Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2

Meroni, D. and Jiménez-Salcedo, M. and Falletta, E. and Bresolin, B.M. and Kait, C.F. and Boffito, D.C. and Bianchi, C.L. and Pirola, C. (2020) Sonophotocatalytic degradation of sodium diclofenac using low power ultrasound and micro sized TiO2. Ultrasonics Sonochemistry, 67.

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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. © 2020 Elsevier B.V.

Item Type: Article
Impact Factor: cited By 18
Uncontrolled Keywords: Degradation; Photocatalysis; Photolysis; Potable water; Reaction intermediates; Silver compounds; Sodium; Titanium dioxide; Ultrasonics; Wastewater treatment; Water pollution, Combined treatment; Degradation mechanism; Hydroxyl radicals; Non-steroidal anti-inflammatory drugs; Pulsed ultrasounds; Reactor configuration; Sodium diclofenac; Water pollutants, Water treatment, diclofenac; drinking water; hydroxyl radical; tap water; titanium dioxide; diclofenac; titanium; titanium dioxide, Article; controlled study; degradation; first order rate constant; liquid chromatography-mass spectrometry; photocatalysis; photolysis; priority journal; ultrasound; ultraviolet A radiation; ultraviolet irradiation; catalysis; chemistry; kinetics; particle size; photochemistry; water pollutant, Catalysis; Diclofenac; Drinking Water; Kinetics; Particle Size; Photochemical Processes; Sonication; Titanium; Water Pollutants, Chemical
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 25 Mar 2022 03:14
Last Modified: 25 Mar 2022 03:14
URI: http://scholars.utp.edu.my/id/eprint/29929

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