Photo-induced oxidation of ceftriaxone by persulfate in the presence of iron oxides.

The present study focuses on degradation and mineralization of a third generation cephalosporin antibiotic ceftriaxone (CTA) in UVA- and UVC-induced persulfate (PS) system combined with heterogeneous (α-FeO(OH) and FeO) activators. The CTA oxidation efficiency was investigated in buffered solution (pH 7.4) to stimulate the inhibitory properties of environmental and processed water matrices.

Persulfate-based photodegradation of a beta-lactam antibiotic amoxicillin in various water matrices.

Amoxicillin (AMX), a widely used beta-lactam antibiotic, belongs to the World Health Organization's list of essential medicines. This subsequently causes its long-term presence in the environment and therefore, affects different environmental compartments. In this research, the degradation and mineralisation of AMX by UVC-activated persulfate-based treatment in various aqueous media was assessed.

Oxidative degradation of emerging micropollutant acesulfame in aqueous matrices by UVA-induced HO/Fe and SO/Fe processes.

In the present study, UVA/HO/Fe and UVA/SO/Fe processes were applied to degrade the artificial sweetener, acesulfame (ACE) in ultrapure water (UW), groundwater (GW), and secondary effluent (WW). The degradation time and mineralization of 75 μM of ACE determined the efficacy of the procedures. The results indicated that the UVA-induced HO/Fe and SO/Fe systems are a promising alternative for the removal of ACE from different aqueous matrices as both studied processes completely degraded the target compound at an ACE/oxidant/Fe molar ratio of 1/10/1 and pH 3.

Effect of iron ion on doxycycline photocatalytic and Fenton-based autocatatalytic decomposition.

Doxycycline plays a key role in Fe(III)-to-Fe(II) redox cycling and therefore in controlling the overall reaction rate of the Fenton-based process (H2O2/Fe(III)). This highlights the autocatalytic profile of doxycycline degradation. Ferric iron reduction in the presence of doxycycline relied on doxycycline-to-Fe(III) complex formation with an ensuing reductive release of Fe(II).

Treatment of high-strength wastewater by Fe(2+)-activated persulphate and hydrogen peroxide.

Ferrous ion-activated persulphate and hydrogen peroxide were studied for the treatment of real high-strength industrial effluent. The Fenton process demonstrated greater organic load removal, biodegradability improvement and toxicity reduction as well as lower treatment cost than the activated persulphate system. However, the use of an activated persulphate process was more favourable due to the exothermic effect intrinsic to the Fenton reaction, which resulted in a rapid increase in the temperature of the high-strength wastewater along with excessive foam formation.