Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 436, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129254
Keywords
Fe2+& dithionite; Persulfate; Sulfamethoxazole; Density functional theory (DFT); Detoxification
Categories
Funding
- Shenzhen Sustainable Development Project [KCXFZ20201221173602008]
- Shenzhen Scientific Research Foundation for High-level Talent [KQJSCX20180328165658476]
Ask authors/readers for more resources
The study found that the Fe2+ and dithionite activated PDS system has higher efficiency in degrading SMX, and is effective at near-neutral pH. SO4.- and .OH were identified as the dominant reactive species, with functional groups playing a key role in SMX degradation.
Advanced oxidation process (AOPs) is one of the most effective technologies for organic pollutants removal. In this study, diverse reactive species generation and enhanced sulfamethoxazole (SMX) degradation were investigated based on persulfate (PDS) activated by Fe2+& dithionite (DTN). When involving Fe2+& dithionite in PDS, SMX degradation efficiency reached 84 % within 30 min following a pseudo-first-order kinetic, which was higher than those in Fe2+/PDS (50.4 %) and Fe2+/O-2/DTN (41.3 %). SO4.- and .OH were identified as dominant reactive species with a crucial role of FeSO3+ based on quenching experiment and electron spin resonance (ESR). The contributions of SO4. inverted exclexpressionmexpressiontion , .OH, and other species to SMX degradation were 60.1 %, 33.9 %, and 6 %, respectively. In Fe2+/DTN/PDS system, SMX was effectively degraded under nearly neutral pH (5.0-9.0), with activation energy of 96.04 kJ.mol(-1). The experiments and density functional theory (DFT) calculation demonstrated that three functional groups (benzenesulfonamido, benzene ring, and oxazole ring) were attacked for SMX degradation. Moreover, acute toxicity to Vibrio fischeri has enhanced in the earlier degradation process due to the intermediates and weaken with the continuous reaction. This work not only provides a high-activity SO4. inverted exclexpressionmexpressiontion -AOP for refractory pollutant treatment with possible dual radical generation resources, but elucidated diverse reactive species formation with Fe2+& dithionite.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available