A Plug flow reactor model for UV-based oxidation of amoxicillin

Abstract

A B S T R A C TAmoxicillin was treated with UV and UV/H 2 O 2 processes, and the byproduct formation, mineralization and toxicity on Vibrio fischeri (a luminescent micro-organism) were monitored to satisfy environmental considerations. A plug flow cylindrical reactor (33 cm length and 1.75 cm radius) and a peristaltic pump (multifunctional speed pump) were used to perform the treatments. A UV lamp covered with a quartz protection was placed inside the reactor. The UV fluence rate was calculated with a chemical actinometry method, and its value was 2.3 W m −2 . The maximum removal of amoxicillin with the UV and UV/H 2 O 2 processes was achieved when the peristaltic pump speed was adjusted to 10 rpm and the H 2 O 2 concentration to 588 mg L −1 (55 and 90%, respectively). In addition, under the above-mentioned optimal conditions, the mineralization was 11 and 43% for the UV and UV/H 2 O 2 processes, respectively. A byproduct formation pathway was proposed for each process. When the flow reactor was operated in the presence of alkalinity (20.5 mg CaCO 3 L −1 ) and humic acid (5 mg L −1 ), a 50% decrease in the removal performance was observed due to the applied matrix parameters. The EC 50 % value was 76 and 36% after the UV and UV/H 2 O 2 treatments, which indicates the toxicity level of the effluents after 67 min of UV-based oxidation treatments.

Abatement of amoxicillin and doxycycline in binary and ternary aqueous solutions by gas-phase pulsed corona discharge oxidation

“…Kidak [36], who also observed a first order reaction. In the alkaline medium, the reaction is a second order reaction (plot 1/C gave the best fitting results).…”

Photocatalytically Active Supramolecular Organic-inorganic Magnetic Composites as Efficient Route to Remove <em>β</em>-lactam Antibiotics from Water

“…Thus, the degradation of the β-lactam antibiotics can follow two routes, e.g. hydroxylation and opening of the β-lactam ring [44]. The ratio between these routes is influenced by the structure of the antibiotic and the nature of the catalyst.…”

A Comparative Heterogeneous Photocatalytic Removal Study on Amoxicillin and Clarithyromicin Antibiotics in Aqueous Solutions

“…The effect of pH on photocatalytic degradation/mineralization of antibiotics is better to be evaluated in a way that consider properties of antibiotics and photocatalyst of concern at different initial pH conditions as different pKa values of antibiotics are reported to be responsible for creating varying levels of surface interaction with the TiO 2 nanoparticles in the solution [20]while surface charge status for the antibiotics and TiO 2 by order at their optimum conditions can be described as; (+/+), (-/-) and (-/-) respectively.Several authors have already reported the influence of pH on TiO 2 -mediated photocatalytic degradation of AMX and found minimal influence in the near-neutral pH range.In this study, four pH values were investigated considering the surface charge change of TiO 2 that could affect the adsorption capacity thus the photocatalytic removal of CLRT and AMX antibiotics.…”