Stoichiometric excesses of H2O2 as dosimetry strategy: proof of concept for UVC-H2O2, dark-Fenton, and UVC-Fenton

In the photo-chemical conversion of hydrogen peroxide (H2O2) into radical ⦁OH, the impact of radiation dose (the quantum yield) on the oxidation kinetics has been properly reported, whereas the H2O2 dose is mostly treated as an attempt-and-error variable. This present work formally analyses the oxidant dose in terms of the efficiency of ⦁OH consumption by the micropollutant mineralization, which ultimately enables a generalist strategy for more cost-effective dosimetry of the oxidant. The experimental timedependent measure of two reagents (pollutant and oxidant) and one product (CO2) enables assessment to the micro-kinetics from the perspective of the chemical dynamic. The analysis was demonstrated for photo-Fenton (FP) oxidation of hydrochlorothiazide (HCT) using a tubular photo-reactor and UVA radiation. The average value of ~ 38% was on top of the best efficiencies in association with some of the fastest rates of mineralization. Such efficiencies are demonstrated to depend on the stochiometric concentration of the oxidant. Here, the variable stoichiometric H2O2 excess for mineralization is proposed as a universal metric to quantify the (under-) over-dose of H2O2. Overall, H2O2 excess between 2 and 5 leads to H2O2 consumption efficiencies above 30% together with a fast rate of CO2 formation (mineralization), whereas any value below 1 invariably leads to a sluggish oxidation rate, leading even to the full depletion of the oxidant. Aside from proposing a selection criterion for the most cost-effective H2O2dose and providing some examples, this work carefully analyzes the commitment of the H2O2 excess with respect to the energy costs (EEO).

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Efficiency of the H2O2 consumption by the mineralization of hydrochlorothiazide via photo-Fenton UVA: a time dependent analysis

Mota-Lima

Cunha-Filho²,

Chiavone‐Filho³

et al. 2022

Braz. J. Chem. Eng.

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Degradation of methyl orange using hydrodynamic cavitation coupled with plasma oxidation and ultraviolet C

Song,

Nie,

et al. 2024

Journal of Cleaner Production

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Highly sensitive voltammetric determination of hydrochlorothiazide using a glassy carbon electrode modified with Super P carbon black nanoparticles

Santos-Neto,

Lopes,

Silva

et al. 2024

Anal. Methods

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Stoichiometric excesses of H2O2 as dosimetry strategy: proof of concept for UVC-H2O2, dark-Fenton, and UVC-Fenton

Cited by 3 publications

References 37 publications

Efficiency of the H2O2 consumption by the mineralization of hydrochlorothiazide via photo-Fenton UVA: a time dependent analysis

Efficiency of the H2O2 consumption by the mineralization of hydrochlorothiazide via photo-Fenton UVA: a time dependent analysis

Degradation of methyl orange using hydrodynamic cavitation coupled with plasma oxidation and ultraviolet C

Highly sensitive voltammetric determination of hydrochlorothiazide using a glassy carbon electrode modified with Super P carbon black nanoparticles

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