A Novel MnOOH Coated Nylon Membrane for Efficient Removal of 2,4-Dichlorophenol through Peroxymonosulfate Activation

Abstract 2,4-Dichlorophenol (2,4-DCP) is a highly toxic water contaminant. In this study, we demonstrate a novel catalytic filtration membrane by coating MnOOH nanoparticles on nylon membrane (MnOOH@nylon) for improved removal of 2,4-DCP through a synergetic “trap-and-zap” process. In this hybrid membrane, the underlying nylon membrane provides high adsorption affinity for 2,4-DCP. While the immobilized MnOOH nanoparticles on the membrane surface provide catalytic property for peroxymonosulfate activation to produce reactive oxygen species (ROS), which migrate with the fluid to the underlying nylon membrane pore channels and react with the adsorbed 2,4-DCP with a much higher rate (0.9575 mg L-1 min-1) than that in the suspended MnOOH particle system (0.1493 mg L-1 min-1). The forced flow in the small voids of the MnOOH nanoparticle coating layer (