Overlooked role of secondary radicals in the degradation of beta-blockers and toxicity change in UV/chlorine process

Pan, Yishuai; Li, Xuchun; Fu, Kun; Gu, Zhengyang; Shi, Jun; Deng, Huiping

doi:10.1016/j.cej.2019.123606

Cited by 28 publications

(16 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…•are in the 10 8 -10 9 M -1 s -1 range (Jasper et al 2016;Lei et al 2019;Pan et al 2019). These values in reaction with SO 4…”

Section: Anisolesmentioning

confidence: 99%

“…At neutral pH they have positive charge on the N-atom (p K a ≈ 9.5). The rate constants of reactions with Cl 2 •- are in the 10 8 –10 9 M -1 s -1 range (Jasper et al 2016 ; Lei et al 2019 ; Pan et al 2019 ). These values in reaction with SO 4 •- are around 1 × 10 10 M -1 s -1 , while those of reactions with CO 3 •- are in the 2 × 10 6 –5 ×10 7 M -1 s -1 range (Wojnárovits and Takács 2019 ; Wojnárovits et al 2020 ).…”

Section: Aromatic Moleculesmentioning

confidence: 99%

See 1 more Smart Citation

Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Wojnárovits

Takács

2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

Natural waters, water droplets in the air at coastal regions and wastewaters usually contain chloride ions (Cl-) in relatively high concentrations in the milimolar range. In the reactions of highly oxidizing radicals (e.g., •OH, •NO3, or SO4•-) in the nature or during wastewater treatment in advanced oxidation processes the chloride ions easily transform to chlorine containing radicals, such as Cl•, Cl2•-, and ClO•. This transformation basically affects the degradation of organic molecules. In this review about 400 rate constants of the dichloride radical anion (Cl2•-) with about 300 organic molecules is discussed together with the reaction mechanisms. The reactions with phenols, anilines, sulfur compounds (with sulfur atom in lower oxidation state), and molecules with conjugated electron systems are suggested to take place with electron transfer mechanism. The rate constant is high (107–109 M-1 s-1) when the reduction potential the one-electron oxidized species/molecule couple is well below that of the Cl2•-/2Cl- couple.

show abstract

“…•are in the 10 8 -10 9 M -1 s -1 range (Jasper et al 2016;Lei et al 2019;Pan et al 2019). These values in reaction with SO 4…”

Section: Anisolesmentioning

confidence: 99%

Section: Aromatic Moleculesmentioning

confidence: 99%

Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Wojnárovits

Takács

2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…In the presence of chlorine-containing radicals, chlorinated degradation products (DPs) may form during degradation (Gao et al 2020;Pan et al 2020;Xiong et al 2020). Chlorination takes place on the benzene/naphthalene ring or on the amino moiety.…”

Section: Photolysis Photonmentioning

confidence: 99%

“…As a result of the reaction, two chloride ions (Cl À ) are left behind plus the radical cation of the organic molecule (Hasegawa & Neta 1978). The k Cl2•À values of ATE, MET and PRO reactions are between 4 Â 10 8 and 2 Â 10 9 M À1 s À1 (Jasper et al 2016;Lei et al 2019;Pan et al 2020).…”

Section: Rate Constants Of Reactive Radicals In Reaction With β-Blockersmentioning

confidence: 99%

“…In the UV/chlorine (UV/Cl) combined treatment • OH and chlorine-containing radicals such as Cl 3). Degradation of PRO, ATE and MET was studied by UV/Cl methods (Gao et al 2020;Pan et al 2020;Xiong et al 2020) applying UV and LED light sources emitting at 254 and 275 nm, respectively. These compounds were removed completely in 20 min under the given conditions at pH 7.…”

Section: Uv/chlorine Systemmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of advanced oxidation processes for β-blockers degradation: a review

Kovács

Tóth

Wojnárovits

2021

Water Science and Technology

View full text Add to dashboard Cite

This study summarizes the results of scientific investigations on the removal of the three most-often used ß-blockers (atenolol, metoprolol and propranolol) by various advanced oxidation processes (AOP). The free radical chemistry, rate constants, degradation mechanism and elimination effectiveness of these compounds are discussed together with the technical details of experiments. In most of AOP the degradation is predominantly initiated by hydroxyl radicals. In sulfate radical anion based oxidation processes (SROP) both hydroxyl radical and sulfate radical anion greatly contributes to the degradation. The rate constants of reactions with these two radicals are in the 109–1010 M−1 s−1 range. The degradation products reflect ipso attack, hydroxylation on the aromatic ring and/or the amino moiety and cleavage of the side chain. Among AOP photocatalysis and SROP are the most effective for degradation of the three ß-blockers. The operating parameters have to be optimized to the most suitable effectiveness.

show abstract

Appraising efficacy of existing and advanced technologies for the remediation of beta-blockers from wastewater: A review

Ahmad

Priyadarshini

Raj

et al. 2022

Environ Sci Pollut Res

View full text Add to dashboard Cite

Overlooked role of secondary radicals in the degradation of beta-blockers and toxicity change in UV/chlorine process

Cited by 28 publications

References 47 publications

Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Rate constants of dichloride radical anion reactions with molecules of environmental interest in aqueous solution: a review

Evaluation of advanced oxidation processes for β-blockers degradation: a review

Appraising efficacy of existing and advanced technologies for the remediation of beta-blockers from wastewater: A review

Contact Info

Product

Resources

About