Enhanced photocatalytic degradation of dyes using a novel waste toner-based TiO2/Fe2O3@nanographite nanohybrid: A sustainable approach

Water Science and Engineering, Год журнала: 2024, Номер 17(3), С. 226 - 235

Опубликована: Янв. 23, 2024

This study synthesized a ferric oxide–nanographite (NG) nanocomposite (Fe2O3@NG) from waste toner powder through carbonization. Subsequently, TiO2/Fe2O3@NG nanohybrid was fabricated using the sol-gel technique to improve photocatalytic degradation of dyes. nanocomposites were prepared at TiO2:Fe2O3@NG ratios 2:1 (Ti:T-21), 1:1 (Ti:T-11), and 1:2 (Ti:T-12). The porosity, morphology, surface chemistry, chemical interactions between TiO2, Fe2O3, graphite in characterized Brunauer–Emmett–Teller (BET) method microscopic spectroscopic analyses. exhibited reduced bandgap (2.4 2.9 eV) enhanced charge carrier separation transfer junction hetero-structured nanohybrid. Preliminary experiments revealed that Ti:T-21 most effective photocatalyst for degrading acid blue-25 (AB-25) compared Ti:T-11, Ti:T-12, sole Fe2O3@NG. also investigated impacts catalyst dose initial dye concentration on AB-25 degradation. Notably, 97% 5-mg/L removed 1.25-g/L an unmodified pH 6.4 within 120 min. Furthermore, remarkable recyclability its immobilized form, achieving 74.7% 71.8% over five consecutive runs, removal efficiencies 85.0% 62.3% suspended mode. Trapping identified hydroxyl radicals, holes, superoxide as principal reactive radicals. TiO2/Fe2O3@NG/light system disintegrating mineralizing other synthetic dyes such Congo red, methylene blue, methyl indicating potential industrial-scale authentic wastewater. utilization water treatment is highlighted strategy promote environmental sustainability, foster circular economy, contribute pollution remediation.

Язык: Английский

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Environmental epigenetics: Exploring phenotypic plasticity and transgenerational adaptation in fish

Environmental Research, Год журнала: 2024, Номер 252, С. 118799 - 118799

Опубликована: Март 27, 2024

Язык: Английский

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Chemical characterization and source attribution of organic pollutants in industrial wastewaters from a Chinese chemical industrial park

Environmental Research, Год журнала: 2023, Номер 229, С. 115980 - 115980

Опубликована: Апрель 23, 2023

Язык: Английский

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Identifying Candidate Persistent, Mobile, and Toxic (PMT) and Very Persistent and Very Mobile (vPvM) Substances in Shale Gas Drilling Fluids by Combining Nontarget Analysis and Machine Learning Model

Environmental Science & Technology Letters, Год журнала: 2024, Номер 11(2), С. 114 - 121

Опубликована: Янв. 22, 2024

Shale gas extraction has raised environmental concerns on regional water resources. Horizontal drilling is a process in which fluids containing complex organic and inorganic chemicals are intensively applied. Accidental spill improper disposal of related wastes might pose risks to surrounding groundwater environment. Given ground quality, persistent, mobile, toxic (PMT) very persistent mobile (vPvM) substances should be particular attention. However, recent research rarely focused chemical compositions fluids, the harmful PMT/vPvM remain unknown. In this study, we utilized nontarget screening strategy detect identify compounds collected southwest China. Specifically, total number 371 were detected main fraction was alicyclic compounds. Later, an original machine learning model developed by us applied candidate among Our study identified 29 substances, thus providing list prioritized for early warning risk assessment contamination.

Язык: Английский

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Variable K_OC and Poor-Quality Data Sources Cause High Discrepancy in Current Mobility Assessment of Organic Substances

ACS ES&T Water, Год журнала: 2025, Номер unknown

Опубликована: Янв. 10, 2025

The widespread distribution of persistent, mobile, and toxic organic chemicals (PMT) in aquatic environments poses a threat to water resources. Current mobility assessments rely on the carbon normalized adsorption coefficient (KOC), but it is sometimes highly variable with sorptive phase (soil/sediment) properties. There common oversight that this variability causes assessment discrepancies. Herein, was quantitatively evaluated based compiled experimental KOC data sets, which were obtained under OECD guidelines. results show both average discrepancy rate relative difference are nearly half those substances among recent reports. underlying reasons high poor-quality sources fail capture variability. variation values for one-third charged compounds more than 1 order magnitude, around twice higher neutral compounds. from integrated databases or available quantitative structure–property relationships all have almost orders magnitude differences compared especially insights presented here significant value future development proper assessment.

Язык: Английский

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The Active Soil Layer of Thawing Permafrost Is an Emergent Source for Organic Substances of Concern to Water Resources

Environmental Science & Technology Letters, Год журнала: 2025, Номер unknown

Опубликована: Апрель 21, 2025

The Tibetan Plateau and surrounding area are an important source of freshwater for approximately two billion people. Climate change has aggregated permafrost degradation in the over last few decades, mobilizing organic substances sequestrated permafrost. Of particular concern mobilized that would be considered persistent, mobile, toxic (PMT) or very persistent mobile (vPvM). These PMT vPvM persist widespread downstream water distribution system, potentially threatening drinking sources groundwater quality. Our study evaluated identified among 21 currently available literature reports reported detected compounds active soil approach combined a standard evaluation scheme machine learning model. We 34% these PMT/vPvM substances; were either synthetic, natural, undefined origin. impact further will have on releasing resources should prioritized.

Язык: Английский

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A Method of Water COD Retrieval Based on 1D CNN and 2D Gabor Transform for Absorption–Fluorescence Spectra

Micromachines, Год журнала: 2023, Номер 14(6), С. 1128 - 1128

Опубликована: Май 27, 2023

Chemical Oxygen Demand (COD) is one of the indicators organic pollution in water bodies. The rapid and accurate detection COD great significance to environmental protection. To address problem retrieval errors absorption spectrum method for fluorescent matter solutions, a synchronous absorption-fluorescence proposed. Based on one-dimensional convolutional neural network 2D Gabor transform, an fusion algorithm developed improve accuracy retrieval. Results show that RRMSEP 0.32% amino acid aqueous solution, which 84% lower than single method. 98%, 15.3% higher test results actual sampled spectral dataset demonstrate outperformed CNN measuring accuracy, with improving from 5.09% 1.15%.

Язык: Английский

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Hazard vs. exposure: Does it make a difference in identifying chemicals with persistence and mobility concerns?

Water Research, Год журнала: 2023, Номер 245, С. 120610 - 120610

Опубликована: Сен. 10, 2023

Persistent and mobile (PM) chemicals are considered emerging threats to the environment drinking water because they can be transported over long distances, penetrate natural artificial barriers, resist removal by traditional treatment procedures. Current chemical regulatory frameworks raise concerns PM due their potential cause high human exposure through contamination. However, criteria used screen identify these often rely on hazard properties related stability sorption, such as biodegradation half-lives organic-carbon-normalized sorption coefficients respective measures of P M. Here, we conduct a model-based assessment examine consistency between hazard-based exposure-based approaches in assessing chemicals, evaluating whether identified highly M consistently associated with (DWEP). We discover that top DWEPs tend but reverse is not always true, also impacted volatilization for air-distributed advective particle-bound transport chemicals. Our findings suggest metrics better suited de-prioritizing, opposed prioritizing, unlikely result significant water, unfavorable values necessary sufficient condition DWEP. find distinct mechanisms determine DWEP different sources water: Sorption more influential groundwater surface respectively, whereas both equally impact undergoing riverbank filtration. Future studies should focus optimizing identification persistent ensure taken into consideration.

Язык: Английский

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Subchronic Effects of Tetrachloroethylene on Two Freshwater Copepod Species: Implications for Groundwater Risk Assessment

Environmental Toxicology and Chemistry, Год журнала: 2024, Номер 43(12), С. 2515 - 2527

Опубликована: Авг. 26, 2024

Abstract Aliphatic chlorinated hydrocarbons, notably tetrachloroethylene (also known as perchloroethylene [PCE]), are persistent, mobile, and toxic (PMT) and/or very (vPMT) groundwater pollutants, often exceeding safe drinking water thresholds. The present study delves into the risk assessment of PCE with a novel focus on sensitivity stygobitic species—organisms uniquely adapted to environments. Through comparative analysis subchronic effects locomotion behavior two copepod species, Moraria sp. nonstygobitic Bryocamptus zschokkei , we highlighted inadequacy current European predicted‐no‐effect concentration for ecosystems. Our findings indicate significant behavioral impairments in both species at (32 ng/L PCE) well below threshold deemed safe, suggesting that guidelines may not adequately protect unique biodiversity habitats. Importantly, B. demonstrated comparable or greater than target its utility substitute assessment. adds limited research ecotoxicological PMT/vPMT chemicals highlights need refined risk‐assessment methodologies consider susceptibilities species. Environ Toxicol Chem 2024;43:2515–2527. © 2024 Author(s). Environmental Toxicology Chemistry published by Wiley Periodicals LLC behalf SETAC.

Язык: Английский

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Determining high priority disinfection byproducts based on experimental aquatic toxicity data and predictive models: Virtual screening and in vivo study

The Science of The Total Environment, Год журнала: 2024, Номер 951, С. 175489 - 175489

Опубликована: Авг. 13, 2024

Язык: Английский

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