Faculty of Humanities and Sciences

Permanent URI for this communityhttps://rda.sliit.lk/handle/123456789/4205

Browse

Filters

2019 - 201912020 - 20212

Advanced Search

Filter by

Settings

Author: search.filters.author.Mirihana, S

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    PublicationOpen Access
    Porous carbon materials in biomedical applications
    (2019-11-12) Thambiliyagodage, C. J; Mirihana, S; Gunathilaka, H
    Recent advances in carbon based porous materials in biomedical science and technology have been discussed. Biomedical applications like drug delivery, tissue engineering, biomedicine, gene transfection, photothermal and photo-dynamic theory of porous carbon materials such as mesoporous carbon materials, carbon nanotubes, activated carbon, graphene and fullerenes have been briefed. Finally, future biomedical applications of new porous carbon materials including metal organic frameworks, carbon dots have been introduced in this mini review.
  • Thumbnail Image
    PublicationOpen Access
    Fabrication of Fe2TiO5/TiO2 binary nanocomposite from natural ilmenite and their photocatalytic activity under solar energy
    (Elsevier, 2021-01-01) Thambiliyagodage, C. J; Mirihana, S; Wijesekera, R; Madusanka, D. S; Kandanapitiye, M; Bakker, M
    Heterogeneous photocatalysis is an attractive alternative route to enhance the degradation of environmental pollutants. In this work, we have fabricated Fe2TiO5/TiO2 binary nanocomposites using natural ilmenite via bottom up approach. Synthesized nanocomposites were characterized by X-ray diffractometry, X-ray fluorescence, transmission electron microscopy, Raman spectroscopy, diffuse reflectance UV–Visible spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. These nanoparticles are in the range of 40–70 ​nm and are of type I heterostructure with a band gap of 2.02 ​eV. They are sensitive to visible light and show higher photocatalytic activity under direct solar energy. Photocatalytic activity of Fe2TiO5/TiO2 was assessed using a model textile dye, methylene blue. Over a period of 2 ​h, 76% of methylene blue was photodegraded at a rate of 0.0084 min−1 in the presence of Fe2TiO5/TiO2.
  • Thumbnail Image
    PublicationOpen Access
    Photocatalytic activity of Fe and Cu co-doped TiO2 nanoparticles under visible light
    (Springer US, 2021-07) Thambiliyagodage, C. J; Mirihana, S
    The photocatalytic activity of single transition metal-doped TiO2 nanoparticles is well established. This article reports the synthesis of Fe and Cu co-doped TiO2 nanoparticles with varying Fe and Cu concentrations by the sol–gel method and their photocatalytic activity towards photodegradation of methylene blue under visible light. Nanoparticles were characterized by X-ray diffractometry (XRD), Raman spectroscopy, Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF), and Diffuse reflectance UV–Visible spectroscopy. XRD patterns revealed the existence of both anatase and rutile phases which was confirmed by Raman and TEM analysis. Both XRD and Raman analysis confirmed the successful doping of Fe and Cu without causing any significant lattice distortions. Nanoparticles were aggregated as shown in TEM and SEM images. XPS analysis revealed the presence of the only Ti4+ in pure TiO2 while both Ti4+ and Ti3+ were present in doped TiO2 in addition to Fe3+, Cu+, and Cu2+. XRF analysis showed the presence of only Ti, Fe, and Cu in the co-doped nanoparticles. According to the diffuse reflectance spectroscopic analysis, the visible light sensitivity of TiO2 has increased upon doping with Fe and Cu. Single metal-doped nanoparticles were efficient than the co-doped nanoparticles for the degradation of methylene blue under visible light. Among the single doped nanoparticles, 0.05 Cu/TiO2 showed the highest rate constant (0.0195 min−1) while the maximum activity from the co-doped nanoparticles resulted in 0.05 Cu + 0.05 Fe/TiO2 (0.0098 min−1). The photocatalytic activity was decreased upon increasing the dopant (Fe/Cu) concentration due to the recombination of photogenerated electron-hole pairs, while due to the shielding effect, low photocatalytic activity resulted in co-doped nanoparticles with varying Fe and Cu loadings.