Photosensitized degradation in water of the phenolic pesticides bromoxynil and dichlorophen in the presence of riboflavin, as a model of their natural photodecomposition in the environment

Riboflavin Phototransformation on the Changes of Antioxidant Capacities in Phenolic Compounds

“…Previous studies using RF photosensitization have been applied to remove toxic compounds including pesticides; an endocrine disrupting compound, like bisphenol A and an explosive TNT‐like compound (Zhao and others ; Yang and others ; Ha and others ). For example, phenolic pesticides, including bromoxynil and dichlorophen in water, were photo‐degraded by RF photosensitization through singlet oxygen oxidation (Escalada and others ). In addition, the degradation of gallic acid by RF photosensitization, a polymeric compound formed after lignin degradation, was accomplished by singlet oxygen, a superoxide radical anion, and hydrogen peroxide (Pajares and others ).…”

Nanomolecular singlet oxygen photosensitizers based on hemiquinonoid-resorcinarenes, the fuchsonarenes

“…These applications are largely destructive involving photoinduced deactivation of undesirable biological entities 7,8 (i.e., viruses, bacteria) and photodecomposition of environmental pollutants. 9,10 However, SO has also been used in a constructive sense, it being a highly effective reagent in chemical syntheses. 11,12 Photosensitized generation of SO underpins photodynamic therapy (PDT) where SO is generated in order to kill cancer cells.…”

Photosensitised Degradation of Organic Dyes by Visible Light Using Riboflavin Adsorbed on the Surface of TiO2Nanotubes

“…16,28 In particular riboflavin (RF) photochemistry, the precursor of all the biologically important flavins and recognised as a constituent of the vitamin B complex, has been extensively investigated. 27,[29][30][31][32][33][34][35] It was even hypothesised that water can be split photochemically with RF. 34 The photochemistry of RF involves two major reactions: (i) normal photolysis (intramolecular photoreduction) and (ii) photoaddition (intramolecular photoaddition).…”

“…37,38 Among them, the RF pigment is relevant in the sensitised photooxidation of contaminants and the kinetic mechanisms, which were recently the object of studies on O 2 ( 1 ∆ g ) generation under concentrations similar to those frequently found in nature. 29,39 Among the various methods available for the preparation of TiO 2 nanomaterials, 40 the syntheses of TiO 2 nanotubes (NTs) through the anodisation of metallic Ti surfaces has several advantages. 41 The main benefits are a simple synthetic procedure, enhanced charge transport properties, and a cost-effective scale-up process.…”