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[en] Highlights: • Dispersible Fe3O4 were coated with SiO2 and C to prepare Fe3O4/SiO2/C nanospheres (FSCNS). • FSCNS showed high catalytic activity for Fenton-like reaction in the pH range of 4–9. • The radicals in the Fenton-like reaction were used to decolorize cationic dye methylene blue. • FSCNS could be easily washed for regeneration after the Fenton-like reaction.
[en] Highlights: • Anionic polyacrylamide-assisted hydrothermal route was used as novel surface inhibitor to produce carbon spheres. • Monodispersed and uniform carbonaceous spheres with high starting glucose concentration were obtained. • Surface modification with alkaline can enhance the adsorptive capability of spheres.
[en] In the present paper, we have investigated the effects of reaction temperature and duration of reaction on the properties of hydrothermally derived nano-crystalline Cu2SnSe3 (CTSe) powder. We report here for the first time, the morphology dependent photocatalytic performance of CTSe nanocrystals, which was analyzed by monitoring the photo-degradation of methylene blue (MB) dye under visible light irradiation. The reaction temperature and time was found to greatly influence the morphology of the nano-crystals, which consisted of flakes, discs or sheets in the nanometer range, depending upon the experimental conditions. Nanoflakes with rough surfaces degrade 73% of the dye in 3 h of light irradiation thus showing that highly crystalline CTSe nanocrystals having rough surfaces have the highest photocatalytic activity. (paper)
[en] Linear light polarizing films selectively transmit radiations vibrating along an electromagnetic radiation vector and selectively absorb radiations vibrating along a second electromagnetic radiation vector. It happens according to the anisotropy of the film . In the present study the polarization effects of methylene blue sensitized polyvinyl alcohol is investigated. The polarization effects on the dye concentration, heating and stretching of film also are evaluated
[en] Graphitic g-C3N4-WO3 composite was synthesized simply by decomposing melamine in the presence of WO3 at 500 .deg. C. The obtained material was characterized by XRD, SEM, IR and XPS. The results showed that the as-prepared composite exhibits orthorhombic WO3 phase coated by g-C3N4 and the g-C3N4 decomposed completely with N-doped WO3 remaining at elevated calcination temperatures. The photocatalytic activity of the composite was evaluated by the photodegradation of methylene blue under visible light. An enhancement in photocatalytic activity for the graphitic g-C3N4-WO3 composite compared to the conventional nitrogen-doped WO3 was observed, which can be attributed to the presence of g-C3N4 in the material
[en] Invading melanoma spreads to local and unpredictable distant location at the early stages of its development. It is justifiable, therefore to classify the disease as a systemic disorder. This requires a systemic treatment that reaches all melanoma cells irrespective of whether they are singly dispersed and in circulation or already forming solid tumours of various sizes. Targeted radiotherapy affects directly and selectively cancer cells provided an appropriate radionuclide and its carrier are chosen. Melanoma is a pigmented tumour. Methylene blue (MTB) accumulates selectively in melanoma cells due to its exceptionally high affinity to melanin. MTB serves, therefore, as a carrier for radionuclides. 211At-MTB has proved to be particularly effective in treating disseminated melanoma when administered systemically and, at the same time, non-toxic to normal non-pigmented and pigmented organs. (author)
[en] Highlights: • TiO2 phase control was successfully synthesized by surfactant-assisted method. • Micelle formation illustrates TiO2 polymorph formation of surfactant templates. • TiO2 60:40, anatase/rutile gave a high methylene blue degradation rate.
[en] A two-step approach has been developed to synthesize AgCl nanowires decorated with Au nanoparticles by using Ag nanowires as chemical templates. In the first step, the Ag nanowires are oxidized with FeCl3 followed by a simultaneous precipitation reaction between Ag+ and Cl- ions at room temperature, resulting in conversion of the Ag nanowires to AgCl nanowires as well as reduction of Fe3+ to Fe2+ ions. In the second step, the Fe2+ ions generated in the first step reduce Au precursors (e.g., NaAuCl4) to deposit Au nanoparticles on the surfaces of the AgCl nanowires, resulting in the formation of AgCl:Au composite nanowires. Because of strong surface plasmon resonance and chemical inertness of Au nanoparticles, the as-synthesized AgCl:Au nanowires exhibit enhanced absorption coefficient in the visible region and enhanced chemical stability to prevent them from degradation and aggregation. These unique properties enable the AgCl:Au nanowires to be used as a class of promising plasmonic photocatalysts driven by visible light. Preliminary results demonstrate these composite nanowires can efficiently decompose organics, such as methylene blue molecules, under illumination of white light.