Degradation of phenol through solar-photocatalytic treatment by zinc oxide in aqueous solution

Effective phosphated CeO2 materials in the photocatalytic degradation of phenol under UV irradiation

“…The absorption bands located at 195 and 210 nm correspond to the π → π * transitions of the aromatic ring and the absorption band at 270 nm is associated with n → π * transitions 34 . As can be seen, as the reaction progresses the intensities of the absorption bands decrease with reaction time, which indicates the degradation of the phenolic contaminant 35 . Besides, an increase in the intensity is evidenced near 240 and 286 nm as the irradiation time passes, which could be associated with the formation of intermediate species such as benzoquinone and hydroquinone, respectively 36,37 …”

“…34 As can be seen, as the reaction progresses the intensities of the absorption bands decrease with reaction time, which indicates the degradation of the phenolic contaminant. 35 Besides, an increase in the intensity is evidenced near 240 and 286 nm as the irradiation time passes, which could be associated with the formation of intermediate species such as benzoquinone and hydroquinone, respectively. 36,37 On the other hand, in the absence of photocatalyst (photolysis) a hyperchromic shift of the band located at 270 nm was observed wileyonlinelibrary.com/jctb in the UV spectrum (not shown), which is related to electronic modifications on the phenol molecule suggesting the generation of intermediates such as catechol and hydroquinones.…”

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

“…Recently, however, in-depth research in the scientific literature on the ZnO-based photocatalyst for the destruction of various pollutants in aqueous solutions shows the significant promise of this oxide for use along this direction [111]. It is noted that the creation of a "suitable" ZnO architecture during synthesis will allow minimizing the loss of the electron during excitation and maximizing the absorption of photons [151][152][153]. Among other things, its nontoxicity and ecological purity are noted, which are very important for such materials that are used for environmental purposes [111].…”

Enhanced Photodegradation of Phenol by ZnO Nanoparticles Synthesized through Sol-gel Method

“…Phenol molecules will adsorb on the active sites of ZnO surface. Thus, the high adsorption capacity at the surface is important and it promotes photodegradation (Yusoff et al 2014). Without the photocatalyst (ZnO), the photocatalytic process does not occur.…”