Photoelectrocatalysis for Water Purification

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

“…7b). Since strong adsorption of NO 2 is observed in the dark, it is plausible that in our conditions the loss of surface area for the thermally treated samples (Table 1) can offset the higher amount of OHÁ radicals [32].…”

“…The experimental set up for the NO x abatement has been reported in previous papers [32,33]. A certain concentration of NO x was introduced with air in a large volume chamber and after mixing, the gaseous mixture was allowed to circulate through the reaction chamber in the dark, and analysed at established time intervals.…”

Effect of Metal Substrate on Photo(electro)catalytic Activity of B-Doped Graphene Modified TiO2 Thin Films: Role of Iron Oxide Nanoparticles at Grain Boundaries of TiO2

“…Their use is still limited by fast charge-carrier recombination, low photon-to-current-conversion efficiency (IPCE), large band-gap energy (>3 eV), and different interfacial charge-transfer rates . To overcome these limitations, nanocrystalline TiO 2 electrodes are modified by adding other components to produce surface or bulk modification. − Thus, for instance, photovoltaic and photocatalytic properties of TiO 2 can be enhanced by incorporating reduced graphene oxide rGO sheets. − The great mobility of charge carriers in rGO improves charge separation, facilitating transportation of electrons in the photoanode and hence their collection to generate photocurrent. On other hand, doping is an effective way of modifying the electronic properties of TiO 2 , enhancing the visible light response, and promoting the separation of charges. − Boron is an interesting dopant of TiO 2 because, besides showing PEC activity in the visible light region, it can improve its UV activity …”

“…To fabricate photoanodes based on TiO 2 thin films, nanomaterials must be deposited or grown on conducting substrates, using either metal or conductive glass supports. − Excluding TiO 2 layers grown directly on a bulk titanium foil by selective etching and/or oxidation, ,,, a critical factor that impacts the fabrication, evaluation, and performance of photoanodes is the choice of an appropriate substrate. Several materials have been found as suitable to support photoactive TiO 2 thin films. ,, However, selection of an appropriate substrate can be challenging because not only the manufacture or performance but also economic criteria must be taken into account.…”

“…Preparation of TiO 2 nanoparticle films by sol–gel and some wet chemical coating technique is the most common way to synthesize semiconductor thin film electrodes. − , This offers advantages over other immobilization methods. It can be a simple and cost-efficient coating option, for instance, in the handling of large complex shaped substrates and due to low annealing temperatures for postcoating treatment .…”