Activation of persulfate by irradiated laterite for removal of fluoroquinolones in multi-component systems

Abstract

Although several emerging contaminants (e.g. fluoro(quinolones) (FQs)) have been simultaneously detected in environmental systems, there is very limited information on their elimination from contaminated waters in multi-component systems. In this study, removal of three FQs including flumequine (FLU), ciprofloxacin (CIP) and norfloxacin (NOR) were investigated in single and mixture systems, using natural laterite soil and persulfate (PS) under UVA irradiation. Both sorption and oxidation reactions contribute to the removal of FQs from aqueous phase, whereas quenching experiments showed that SO is mainly responsible for the FQs oxidation. The kinetic rate constants can be ranked as follows: CIP > NOR > FLU, regardless of whether the compound was alone or in mixture. The higher degradation rate constant of CIP relative to those of NOR and FLU could be explained by the high reactivity of SO radical with cyclopropane-ring containing compounds. Fall in oxidation performance was observed in synthetic wastewater, probably due to sulfate radical scavenging by wastewater components. However, degradation rate constants of CIP in wastewater remains unchanged in mixture systems as compared to single ones. This environmentally friendly remediation technology may appear as a promising way for the removal of fluoroquinolone antibiotics from multi-contaminated waters.

Removal of Emerging Pollutants from Water Using Environmentally Friendly Processes: Photocatalysts Preparation, Characterization, Intermediates Identification and Toxicity Assessment

“…In order to improve removal of pollutants, (NH 4 ) 2 S 2 O 8 was added in two concentrations (0.125 and 0.5 mM) to the reaction mixtures, consisting of emerging pollutant and the catalyst, which showed the highest removal efficiency. As mentioned, in the presence of (NH 4 ) 2 S 2 O 8 it can be expected increased removal of pollutants because of the photochemical activation of (NH 4 ) 2 S 2 O 8 , resulting in sulfate radical anions [44].…”

Photocatalytic degradation of binary and ternary mixtures of antibiotics: reactive species investigation in pilot scale

“…Other AOPs such as electro-Fenton [14], UV photolysis and UV/H2O2 [15] processes were employed to the degradation and the mineralization of ciprofloxacin, and the transformation of some antibiotics shows different structural classes. Recently, Kamagate et al [16] reported that some antibiotics such as flumequine, norfloxacin and ciprofloxacin could be degraded simultaneously by heterogeneous photo-Fenton process using laterite as catalyst. In the case of photocatalysis, most of the researchers have assessed the performance of removal within mono-compound systems [17][18][19].…”

Improved electrochemical oxidative degradation of Reactive Red 24 dye by BDD anodes coupled with nitrate: operating parameters, kinetics, and degradation pathways

“…TBA and MeOH are used as scavengers for •OH and SO4• - (Zhang et al, 2013). Methanol can remove • OH and SO4• -very quickly, but TBA is relatively inert to SO4• - (Kamagate et al, 2018). Similarly, phenol can also remove •OH, SO4• -and NO3•.…”