Radicals ( OH, Cl , ClO  and Cl2−) concentration profiles in the intensified degradation of reactive green 12 by UV/chlorine process: Chemical kinetic analysis using a validated model

Djaballah, Mohamed Larbi; Belghit, Aouattef; Dehane, Aissa; Merouani, Slimane; Hamdaoui, Oualid; Ashokkumar, Muthapandian

doi:10.1016/j.jphotochem.2023.114557

Cited by 11 publications

(5 citation statements)

References 55 publications

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“…The low scientific and technological production in the use of the UV/H 2 O 2 /Cl 2 system prevents the advantages of the system from being explored, such as that this system can be more effective than separate disinfection systems in eliminating microorganisms, because each system component works synergistically to maximize the effectiveness of the disinfection process, generating a wide variety of oxidants (H 2 O 2 , Cl 2 , HClO, ClO, HO∙, O − ∙, O 2 ∙ − , Cl∙, among others) (Belghit et al 2020 ; Berruti et al 2022 ; Djaballah et al 2023 ). The combination of UV, H 2 O 2 , and/or Cl 2 also helps to reduce the amount of by-products and residues produced during the disinfection process.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, combined UV/H 2 O 2 systems are a promising alternative for water treatment and environmental removal of ARBs and ARGs. Other untested combined systems, such as H 2 O 2 /Cl 2 and UV/H 2 O 2 /Cl 2 , may also be effective for selected applications (Belghit et al 2020 ; Berruti et al 2022 ; Djaballah et al 2023 ). (ii) Disinfection processes based on UV, H 2 O 2 , and Cl 2 have great versatility to work in a wide range of pH.…”

Section: Resultsmentioning

confidence: 99%

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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%

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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“…One explanation for this behavior can be attributed to the consumption of OH – by generating Cl 2 . − As indicated in eqs –, the recombination of Cl • and Cl 2 •– can form Cl 2 , which can consume hydroxyl ions (eq ) significantly faster than its capacity to hydrolyze back to active chlorine (eq ). Reducing the pH could also have induced a positive feedback loop to promote the formation of Cl • and Cl 2 •– , shown to almost double when reducing the pH from 9 to 7 . An alternative is eq , in which the progressively decreasing ClO • from residual chlorine loss could also have consumed OH – . Cl • + Cl • → Cl 2 ; k = 8.8 × 10 7 M − 1 · s − 1 Cl 2 • − + C l 2 • − → Cl 2 + 2 Cl − ; k = 9.0 × 10 8 M − 1 · s − 1 C l …”

Section: Resultsmentioning

confidence: 99%

“…, shown to almost double when reducing the pH from 9 to 7. 30 An alternative is eq 6, in which the progressively decreasing ClO…”

Section: •−mentioning

confidence: 99%

Chlorine Reuse in UV/Electrochemical Oxidation to Advance Sewage Cotreatment of Landfill Leachate

Sato,

Guo,

Xiang

et al. 2023

ACS EST Water

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“…•− , iodine, and reactive chlorine species) that enhance the removal efficiency of these micropollutants [6][7][8][9]. For effective water treatment, UV-assisted processes such as UV/H 2 O 2 , UV/S 2 O 8 2− , and UV/chlorine are used.…”

Section: Introductionmentioning

confidence: 99%

Solar Chlorine Activation for Efficient Rhodamine B Removal in Strong Basic pH: Processing Conditions, Radicals Probing, and TiO2 Nanocatalyst Effect

Bouchoucha,

Bekkouche,

Merouani

et al. 2023

Catalysts

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In recent years, there has been growing interest in the application of UV/chlorine advanced oxidation processes for wastewater treatment. However, few studies have investigated this process in a strongly basic medium (pH > 10), which is a common characteristic of many industrial effluents. In addition, the use of artificial UV lamps in these processes can be costly. To address these challenges, we investigated the use of solar light (referred to as Solar-L) in the Solar-L/chlorine process for the degradation of Rhodamine B (RhB) in a strongly basic medium (pH 11). We found that separate solar light or chlorination showed no degradation after half an hour, but the Solar-L/chlorine process effectively degraded RhB, with complete removal achieved in only 30 min, using 1000 µM ClO−. The process also resulted in a significant reduction of TOC, i.e., 60% after 120 min and 80% after 240 min. Our results indicate that both •OH/O•− and reactive chlorine species (RCS) were involved in the degradation process, while O3 played no role. The process performance improved with the decreasing initial contaminant concentration and increasing temperature (up to 55 °C). The addition of a TiO2 nanocatalyst to the Solar-L/chlorine system significantly improved the RhB degradation efficiency by more than 30%. It was found that neither adsorption (on TiO2) nor Solar-L/TiO2 photolysis contributed to the dye removal by the Solar-L/chlorine/TiO2 system. Instead, the improvement associated with the Solar-L/chlorine/TiO2 system was related to the involvement of hypochlorite in the photocatalytic reaction at the catalyst surface. A detailed discussion of the effect of TiO2 was carried out based on the physicochemical properties of RhB and TiO2 catalyst with respect to the solution’s pH. In conclusion, this study highlights the potential of solar light as a sustainable and efficient technology for the treatment of polluted water in strong basic media in the presence of chlorine and chlorine/TiO2 as additives. These valuable findings provide a basis for the future research and development of this promising technology for water treatment applications.

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Radicals ( OH, Cl , ClO and Cl2−) concentration profiles in the intensified degradation of reactive green 12 by UV/chlorine process: Chemical kinetic analysis using a validated model

Cited by 11 publications

References 55 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

Chlorine Reuse in UV/Electrochemical Oxidation to Advance Sewage Cotreatment of Landfill Leachate

Solar Chlorine Activation for Efficient Rhodamine B Removal in Strong Basic pH: Processing Conditions, Radicals Probing, and TiO2 Nanocatalyst Effect

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