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Electrochemical oxidation of paraben compounds and the effects of byproducts on neuronal activity

handle: 10316/105937 , 10419/243841
Some organic recalcitrant compounds are not degraded by conventional water treatment systems, making necessary the use of advanced technologies to eliminate these substances. Advanced Oxidation Processes (AOPs) have been extensively proposed to remove emerging contaminants aiming potable water reuse, but literature barely addresses neurotoxic effects of AOPs residual byproducts. These processes involve high costs associated with the electricity, maintenance and oxidizing agent used. However, electrochemical AOPs are techniques based on electron transfer, thus being a clean form of energy and very efficient in the degradation of organic pollutants. Parabens are naturally found in plant sources but most are chemically synthesized, requiring careful treatment to not disturb the environment. In this study, a mixture of parabens (10 mg L−1 each) was degraded by an electrochemical oxidation (EO) system with a Ti/Pt anode. Some parameters, such as the current density (25, 75 and 125 A m−2) and the electrolyte type and concentration (1.5, 3.0 and 5.0 g NaCl L−1 and 3.0 g Na2SO4 L−1) were changed. The best results were obtained with 125 A m−2 and 3.0 g NaCl L−1, which led to the complete degradation of the parabens present in the mixture, after 10 min. In addition to these studies neurotoxicity tests were also performed using the solutions of interest, before and after the EO treatment. It was observed, using the reactive oxygen species (ROS) fluorescent indicator H2DCFDA, that the non-treated solution caused an increase in ROS formation with a signal amplitude of 0.84 ± 0.20 above the baseline. After the EO process the parabens mixture did not lead to a significant ROS change.The solution to bridge the problem of high electricity costs may be replacing it with solar energy, low cost catalysts and other treatment processes involving renewable and eco-friendly energy. Keywords: Bioenergy, Advanced oxidative process (AOPs), Contaminants of emerging concern (CECs), Hippocampal slices, Neurotoxicity, Reactive oxygen species (ROS)
- University of Arizona United States
- Oswaldo Cruz Foundation Brazil
- Federal University of Rio de Janeiro Brazil
- Federal University of Rio de Janeiro Brazil
- Lodz University of Technology Poland
ddc:330, Reactive oxygen species (ROS), Hippocampal slices, Advanced oxidative process (AOPs), TK1-9971, Contaminants of emerging concern (CECs), Neurotoxicity, Bioenergy, Electrical engineering. Electronics. Nuclear engineering
ddc:330, Reactive oxygen species (ROS), Hippocampal slices, Advanced oxidative process (AOPs), TK1-9971, Contaminants of emerging concern (CECs), Neurotoxicity, Bioenergy, Electrical engineering. Electronics. Nuclear engineering
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).14 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10%
