Revealing the activation mechanism of periodate by groundwater treatment plant waste iron-containing sludge for sulfadiazine removal: the key activation role of transition metal Mn

This work simplified the structure of waste iron-containing sludge from groundwater treatment plants to explore its mechanism of activating periodate(PI) for degrading organic pollutants in water. The pH during preparation was used to regulate the crystallinity and the doping of transition metal Mn in the precursor solution to prepare catalysts similar to the waste iron-containing sludge. Sulfadiazine (SDZ) was selected as the model contaminant, and it was found that the efficiency of the prepared catalyst to remove the contaminants was 100% in 10min by activating PI. Combining electrochemical and performance experiment results, it was found that the amorphous part of the material can optimize the electronic structure and enhance the electron transfer ability. However, Mn doping can also reduce the electron transfer resistance, and the synergistic effect of Fe-Mn bimetal occupied a more important part in the entire catalytic system. According to the results of Electron paramagnetic resonance (EPR) and quenching experiments, it was found that although a variety of free radicals were produced, the active substances that contributed the most were IO 3 • and 1 O 2 . The materials showed certain environmental adaptability in the subsequent experiments. This study provides theoretical support for removing organic pollutants from waste iron-containing sludge and provides some basic insights for bimetal synergistic activation of PI.