期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 420, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126553
关键词
Biochar; Peroxymonosulfate; Polycyclic aromatic hydrocarbons; Sediments; Microbial community structure
资金
- Ministry of Science and Technology of Taiwan
- MOST [106-2221-E-992-302-MY3, MOST 106-2221-E-992-303-MY3]
- US NSF IOA [1632899]
The LFBC/PMS process enhances the biological richness and diversity of sediment ecosystems, leading to changes in the bacterial community. Under optimal conditions, LFBC/PMS treatment can degrade 90% of total PAHs in 24 hours, with degradation efficiency for 2-, 3-, 4-, 5-, and 6-ring PAHs at 52%, 61%, 66%, 56%, and 29% respectively. The Langmuir-Hinshelwood equation successfully predicts the PAHs degradation kinetics over LFBC by PMS.
Sediment is an important final repository of persistent organic pollutants such as polycyclic aromatic hydrocarbons (PAHs). Herein, a novel catalyst of LaFeO3 nanoparticles supported on biochar was synthesized from water caltrop shell by chemical precipitation. The composite (LFBC) was used as peroxymonosulfate (PMS) activator to oxidize PAHs in real marine sediments. Systematic surface characterization confirmed the immobilization of well crystalline nano LaFeO3 particles onto the biochar surface. Under optimal conditions, i.e., [PMS] = 3 x 10-4 M, [LFBC] = 0.75 g/L, pH 6.0, and seawater, the total PAH degradation efficiency was 90%, while that of 2-, 3-, 4-, 5-, and 6-ring PAHs was 52%, 61%, 66%, 56%, and 29%, respectively, in 24 h. The Langmuir-Hinshelwood equation better predicted the PAHs degradation kinetics over LFBC by PMS. Interactions between surface oxygen species at LaFeO3 defective sites and the graphitized biochar network facilitated the PAHs degradation. Furthermore, changes in the bacterial community during the LFBC/PMS treatment were highlighted to assess the sustainable development of the sediment ecosystem. The LFBC/PMS process enhanced the biological richness and diversity of sediment eco-systems. The major phylum was Proteobacteria initially, while Hyphomonas was the genera after LFBC/PMS treatment of the sediment.
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