Degradation of Oxytetracycline in Aqueous Solutions: Application of Homogeneous and Heterogeneous Advanced Oxidative Processes

Abstract

Oxytetracycline is one of the antibiotics most frequently used in the Shrimp Industry during the control of bacterial diseases. These emerging pollutants, which appear in low concentrations, are persistent and alternative treatments and are required for their elimination. The degradation of oxytetracycline was evaluated in an aqueous solution by applying homogeneous (UV/H2O2 and photo-Fenton) and heterogeneous (UV/TiO2/H2O2) advanced oxidative processes (AOPs). The studies were carried out using a bench reactor with short-wave ultraviolet lamps (UV-C). We quantified the extent to which the degradation of the drug had been efficient by employing highly efficient liquid chromatography (HPLC) and a PDA detector with a wavelength of 354 nm and a C18 column. The best results were obtained when applying the UV/H2O2 treatment, which attained a degradation of 97% under the initial conditions of a dose of 8 µL of H2O2 and 120 min of radiation. The pseudo-first order kinetic model proposed by Chan and Chu showed that the experimental results had an adequate fit, with values greater than R2 ≥ 0.95. Toxicity tests were applied to verify the effect of AOPs employed, when the drug was present in low concentrations. The test results demonstrated a decrease in the root growth of the species Lactuca sativa and Daucus carota.

Degradation of Blue 1 and Yellow 6 Dyes in Binary Mixture Using Photo-Fenton/Sunlight System: Optimization by Factorial Designs

“…In this study, the kinetic model presented a good fit to the experimental data, represented by the coefficients of determination R 2 > 0.95 (Table 1). This kinetic model has also been used satisfactorily by other authors for the degradation of dyes in aqueous media (do Nascimento et al, 2018(do Nascimento et al, , 2020Giler-Molina et al, 2020;Santana et al, 2019Santana et al, , 2021.…”

“…Toxicity tests were performed using lettuce seeds of the Lactuca sativa variety as performed by Giler-Molina et al (2020). This germination bioassay study was developed to evaluate the toxicity of the treatment.…”

“…Homogeneous (Fenton reaction, photoassisted Fenton reaction, H 2 O 2 /UV, O 3 /UV treatment, etc.) and heterogeneous (photocatalysis mediated by semiconductors such as TiO 2 ) advanced oxidation systems have been widely used for a variety of treatments of refractory, toxic, hazardous organic and inorganic pollutants (de Almeida et al, 2021;Deng & Zhao, 2015;Díaz-Rodríguez et al, 2020;Gautam et al, 2019;Giler-Molina et al, 2020;Muruganandham & Swaminathan, 2006;Navia-Mendoza et al, 2021;Peternel et al, 2012;Rubio-Clemente et al, 2015;Santana et al, 2021;Tisa et al, 2014).…”

Advances in the Application of Nanocatalysts in Photocatalytic Processes for the Treatment of Food Dyes: A Review

“…However, in later years, their applicability mostly focused on oxidative treatments to different wastewaters. Thus, it was considered a new alternative for the elimination of organic pollutants classified as bio-recalcitrant and for the inactivation of pathogenic microorganisms that were difficult to treat by conventional methods [51][52][53][54][55].…”

Ultrafiltration Membranes System: A Proposal to Remove Emerging Pollutants in Urban Wastewater

“…), adsorption (powdered activated carbon (PAC) or granular activated carbon (GAC)), or advanced oxidation processes (UV/TiO2, photo-Fenton, etc.) are currently being investigated [11][12][13][14]. However, most of these technologies are not widely used, mainly due to high costs, which makes their implementation in WWTPs difficult.…”