Ozonation of organic compounds in water and wastewater: A critical review

Water Research, Journal Year: 2022, Volume and Issue: 213, P. 118053 - 118053

Published: Jan. 10, 2022

Ozonation has been applied in water treatment for more than a century, first disinfection, later oxidation of inorganic and organic pollutants. In recent years, ozone increasingly enhanced municipal wastewater ecosystem protection potable reuse. These applications triggered significant research efforts on the abatement efficiency contaminants ensuing formation transformation products. This endeavor was accompanied by developments analytical computational chemistry, which allowed to improve mechanistic understanding reactions. critical review assesses challenges ozonation impaired qualities such as wastewaters provides an up-to-date compilation kinetic findings reactions with dissolved matter, various functional groups (olefins, aromatic compounds, heterocyclic aliphatic nitrogen-containing sulfur-containing hydrocarbons, carbanions, β-diketones) antibiotic resistance genes.

Language: Английский

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Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(16), P. 11111 - 11131

Published: July 7, 2022

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

Language: Английский

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Dissolved Organic Matter Photoreactivity Is Determined by Its Optical Properties, Redox Activity, and Molecular Composition

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(16), P. 6703 - 6711

Published: April 11, 2023

Predicting the formation of photochemically produced reactive intermediates (PPRI) during irradiation dissolved organic matter (DOM) has remained challenging given complex nature this material and differences in PPRI mechanisms. We investigate role DOM composition photoreactivity using 48 samples that span range freshwater systems wastewater. relate quantum yields for excited triplet-state (fTMP), singlet oxygen (Φ1O2), hydroxylating species (Φ•OH) to determined spectroscopy, Fourier-transform ion cyclotron resonance mass spectrometry, electron-donating capacity (EDC). fTMP Φ1O2 follow similar trends are correlated with bulk properties derived from UV–vis spectra EDC. In contrast, no individual property can be used predict Φ•OH. At molecular level, subset is positively both Φ•OH EDC distinct formulas related Φ1O2, demonstrating •OH 1O2 formed different fractions. Multiple linear regressions each parameters multiple techniques, complementary methods ideal characterizing because technique only a DOM.

Language: Английский

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Hydroxyl radicals in ozone-based advanced oxidation of organic contaminants: A review

Environmental Chemistry Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 2, 2024

Language: Английский

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Mineral-mediated stability of organic carbon in soil and relevant interaction mechanisms

Eco-Environment & Health, Journal Year: 2024, Volume and Issue: 3(1), P. 59 - 76

Published: Jan. 3, 2024

Soil, the largest terrestrial carbon reservoir, is central to climate change and relevant feedback environmental health. Minerals are essential components that contribute over 60% of soil storage. However, how interactions between minerals organic shape transformation stability remains poorly understood. Herein, we critically review primary mechanisms, including sorption, redox reaction, co-precipitation, dissolution, polymerization, catalytic reaction. These interactions, highly complex with combination multiple processes, greatly affect through following processes: (1) formation or deconstruction mineral-organic association; (2) oxidative minerals; (3) polymerization (4) varying association according mineral transformation. Several pieces evidence related turnover during interaction in real eco-environment then demonstrated. We also highlight current research gaps outline priorities, which may map future directions for a deeper mechanisms-based understanding storage capacity considering its minerals.

Language: Английский

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Network-Based Methods for Deciphering the Oxidizability of Complex Leachate DOM with ^•OH/O₃ via Molecular Signatures

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

In landfill leachates containing complex dissolved organic matter (DOM), the link between individual DOM constituents and their inherent oxidizability is unclear. Here, we resolved molecular signatures of oxidized by •OH/O3 using FT-ICR MS, thereby elucidating resistance in concentrated leachates. The comprehensive gradual fragmentation leachate was then revealed through a modified machine-learning framework based on 43 key pathways during ozonation. Specifically, humic substances like acid (HA) fulvic (FA) were measured to be dominant fractions leachates, accounting for 35.9–51.7% total carbon, which consistent with observation three-dimensional fluorescence spectroscopy. According carboxyl-rich alicyclic molecules (CRAMs) or lignin-like most abundant components, comprising 40.2–54.5% all substances. machine learning modeling showed that weight important structural factor •OH O3 degradation (SHAP value 0.84), followed (DBE-O)/C (0.32), S/C (0.31), H/C (0.08). During attacking, unsaturated reduced compounds precursors. For transformation CRAMs-DOM, oxygen addition reactions found predominant O3-attacking process, along dealkyl carboxylic oxidation often resulted more complete DOM. This study proposed new integrating unraveling DOM's reactivity complexity, informs strategies managing

Language: Английский

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Selective Reactivity and Oxidation of Dissolved Organic Matter by Manganese Oxides

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(17), P. 12084 - 12094

Published: Aug. 25, 2021

Dissolved organic matter (DOM) varies widely across natural and engineered systems, but little is known about the influence of DOM composition on its reactivity with manganese oxides. Here, we investigate bulk molecular transformations 30 diverse samples after reaction acid birnessite (MnO2), a strong oxidant that may react in Mn-rich environments or treatment systems. The reduces Mn forms generally more aliphatic lower apparent weight. However, extent depends water type (e.g., wastewater, rivers) highly aromatic undergoes greater changes. Despite variability due to composition, aqueous products attributable oxidation phenolic precursors are identified waters analyzed by high-resolution mass spectrometry. number matched product formulas correlates significantly indicators aromaticity, such as double-bond equivalents (p = 2.43 × 10–4). At level, aromatic, lignin-like carbon reacts selectively all despite initial resulting formation wide range products. These findings demonstrate occurs also suggest pool composition-dependent linked source aromaticity.

Language: Английский

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Insights into Adsorption of Humic Substances on Graphitic Carbon Nitride

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(12), P. 7910 - 7919

Published: May 26, 2021

Graphitic carbon nitride (CN) has been widely used in environmental pollution remediation. However, the adsorption of organic compounds on CNs, which practical significance for application is poorly understood. For first time, this study systematically investigated behaviors and mechanisms humic substances (HSs), i.e., acid (HA) fulvic (FA), CNs derived from four typical precursors. Intriguingly, CN urea (CN-U) showed a great capacity HS due to its porous structure large surface area, with maximum amounts 73.24 51.62 mgC/g HA FA, respectively. The formation, influencing factors, relative contributions multiple interactions were thoroughly elucidated. was mainly mediated by electrostatic interactions, π–π H-bonding. dominance resulted being highly dependent pH ionic strength. components high aromaticity molecular weight preferentially adsorbed interactions. These largely affected amino groups tri-s-triazine units as well moieties aromatic rings oxygen-containing HSs.

Language: Английский

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Bromine Radical (Br^• and Br₂^•–) Reactivity with Dissolved Organic Matter and Brominated Organic Byproduct Formation

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(8), P. 5189 - 5199

Published: March 29, 2022

Dissolved organic matter (DOM) is a major scavenger of bromine radicals (e.g., Br• and Br2•-) in sunlit surface waters during oxidative processes used water treatment. However, the literature lacks quantitative measurements reaction rate constants between DOM information on extent to which these reactions form brominated byproducts. Based transient kinetic analysis with different fractions sources DOM, we determined for ranging from <5.0 × 107 (4.2 ± 1.3) 108 MC-1 s-1, are comparable those HO• but higher than Br2•- (k = (9.0 2.0) 104 (12.4 2.1) 105 s-1). attack aromatic antioxidant moieties via electron transfer mechanism, resulting Br- release minimal substitution into DOM. For example, total was less 0.25 μM (as Br) at environmentally relevant radicals' exposures ∼10-9 M·s. The results give robust evidence that scavenging by crucial step prevent inorganic radical chemistry producing free (HOBr/OBr-) subsequent

Language: Английский

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Unraveling dissolved organic matter in drinking water through integrated ozonation/ceramic membrane and biological activated carbon process using FT-ICR MS

Water Research, Journal Year: 2022, Volume and Issue: 222, P. 118881 - 118881

Published: July 19, 2022

Language: Английский

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