Enhanced degradation of 2,4-dichlorophenoxyacetic acid by pre-magnetization Fe-C activated persulfate: Influential factors, mechanism and degradation pathway.

摘要: 2,4-dichlorophenoxyacetic acid (2,4-D) is one of the most applicable herbicides in world, its residue aquatic environment threatens human health and ecosystems. In this study, for first time, inexpensive Fe-C after pre-magnetization (Pre-Fe-C) was used as heterogeneous catalyst to activate persulfate (PS) 2,4-D degradation, proving that Pre-Fe-C could significantly improve degradation dechlorination. The results indicated stability reusability were much better than Fe0 (Pre-Fe0), while leaching iron ion lower, indicating using not only reduced post-treatment cost, but also enhanced removal dechlorination efficiency 2,4-D. Several important parameters including initial pH, dosage, PS concentration affecting by Pre-Fe-C/PS investigated compared with Fe-C/PS, observing a 1.2-2.7 fold enhancement rate characterized scanning electron microscopy (SEM), energy dispersive X-ray (EDX) SEM-EDX-mapping, suggesting content Fe O changed more obviously magnetization. intermediates, such chloroquinol, 2-chlorophenol, identified gas chromatography mass spectrometry (GC/MS) an (IC), possible pathway proposed.