Insights into the enhanced fluoranthene degradation in citric acid coupled Fe(II)-activated sodium persulfate system

Autor: Jiaqi Dong, Xianxian Sheng, Yulong Liu, Peng Wang, Zhanpeng Lu, Qian Sui, Shuguang Lyu
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Water Supply, Vol 22, Iss 5, Pp 4822-4838 (2022)
Druh dokumentu: article
ISSN: 1606-9749
1607-0798
DOI: 10.2166/ws.2022.190
Popis: Polycyclic aromatic hydrocarbons (PAHs), which are present in contaminated groundwater, have attracted increasing attention because of their serious harm to humans. In this study, the degradation performance of fluoranthene (FLT), a typical tetracyclic PAHs in organic contaminated sites, was investigated in the persulfate (PS)/Fe(II)/citric acid (CA) system. The effects of PS, CA, and Fe(II) doses on FLT degradation were tested. With the molar ratio at 60/20/5/1 of PS/Fe(II)/CA/FLT, FLT removal reached 96.3% in 120 min, much higher than 62% removal without CA at the same PS and Fe(II) doses, indicating that the addition of CA could remarkably enhance the FLT degradation. The water quality conditions (pH, anions and humic acid) were also investigated for their effects on FLT degradation. The results of probe tests, electron paramagnetic resonance detection and scavenging experiments showed that and acted predominantly on FLT degradation. The influence of surfactants on FLT degradation was examined. Furthermore, the primary degradation intermediates of FLT were detected by GC-MS and the possible degradation pathways of FLT were proposed. Finally, the effectiveness of the PS/Fe(II)/CA process for the FLT degradation in actual groundwater demonstrated that the process has a great prospect for the remediation of FLT-contaminated groundwater. HIGHLIGHTS The enhancing effect of CA on FLT degradation was investigated.; and were the primary ROS in the PS/Fe(II)/CA system for FLT degradation.; The possible degradation pathways of FLT were proposed.; The effects of surfactants on FLT degradation were investigated.; Effective degradation of FLT in actual groundwater was achieved.;
Databáze: Directory of Open Access Journals
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