self-assemble N-BiOCl to form an aggregated flower-like microstructure, which according SEM measurements. The absorption edge of N-BiOCl sample has a significant red shift toward longer wavelengths. In addition, the SBET values of the N-BiOCl is significantly increased. Compared with BiOCl, using 0.3 g/L N-BiOCl photocatalyst and 2 mM PS, 10 mg/L RhB (100 mL) could be removed in 8 minutes with the removal rate of 98% under visible-light irradiation. Through chemical quenching experiment and EPR direct detection, it is proved that the main reactive oxygen species (ROS) of visible-light catalytic system are ·OH, ·SO4-, ·O2- and h+, in which ·O2- and h+ play a leading role.