title: Effect of Fe-Pd bimetallic nanoparticles on Sphingomonas sp. PH-07 and a nano-bio hybrid process for triclosan degradation.
abstract: In this study, we have evaluated the effect of palladium-iron bimetallic nanoparticles (nFe-Pd) on diphenyl ether (DE) degrading bacterial strain Sphingomonas sp. PH-07 as well as a sequential nano-bio hybrid process with nFe-Pd as catalytic reductant and PH-07 as biocatalyst for degradation of triclosan. Strain PH-07 grew well in the presence of nFe-Pd up to 0.1g/L in minimal salts medium with DE as carbon source. In aqueous system, TCS (17.3 μM) was completely dechlorinated within 2h by nFe-Pd (0.1g/L) with concomitant release of 2-phenoxyphenol (16.8 μM) and chloride ions (46 μM). All possible dichloro- and monochloro-2-phenoxyphenol intermediates were identified by HPLC and GC-MS analyses, and the dechlorination pathway was proposed. Addition of PH-07 cells into the reactor effectively degraded the 2-phenoxyphenol. Our results reveal that strain PH-07 survives well in the presence of nFe-Pd and nFe-Pd/PH-07 hybrid treatment could be a potential strategy for degradation of TCS.
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea.
authors.forename: Kumarasamy
authors.initials: K
authors.lastname: Murugesan
authors.forename: Varima
authors.initials: V
authors.lastname: Bokare
authors.forename: Jong-Rok
authors.initials: JR
authors.lastname: Jeon
authors.forename: Eun-Ju
authors.initials: EJ
authors.lastname: Kim
authors.forename: Jae-Hwan
authors.initials: JH
authors.lastname: Kim
authors.forename: Yoon-Seok
authors.initials: YS
authors.lastname: Chang
mesh_terms: D000891:Anti-Infective Agents, Local / Q000378:metabolism*; D055162:Biocatalysis; D008401:Gas Chromatography-Mass Spectrometry; D007501:Iron; D053768:Metal Nanoparticles; D010165:Palladium; D020578:Sphingomonas / Q000187:drug effects* / Q000254:growth & development; D014260:Triclosan / Q000378:metabolism*
chemical_list: D000891:Anti-Infective Agents, Local; D014260:Triclosan; D010165:Palladium; D007501:Iron