废弃芦苇衍生生物炭中碱性氮位点的限域调控对过二硫酸盐非自由基路径的影响OA

Humic acid(HA),as a typical refractory organic compound in advanced wastewater treatment,poses a persistent challenge for effective removal.In persulfate-based advanced oxidation processes,the non-radical oxidation pathway demonstrates higher efficiency in oxidant utilization compared to conventional radical oxidation pathways.By optimizing activation strategies,targeted and precise regulation of the non-radical pathway can be achieved.However,the regulatory mechanism of alkaline nitrogen sites on the non-radical oxidation pathway has not yet been fully elucidated.In this study,waste reed was used as a precursor to synthesize nitrogen-doped biochar(N@BAC),which effectively activated peroxydisulfate(PDS)to achieve efficient degradation of HA.The research focused on elucidating the regulatory role of nitrogen species in the non-radical oxidation pathway.Results showed that nitrogen doping induced a layered wrinkled structure in the biochar,increasing the specific surface area to 409.60 m2∙g-1,while the relative content of pyridinic N and pyrrolic N increased nearly eightfold.In the N@BAC/PDS system,complete removal of HA was achieved.The carbon framework in N@BAC provided essential support for specific surface area,porosity,and active sites.Density functional theory calculations revealed that the introduction of pyridinic N and pyrrolic N altered the local charge distribution,increasing the electron transfer pathway contribution from 4％to 21％,thereby significantly enhancing the reaction kinetics of the system.These findings offer a novel strategy for improving PDS activation performance and open up new avenues for the resource utilization of aquatic plants.