Mineralization of Azo Dye Using Combined Photo-Fenton and Photocatalytic Processes under Visible Light

Abstract

Visible-light-assisted photodegradation of an azo dye, Reactive Red 180 (RR180), in the presence of nitrogen-doped TiO 2 (N-TiO 2 ) has been studied. The photodegradation of RR180 is evaluated through decolorization studies and total organic carbon analysis. The efficacy of hydrogen peroxide (H 2 O 2 ), potassium peroxomonosulfate (oxone or PMS), and potassium peroxodisulfate (PDS) in improving the photodegradation of the dye in the N-TiO 2 -RR180 system is also examined. The effect of combining photo-Fentonlike reaction with N-TiO 2 -mediated photodegradation of RR180 under visible light has been investigated. The photoactivity of N-TiO 2 -RR180-Fe 3+ /Cu 2+ -oxidant systems is compared with the individual techniques of photocatalysis and photo-Fenton-like reactions. The coupled system possesses superior photomineralization ability towards the abatement of RR180.

Compact TiO2 films with sandwiched Ag nanoparticles as electron-collecting layer in planar type perovskite solar cells: improvement in efficiency and stability

“…S2a, ESI †) revealed the absorption edge for pristine c-TiO 2 shied from 387 nm for the single layer c-TiO 2 toward around 413 nm for the Ag NPsembedded c-TiO 2 layers, presumably due to the incorporation of Ag NPs, which is known to give UV absorption above 400 nm. 37,[44][45][46] Importantly, the TiO 2 ETL embedding Ag NPs showed stronger UV-Vis absorption compared to the pristine c-TiO 2 , which may be the result of Surface Plasmon Resonance (SPR) of Ag NPs. All the aforementioned characterizations conrmed that Ag NPs were successfully formed in between the c-TiO 2 layers.…”

Antibacterial and Biodegradable Electrospun Filtering Membranes for Facemasks: An Attempt to Reduce Disposable Masks Use

“…This result indicates the successful synthesis and attachment of Ag NPs onto PCL membranes. On the other hand, a new absorption band at approximately 380 nm, characteristic of TiO 2 NPs [41,42], is observed in the spectrum of PCL/TiO 2 NPs membranes, once again confirming the presence of these NPs onto the PCL surface. Finally, a very small absorption band seems to appear around 277 nm in the spectrum of PCL/MgO NPs when compared to the PCL spectrum, which is probably related to the presence of the MgO NPs on the membranes' surfaces [43,44].…”

Plasmon-Induced Heterointerface Thinning for Schottky Barrier Modification of Core/Shell SiC/SiO2 Nanowires

“…The enhancement could be maximized when they match the surface plasmon resonance condition of the structure. , Results show that under 800 nm wavelength laser excitation, the surface plasmon resonance can be effectively excited (Figure S7 in Supporting Information). The efficient thinning could be realized by the plasmonic absorption of the high peak energy of fs laser pulses. , If the polarization direction is perpendicular to the long axis of the NW, the electric field enhancement is not mainly focused on the SiO 2 layer at the nanowire–electrode interface, the intensity of which becomes smaller with the same incident energy (Figure S8 in Supporting Information). Except for the polarization and wavelength, the core/shell structure also contributes to the distribution of electric field.…”