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Far-UVC Radiation Activating Percarbonate to Accelerate the Removal of Methotrexate: Degradation Efficiency, Mechanisms, and Moiety-Dependence Transformation
https://orcid.org/0000-0003-3271-5994
This study investigated innovative advanced oxidation processes (AOPs) combining far-UVC radiation at 222 nm with sodium percarbonate (SPC) to effectively remove methotrexate (MTX). UV222 significantly enhanced the direct photolysis and AOP degradation of MTX. •OH, CO3 •–, and direct photolysis were primarily involved in the degradation, with their relative contribution being in the order •OH > CO3 •– > direct photolysis. The fluence-normalized steady-state concentrations of both CO3 •– and •OH in UV222/SPC were 7.76 and 4.05 times higher, respectively, than those in UV254/SPC. Transformation product analysis revealed distinct MTX degradation pathways and varied degradation rates of MTX substructures between the systems, with the order in UV254/SPC being 4-aminobenzamide (ABZ) > 2,4-diamino-6-(hydroxymethyl) pteridine (DHP) > l-glutamic acid (LG) and that in UV222/SPC being DHP > ABZ > LG, suggesting different reactivities of MTX moieties under each system. The presence of HCO3 – and HA inhibited the MTX degradation, whereas NO3 – promoted it, in the UV222/SPC system. In addition, UV222/SPC demonstrated a lower energy consumption compared to UV254/SPC, highlighting its potential for cost-effective wastewater treatment applications. This study offers new insights into the mechanisms of UV222/SPC systems and provides guidance for the development of technologies for the removal of emerging contaminants.
This study reported the enhanced MTX degradation in the UV222/SPC system, revealing MTX moiety-dependence transformation, which could deepen the understanding of MTX transformation mechanisms and provide guidance for developing UV222-based AOPs in water treatment.
Far-UVC Radiation Activating Percarbonate to Accelerate the Removal of Methotrexate: Degradation Efficiency, Mechanisms, and Moiety-Dependence Transformation
https://orcid.org/0000-0003-3271-5994
This study investigated innovative advanced oxidation processes (AOPs) combining far-UVC radiation at 222 nm with sodium percarbonate (SPC) to effectively remove methotrexate (MTX). UV222 significantly enhanced the direct photolysis and AOP degradation of MTX. •OH, CO3 •–, and direct photolysis were primarily involved in the degradation, with their relative contribution being in the order •OH > CO3 •– > direct photolysis. The fluence-normalized steady-state concentrations of both CO3 •– and •OH in UV222/SPC were 7.76 and 4.05 times higher, respectively, than those in UV254/SPC. Transformation product analysis revealed distinct MTX degradation pathways and varied degradation rates of MTX substructures between the systems, with the order in UV254/SPC being 4-aminobenzamide (ABZ) > 2,4-diamino-6-(hydroxymethyl) pteridine (DHP) > l-glutamic acid (LG) and that in UV222/SPC being DHP > ABZ > LG, suggesting different reactivities of MTX moieties under each system. The presence of HCO3 – and HA inhibited the MTX degradation, whereas NO3 – promoted it, in the UV222/SPC system. In addition, UV222/SPC demonstrated a lower energy consumption compared to UV254/SPC, highlighting its potential for cost-effective wastewater treatment applications. This study offers new insights into the mechanisms of UV222/SPC systems and provides guidance for the development of technologies for the removal of emerging contaminants.
This study reported the enhanced MTX degradation in the UV222/SPC system, revealing MTX moiety-dependence transformation, which could deepen the understanding of MTX transformation mechanisms and provide guidance for developing UV222-based AOPs in water treatment.
Far-UVC Radiation Activating Percarbonate to Accelerate the Removal of Methotrexate: Degradation Efficiency, Mechanisms, and Moiety-Dependence Transformation
https://orcid.org/0000-0003-3271-5994
This study investigated innovative advanced oxidation processes (AOPs) combining far-UVC radiation at 222 nm with sodium percarbonate (SPC) to effectively remove methotrexate (MTX). UV222 significantly enhanced the direct photolysis and AOP degradation of MTX. •OH, CO3 •–, and direct photolysis were primarily involved in the degradation, with their relative contribution being in the order •OH > CO3 •– > direct photolysis. The fluence-normalized steady-state concentrations of both CO3 •– and •OH in UV222/SPC were 7.76 and 4.05 times higher, respectively, than those in UV254/SPC. Transformation product analysis revealed distinct MTX degradation pathways and varied degradation rates of MTX substructures between the systems, with the order in UV254/SPC being 4-aminobenzamide (ABZ) > 2,4-diamino-6-(hydroxymethyl) pteridine (DHP) > l-glutamic acid (LG) and that in UV222/SPC being DHP > ABZ > LG, suggesting different reactivities of MTX moieties under each system. The presence of HCO3 – and HA inhibited the MTX degradation, whereas NO3 – promoted it, in the UV222/SPC system. In addition, UV222/SPC demonstrated a lower energy consumption compared to UV254/SPC, highlighting its potential for cost-effective wastewater treatment applications. This study offers new insights into the mechanisms of UV222/SPC systems and provides guidance for the development of technologies for the removal of emerging contaminants.
This study reported the enhanced MTX degradation in the UV222/SPC system, revealing MTX moiety-dependence transformation, which could deepen the understanding of MTX transformation mechanisms and provide guidance for developing UV222-based AOPs in water treatment.
Far-UVC Radiation Activating Percarbonate to Accelerate the Removal of Methotrexate: Degradation Efficiency, Mechanisms, and Moiety-Dependence Transformation
Chen, Jiawei (Autor:in) / Du, Lin (Autor:in) / Liu, Jian (Autor:in) / Lin, Lifeng (Autor:in) / Zhao, Min (Autor:in) / Wang, Lei (Autor:in) / Chen, Shaohua (Autor:in) / Huang, Jianzhi (Autor:in)
ACS ES&T Water ; 4 ; 3089-3098
12.07.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| DOAJ | 2022
| DOAJ | 2024