Role of wetland organic matters as photosensitizer for degradation of micropollutants and metabolites

Photolysis of the antidepressants amisulpride and desipramine in wastewaters: Identification of transformation products formed and their fate

“…For instance, amisulpride contains a sulfonyl group and an aromatic amine, as does the sulfonamide antibiotic sulfamethoxazole, which also previously showed high degradation rates during direct photolysis (Lee et al, 2014). On the other hand, it has been demonstrated that aromatic amines, common in sulfonamide antibiotics, are likely to covalently cross-couple to natural organic matter, decreasing their occurrence in environmental water samples (Bialk et al, 2005; Garcia-Galan et al, 2012).…”

“…Higher adsorption onto organic matter would lead to a faster removal in wastewater, but lower adsorption of more polar compounds could lead to a decrease in the removal rates in wastewater samples. For desipramine, however, its core structure is similar to carbamazepine, whose degradation rates were found to be low during direct photolysis, but degradation was enhanced by indirect photolysis (Lee et al, 2014;Matamoros et al, 2009;Luciano et al, 2012).…”

Effects of dissolved organic matter on phototransformation rates and dioxin products of triclosan and 2′-HO-BDE-28 in estuarine water

“…This study revealed the roles of SRNOM on the photochemical transformation of 31 HO-PXDEs and the photochemical formation and degradation of dioxins, which is 32 Introduction 36 Hydroxylated polyhalodiphenyl ethers (HO-PXDEs), such as the widely used 37 antimicrobial 2'-HO-2,4,4'-trichlorodiphenyl ether (triclosan) and hydroxylated 38 polybromodiphenyl ethers (HO-PBDEs), have attracted much attention for their 39 ubiquitous presence in the environment and toxicity to biological systems. 2 It is of great significance to understand their transformation 45 behavior, which determines the environmental persistence of these compounds. In the U.S. streams, a 41 concentration up to 2.3 µg L −1 for triclosan was reported, 3 and in estuarine water of the German Bight, the concentration of dissolved triclosan was reported to be 0.8 -6870 pg 43 L −1 .…”

Factors affecting formation of deethyl and deisopropyl products from atrazine degradation in UV/H2O2 and UV/PDS

“…33 In addition, previous studies have been reported that NOM as a photosensitizer can lead to the photochemical formation of various reactive intermediates such as singlet oxygen ( 1 O 2 ), peroxy radical (ROOc), and 3 DOM* in direct UV photolysis, and these species are considerably reactive toward organic contaminants such as atenolol, carbamazepine, and glimepiride. 37 In our previous work, the inuence of water constituents (i.e., HCO 3 2À / CO 3 2À , Cl À , and NOM) on ATZ degradation kinetics have been investigated, and these factors on the relative contributions of HOc and SO 4 c À in UV/PDS and UV/H 2 O 2 processes have been evaluated. 16 However, the effects of various water constituents on the formation of primary products (i.e., DEPs and DIA) from ATZ are still unknown.…”