Reaction kinetics and molecular characterization of the compounds formed by photosensitized degradation of the plastic additive bisphenol A in the atmospheric aqueous phase

Gligorovski, Sasho Reaction kinetics and molecular characterization of the compounds formed by photosensitized degradation of the plastic additive bisphenol A in the atmospheric aqueous phase. Scientific Reports.

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Abstract

Bisphenol A (BPA, 4,4'-(propane-2,2-diyl)diphenol) is a common plasticizer that is very widespread
in the environment and is also found at significant concentrations in the global oceans, due to
contamination by plastics. Here we show that triplet sensitization is an important degradation
pathway for BPA in natural surface waters, which could prevail if the water dissolved organic carbon
is above 2–3 mgC L−1. Bromide levels as per seawater conditions have the potential to slow down BPA
photodegradation, a phenomenon that could not be offset by reaction of BPA with Br2
•− (secondorder reaction rate constant of (2.54±0.09)×108 M−1 s−1). Ultra-high resolution mass spectrometry
revealed that the presence of inorganic salts (NaCl and NaBr) markedly increased the complexity of the
observed CHO product compounds formed upon photosensitized degradation of BPA. The obtained
results suggest that bisphenols can be efficiently removed by photosensitized reactions and generate
higher number of oligomers and polyaromatic compounds in the sea surface and liquid water of
marine aerosols compared to freshwaters and/or dilute cloud-water. Considering that polyaromatic
compounds absorb solar actinic radiation, these results suggest that inorganic salts could significantly
affect the photosensitized degradation of bisphenols and consequently influence the light-absorbing
properties of marine aerosols and, ultimately, the Earth’s radiative balance

Item Type:	Article
Subjects:	Scientific Fields (Frascati) > Natural sciences > Earth and related environmental sciences
Divisions:	UKLO Network
Depositing User:	UKLO Mrezha
Date Deposited:	27 Jan 2025 08:48
Last Modified:	27 Jan 2025 08:48
URI:	https://eprints.uklo.edu.mk/id/eprint/10574

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