Open AccessDual application of Shewanella oneidensis MR‐1 in green biosynthesis of Pd nanoparticles supported on TiO 2 nanotubes and assisted photocatalytic degradation of methylene blue
Author(s) -
Song Xiaojie,
Shi Xianyang,
Yang Mi
Publication year - 2018
Publication title -
iet nanobiotechnology
Language(s) - English
Resource type - Journals
ISSN - 1751-875X
DOI - 10.1049/iet-nbt.2017.0130
Subject(s) - shewanella oneidensis , photocatalysis , nanocomposite , methylene blue , materials science , nanoparticle , chemical engineering , x ray photoelectron spectroscopy , nanomaterials , electron paramagnetic resonance , transmission electron microscopy , nuclear chemistry , catalysis , nanotechnology , chemistry , bacteria , organic chemistry , genetics , physics , nuclear magnetic resonance , engineering , biology
Biosynthesised nanocomposites have attracted growing interests attributed to their ‘green’ synthesis nature in recent years. Shewanella oneidensis MR‐1, a dissimilatory metal‐reducing bacterium, was used to reduce palladium (II) nitrate to palladium (0) nanoparticles (Pd NPs) under anaerobic conditions, resulting in the in situ formation of Pd NPs immobilised on TiO 2 nanotubes (TNTs) (Pd/TNTs nanocomposites). The Pd/TNTs nanocomposites were characterised by transmission electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, energy dispersive X‐ray, and electron spin resonance, respectively. The results indicated that Pd NPs are successfully grown on the TNTs without aggregation. Photocatalytic degradation of methylene blue (MB) by Pd/TNTs nanocomposites under simulated sunlight was also investigated. Pd/TNTs nanocomposites had photocatalytic efficiency superior to that of single TiO 2 nanomaterials. The photocatalytic activity of Pd/TNTs nanocomposites can be enhanced by S. oneidensis MR‐1. The results showed that after only 10 min, the degradation ratio of MB reached 98.7% by Pd/TNTs nanocomposites when simultaneously assisted with S. oneidensis MR‐1.