Unravelling molecular transformation of dissolved effluent organic matter in UV/H2O2, UV/persulfate, and UV/chlorine processes based on FT-ICR-MS analysis

Zhang, Bingliang; Wang, Xuening; Fang, Zhuoyao; Shu, Wang; Shan, Chao; Wei, Si; Pan, Bo

doi:10.1016/j.watres.2021.117158

Cited by 91 publications

(46 citation statements)

References 84 publications

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“…Usually, under the conditions of transition metal ions (e.g., Co 2+ and Fe 2+ ), light, heat, ultrasound, PS, or PMS can be activated to produce (Ji et al 2016 ; Naim and Ghauch 2016 ; Wei et al 2017 ). UV-254nm irradiation, which has been widely used for sterilization and disinfection, is also a promising method that activates PS/PMS to generate sulfate radical efficiently (Lin et al 2020 ; Zhang et al 2021 ). Lin et al ( 2020 ) studied the degradation of organosilicon wastewater by UV-based advanced oxidation processes: UV/H 2 O 2 , UV/peroxydisulfate (PDS), and UV/peroxymonosulfate (PMS), and the results showed that UV/PDS achieved a higher COD removal (90.6%) than UV/PMS (80.8%) after a 240 min reaction time.…”

Section: Introductionmentioning

confidence: 99%

Degradation of trimethoprim by sulfate radical-based advanced oxidation processes: kinetics, mechanisms, and effects of natural water matrices

Luo

Yao

et al. 2021

Environ Sci Pollut Res

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Section: Introductionmentioning

confidence: 99%

Degradation of trimethoprim by sulfate radical-based advanced oxidation processes: kinetics, mechanisms, and effects of natural water matrices

Luo

Yao

et al. 2021

Environ Sci Pollut Res

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“…By using the data in Figure 1, the kobs values of iopromide degradation during UV photolysis, UV/Cl2, and UV/PS can be calculated as 4.58 (± 0.02) × 10 −2 , 2.20 (± 0.01) × 10 −1 , and 6.08 (± 0.10) × 10 −2 min −1 , respectively. The kobs values for UV/Cl2 and UV/PS were greater than the value for UV irradiation alone due to the generation of •OH, •SO4 − , and RCS [24].…”

Section: Kinetics Of Iopromide Degradation During Uv Photolysis Uv/cl...mentioning

confidence: 74%

Degradation Kinetics and Disinfection By-Product Formation of Iopromide during UV/Chlorination and UV/Persulfate Oxidation

Wang

Lin³

et al. 2022

Water

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As the detection of micropollutants in various water resources is commonly reported, developing an efficient technology to remove them to maintain water safety has become a major focus in recent years. The degradation kinetics of iopromide, one of a group of iodinated X-ray contrast media (ICM), using advanced oxidation processes of ultraviolet/chlorination (UV/Cl2) and UV/persulfate (UV/PS) oxidation were investigated in this research. The results show that iopromide degradation fitted pseudo-first-order kinetics, and the rate constants were calculated as 2.20 (± 0.01) × 10−1 min−1 and 6.08 (± 0.10) × 10−2 min−1 in UV/Cl2 and UV/PS, respectively. In the two systems, the degradation rates were positively correlated with the initial concentrations of HOCl and PS, respectively. In the UV/Cl2 system, the degradation rate of iopromide reached a maximum at pH 7, while in the UV/PS system, pH had only a slight effect on the degradation rate. Chloride in water had a negligible effect on iopromide degradation, whereas bromide inhibited iopromide degradation in the UV/Cl2 system. The contributions of UV irradiation, •OH, and RCS to iopromide degradation during UV/Cl2 treatment were calculated as 20.8%, 54.1%, and 25.1%, respectively. One carbonated and three nitrogenated disinfection by-products (C-DBP (chloroform) and N-DBPs (dichloroacetonitrile, trichloronitromethane, and trichloroacetone)) were detected at relatively high levels, along with three emerging iodinated DBPs (dichloroiodomethane, monochlorodiiodomethane, and triiodomethane). More C- and N-DBPs were generated in the UV/Cl2 and UV/PS systems than in UV irradiation, while considerably higher I-DBPs were generated in UV irradiation than in the other two systems. Thus, it is essential to pay attention to DBP formation when UV/Cl2 or UV/PS is used to treat iopromide in water. In order to better control the generation of carcinogenic and toxic I-DBPs, Cl2 or PS combined with UV should be adopted for iopromide degradation, instead of UV alone, for providing safe drinking water to the public.

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“…A UV/H 2 O 2 system was established using a low-pressure mercury lamp (254 nm, 28 W, Shanghai Jiguang Special Lighting Appliance Factory) in a quartz sleeve for the generation of only solution HO · . The details about the photoexcitation system have been described in previous reports …”

Section: Methodsmentioning

confidence: 99%

“…The details about the photoexcitation system have been described in previous reports. 21 The photoexcitation system using 0.05 mM Rose Bengal (RB) as the 1 O 2 photosensitizer was set up in a 1 L cylindrical quartz reactor with a fluorescent lamp (output 24 W, Philips Co.). 22 2.6.…”

Section: Generation Of Ho• and Singletmentioning

confidence: 99%

Interaction between Organic Compounds and Catalyst Steers the Oxidation Pathway and Mechanism in the Iron Oxide-Based Heterogeneous Fenton System

Chen

Yang

Qian

et al. 2022

Environ. Sci. Technol.

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In the past decades, extensive efforts have been devoted to the mechanistic understanding of various heterogeneous Fenton reactions. Nevertheless, controversy still remains on the oxidation mechanism/pathway toward different organic compounds in the classical iron oxide-based Fenton reaction, largely because the role of the interaction between the organic compounds and the catalyst has been scarcely considered. Here, we revisited the classic heterogeneous ferrihydrite (Fhy)/H2O2 system toward different organic compounds on the basis of a series of degradation experiments, alcohol quenching experiments, theoretical modeling, and intermediate analysis. The Fhy/H2O2 system exhibited highly selective oxidation toward the group of compounds that bear carboxyl groups, which tend to complex with the surface Fe(III) sites of the Fhy catalyst. Such interaction results in a nonradical inner sphere electron transfer process, which seizes one electron from the target compound and features negligible inhibition by the radical quencher. In contrast, for the oxidation of organic compounds that could not complex with the catalyst, the traditional HO· process makes the main contribution, which proceeds via hydroxyl addition reaction and could be readily suppressed by the radical quencher. This study implies that the interaction between the organic compounds and the catalyst plays a decisive role in the oxidation pathway and mechanism of the target compounds and provides a holistic understanding on the iron oxide-based heterogeneous Fenton system.

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Unravelling molecular transformation of dissolved effluent organic matter in UV/H2O2, UV/persulfate, and UV/chlorine processes based on FT-ICR-MS analysis

Cited by 91 publications

References 84 publications

Degradation of trimethoprim by sulfate radical-based advanced oxidation processes: kinetics, mechanisms, and effects of natural water matrices

Degradation of trimethoprim by sulfate radical-based advanced oxidation processes: kinetics, mechanisms, and effects of natural water matrices

Degradation Kinetics and Disinfection By-Product Formation of Iopromide during UV/Chlorination and UV/Persulfate Oxidation

Interaction between Organic Compounds and Catalyst Steers the Oxidation Pathway and Mechanism in the Iron Oxide-Based Heterogeneous Fenton System

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