Procesos de oxidación avanzada en el ciclo integral del agua

Abstract

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Kinetics of Decolorization of Reactive Textile Dye via Heterogeneous Photocatalysis Using Titanium Dioxide

“…When exposed to sufficient energy equal to or greater than the "gap"-the interval between the valence and conduction bands-electrons can transition from the valence band to the conduction band. This transition involves overcoming an energetic distance known as the forbidden band (Eg) and simultaneously creating an electronic vacancy or "hole" in the valence band [10]. Figure 1 illustrates the bandgap energies of different semiconductors, expressed in both electronvolts (eV) and volts relative to the potential of the normal hydrogen electrode ENHV [11,12].…”

“…Most studies have focused on TiO2 [13][14][15] despite its limitations, such as its low efficiency and low response to light due to its bandwidth of 3.2 eV, which corresponds to light <400 nm [10,16]. The semiconductor TiO2 plays an important role as an active photocatalyst mainly due to its photoinduced effect and electron transfer properties.…”

“…The main reactions that occur in the decontamination process of water containing organic substances in contact with a semiconductor in the presence of solar radiation UV [18][19][20][21] are shown through reactions ( 1)- (11). Most studies have focused on TiO 2 [13][14][15] despite its limitations, such as its low efficiency and low response to light due to its bandwidth of 3.2 eV, which corresponds to light <400 nm [10,16]. The semiconductor TiO 2 plays an important role as an active photocatalyst mainly due to its photoinduced effect and electron transfer properties.…”