Photodegradation of ceftriaxone in aqueous solution by using UVC and UVC/H2O2 oxidation processes

Abstract

This study investigated the performance of UVC/H 2 O 2 and UVC processes for the degradation and mineralization of ceftriaxone as an antibiotic. The highest ceftriaxone degradation was obtained at a solution pH of 5 and H 2 O 2 concentration of 10 mg/L. The apparent rate constant of ceftriaxone degradation was found to be 0.0302, 0.0165, and 0.0065 min −1 in the UVC/H 2 O 2 process for the initial ceftriaxone concentrations of 5, 10, and 20 mg/L, respectively. Degradation and mineralization efficiencies of ceftriaxone was obtained to be 100% and 58%, respectively, in UVC/H 2 O 2 process at reaction time of 120 min, whereas only 61% and 2.5% of ceftriaxone could be degraded and mineralized by UVC. The synergistic effect of UVC/H 2 O 2 was found to be 35%. The presence of anionic species improved the photolysis efficiency which degraded ceftriaxone from 61 to 83%, while, in the UVC/H 2 O 2 process, ability degradation declined from 100 to 70%. The efficiency of UVC/H 2 O 2 and UVC process was not greatly affected in real tap water. Besides, the reduction patterns in the UVC/H 2 O 2 and UVC processes were better described by pseudo-first-and second-order kinetics model with a reaction rate constant of 0.0165 and 0.0012 min −1 , respectively. The rate constant of ceftriaxone degradation in the UVC/H 2 O 2 process and at the presence of radical scavenger was found to be around 3.3 times lower than the one in its absence.

Graphene/CuO2 Nanoshuttles with Controllable Release of Oxygen Nanobubbles Promoting Interruption of Bacterial Respiration

“…Bacterial contaminations as a serious worldwide threat endanger the health of millions of people and cause problems in several industries ranging from water treatment to food processing annually. , On the other hand, a rapid and continuous increase in the drug resistance of bacterial strains (due to the widespread abuse of antibiotics in livestock and the human health) along with the healthcare costs has drawn much global concerns to this challenge as the recent WHO report has warned . For instance, methicillin-resistant Staphylococcus aureus (MRSA), as a prevalent antibiotic-resistant bacterium, quickly spreads in public spaces such as hospital beds and induces a serious skin infection and a great risk to the public, especially those with open wounds.…”

A novel bio-electro-Fenton system with dual application for the catalytic degradation of tetracycline antibiotic in wastewater and bioelectricity generation

“…78 The H 2 O 2 concentration was analyzed using a UV-vis spectrophotometer (HACH DR5000) at 410 nm wavelength, with titanium(IV) oxysulfate as a coloured indicator (DIN 38402H15 method). 79 The concentrations of residual total ion species of Fe 2+ and Fe 3+ were achieved using the 1,10-phenanthroline method at the end of operation time. 57 The TC concentration was monitored by reversed-phase high-performance liquid chromatography (Agilent 1260 Innity HPLC) equipped with a UV-VIS detector and C18 chromatographic column (4.6 mm  100 mm, 3.5 mm) at a detected wavelength of 359 nm.…”

“… 78 The H 2 O 2 concentration was analyzed using a UV-vis spectrophotometer (HACH DR5000) at 410 nm wavelength, with titanium( iv ) oxysulfate as a coloured indicator (DIN 38402H15 method). 79 The concentrations of residual total ion species of Fe 2+ and Fe 3+ were achieved using the 1,10-phenanthroline method at the end of operation time. 57 …”

An investigation based on removal of ibuprofen and its transformation products by a batch activated sludge process: A kinetic study

“…Many methods are used for the removal of pharmaceutics from aquatic environments, such as anaerobic digestion [17], phytoremediation [18], biodegradation by pure cultures [19], moving bed biofilm reactor (MBBR) [20], and adsorption [21,22]. Also, advanced oxidation methods [23] are used, such as electro Fenton [24] and photodegradation [25]. Physicochemical methods have disadvantages such as high operating costs and the formation of secondary pollutants [26].…”