UV photolysis kinetics of sulfonamides in aqueous solution based on optimized fluence quantification

Lian, Junfeng; Qiang, Zhimin; Li, Mengkai; Bolton, James R.; Qu, Jiuhui

doi:10.1016/j.watres.2015.02.026

Cited by 72 publications

(27 citation statements)

References 23 publications

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“…The pH dependence of F might result from the acidbase speciation of excited-state species or from acid-catalyzed deactivation of photolysis intermediates. Meanwhile, the F values of RNTD and NZTD were higher than those of carbamazepine (Wols and Hofman-Caris, 2012), naproxen (Pereira et al, 2007), and 2,4-dichlorophenoxyacetic acid (Chu, 2001), while lower than those of diclofenac (Shu et al, 2013) and sulfamethoxazole (Lian et al, 2015), indicating a moderate UV photolysis rate of RNTD and NZTD. With these rate constants, the apparent transformation kinetics of the RNTD and NZTD can be determined for any water/wastewater pH, providing an estimate of baseline removal by UV photolysis.…”

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confidence: 88%

Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

et al. 2017

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a b s t r a c tThis study investigated the degradation kinetics and halonitromethanes formation potential (HNMsFP) of two nitro-based pharmaceuticals (i.e., ranitidine (RNTD) and nizatidine (NZTD)) during ultraviolet (UV) photolysis. It was found that the degradation kinetics of RNTD and NZTD exhibited pH-dependent trends, in accordance with their deprotonation equilibria. The neutral species of RNTD and NZTD were more photo-reactive than their corresponding deprotonated species, with their specific fluence-based firstorder rate constants varying in the range of 5.64e31.90 m 2 E À1. Both the RNTD and NZTD were prone precursors of HNMs (with molar yields of 5.6± 0.3% and 4.7± 0.4%, respectively at pH 7.0). Acidic and neutral circumstances facilitated the HNMs formation. The UV photolysis of RNTD and NZTD could reduce their HNMsFP simultaneously. Positive linear relationships between residual RNTD or NZTD concentration and HNMsFP were observed and the denitration during the UV photolysis accounted for the HNMsFP reduction. With the mandatory UV disinfection fluences in China (i.e. 20e80 mJ cm À2 ), the effective abatement of RNTD and NZTD and their HNMsFP could not be fully achieved, highlighting the necessity of increasing UV fluence or developing UV-based advanced oxidation process in future.

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Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

et al. 2017

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“…The involvement of both processes in surface-water conditions has been shown for cephalosporins (Xu et al, 2011;Wang and Lin, 2012) and other antibiotics (Li et al, 2011(Li et al, , 2014Lian et al, 2015;Niu et al, 2013). In direct photolysis, a xenobiotic undergoes transformation triggered by sunlight absorption (Pace and Barreca, 2013).…”

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confidence: 99%

A model assessment of the importance of direct photolysis in the photo-fate of cephalosporins in surface waters: Possible formation of toxic intermediates

et al. 2015

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“…It was found that SA removal may be different from other "common" pollutants such as TN,TP and metals. Photolysis appears to be the main degradation process of SAs in natural waters (Andreozzi et al 2003), whereas direct photolysis, indirect photolysis and self-sensitized photolysis of antibiotic pollutants are common in surface waters exposed to sunlight (k > 290 nm) Lian et al 2015). Forni et al (2001) found that the fern plant Azolla has the ability to remove antibiotic sulfamonomethoxine in aqueous solution, and the degradation rate reached 55.7% after 5 weeks.…”

Section: Effects Of Sulfonamide On Nutrient Removal Of V Natansmentioning

confidence: 99%

Removal of nutrients from water column and physiological responses of Vallisneria natans under sulfonamide stress

Zhu

Wang

et al. 2019

Journal of Freshwater Ecology

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For a better understanding of the metabolic adaptations to sulfonamide (SA) stress in submerged macrophytes, the alterations of nutrient element uptake and secondary metabolism were studied in the leaves of Vallisneria natans (Lour.) Hara exposed to 0 and 50 mg/L of SA for 15 d. The results showed that, under a treatment of 50 mg/L SA, the malondialdehyde and superoxide anion (O 2 À) contents in V. natans leaves significantly increased, 1.77-3.32 times higher than the control group, respectively, while the chlorophyll concentration showed a 36.99% reduction at the end of experiment. Simultaneously, V. natans showed a removal effect on SA and SA dramatically affected the nutrient removal efficiency by V. natans. Our results suggest that high SA levels can damage V. natans tissue and in turn that results in a stimulation of the antioxidant response. V. natans significantly improved the removal efficiency of SA, meanwhile SA resulted in less removal of TN and TP from the water column.

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UV photolysis kinetics of sulfonamides in aqueous solution based on optimized fluence quantification

Cited by 72 publications

References 23 publications

Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

Degradation of nitro-based pharmaceuticals by UV photolysis: Kinetics and simultaneous reduction on halonitromethanes formation potential

A model assessment of the importance of direct photolysis in the photo-fate of cephalosporins in surface waters: Possible formation of toxic intermediates

Removal of nutrients from water column and physiological responses of Vallisneria natans under sulfonamide stress

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