The novel H₂O₂–MnO₂ system was developed to achieve highly efficient membrane cleaning for both fouled PVDF and PES membranes in this study. Compared with conventional chemical cleaning process in which the whole membrane module had to be soaked in highly concentrated solution of chemical reagent for long period of time, the H₂O₂–MnO₂ cleaning process conducting for only 5 min in 0.5 wt% H₂O₂ solution could achieve more than 95% recovery of permeate flux and almost total removal of the irreversible foulants. More importantly, the permeate flux and filtration efficiency of the membrane could be still kept stable after 6 runs of consecutive fouling and cleaning. Based on the systematic microscopic analyses, Electron Spin Resonance (ESR), Fourier Transform Infrared Spectroscopy (FTIR), as well as the quenching experiments with different free radical scavengers, the outstanding performance of H₂O₂–MnO₂ system was attributed to the generation of both free radicals and abundant oxygen simultaneously, leading to the physico-chemical membrane cleaning. Conclusively, the newly developed H₂O₂–MnO₂ system demonstrated noteworthy advantages on efficient membrane cleaning, and exhibited highly potential for the wide application in practical water treatment process.

在本研究中，开发了新颖的H ₂ O ₂ -MnO ₂系统，以对污损的PVDF和PES膜实现高效的膜清洁。与传统的化学清洗工艺相比，整个膜组件必须长时间浸泡在高浓度的化学试剂溶液中，而H ₂ O ₂ -MnO ₂清洗工艺在0.5 wt％H _2中仅进行5分钟。Ø ₂溶液可以实现95％以上的渗透通量回收率，几乎可以完全去除不可逆的污垢。更重要的是，在连续运行6次结垢和清洁后，膜的渗透通量和过滤效率仍可保持稳定。基于系统的微观分析，电子自旋共振（ESR），傅立叶变换红外光谱（FTIR）以及不同自由基清除剂的淬灭实验，H ₂ O ₂ -MnO ₂体系的出色性能归因于同时产生自由基和丰富的氧气，从而实现了理化膜的清洁。最后，新开发的H ₂ O ₂ -MnO₂系统在高效膜清洁方面显示出显着优势，并且在实际水处理过程中具有广阔的应用前景。