Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2
The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ul...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Meroni, Daniela [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2020transfer abstract |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Apparent Progression of Presbyopia After Laser In Situ Keratomileusis in Patients With Early Presbyopia - Tsuneyoshi, Yukari ELSEVIER, 2014, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:67 ; year:2020 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.ultsonch.2020.105123 |
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ELV050690736 |
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| 245 | 1 | 0 | |a Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 |
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| 520 | |a The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. | ||
| 520 | |a The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. | ||
| 650 | 7 | |a Water remediation |2 Elsevier | |
| 650 | 7 | |a Photocatalysis |2 Elsevier | |
| 650 | 7 | |a Micro TiO2 |2 Elsevier | |
| 650 | 7 | |a Persistent organic pollutants |2 Elsevier | |
| 650 | 7 | |a Diclofenac |2 Elsevier | |
| 650 | 7 | |a Low power ultrasound |2 Elsevier | |
| 700 | 1 | |a Jiménez-Salcedo, Marta |4 oth | |
| 700 | 1 | |a Falletta, Ermelinda |4 oth | |
| 700 | 1 | |a Bresolin, Bianca M. |4 oth | |
| 700 | 1 | |a Kait, Chong Fai |4 oth | |
| 700 | 1 | |a Boffito, Daria C. |4 oth | |
| 700 | 1 | |a Bianchi, Claudia L. |4 oth | |
| 700 | 1 | |a Pirola, Carlo |4 oth | |
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10.1016/j.ultsonch.2020.105123 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001750.pica (DE-627)ELV050690736 (ELSEVIER)S1350-4177(20)30107-3 DE-627 ger DE-627 rakwb eng 610 VZ 300 330 VZ 83.00 bkl 85.00 bkl 83.11 bkl Meroni, Daniela verfasserin aut Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. Water remediation Elsevier Photocatalysis Elsevier Micro TiO2 Elsevier Persistent organic pollutants Elsevier Diclofenac Elsevier Low power ultrasound Elsevier Jiménez-Salcedo, Marta oth Falletta, Ermelinda oth Bresolin, Bianca M. oth Kait, Chong Fai oth Boffito, Daria C. oth Bianchi, Claudia L. oth Pirola, Carlo oth Enthalten in Elsevier Science Tsuneyoshi, Yukari ELSEVIER Apparent Progression of Presbyopia After Laser In Situ Keratomileusis in Patients With Early Presbyopia 2014 Amsterdam [u.a.] (DE-627)ELV012539554 volume:67 year:2020 pages:0 https://doi.org/10.1016/j.ultsonch.2020.105123 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 83.00 Volkswirtschaft: Allgemeines VZ 85.00 Betriebswirtschaft: Allgemeines VZ 83.11 Mikroökonomie VZ AR 67 2020 0 |
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10.1016/j.ultsonch.2020.105123 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001750.pica (DE-627)ELV050690736 (ELSEVIER)S1350-4177(20)30107-3 DE-627 ger DE-627 rakwb eng 610 VZ 300 330 VZ 83.00 bkl 85.00 bkl 83.11 bkl Meroni, Daniela verfasserin aut Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. Water remediation Elsevier Photocatalysis Elsevier Micro TiO2 Elsevier Persistent organic pollutants Elsevier Diclofenac Elsevier Low power ultrasound Elsevier Jiménez-Salcedo, Marta oth Falletta, Ermelinda oth Bresolin, Bianca M. oth Kait, Chong Fai oth Boffito, Daria C. oth Bianchi, Claudia L. oth Pirola, Carlo oth Enthalten in Elsevier Science Tsuneyoshi, Yukari ELSEVIER Apparent Progression of Presbyopia After Laser In Situ Keratomileusis in Patients With Early Presbyopia 2014 Amsterdam [u.a.] (DE-627)ELV012539554 volume:67 year:2020 pages:0 https://doi.org/10.1016/j.ultsonch.2020.105123 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 83.00 Volkswirtschaft: Allgemeines VZ 85.00 Betriebswirtschaft: Allgemeines VZ 83.11 Mikroökonomie VZ AR 67 2020 0 |
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10.1016/j.ultsonch.2020.105123 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001750.pica (DE-627)ELV050690736 (ELSEVIER)S1350-4177(20)30107-3 DE-627 ger DE-627 rakwb eng 610 VZ 300 330 VZ 83.00 bkl 85.00 bkl 83.11 bkl Meroni, Daniela verfasserin aut Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. Water remediation Elsevier Photocatalysis Elsevier Micro TiO2 Elsevier Persistent organic pollutants Elsevier Diclofenac Elsevier Low power ultrasound Elsevier Jiménez-Salcedo, Marta oth Falletta, Ermelinda oth Bresolin, Bianca M. oth Kait, Chong Fai oth Boffito, Daria C. oth Bianchi, Claudia L. oth Pirola, Carlo oth Enthalten in Elsevier Science Tsuneyoshi, Yukari ELSEVIER Apparent Progression of Presbyopia After Laser In Situ Keratomileusis in Patients With Early Presbyopia 2014 Amsterdam [u.a.] (DE-627)ELV012539554 volume:67 year:2020 pages:0 https://doi.org/10.1016/j.ultsonch.2020.105123 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 83.00 Volkswirtschaft: Allgemeines VZ 85.00 Betriebswirtschaft: Allgemeines VZ 83.11 Mikroökonomie VZ AR 67 2020 0 |
| allfieldsGer |
10.1016/j.ultsonch.2020.105123 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001750.pica (DE-627)ELV050690736 (ELSEVIER)S1350-4177(20)30107-3 DE-627 ger DE-627 rakwb eng 610 VZ 300 330 VZ 83.00 bkl 85.00 bkl 83.11 bkl Meroni, Daniela verfasserin aut Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. Water remediation Elsevier Photocatalysis Elsevier Micro TiO2 Elsevier Persistent organic pollutants Elsevier Diclofenac Elsevier Low power ultrasound Elsevier Jiménez-Salcedo, Marta oth Falletta, Ermelinda oth Bresolin, Bianca M. oth Kait, Chong Fai oth Boffito, Daria C. oth Bianchi, Claudia L. oth Pirola, Carlo oth Enthalten in Elsevier Science Tsuneyoshi, Yukari ELSEVIER Apparent Progression of Presbyopia After Laser In Situ Keratomileusis in Patients With Early Presbyopia 2014 Amsterdam [u.a.] (DE-627)ELV012539554 volume:67 year:2020 pages:0 https://doi.org/10.1016/j.ultsonch.2020.105123 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 83.00 Volkswirtschaft: Allgemeines VZ 85.00 Betriebswirtschaft: Allgemeines VZ 83.11 Mikroökonomie VZ AR 67 2020 0 |
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10.1016/j.ultsonch.2020.105123 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001750.pica (DE-627)ELV050690736 (ELSEVIER)S1350-4177(20)30107-3 DE-627 ger DE-627 rakwb eng 610 VZ 300 330 VZ 83.00 bkl 85.00 bkl 83.11 bkl Meroni, Daniela verfasserin aut Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. Water remediation Elsevier Photocatalysis Elsevier Micro TiO2 Elsevier Persistent organic pollutants Elsevier Diclofenac Elsevier Low power ultrasound Elsevier Jiménez-Salcedo, Marta oth Falletta, Ermelinda oth Bresolin, Bianca M. oth Kait, Chong Fai oth Boffito, Daria C. oth Bianchi, Claudia L. oth Pirola, Carlo oth Enthalten in Elsevier Science Tsuneyoshi, Yukari ELSEVIER Apparent Progression of Presbyopia After Laser In Situ Keratomileusis in Patients With Early Presbyopia 2014 Amsterdam [u.a.] (DE-627)ELV012539554 volume:67 year:2020 pages:0 https://doi.org/10.1016/j.ultsonch.2020.105123 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_40 83.00 Volkswirtschaft: Allgemeines VZ 85.00 Betriebswirtschaft: Allgemeines VZ 83.11 Mikroökonomie VZ AR 67 2020 0 |
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Apparent Progression of Presbyopia After Laser In Situ Keratomileusis in Patients With Early Presbyopia |
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sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized tio2 |
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Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 |
| abstract |
The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. |
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The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. |
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The nonsteroidal anti-inflammatory drug sodium diclofenac (DC) is an emerging water pollutant which resists conventional wastewater treatments. Here the sonophotocatalytic degradation of DC was carried out using micrometric TiO2 (both pristine and Ag-decorated), UV-A irradiation and 20 kHz pulsed ultrasound. Sonophotocatalytic tests were compared with photolysis, sonolysis, sonophotolysis, sonocatalysis and photocatalysis data performed in the same conditions. A synergy index of over 2 was determined for tests with pristine TiO2, while values close to 1.3 were observed for Ag-TiO2. Reaction intermediates were studied by HPLC–MS, showing degradation mechanisms activated by hydroxyl radicals. Similar pathways were identified for photocatalytic and sonophotocatalytic tests, although the latter led to more oxidized compounds. Different reactor configurations (static and dynamic set ups) were studied. Sequential and simultaneous application of UV light and ultrasound led to similar performance. The role of water matrix was investigated using ultrapure and drinking water, showing marked detrimental effects of electrolytes on the DC degradation. Overall, the combined treatment proved more efficient than photocatalysis alone especially in demanding working conditions, like in drinking water matrices. |
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Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2 |
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