pH-dependent contribution of chlorine monoxide radicals and byproducts formation during UV/chlorine treatment on clothianidin

Lee, Youn-Jun; Lee, Changgu; Park, Seong‐Jik; Moon, Joon‐Kwan; Alvarez, Pedro J. J.

doi:10.1016/j.cej.2021.132444

Cited by 22 publications

(6 citation statements)

References 52 publications

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“…In general, in these articles where they do not implement any relevant water sample, they only detail the pH because it is an important factor in UV, H 2 O 2 , and/or Cl 2 disinfection systems individually and in combination, as it can significantly affect the disinfection efficiency (Gao et al 2020 ; Lee et al 2022 ; Wang et al 2019a , b , c ). For example, when disinfecting with H 2 O 2 and Cl 2 , pH is also an important factor.…”

Section: Resultsmentioning

confidence: 99%

Systematic analysis of the scientific-technological production on the use of the UV, H2O2, and/or Cl2 systems in the elimination of bacteria and associated antibiotic resistance genes

Espinosa-Barrera,

Gómez-Gómez,

Vanegas

et al. 2024

Environ Sci Pollut Res

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This study presents a systematic review of the scientific and technological production related to the use of systems based on UV, H2O2, and Cl2 for the elimination of antibiotic-resistant bacteria (ARB) and genes associated with antibiotic resistance (ARGs). Using the Pro Know-C (Knowledge Development Process-Constructivist) methodology, a portfolio was created and analyzed that includes 19 articles and 18 patents published between 2011 and 2022. The results show a greater scientific-technological production in UV irradiation systems (8 articles and 5 patents) and the binary combination UV/H2O2 (9 articles and 4 patents). It was emphasized that UV irradiation alone focuses mainly on the removal of ARB, while the addition of H2O2 or Cl2, either individually or in binary combinations with UV, enhances the removal of ARB and ARG. The need for further research on the UV/H2O2/Cl2 system is emphasized, as gaps in the scientific-technological production of this system (0 articles and 2 patents), especially in its electrochemically assisted implementation, have been identified. Despite the gaps identified, there are promising prospects for the use of combined electrochemically assisted UV/H2O2/Cl2 disinfection systems. This is demonstrated by the effective removal of a wide range of contaminants, including ARB, fungi, and viruses, as well as microorganisms resistant to conventional disinfectants, while reducing the formation of toxic by-products.

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Section: Resultsmentioning

confidence: 99%

Systematic analysis of the scientific-technological production on the use of the UV, H2O2, and/or Cl2 systems in the elimination of bacteria and associated antibiotic resistance genes

Espinosa-Barrera,

Gómez-Gómez,

Vanegas

et al. 2024

Environ Sci Pollut Res

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“…First, it may be due to the fact that more free chlorine is produced for the degradation of SAs at a pH close to 8.3 after the addition of SAs, and therefore, the degradation rate is highest and the kinetic rate of degradation is maximum at this time. Another possible reason is due to the fact that free chlorine in solution will be more present in solution as OCl – when the solution is weakly alkaline, and HOCl/OCl – will be more photolytically converted to • Cl, • OH under UV . At the same time, both HOCl and OCl – continue to generate more active chlorine species with free radicals, but the kinetic rate of OCl – generation of active chlorine species is significantly faster (eqs –).…”

Section: Resultsmentioning

confidence: 99%

“…Another possible reason is due to the fact that free chlorine in solution will be more present in solution as OCl – when the solution is weakly alkaline, and HOCl/OCl – will be more photolytically converted to • Cl, • OH under UV. 37 At the same time, both HOCl and OCl – continue to generate more active chlorine species with free radicals, but the kinetic rate of OCl – generation of active chlorine species is significantly faster ( eqs 8 – 11 ). Their rate constants are 2.0 × 10 9 , 8.8 × 10 9 , 3.0 × 10 9 , and 8.2 × 10 9 M –1 s –1 , in that order.…”

Section: Resultsmentioning

confidence: 99%

Degradation of Sulfonamides by UV/Electrochemical Oxidation and the Effects of Treated Effluents on the Bacterial Community in Surface Water

et al. 2023

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This study evaluated the effects of ultraviolet (UV) photolysis combined with electrochemical oxidation on sulfonamides (SAs) as well as its treated effluent on the bacterial community in surface water. In terms of degradation rate, the best anode material for electrochemical oxidation was Ti/RuO2–IrO2, which had the highest degradation kinetic constant compared to Ti/Ta2O5–IrO2 and Ti/Pt. Experiments showed the highest degradation rate of SAs at 8.3 pH. Similarly, increasing the current leads to stronger degradation due to the promotion of free chlorine production, and its energy consumption rate decreases slightly from 73 to 67 W h/mmol. Compared with tap water, the kinetic constants decreased by 20–62% for SAs in three different surface water samples, which was related to the decrease in free chlorine. When extending the reaction time to 24 h, the concentrations of chemical oxygen demand and total organic carbon decreased by approximately 30–40%, indicating that the SAs and their products could be mineralized. The diversity analysis showed that the effluents influenced the richness and diversity of the bacterial community, particularly in the 4 h sample. Additionally, there were 86 operational taxonomic units common to all samples, excluding the 4 h sample; significant differences were derived from changes in the Actinobacteriota and Bacteroidota phyla. The toxicity of the products might explain these changes, and these products could be mineralized, as observed in the 24 h sample. Therefore, the extension of treatment time would greatly reduce the ecological harm of treated effluent and ensure that the UV/electrochemical process is a feasible treatment option. Overall, this study provides valuable insight into the optimization and feasibility of UV/electrochemical processes as a sustainable treatment option for sulfonamide-contaminated water sources, emphasizing the importance of considering ecological impacts and the need for extended treatment times that address environmental concerns and ensuring improved water quality.

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“…This can be attributed to the screening of light by HA. The estimated absorbance of the HA that was used in this study was 0.0184 mg/L/cm, and thus, it could inhibit the absorption of light by OTC [18]. Furthermore, HA can also scavenge excited-state organic molecules, resulting in a decreased photodegradation rate [28].…”

Section: Effects Of Ha and Inorganic Ions On Otc Degradationmentioning

confidence: 98%

“…•− , 1 O 2 ) to promote degradation [17], but NOM can also inhibit photolysis by screening the light and/or scavenging the reactive species [18,19]. Similarly, inorganic ions can affect the degradation efficiency during UV photolysis [20].…”

Section: Introductionmentioning

confidence: 99%

Photodegradation Behavior of Agricultural Antibiotic Oxytetracycline in Water

Lee

et al. 2022

Water

Self Cite

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Due to their overuse in agriculture, antibiotics are discharged into the aquatic environment, which poses a threat to human health and aquatic organisms. The agricultural antibiotic oxytetracycline (OTC) persists in aquatic media for a long time due to its resistance to biological degradation. Photolysis is a main pathway for its degradation in the natural environment and wastewater treatment, and thus, the photolysis of OTC should be investigated. In this study, the effects of reaction conditions such as the irradiation conditions, the initial OTC concentration, and the water matrix on OTC photolysis were investigated. The most efficient degradation was observed when UV-C was used as the irradiation source (k = 0.0148 ± 0.0008 min−1), and the removal ratio increased with higher light intensity. A lower initial OTC concentration and higher solution temperature were advantageous for the degradation of OTC. The presence of humic acid or inorganic ions negatively affected the degradation rate of OTC. In addition to the effects of the reaction conditions, the degradation kinetics of OTC in actual agricultural water and the photolysis of various antibiotics such as streptomycin, validamycin A, and oxolinic acid were further studied. This work proved that various factors could decrease the photodegradation of OTC, which raises the potential risks that are associated with the persistent use of antibiotics in the water environment. Therefore, the results of the present study can help to provide an understanding of the effects of various reaction conditions on the degradation of agricultural antibiotics.

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pH-dependent contribution of chlorine monoxide radicals and byproducts formation during UV/chlorine treatment on clothianidin

Cited by 22 publications

References 52 publications

Systematic analysis of the scientific-technological production on the use of the UV, H2O2, and/or Cl2 systems in the elimination of bacteria and associated antibiotic resistance genes

Systematic analysis of the scientific-technological production on the use of the UV, H2O2, and/or Cl2 systems in the elimination of bacteria and associated antibiotic resistance genes

Degradation of Sulfonamides by UV/Electrochemical Oxidation and the Effects of Treated Effluents on the Bacterial Community in Surface Water

Photodegradation Behavior of Agricultural Antibiotic Oxytetracycline in Water

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