Removal of benzoylecgonine from water matrices through UV254/H2O2 process: Reaction kinetic modeling, ecotoxicity and genotoxicity assessment

Removal of antiretroviral drugs stavudine and zidovudine in water under UV254 and UV254/H2O2 processes: Quantum yields, kinetics and ecotoxicology assessment

“…A detailed description and a scheme of the reactor can be found elsewhere [33,34] In order to produce relatively larger volumes of treated solutions, necessary to run the ecotoxicology tests, experiments were also carried out in a thermostated ( (UVC DELTA OHM radiometer). The experimental device was described elsewhere [36].…”

“…In this study the kinetics of ZDV and STV direct photolysis under UV 254 radiation and in the presence of hydrogen (UV 254 /H 2 O 2 ) was investigated in order to estimate important photo-kinetic parameters, such as the quantum yields and the second-order kinetic constant of reaction between OH radicals and the compounds, which are necessary for design and retrofitting of water treatment plants. The reaction kinetics were investigated by means of a recent developed methodology which used microcapillary photoreactor systems [33], previously adopted for the investigation of the photolytic kinetics of other micropollutants [34][35][36]. The use of this new microphotoreactor technology has been shown to be particularly suitable for the study on highly priced, hazardous, or poorly available water contaminants since it allows to run the entire experimental campaign using minimal amount of compounds, in this case less than 50 mg of ZDV and STV.…”

Kinetic Modeling of Advanced Oxidation Processes Using Microreactors: Challenges and Opportunities for Scale-Up

“…Intrinsic kinetic studies for the UVC/H 2 O 2 system in a photo-microreactor have been carried out by Russo et al in a series of papers published over the last five years [11,23,[51][52][53]. In this case, the reactor is substantially different from the one used for studies with immobilized solid photocatalysts.…”

“…Although some authors suggested the possibility of direct use of these devices for water treatment by numbering up units [25,42], this seems a fairly unrealistic and antieconomic scenario, with very few possible niche applications in the treatment of small volumes of water for specific applications. Only a limited number of papers have addressed the use of microreactors for the estimation of intrinsic parameters and mechanism identification, which can be used for the scale-up of AOPs for wastewater treatment, which, in fact, is the most promising application [9,11,12,23,[43][44][45][46][47][48][49][50][51][52][53][54]. In this sense, there is still extensive room for improvement and exploitation of this technology for the design and scale-up of such tertiary treatments.…”

Color reduction of raw sugar syrup using hydrogen peroxide

“…Hydrogen peroxide (H2O2) has a standard reduction potential (E 0 ) of 1.77 V, higher than that of other oxidants such as chlorine (E 0 = 1.36 v), chlorine dioxide (E 0 = 1.50 v), molecular oxygen (E 0 = 1.23 v) and potassium permanganate (E = 1.67 v). In a reaction medium, H2O2 can be converted to hydroxyl radicals (•OH), a highly reactive species (E 0 = 2.80 V) (Üzer et al, 2017;Mattos et al, 2013), making it of interest in the treatment of drinking water and industrial effluents (Guo et al, 2017;Russo et al, 2017;Spasiano et al, 2016). Stout et al (2017), Jervis et al (2015) and Fairbanks (2009) reported that hydrogen peroxide has been used in the bleaching of different types of food.…”