2 research outputs found
Layer-by-Layer Photocatalytic Assembly for Solar Light-Activated Self-Decontaminating Textiles
Novel
photocatalytic nanomaterials that can be used to functionalize
textiles, conferring to them efficient solar-light-activated properties
for the decontamination of toxic and lethal agents, are described.
Textiles functionalized with one-dimensional (1D) SnS<sub>2</sub>-based
nanomaterials were used for photocatalytic applications for the first
time. We showed that 1D SnS<sub>2</sub>/TiO<sub>2</sub> nanocomposites
can be easily and strongly affixed onto textiles using the layer-by-layer
deposition method. Ultrathin SnS<sub>2</sub> nanosheets were associated
with anatase TiO<sub>2</sub> nanofibers to form nano-heterojunctions
with a tight interface, considerably increasing the photo-oxidative
activity of anatase TiO<sub>2</sub> due to the beneficial interfacial
transfer of photogenerated charges and increased oxidizing power.
Moreover, it is easy to process the material on a larger scale and
to regenerate these functionalized textiles. Our findings may aid
the development of functionalized clothing with solar light-activated
photocatalytic properties that provide a high level of protection
against chemical warfare agents
Titania-Decorated Silicon Carbide-Containing Cobalt Catalyst for FischerāTropsch Synthesis
The metalāsupport interactions of titanium dioxide
decorated
silicon carbide (Ī²-SiC)-supported cobalt catalyst for FischerāTropsch
synthesis (FTS) were explored by a combination of energy-filtered
transmission electron microscopy (EFTEM), <sup>59</sup>Co zero-field
nuclear magnetic resonance (<sup>59</sup>Co NMR), and other conventional
characterization techniques. From the 2D elemental maps deduced by
2D EFTEM and <sup>59</sup>Co NMR analyses, it can be concluded that
the nanoscale introduction of the TiO<sub>2</sub> into the Ī²-SiC
matrix significantly enhances the formation of small and medium-sized
cobalt particles. The results revealed that the proper metalāsupport
interaction between cobalt nanoparticles and TiO<sub>2</sub> led to
the formation of smaller cobalt particles (<15 nm), which possess
a large fraction of surface atoms and, thus, significantly contribute
to the great enhancement of conversion and the reaction rate. The
cobalt time yield of the catalyst after modification increased to
7.5 Ć 10<sup>ā5</sup> mol<sub>CO</sub> g<sub>Co</sub><sup>ā1</sup> s<sup>ā1</sup> at 230 Ā°C, whereas the
C<sub>5+</sub> selectivity maintained a high level (>90%). In addition,
the adequate meso- and macro-pores of the SiC-based support facilitated
intimate contact between the reactants and active sites and also accelerated
the evacuation of the intermediate products. It was also worth noting
that a superior and stable FTS specific rate of 0.56 g<sub>C<sub>5+</sub></sub> g<sub>catalyst</sub><sup>ā1</sup> h<sup>ā1</sup> together with high C<sub>5+</sub> selectivity of 91% were obtained
at common industrial content of 30 wt % cobalt