Wet peroxide oxidation of catechol over copper-based catalysts: inorganic ions effect and degradation pathway of organics

Reaction Kinetics Mechanisms and Catalysis, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Language: Английский

Phycocyanin- and Polydopamine-Conjugated Titania Nanoparticles for UV Protection

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

With the increasing incidence of skin cancers each year, there is growing concern regarding ultraviolet (UV) radiation protection. However, titanium dioxide (TiO2), as a commonly used physical sunscreen agent, has certain photocatalytic activity, which can generate large amount reactive oxygen species (ROS), thus posing potential toxicity risks. Incorporating organic molecules with free radical scavenging ability to modify TiO2 effectively improve UV protection performance. In this study, PC–PDA@TiO2 composite nanoparticles were successfully prepared by coupling biomolecules phycocyanin (PC) and polydopamine (PDA) surface using simple spontaneous oxidation polymerization method. Characterization methods including scanning electron microscopy (SEM), transmission (TEM), X-ray diffraction (XRD), thermogravimetric analyses demonstrated that uniformly coated PC–PDA nanolayer have been prepared. The UV–vis diffuse reflectance spectroscopy results spin resonance (ESR) tests showed significantly increased absorption capacity reduced concentration radicals through synergistic effect PC PDA. Furthermore, in vitro assessment vivo efficiency no significant cytotoxicity high nanoparticles. These findings suggest biomacromolecule shows great promise safer material for products enhance their efficacy.

Language: Английский

New Insight into the Degradation of Sunscreen Agents in Water Treatment Using UV-Driven Advanced Oxidation Processes

Processes, Journal Year: 2024, Volume and Issue: 12(6), P. 1156 - 1156

Published: June 3, 2024

This study evaluates, for the first time, effects of UV/PMS and UV/H2O2/PMS processes on degradation sunscreen agents in synthetic natural water matrices compares their effectiveness with more conventional UV/H2O2. Investigations were conducted using a mixture organic UV filters containing 4-methylbenzylidene camphor (4-MBC) 2-ethylhexyl-4-methoxycinnamate. Among investigated UV-driven AOPs, UV/PMS/H2O2 was most effective water, while highest rate observed during EHMC by UV/PMS. The system promoted sulfate radical (68% degradation), hydroxyl contributing approximately 32%, both species contributed equally to system. Vibrio fischeri assay showed an increase inhibition (up 70%) at specific stages UV/H2O2 treatment when applied which further decreased 30%, along fluence progressive degradation. Pseudomonas putida test recorded minor toxicity (<15%) after treatments. Magnetic biochar utilized conjunction AOPs exhibited superior performance eliminating residual contaminants, providing efficient sustainable approach mitigate treatment.

Language: Английский