TiO₂-photocatalyzed degradation of tetracycline: kinetic study, adsorption isotherms, mineralization and toxicity reduction

Abstract

A B S T R A C TThe photocatalytic degradation of tetracycline has been investigated in aqueous solutions using TiO 2 as photocatalyst. The experiments were carried out to investigate the factors influencing the photocatalytic degradation, such as the previous adsorption in the dark, initial concentration of TC solution, TiO 2 amount, and the system toxicity during TC photodegradation. The experimental results show that adsorption is an important parameter controlling the apparent kinetic constant of the degradation. The photocatalytic degradation rate was favored by a high concentration of solution with respect to Langmuir-Hinshelwood model. The chemical oxygen demand values at the end of the treatment indicated that the percentage mineralization is a function of the initial TC concentration. The acute toxicity increased at the beginning of TC photo-oxidation, and treatment times of around 6 h are generally required for the toxicity to be lower than in the original solution.

Effects of 462 nm Light-Emitting Diode on the Inactivation of Escherichia coli and a Multidrug-Resistant by Tetracycline Photoreaction

“…Compared to the green and red light, blue light excitation provided the highest efficacy of TC degradation. To decompose TC from water, a heavy metal-based catalyst, such as TiO 2 [ 35 , 36 ], SrTiO 3 [ 37 ], ZnO [ 38 ], Fe 2 O 3 [ 39 ], and Fe 2+ or Fe 3+ /H 2 O 2 [ 40 ], are usually added and activated with UV radiation. However, heavy metals and UV radiation are hazardous to the environment and animals.…”

New Insights on the Photodegradation of Caffeine in the Presence of Bio-Based Substances-Magnetic Iron Oxide Hybrid Nanomaterials

“…Contaminants of emerging concern span a variety of chemicals comprising pharmaceuticals and personal care products (PPCPs), endocrine-disrupting compounds (EDCs), flame retardants (FRs), pesticides, and artificial sweeteners (ASWs) and their metabolites (see References [ 5 , 6 , 7 ] and references therein). Based on their harmfulness to human and environment health, there is an increasing commitment to find efficient processes for their abatement [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. A CEC abatement approach that has been proposed by several research groups is represented by the so-called advanced oxidation processes (AOPs) that exploit the generation of highly reactive species (mainly HO· radicals) to induce the oxidative degradation of the organic pollutants, until their complete mineralization is attained.…”

A hybrid process for 2,4-dichlorophenoxy acetic acid herbicidal treatment and its microbial identification by MALDI-TOF mass spectrometry

“…COD removal was a maximum where the majority of 2,4-D was eliminated and then afterwards the COD value increased and was stable, probably due to the formation of stable by-products. According to Bouafia-Chergui et al [26] the reason for incomplete removal of COD is the formation of toxic byproducts due to the photocatalytic treatment. Since the second stage of this study was going to be a biological treatment, oxidizable organic content was important to investigate.…”