Photodegradation of bisphenol A in Fe(III)-oxalate complexes solution.

The aqueous photodegradation of bisphenol A (BPA) in the presence of Fe(III)-oxalate complexes (Fe(III)-Ox), which are common compositions of natural water, was investigated in this study. BPA underwent rapid indirect photolysis in Fe(III)-Ox solution under simulated solar irradiation, proceeding pseudo-first-order kinetics. The photolysis rate increased with decreasing pH or initial BPA level and increasing Fe(III)/oxalate concentration ratio.

[Photodegradation of bisphenol A in presence of Suwannee River fulvic acid].

Under simulated solar irradiation, the degradation of bisphenol A (BPA) was studied in the presence of Suwannee River Fulvic Acid (SRFA). The results demonstrate that the photodegradation of BPA followed a pseudo-first-order kinetics and the photodegradation rate increased rapidly with increasing initial concentration of SRFA. Hydroxyl radical, singlet oxygen were found in the SRFA solutions of BPA with molecular probes and the technique of electronic spin resonance.

Determination of hydroxyl radicals with salicylic acid in aqueous nitrate and nitrite solutions.

The qualitative and quantitative analyses of reactive oxygen species are essential to determine their steady-state concentration and related reaction mechanisms in environmental aquatic systems. In this study, salicylic acid was employed as an innovative molecular probe of hydroxyl radical(OH) generated in aqueous nitrate and nitrite solutions through photochemical reactions. Kinetic studies showed that the steady-state concentrations of OH in aqueous NO3- (10 mmol/L, pH = 5) and NO2- (10 mmol/L, pH = 5) solutions under ultraviolet irradiation were at a same magnitude, 10(-15) mol/L.