To reveal the surface active groups on N,S co-doped activated carbon (AC) for persulfate (PS) activation, control experiments on different modified ACs treated by oxidation, single-S and single-N doping were performed. The modified ACs were characterized by N₂ adsorption/desorption, Raman spectra, Boehm titration and XPS. It was found that the N,S co-doped AC presented higher catalytic performance than that of single-element doped ACs. The corresponding methyl orange (MO) removal and COD removal in 30 min reached 99 % and 69 % under mild conditions. The significant enhancement on N,S co-doped AC can ascribe to the presence of basic groups of quinone-like O, thiophene-like S, graphitic N and pyridinic N. S dopants were more active than O-containing groups and N dopants. Quenching experiment indicated that surface bound radical oxidation process was the dominant process for MO removal. These findings provided new insights into PS activation by N,S co-doped AC with functionalized surfaces.

为了揭示过硫酸盐（PS）活化的N，S共掺杂活性炭（AC）上的表面活性基团，对通过氧化，单S和单N掺杂处理的不同改性AC进行了对照实验。改性AC的特征在于N ₂吸附/解吸，拉曼光谱，Boehm滴定和XPS。发现N，S共掺杂的AC表现出比单元素掺杂的AC更高的催化性能。在温和条件下，30分钟内相应的甲基橙（MO）去除和COD去除分别达到99％和69％。N，S共掺杂AC的显着增强可归因于存在醌类O，噻吩类S，石墨N和吡啶N的碱性基团。S掺杂剂比含O的基团和N掺杂剂更具活性。淬火实验表明，表面键合自由基氧化过程是去除MO的主要过程。这些发现为N，S共掺杂AC与功能化表面激活PS提供了新的见解。