Main factors for photocatalytic degradation of rhodamine B by MoS2 activated PMS

Towards highly efficient photocatalysis of peroxymonosulfate (PMS), heterogeneous catalyst MoS2 was prepared by hydrothermal method. The degradation efficiency of MoS2/PMS/light on Rhodamine B (RhB) was analyzed. The results indicated that the optimal conditions were: PMS concentration 2.0 mg/L, pH 5 and MoS2 dose 1.2 mg/L. Under these conditions, 71.23 ± 0.75% RhB was degraded, which was 2.67 times that of PMS alone. Cl− had a facilitative effect, and the degradation rate increased from 0.569 × 10−2 min−1 to 0.971 × 10−2 min−1, while humic acid showed significant inhibitory effect. According to the free radical trapping experiment, ·OH and SO4−· were the main active free radicals in the MoS2/PMS/light system.