Innovative depollution treatment using multi-valent iron species: from fundamental study to application in municipal wastewater

Abstract

In this work, a new combination of oxidation treatments for the degradation of bisphenol A (BPA) is investigated. This innovative wastewater (WW) treatment includes the use of ferrate (FeO 4 2-) and its decomposition byproducts under dark and UVA irradiation. The oxidation by ferrate leads to a fast but incomplete degradation of BPA with a degradation extent of 45% after 60 minutes under adopted experimental conditions. However, the ferrate decomposition byproducts which are constituted by solid iron species can be used to further improve the pollutant degradation efficiency. Indeed, ferrate-mediated heterogeneous photo-Fenton process is employed for the first time to enhance the degradation of BPA. With respect to the application for wastewater treatment, UVA irradiation (which is part of solar light), non-toxic and natural origin compounds such as ascorbic acid (AA) and ethylenediamine-N,N'-disuccinic acid (EDDS) are used to design a sustainable process. Under optimized conditions, the degradation extent of BPA using this newly designed treatment reaches almost 100% with AA and 70% with EDDS. In order to assess the feasibility of this treatment, the ferratemediated photo-Fenton process is applied to treat municipal wastewater. The obtained results in WW are highly encouraging since a maximum BPA degradation extent of 63% and 60% is observed after 300 min by using AA and EDDS, respectively.

Contribution of photocatalytic and Fenton-based processes in nanotwin structured anodic TiO2 nanotube layers modified by Ce and V

“…54 In the presence of H 2 O 2 , HPAA formed a fluorescent dimer (catalyzed by type II peroxidase from horseradish) that was detected at λ em = 405 nm (λ ex = 320 nm). 55 Standard curves were plotted with known concentrations of hydroxycoumarin (99+%, Alfa Aesar) and H 2 O 2 to quantify the amount of generated HO • and H 2 O 2 by TNT, Ce-TNT and V-TNT under UVA irradiation (Fig. S1 †).…”

Cubic cobalt and zinc co-doped magnetite nanoparticles for persulfate and hydrogen peroxide activation towards the effective photodegradation of Sulfalene

“…As it is stated in the literature, the available impurities in the real wastewater quench the active oxidizing radicals which in turn cause the lower degradation performance [59]. Therefore, in order to not ignore the effect of these kinds of impurities on our achieved results in the ultrapure water, the same sequenced experiments were conducted for the photocatalytic degradation of 25 µM of SFL in 100 mL of the real wastewater with the characterization values presented in our previously published paper [60]. According to Fig.…”