Ibuprofen degradation and toxicity evolution during Fe2+/Oxone/UV process

Gong, Han; Chu, Wei; So, Hiu Lam; Lin, Angela Yu-Chen

doi:10.1016/j.chemosphere.2016.10.027

Cited by 47 publications

(15 citation statements)

References 18 publications

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“…Davide 35 found that both ozonation and UV/H 2 O 2 systems proved to be effective in DCF degradation, ensuring a complete conversion of the chlorine into chloride ions, while degrees of mineralization for ozonation was 32% and 39% for UV/H 2 O 2 after a 90-min treatment. Similar low TOC removal results have been reported in degrading the three NSAIDs using other AOPs, such as UV/H 2 O 2 36 , UV/O 3 37 , and UV/TiO 2 38 . It can be concluded that DPs cannot be mineralized effectively by AOPs, though parent compounds are largely removed.…”

Section: Resultssupporting

confidence: 84%

“… 58 observed that C. carpio exposed to 7 mg/L DCF water was affected in oxidative stress status during the initial days of the study (at 4 days), exhibiting an increased response in blood and liver at 24 days. A higher toxicity of DPs of NSAIDs (NPX 59 , DCF 60 , IBP 37 , 39 ) generated in UV or AOPs were observed using Daphnia magna, Vibrio fisheri as test organisms. According to the biochemical parameters, Group 4 (NSAIDs treated by UV/PS for 30 min) showed more severe oxidative damage than Group 3 (NSAIDs treated by UV/PS for 5 min), suggesting that more toxic DPs were produced as the UV/PS treatment time increased.…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Comparative study of the toxicity between three non-steroidal anti-inflammatory drugs and their UV/Na2S2O8 degradation products on Cyprinus carpio

Gao

Geng

et al. 2018

Sci Rep

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The efficiency of advanced oxidation processes (AOPs) for disposing of non-steroidal anti-inflammatory drugs (NSAIDs) has been widely studied, but the environmental fates and effects of the NSAIDs and their degradation products (DPs) are poorly understood. In this study, the efficiency of ultraviolet light/Na2S2O8 (UV/PS) in degrading three NSAIDs—diclofenac, naproxen, and ibuprofen—and the toxicity of their DPs on Cyprinus carpio (C. carpio) was investigated. Results showed that the three NSAIDs can be completely removed (removal rate > 99.9%) by UV/PS, while the mineralization rate of the NSAIDs was only 28%. When C. carpio were exposed to 0.1 μM NSAIDs, 10 μM persulfate (PS), and 0.1 μM DPs of the NSAIDs for 96 h, respectively, the toxicity effects are as the NSAID DPs > PS > NSAIDs. Research results into the time-dependent effect of NSAID DPs on C. carpio demonstrated that obvious toxicity effects were observed in the first 48 hours, and the toxicity effects strengthened over time. NSAID DPs may have more severe toxicity effects than NSAIDs on C. carpio; therefore, the operating conditions of UV/PS must be optimized to eliminate the ecotoxicity of DPs.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 97%

Comparative study of the toxicity between three non-steroidal anti-inflammatory drugs and their UV/Na2S2O8 degradation products on Cyprinus carpio

Gao

Geng

et al. 2018

Sci Rep

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show abstract

“…Because the samples were taken manually, the first sampling point fell into 10 s–30 min in the literature determining the degradation kinetics of organic contaminants in the Fe(II)/PMS process, as summarized in Table S1. The researchers have neglected the degradation kinetics of organic contaminants in the Fe(II)/PMS process before the first sampling point, although most of the organic contaminants were decomposed in this stage. ,− ,− For instance, one study displayed that 74.2% of 2-chlorobiphenyl was degraded within 30 min (the first sampling time) in the Fe(II)/PMS process and only 23.6% of 2-chlorobiphenyl was further oxidized in the following 3.5 h . Therefore, it could be inferred that the degradation rate of organic contaminants in the rapid oxidation stage was greatly underestimated in the literature.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Organic Contaminants in the Fe(II)/Peroxymonosulfate Process under Acidic Conditions: The Overlooked Rapid Oxidation Stage

Dong

Lian

et al. 2021

Environ. Sci. Technol.

154

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The iron(II)-activated peroxymonosulfate [Fe(II)/ PMS] process is effective in degrading organic contaminants with a rapid oxidation stage followed by a slow one. Nevertheless, prior studies have greatly underestimated the degradation rates of organic contaminants in the rapid oxidation stage and ignored the differences in the kinetics and mechanism of organic contaminants degradation in these two oxidation stages. In this work, we investigated the kinetics and mechanisms of organic contaminants in this process under acidic conditions by combining the stoppedflow spectrophotometric method and batch experiments. The organic contaminants were rapidly oxidized with rate constants of 0.18−2.9 s −1 in the rapid oxidation stage. Meanwhile, both Fe(IV) and SO 4•− were active oxidants and contributed differently to the degradation of different organic contaminants in this stage. Additionally, the presence of Cl − promoted the degradation of both phenol and estradiol but the effects of Br − and humic acid on phenol degradation differed from those on estradiol degradation in the rapid oxidation stage. In contrast, the degradation of phenol and estradiol was slow and the amounts of Fe(IV) and SO 4•− generated were small in the slow oxidation stage. This work updates the fundamental understanding of the degradation of organic contaminants in this process.

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“…In the single Fe 2+ and single UV lacking in oxidant, the main contribution to the removal of organics was iron colloids or UV light. 37,38 In single H 2 O 2 without catalysis, ROS production was limited. Hence, the single process cannot achieve a satisfactory treatment results for the above reasons.…”

Section: Resultsmentioning

confidence: 99%

Removal of refractory organics in dinitrodiazophenol industrial wastewater by an ultraviolet-coupled Fenton process

Ran

2019

RSC Adv.

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A significant amount of biorefractory organic wastewater is generated during the production of dinitrodiazophenol (DDNP). In this study, ultraviolet light (254 nm) that was coupled with the Fenton (UV-Fenton) process was applied to treat refractory organics in DDNP industrial wastewater. The effects of key parameters (i.e., H 2 O 2 dose, Fe 2+ dosage, and initial pH) on the treatment efficacy for DDNP industrial wastewater by the UV-Fenton process was investigated systematically. Alcohol quenching experiments were carried out to identify reactive oxygen species in the UV-Fenton process. The treatment efficacy and degradation characteristics of refractory organics were studied and compared by using control experiments. Increasing H 2 O 2 and Fe 2+ doses could lead to improved treatment results to a different extent. A more intense reaction and better treatment results were achieved by using the UV-Fenton process at lower pH conditions. Under optimal conditions of H 2 O 2 dose ¼ 7.5 mL L À1 , Fe 2+ dosage ¼ 0.05 mM, and initial pH ¼ 5.0, the pseudo-first order constants k for chemical oxygen demand removal and color number removal were 0.18 min À1 and 1.24 min À1 , and the chemical oxygen demand and color number removal efficiencies were 74.24% and 99.94%, respectively. The treatment results for the UV-Fenton process were better than other processes under the same conditions, and a significant synergetic effect was observed for the UV-Fenton process. Alcohol quenching experiments indicated that the predominant reactive oxygen species in the UV-Fenton process was the hydroxyl radical ($OH). Because more $OH was produced, the UV-Fenton process exhibited a much better treatment performance in degrading and destroying organic structures (i.e., benzene rings, -NO 2 , and -N]N-). Furthermore, the biodegradability indicated by the biological oxygen demand/chemical oxygen demand ratio was improved considerably to 0.48 from 0.054. The good treatment performance by UV-Fenton allowed for a more efficient electrical energy consumption compared with the UV and UV-H 2 O 2 . This study provides a theoretical reference for DDNP industrial wastewater treatment by using the UV-Fenton process.

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Ibuprofen degradation and toxicity evolution during Fe2+/Oxone/UV process

Cited by 47 publications

References 18 publications

Comparative study of the toxicity between three non-steroidal anti-inflammatory drugs and their UV/Na2S2O8 degradation products on Cyprinus carpio

Comparative study of the toxicity between three non-steroidal anti-inflammatory drugs and their UV/Na2S2O8 degradation products on Cyprinus carpio

Degradation of Organic Contaminants in the Fe(II)/Peroxymonosulfate Process under Acidic Conditions: The Overlooked Rapid Oxidation Stage

Removal of refractory organics in dinitrodiazophenol industrial wastewater by an ultraviolet-coupled Fenton process

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