Photocatalytic degradation of tetracycline antibiotic over a flower-like S-doped BiOBr: Performance, mechanism insight and toxicity assessment

Abstract

A new catalyst of S-BiOBr flower-like morphology was synthesized by simple pyrolysis and further used for photocatalytic degradation of TC. Phase structure analysis, elemental analysis and micromorphological analysis confirmed that S doping has a reinforcing effect on the polarization between the [Bi2O2S]2+ and [Br2]2- layers and is conducive to interlayer polarization and rapid charge transfer. In addition, its unique petal morphology is more favorable to the adsorption of contaminants on its surface and accelerates the reaction of catalyst surfactant with contaminants. It was also found that S-BiOBr degrades TC significantly better than single BiOBr@HCs, with up to 99.1% in 60 min illumination. In addition, the S-BiOBr catalyst has good reusability in antibiotic degradation. The results of photocatalytic mechanism analysis show that free radical O2− plays a major role in the photodegradation of organic model pollutants. Intermediates in TC degradation were identified, and their potential degradation pathways were prospected, and the toxicity development of TC in the degradation process was analyzed by toxicity assessment software. The S-BiOBr photocatalytic system developed in this paper provides a new idea for effective modification of bismuth-based semiconductors and has important guiding significance for future water purification.

Rational Design and Evaluation of Photoactive Molecularly Imprinted Nanoparticles for Tetracycline Degradation Under Visible Light

“…Thereby, the enhanced degradation efficiency by MIN3 and MIN4 can be attributed to the specific binding of TC at molecularly imprinted cavities, minimizing the loss of oxidative potential due to ROS diffusion or deactivation. , MIN4 showed a better performance in promoting TC than MIN3 , in line with the TC rebinding capacity of these nanomaterials (Figure ). Regarding degradation products, literature reports have shown that the oxidative processes triggered by singlet oxygen and other ROS result in low molecular weight nontoxic compounds. − The proposed degradation pathways involve the oxidation of the N , N -dimethyl group into a carbonyl derivative and the subsequent removal of the amide moiety in ring A, followed by subsequent ring fragmentations. − …”

“…Regarding degradation products, literature reports have shown that the oxidative processes triggered by singlet oxygen and other ROS result in low molecular weight nontoxic compounds. 67 − 69 The proposed degradation pathways involve the oxidation of the N , N -dimethyl group into a carbonyl derivative and the subsequent removal of the amide moiety in ring A, followed by subsequent ring fragmentations. 67 − 69 …”

“… 67 − 69 The proposed degradation pathways involve the oxidation of the N , N -dimethyl group into a carbonyl derivative and the subsequent removal of the amide moiety in ring A, followed by subsequent ring fragmentations. 67 − 69 …”