【标题】Verification of positive impact of critical soil mineral on persulfate-based in-situ remediation of polybrominated diphenyl ether (PBDE): Robust role of goethite under multivariant conditions

【期刊】Journal of Environmental Chemical Engineering

【第一作者】吴佩雯

【摘要】Polybrominated diphenyl ethers (PBDEs) as a type of persistent organic pollutants (POPs), are widely accumulated in soils and sediment. Goethite, the crucial constituent of soils and sediments, is investigated to verify its impact on 2,2’,4,4’-tetrabromodiphenyl ether (BDE-47) elimination under simulated in-situ persulfate (PS) treatment occasion. Results showed that goethite significantly enhanced the BDE-47 elimination in the PS-based remediation, and ⋅OH and SO4⋅ act as dominant reactive species, contributing 52.7 % and 47.3 % of BDE-47 degradation, respectively. BDE-47 can be deeply degraded and only two oxidized intermediates were identified. The decrease of initial BDE-47 concentration and solution pH can significantly promote BDE-47 elimination. In the Goe/PS system, co-existing anions (Cl , SO4 2 , NO3, HCO3, and HPO4 2 ) inhibit the BDE-47 degradation, whereas natural organic matters coexistence and metal ions incorporation facilitates it. Surprisingly, we found that the environmental concentration of BDE-47 was readily degraded at low PS concentration in the presence of goethite. In addition, Goe/PS system also exhibited the universality in lower-brominated PBDEs degradation. This work provides a new perspective for enhanced in-situ remediation of PBDE-contaminated soil, sediment, and even water bodies by utilizing natural activated substances in environmental matrix, and clarifies the mechanism of PBDEs degradation that inevitably occurs in all in-situ sulfate radical-based AOPs.

【文章链接】https://doi.org/10.1016/j.jece.2025.116664