The control of emerging haloacetamide DBP precursors with UV/persulfate treatment

Chu, Wenhai; Li, Dongmei; Gao, Naiyun; Templeton, Michael R.; Tan, Chaoqun; Gao, Yu-qiong

doi:10.1016/j.watres.2014.09.019

Cited by 153 publications

(38 citation statements)

References 45 publications

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“…And, Tyr-Ala formed more HANs than Ala-Tyr (Fig. 4B), which is in agreement with the recent study finding that tyrosine tert-butyl ester formed more HANs than Boc-Tyr (i.e., amino protection with a tert-butoxycarbonyl group) [27]. This is probably because the protection of the amino group in Ala-Tyr, due to the presence of peptide bonds, restrained the formation of organic chloramines by initial substitution (reaction A2 in Fig.…”

Section: Effect Of Peptide Bondssupporting

confidence: 93%

“…In recent studies, Huang et al [25] selected boc-aspartic acid and boc-asparagine as amino-protected AAs (i.e., amino protection with a tert-butoxycarbonyl group) to mimic peptide bonds. Besides, tyrosine tert-butyl ester was also selected as carboxyl-protected amino acids (i.e., carboxyl protection with a tert-butyl ester group) [26,27]. The selection of these nitrogenous precursors is helpful to differentiate the DBP formation from free AAs.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of free amino acids and short oligopeptides for the formation of trihalomethanes and haloacetonitriles during chlorination: Effect of peptide bond and pre-oxidation

Chu

Gao

et al. 2015

Chemical Engineering Journal

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Section: Effect Of Peptide Bondssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Comparison of free amino acids and short oligopeptides for the formation of trihalomethanes and haloacetonitriles during chlorination: Effect of peptide bond and pre-oxidation

Chu

Gao

et al. 2015

Chemical Engineering Journal

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“…Formation of toxic nitrogenous disinfection by-products (NDBPs) is a growing concern for water utilities using impaired source waters with wastewater effluent discharges or algal blooms due to elevated concentrations of dissolved organic nitrogen as N-DBP precursors (Fang et al, 2010;Chu et al, 2014). HNMs are one class of emerging N-DBPs in drinking water, which have drawn public concern due to their high toxicity (Bond et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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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“…* Shiqing Zhou sqzhouwater@163.com methods to degrade PPCPs, which are effective in degrading OXC because of the high oxidation ability of radicals (hydroxyl radicals and sulfate radicals) (Tan et al 2013;Chu et al 2015). Among sorts of AOPs, UV-based oxidation has potential application possibility due to its high efficiency (Tan et al 2013;Xie et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…However, an increase in PS dosage could not continuously ensure an enhancing in the target pollutant removal, because S 2 Eq. (4)(Hori et al 2005;Salari et al 2009;Chu et al 2015), which inhibits the degradation of OXC.…”

mentioning

confidence: 99%

Degradation of oxcarbazepine by UV-activated persulfate oxidation: kinetics, mechanisms, and pathways

Zhou

Shi

et al. 2015

Environ Sci Pollut Res

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The degradation kinetics and mechanism of the antiepileptic drug oxcarbazepine (OXC) by UV-activated persulfate oxidation were investigated in this study. Results showed that UV/persulfate (UV/PS) process appeared to be more effective in degrading OXC than UV or PS alone. The OXC degradation exhibited a pseudo-first order kinetics pattern and the degradation rate constants (k obs) were affected by initial OXC concentration, PS dosage, initial pH, and humic acid concentration to different degrees. It was found that low initial OXC concentration, high persulfate dosage, and initial pH enhanced the OXC degradation. Additionally, the presence of humic acid in the solution could greatly inhibit the degradation of OXC. Moreover, hydroxyl radical (OH•) and sulfate radical (SO4 (-)••) were identified to be responsible for OXC degradation and SO4 (-)• made the predominant contribution in this study. Finally, major intermediate products were identified and a preliminary degradation pathway was proposed. Results demonstrated that UV/PS system is a potential technology to control the water pollution caused by emerging contaminants such as OXC.

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The control of emerging haloacetamide DBP precursors with UV/persulfate treatment

Cited by 153 publications

References 45 publications

Comparison of free amino acids and short oligopeptides for the formation of trihalomethanes and haloacetonitriles during chlorination: Effect of peptide bond and pre-oxidation

Comparison of free amino acids and short oligopeptides for the formation of trihalomethanes and haloacetonitriles during chlorination: Effect of peptide bond and pre-oxidation

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

Degradation of oxcarbazepine by UV-activated persulfate oxidation: kinetics, mechanisms, and pathways

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