Toxicity evaluation of bulk and nanosheet MoS2 catalysts using battery bioassays

Arefi-Oskoui, Samira; Khataee, Alireza; Ucun, Olga Koba; Kobya, Mehment; Hancı, Tuğba Ölmez; Arslan-Alaton, İdil

doi:10.1016/j.chemosphere.2020.128822

Cited by 30 publications

(15 citation statements)

References 48 publications

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“…The aim of this study was to quantify if the visible light photo-Fenton process carried out with lab-scale device is able to generate environmentally harmful by-products, thus if the device can be considered as "eco-friendly." Water samples before and after the degradation process of PP and PVC microplastics were collected as reported in "Degradation experiments" section and then submitted to a battery of three ecotoxicological bioassays that includes commonly adopted model organisms, representing different parts of the trophic chain (taxonomic groups) (Czech et al, 2014;Filella, 2015;Freitas et al, 2017;Arefi-Oskoui et al, 2021). The microparticles concentration adopted for "pre-treatment" samples ( 19 microplastics particles/liter) was established on the basis of literature data, that reports an average concentration of microplastics entering waste water treatment plants of 15.7 particles/liter (Murphy et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

et al. 2022

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Microplastic pollution is receiving increased attention due to the realization of its hazards to aquatic and human life. Researchers across the globe are attempting to remove microplastics before its entry into the ecosystem. Therefore, the present work focused on the removal of microplastic from water and studied the potential risks for marine organisms and the ecosystem. The removal of model microplastics, polypropylene (PP) and polyvinyl chloride (PVC), has been studied by using photo-Fenton process. ZnO nanorods coated with SnOx(x < 2) layer and decorated with zero valent iron (Fe0) nanoparticles was used as heterogeneous catalyst for the removal of the microplastics in continuous water flow device. The obtained results demonstrated that high degradation efficiency of PP and PVC microplastics was achieved in a relatively short time and more than 95% of the average particle volume was reduced after 1 week of irradiation. The environmental impact of the photo-Fenton process of the microplastics degradation was investigated by using an ecotoxicological approach. An ecosafety screening has been performed through a series of experiments (bioassays) under controlled conditions, testing water samples after the photo-Fenton degradation of microparticles using a lab scale device. The ecotoxicological impact has been investigated by applying a battery of certified bioassays (UNI EN ISO/EPA standardized techniques) on aquatic organisms at different trophic levels (bacteria, algae, invertebrates). The results obtained on the three model organisms (A. fischeri, P. subcapitata, and D. magna) revealed no toxic effect for samples collected both before and after the photo-Fenton process, thus showing the absence of toxic by-products development during the degradation process.

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Section: Discussionmentioning

confidence: 99%

Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

et al. 2022

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“…A more detailed description of the test procedure for both selected test organisms can be found elsewhere. [ 66,67 ] Residual peroxides in all tested samples were quenched with appropriate reagents prior to acute toxicity measurements for both studied organisms. Due to the moderate toxic effect sulfur‐containing compounds toward D. magna the acute toxicity test was not performed for the PS/UV‐C experiments.…”

Section: Methodsmentioning

confidence: 99%

UV‐C Activation of Peroxides for Bisphenol A Removal from a Real Water Sample

Öztürk

Ucun

Arslan-Alaton

2021

CLEAN Soil Air Water

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The peroxides peracetic acid (PAA) and percarbonate (PC) are applied for UV‐C‐based advanced oxidation of the endocrine disrupting micropollutant bisphenol A (BPA; 2 mg L−1 = 8.76 µm) in pure and tap water. Their performance is compared with the more conventional hydrogen peroxide (HP)‐ and persulfate (PS)‐activated UV‐C treatments. Acidic and neutral pH values, 4 and 7, result in faster BPA removals with HP‐ and PS‐activated UV‐C treatments, respectively, whereas higher BPA removal rates are obtained at acidic and alkaline pH values, 4 and 10, with the PC/UV‐C and PAA/UV‐C treatments, respectively. Increasing the peroxide concentrations enhances BPA removals with the exception of PC/UV‐C treatment where an asymptotic removal rate is ultimately reached due to the inhibitory effect of increasing alkalinity. The order of total organic carbon (TOC) removal for the BPA‐spiked tap water (TW) (TOC ≈ 5 mg L−1 with added BPA) is TOCPAA/UV‐C (16%) < TOCPS/UV‐C (24%) < TOCHP/UV‐C (27%) < TOCPC/UV‐C (35%). BPA removal is most negatively affected for the HP/UV‐C processes, whereas the PC/UV‐C process outperformed the other peroxide/UV‐C treatments in terms of TOC removal due to the differences in the reactivity/selectivity of the in situ formed free radical types that may become important when working with real water. The originally low toxicity toward the marine photobacterium Vibrio fischeri and the freshwater crustacean Daphnia magna fluctuated during photochemical treatments.

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“…Bulk MoS 2 can be exfoliated, obtaining few-layer nanosheets (FLMoS 2 ) and single-layer nanosheets (SLMoS 2 ) [ 29 , 30 ]. SLMoS 2 compared to bulk MoS 2 has intrinsic higher electronic conductivity and presents a direct gap of 1.7–1.9 eV, while bulk MoS 2 presents an indirect band gap of 1.1–1.3 eV [ 31 , 32 , 33 , 34 ]. This relatively small band gap of SLMoS 2 enables the use of visible light to perform photocatalytic reactions [ 35 , 36 ].…”

Section: Mos 2 Structure and Propertiesmentioning

confidence: 99%

“…Cicuendez et al [ 152 ] also observed good viability of mouse and human cells when exposed to MoS 2 flakes. A more comprehensive study on the toxicity of bulk and MoS 2 nanosheets was conducted to address the toxicity in various aquatic species of different taxonomic groups [ 34 ]. The EC50 was determined for four species: Vibrio fischeri , a marine Gram-negative photobacterium, Pseudokirchnerialla subcapitata , a freshwater microalga, Daphnia magna , a freshwater crustacean, and Spirodela polyrhiza , a freshwater duckweed.…”

Section: Environmental Impact Of Mos 2 -Based Comp...mentioning

confidence: 99%

MoS2 and MoS2 Nanocomposites for Adsorption and Photodegradation of Water Pollutants: A Review

Amaral

Daniel‐da‐Silva

2022

Molecules

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The need for fresh and conveniently treated water has become a major concern in recent years. Molybdenum disulfide (MoS2) nanomaterials are attracting attention in various fields, such as energy, hydrogen production, and water decontamination. This review provides an overview of the recent developments in MoS2-based nanomaterials for water treatment via adsorption and photodegradation. Primary attention is given to the structure, properties, and major methods for the synthesis and modification of MoS2, aiming for efficient water-contaminant removal. The combination of MoS2 with other components results in nanocomposites that can be separated easily or that present enhanced adsorptive and photocatalytic properties. The performance of these materials in the adsorption of heavy metal ions and organic contaminants, such as dyes and drugs, is reviewed. The review also summarizes current progress in the photocatalytic degradation of various water pollutants, using MoS2-based nanomaterials under UV-VIS light irradiation. MoS2-based materials showed good activity after several reuse cycles and in real water scenarios. Regarding the ecotoxicity of the MoS2, the number of studies is still limited, and more work is needed to effectively evaluate the risks of using this nanomaterial in water treatment.

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Toxicity evaluation of bulk and nanosheet MoS2 catalysts using battery bioassays

Cited by 30 publications

References 48 publications

Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

UV‐C Activation of Peroxides for Bisphenol A Removal from a Real Water Sample

MoS2 and MoS2 Nanocomposites for Adsorption and Photodegradation of Water Pollutants: A Review

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