The Photodegradation Effect of Organic Dye for Metal Oxide (Cr₂O₃, MgO and V₂O₃) Treated CNT/TiO₂Composites

Abstract

Three kinds of organometallic compounds (chromium acetylacetonate, magnesium acetate and vanadyl acetylacetonate) were used as transition metal precursor, titanium n-butoxide and multi-walled carbon nanotube as titanium and carbon precursor to prepare metal oxide-CNT/TiO 2 composites. The surface properties and morphology of metal oxide-CNT/TiO 2 composites were by Brauer-Emett-Teller (BET) surface area measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis. The photocatalytic activity of prepared metal oxide-CNT/TiO 2 composites was determined by the degradation effect of methylene blue in an aqueous solution under irradiation of visible light.

In Situ Preparation of VO2 Films with Controlled Ionized Flux Density in HiPIMS and Their Regulation of Thermal Radiance

“…The peaks at 55.5, 57.4, and 70.3°, in accordance with the reflections from planes (220), (022), and (−231) of VO 2 (M) that appear in 1.7B and 1.7C, when the ionized flux density increases. , Moreover, the diffraction peaks at 26.7 and 39.7°, which match the reflections from planes (−120) and (015) of V 4 O 7 , can be observed in 1.7C when ionized flux density continues to increase. , For samples deposited at ionized fluxes density of 1824 and 2738 μC in Figure S2a of the Supporting Information, a former diffraction peak of 12.4° cannot match the reflection plane because of diversity of vanadium oxides. The latter diffraction peak can be observed at 33.0 and 53.9°, and they match the reflections from planes (104) and (116) of V 2 O 3 . , Therefore, the intensity of the diffraction peaks becomes stronger with the ionized flux density increasing, indicating that the crystallinity of samples becomes better with ionized flux density increasing.…”

Double Walled Carbon Nanotube/TiO2 Nanocomposites for Photocatalytic Dye Degradation

“…Photocatalytic evaluation of the nanocomposites showed the highest activity for the NC-3 (Figure 8(a)). Initially there was an increase in degradation efficiency with increasing [30][31][32]. DWCNTs themselves can also absorb photons, get excited, and inject electrons into the TiO 2 conduction band, triggering the formation of highly reactive superoxide and hydroxyl radicals [33].…”

Removal and Adsorption of p‐Nitrophenol from Aqueous Solutions Using Carbon Nanotubes and Their Composites

“…Analysis. We collected the absorption at different concentration of PNP and drew a diagram (Figure 1(b)), which was then linearly fitted to gain the linear equation (3). The linearity of the calibration curve was rather good after correction, with a correlation coefficient ( ) of 0.99874 and 2 of 0.99698:…”

“…However, many untreated industrial effluents, such as pesticides, pharmaceuticals, wood preservatives, and petrochemicals industries, are discharged into the environment. To remove nitrophenol from contaminated water, various techniques such as membrane filtration [2], degradation [3,4], adsorption [2,5], and chemical reduction [6][7][8] have been reported. Taking advantage of high efficiency, simplicity, and low costs, adsorption is usually considered a most widely applicable technology for the removal of pollutants from aqueous solution.…”