Efficient degradation of sodium diclofenac via heterogeneous Fenton reaction boosted by Pd/Fe@FeO nanoparticles derived from bio-recovered palladium.

Author(s) Wei, X.; Zhu, N.; Huang, X.; Kang, N.; Wu, P.; Dang, Z.
Journal J Environ Manage
Date Published 2020 Apr 15

Dehalogenation of emerging pollutants has attracted worldwide attention. In this study, novel bio-Pd/Fe@FeO 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@FeO NPs was confirmed by various characterization techniques. The prepared bio-Pd/Fe@FeO 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 CO, chloride ions and HO. 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@FeO NPs. Therefore, the findings suggested that bio-Pd/Fe@FeO NPs were effective catalysts for DCF dechlorination and mineralization. The work provided a novel strategy for degradation of halogen-containing environmental pollutants.

DOI 10.1016/j.jenvman.2020.110072
Keywords Diclofenac; Iron; Nanoparticles; Palladium; Water Pollutants, Chemical
ISSN 1095-8630
Citation J Environ Manage. 2020;260:110072.