Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 260, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2020.110072
Keywords
Bio-Pd/Fe@Fe3O4 NPs; Biorecovery; Palladium; Sodium diclofenac; Degradation; Enterococcus faecalis
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Funding
- National Natural Science Foundation of China [51178191]
- Science and Technology Planning Project of Guangdong Province [2017A020216013]
- Fundamental Research Funds for the Central Universities [2017PY012]
- Guangzhou Science and Technology Project [201604020055]
- National Training Program of Innovation and Entrepreneurship for Undergraduates Program [201710561103]
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Dehalogenation of emerging pollutants has attracted worldwide attention. In this study, novel bio-Pd/Fe@Pe(3)O(4) nanoparticles (NPs) were proposed to boost the heterogeneous Fenton reaction for degradation of sodium diclofenac (DCF). Specifically, Enterococcus faecalis (E. faecalis) was employed to achieve bio-recovered palladium (bio-Pd). Results showed that expected preparation of bio-Pd/Fe@Fe3O4 NPs was confirmed by various characterization techniques. The prepared bio-Pd/Fe@Fe3O4 NPs were spherical morphology with average size of 9 nm. Under the optimum conditions, the removal efficiency of 10 mg/L DCF in 20 min and 40 min reached as high as 94.69% and 99.65%, respectively. The dechlorination and mineralization efficiencies of DCF were 85.16% and 59.21% in 120 min, respectively. The main degradation pathway of DCF was complete mineralization with the final products CO2, chloride ions and H2O. The improvement of dechlorination efficiency was ascribed to the accelerated corrosion of nano zero valent iron (nZVI) by Pd/Fe galvanic effect and the rise of active hydrogen. Meanwhile, more ferrous ions were released into this solution, resulting in the higher heterogeneous Fenton reaction rate driven by bio-Pd/Fe@Fe3O4 NPs. Therefore, the findings suggested that bio-Pd/Fe@Fe3O4 NPs were effective catalysts for DCF dechlorination and mineralization. The work provided a novel strategy for degradation of halogen-containing environmental pollutants.
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