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 (<200 nm) and channels of nylon membrane (~220 nm) is critical to improve the 2,4-DCP adsorption, ROS production, and 2,4-DCP degradation. The hybrid MnOOH@nylon membrane also improves the stability of the MnOOH nanoparticles and the resistibility to competitive anions, due to much higher concentration ratio of the adsorbed 2,4-DCP and produced ROS versus background competitive ions in the membrane phase. This study provides a generally applicable approach to achieve high removal of target contaminants in catalytic membrane processes.

2,4-二氯苯酚（2,4-DCP）是剧毒的水污染物。在这项研究中，我们展示了一种新型的催化过滤膜，该膜通过将MnOOH纳米颗粒涂覆在尼龙膜（MnOOH @ nylon）上，以通过协同的“捕集”过程来改善2,4-DCP的去除。在这种杂化膜中，下面的尼龙膜对2,4-DCP具有很高的吸附亲和力。虽然固定在膜表面的MnOOH纳米颗粒提供了过氧化单硫酸盐活化的催化性能，以产生活性氧（ROS），但随着流体迁移到下面的尼龙膜孔道中，并与吸附的2,4-DCP发生了更高的反应速率（0.9575 mg L ^-1 min ^-1）比悬浮MnOOH粒子系统的速率（0.1493 mg L ^-1 min ^-1）。在MnOOH纳米颗粒涂层（<200 nm）和尼龙膜通道（〜220 nm）的小空隙中强制流动 对于改善2,4-DCP吸附，ROS产生和2,4-DCP降解至关重要。MnOOH @尼龙杂化膜还提高了MnOOH纳米颗粒的稳定性和对竞争性阴离子的抵抗力，这是由于在膜相中吸附的2,4-DCP和产生的ROS的浓度比与背景竞争性离子相比更高。这项研究提供了一种普遍适用的方法，可以在催化膜工艺中实现目标污染物的高度去除。