A novel Fe/Mo co-catalyzed graphene-based nanocomposite to activate peroxymonosulfate for highly efficient degradation of organic pollutants

A novel 3D α-FeOOH@MoS 2 /rGO nanocomposite was successfully fabricated by a simple in situ hydrothermal method. It is a highly efficient heterogeneous catalyst in activation of peroxymonosulfate (PMS) for rapid degradation of rhodamine B (RhB), with 99.9% of RhB removed within 20 min. The introduction of rGO contributes to uniform dispersion and sufficient contact of α-FeOOH and MoS 2 nanosheets. Highly active Mo(IV) enhances the reduction of Fe(III), improves Fe(III)/Fe(II) conversion and promotes the generation of O 2 1 ${}^1{O}_2$ , which ensures an improved catalytic activity . MoS 2 /rGO hybrid can effectively solve the problem of material reunion and make α-FeOOH exhibit excellent catalytic performance. The α-FeOOH@MoS 2 -rGO/PMS system is a co-catalytic system based on the active components of α-FeOOH and MoS 2 . The main reactive oxygen species in the α-FeOOH@MoS 2 -rGO/PMS system are O 2 1 ${}^1{O}_2$ , S O 4 . − $S{O}_4^{.-}$ and ⋅ O 2 − $\cdot O_2^{-}$ , which contribute to a high reactivity over a wide range of pH (5–9). Besides, this system is highly resistant to anions ( C l − $C{l}^{-}$ , S O 4 2 − $S{O}_4^{2-}$ ) and natural organic matter (humic acid), and can be widely used for degradation of common organic pollutants. The α-FeOOH@MoS 2 /rGO is a promising Fenton-like catalyst for refractory organic wastewater treatment .