Scalable production of hydroxyl radicals (.OH) via homogeneous photolysis of hydrogen peroxide using a continuous-flow photoreactor

Mahbub, Parvez; Smallridge, Andrew J.; Irtassam, Asjid; Yeager, Thomas R.

doi:10.1016/j.cej.2021.131762

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…Models developed to predict the degradation of TrOCs in surface water and wastewater effluents show good predictive power with • OH-based AOPs such as the O 3 /H 2 O 2 and UV/H 2 O 2 systems. , A key limitation has been parameterization of the DOM component of such models, as most require probe compound experiments to first obtain water-specific oxidant exposures during the treatment. While in situ probe measurement techniques are improving, most still require off-line experiments. − For example, the decay of O 3 and the • OH probe compound such as p -chlorobenzoic acid needs to be measured first to get ∫[O 3 ]d t and ∫[ • OH]d t values before using eq to predict the degradation. , The steady-state concentrations of • OH must also be obtained using p -chlorobenzoic acid or rhodamine B as a probe compound before using eq . , For AOPs with many types of RS, all the steady-state RS concentrations are needed (eq ). …”

Section: The Way Forwardmentioning

confidence: 99%

Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Yang

Rosario‐Ortiz

Lei

et al. 2022

Environ. Sci. Technol.

182

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Advanced oxidation processes (AOPs) can degrade a wide range of trace organic contaminants (TrOCs) to improve the quality of potable water or discharged wastewater effluents. Their effectiveness is impacted, however, by the dissolved organic matter (DOM) that is ubiquitous in all water sources. During the application of an AOP, DOM can scavenge radicals and/or block light penetration, therefore impacting their effectiveness toward contaminant transformation. The multiple ways in which different types or sources of DOM can impact oxidative water purification processes are critically reviewed. DOM can inhibit the degradation of TrOCs, but it can also enhance the formation and reactivity of useful radicals for contaminants elimination and alter the transformation pathways of contaminants. An indepth analysis highlights the inhibitory effect of DOM on the degradation efficiency of TrOCs based on DOM's structure and optical properties and its reactivity toward oxidants as well as the synergistic contribution of DOM to the transformation of TrOCs from the analysis of DOM's redox properties and DOM's transient intermediates. AOPs can alter DOM structure properties as well as and influence types, mechanisms, and extent of oxidation byproducts formation. Research needs are proposed to advance practical understanding of how DOM can be exploited to improve oxidative water purification.

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Section: The Way Forwardmentioning

confidence: 99%

Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Yang

Rosario‐Ortiz

Lei

et al. 2022

Environ. Sci. Technol.

182

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“…CHSE-214 cell lines were then also exposed to . OH radicals from 1 to 50 mM produced from the parent material of 50 mM H 2 O 2 in aqueous solutions using a custom built continuous fow photoreactor as previously described by Mahbub et al [9]. Wild amoebae extracted from gills were exposed to 10 mM-50 mM .…”

Section: Toxicity Of Hydroxyl Radicals and Hydrogen Peroxide Tomentioning

confidence: 99%

“…Terefore, in our subsequent in vitro investigation of wild amoebae as well as clonal NP presented in the following sections, 50 mM H 2 O 2 was employed as the parent material converted into various concentrations of hydroxyl radicals (10 mM to 50 mM . OH radicals) using our scalable photoreactor described elsewhere [9].…”

Section: Safe Limit Of Hydrogen Peroxide As a Parent Reagentmentioning

confidence: 99%

“…OH) radicals is quite challenging compared to other oxidisers, due to limited capacity for scalable production and lack of data regarding its efcacy in deactivation of NP. Recently, Mahbub et al [9] demonstrated a portable and inexpensive technique capable of scalable production (between 40-90 mM) of . OH radicals from relatively low concentrations of H 2 O 2 (between 0.1-5 M) in aqueous solution using a single continuous fow photoreactor.…”

Section: Introductionmentioning

confidence: 99%

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Prospect of Hydroxyl Radical Exposure during Seawater Bathing to Treat Amoebic Gill Disease in Atlantic Salmon

Mahbub

Yeager

2023

Aquaculture Research

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This study aims to undertake hydroxyl (.OH) radical-based preliminary investigations with a view to utilising seawater as a viable alternative to freshwater for the treatment of amoebic gill disease (AGD) in aquaculture industries. The study presents in vitro viability studies of clonal amoebae species to examine the effects of .OH radicals on both parasites and hosts. The study also assesses the toxicity to Chinook salmon cell lines (CHSE-214) in freshwater and 35 ppt seawater via continuous dosing of 35 mM .OH radicals and hydrogen peroxide (H2O2) for 1.5 to 4 hr, separately at 18°C and 15°C. Comparatively high viability of CHSE-214 (60% in .OH and 50% in H2O2) for a prolonged treatment of up to 4 hr in seawater at 15°C indicates suitability of low seawater temperature while using either .OH or H2O2 during bathing. The viability of CHSE-214 remained relatively stable in seawater (55%–60% in .OH and 50%–60% in H2O2), at both temperatures of 18°C and 15°C. However, at 15°C, a drastic reduction of viability of CHSE-214 in freshwater (from 80% to 48% in .OH and from 70% to 58% in H2O2) has indicated high variations in toxicity levels in freshwater at low temperature. Using DNA staining agents in flow cytometry, the in vitro viability study results in >22.5% mortality of clonal Neoparamoeba perurans (NP), an AGD causative agent, in 35 ppt seawater containing 35 mM .OH radicals via one-off dosing for 1 hour at 15°C. In addition, fast radical consumption is more pronounced in the case of .OH radicals as compared to H2O2 in both freshwater and seawater due to extreme reactivity of the former. Hence, this study suggests that .OH radicals are detrimental to the viability of NP in seawater, and thereby, establishes grounds for further in vivo investigations of using seawater supplemented with continuous dosing of .OH radicals for Atlantic salmon bathing as a treatment of AGD.

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“…Advanced oxidation processes (AOPs) can generate a variety of free radical ions, which can gradually decompose large organic matter into small organic matter until mineralization occurs. At present, advanced oxidation methods include Fenton oxidation [4][5][6], ozone oxidation [7,8], photolysis [9][10][11], photocatalysis [12,13], and ferrate (VI) catalytic oxidation [14][15][16], etc. It is worth mentioning that advanced oxidation technology (sulfate radical-based AOPs, SR-AOPs) based on persulfate (PS) that can produce sulfate radical ion (SO 4 − ) is also attracting increasing attention [17,18].…”

Section: Introductionmentioning

confidence: 99%

A Review of Activation Persulfate by Iron-Based Catalysts for Degrading Wastewater

Zhi

et al. 2021

Applied Sciences

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Advanced oxidation technology of persulfate is a new method to degrade wastewater. As the economy progresses and technology develops, increasingly more pollutants produced by the paper industry, printing and dyeing, and the chemical industry are discharged into water, causing irreversible damage to water. Methods and research directions of activation persulfate for wastewater degradation by a variety of iron-based catalysts are reviewed. This review describes the merits and demerits of advanced oxidation techniques for activated persulfate by iron-based catalysts. In order to promote the development of related research work, the problems existing in the current application are analyzed.

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Scalable production of hydroxyl radicals (.OH) via homogeneous photolysis of hydrogen peroxide using a continuous-flow photoreactor

Cited by 10 publications

References 37 publications

Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Prospect of Hydroxyl Radical Exposure during Seawater Bathing to Treat Amoebic Gill Disease in Atlantic Salmon

A Review of Activation Persulfate by Iron-Based Catalysts for Degrading Wastewater

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