Evaluation of the mechanisms of adsorption of microcystins and nodularin-R onto rice husk-based biochar

Thenuwara, Sharmila I.; Kiridena, Hasaruwani S.; Kirchhoff, Jon R.; Isailović, Dragan

doi:10.1016/j.envadv.2022.100314

Cited by 8 publications

(6 citation statements)

References 56 publications

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“…According to the SEM images, the surface morphology of husk-based biochar exhibited an irregular defect structure (Figure A,B). The specific surface area and pore size were 194.66 m 2 /g and 0.963 nm, and these data were equivalent to other characterizations of husk-based biochar . These parameters are conducive to the physical adsorption of small-volume matrix impurity (such as pigment and mineral salt).…”

Section: Resultssupporting

confidence: 67%

“…The specific surface area and pore size were 194.66 m 2 /g and 0.963 nm, and these data were equivalent to other characterizations of husk-based biochar. 33 These parameters are conducive to the physical adsorption of small-volume matrix impurity (such as pigment and mineral salt). Simultaneously, the EDS measurement illustrated that the husk-based biochar mainly contained elements C, O, and N, and the surface O was obviously higher than other the elements (Figure 3C).…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Enantioselective Degradation and Bioactivity Mechanism of a New Chiral Fungicide Fluindapyr in Paddy Ecosystems

Tong

Meng

et al. 2023

J. Agric. Food Chem.

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Fluindapyr is a novel chiral succinate dehydrogenase inhibitor used to control fungal diseases. The enantioselective effects of fluindapyr in paddy ecosystems are unknown. We developed a new chiral determination method of fluindapyr using ultrahigh performance liquid chromatography tandem mass spectrometry. The absolute configuration of the fluindapyr enantiomers was identified by an electron circular dichroism model. A new husk-based biochar material was used to optimize and establish a QuEchERs method for paddy soil determination. Under anaerobic conditions, the half-lives of R-fluindapyr and S-fluindapyr in paddy soil were 69.6 and 101.8 days, respectively. R-fluindapyr degraded more rapidly than S-fluindapyr. S-fluindapyr was 87.8 times more active against Rhizoctonia solani than R-fluindapyr. The enantioselective bioactivity mechanism was illustrated by molecular docking between the fluindapyr enantiomers and SDH of R. solani. The binding powers of R-fluindapyr and S-fluindapyr to proteins were −32.12 and − 42.91 kcal/mol, respectively. This study reports the stereoselectivity of fluindapyr about determination, degradation, bioactivity, and its mechanism. It provides a foundation for an in-depth study of fluindapyr at the enantiomer level.

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Section: Resultssupporting

confidence: 67%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Enantioselective Degradation and Bioactivity Mechanism of a New Chiral Fungicide Fluindapyr in Paddy Ecosystems

Tong

Meng

et al. 2023

J. Agric. Food Chem.

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“…Hydrophilic interactions can also be involved during the binding of MCs and NOD-R onto treated corncob using polar functional groups in molecules and on the sorbent surface. Depending on the pH, D-glutamate, beta-methylaspartate, and guanidine groups can form hydrophilic interactions with polar functional groups on the treated corncob surface, such as hydroxyl [60,73]. In preliminary adsorption experiments, six MCs and NOD-R showed a similar percent removal by H 3 PO 4 -AC.…”

Section: Removal Of Mcs and Nod-r Using Biochar And H 3 Po 4 -Acmentioning

confidence: 96%

“…Micropores are classified as primary micropores (w < 0.7 nm) and secondary micropores (0.7 < w < 2 nm) [59]. Meanwhile, the length of MC-LR lies between 1.33 and 2.94 nm, and the maximum length of NOD-R is ~1.7 nm [60]. Therefore, when choosing proper sorbents for MC and NOD-R removal, it is crucial to determine the volumes of mesopores and secondary micropores that sorbent contains [28,61].…”

Section: Characterization Of the Pore Structurementioning

confidence: 99%

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Evaluation of Carbonized Corncobs for Removal of Microcystins and Nodularin-R from Water

Kiridena,

Thenuwara,

Kandage

et al. 2024

Separations

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Microcystins (MCs) and nodularins (NODs) are cyanotoxins that can be found in water bodies during cyanobacterial harmful algal blooms (cyanoHABs). Consumption of water contaminated with cyanotoxins leads to health risks for humans and animals. Herein, corncob-based biochar and activated carbon (AC) were initially investigated for the sorption of six common MC congeners (MC-RR, MC-YR, MC-LR, MC-LA, MC-LW, and MC-LF) and nodularin-R (NOD-R) from spiked water. Biochar was prepared by refluxing commercial corncob with HCl and heating it to 250, 300, or 350 °C. AC was prepared by chemical activation of corncob with H3PO4 at 500 °C under a nitrogen atmosphere. Low-temperature nitrogen adsorption measurements confirmed that H3PO4-AC has a higher specific surface area (≈1100 m2/g) and total pore volume (≈0.75 cm3/g) than biochar and commercial AC. H3PO4-AC showed the maximum efficacy, among all corncob-based sorbents, to remove MCs and NOD-R from water as confirmed by experiments that involved sample analyses by ultrahigh-pressure liquid chromatography-mass spectrometry (UHPLC-MS). The effect of natural organic matter (NOM) on the adsorption of MCs was checked by incubating sorbents with Lake Erie water collected during cyanoHABs from 2020 to 2022. The total concentration (extracellular and intracellular) of studied MC congeners ranged from 1.37 µg/L to 438.51 µg/L and 50 mg of H3PO4-AC completely removed them from 3 mL of lake water. The effect of water pH on cyanotoxin adsorption was studied at pH values of 5.5, 7.0, and 8.5 at both a lower (10 μg/L each) and a higher (50 μg/L each) toxin concentration. Removal was influenced by solution pH at both concentrations when using biochar, while only at higher toxin concentration when using H3PO4-AC. At higher MC and NOD-R concentrations, competitive adsorption was prominent, and overall, the adsorption increased at acidic pH (5.5). The study results suggest that processed corncobs can remove a significant amount of MCs and NOD-R from water, and the measured sorption capacity of H3PO4-AC was ~20 mg of MC-LR and NOD-R per g of this sorbent.

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Molecular Identification of Microcystin Synthetase Genes mcyE in Cyanobacteria Using PCR

Liyanage,

Kulasooriya,

Manage

et al. 2023

Protocols for Cyanobacteria Sampling and Detection of Cyanotoxin

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Evaluation of the mechanisms of adsorption of microcystins and nodularin-R onto rice husk-based biochar

Cited by 8 publications

References 56 publications

Enantioselective Degradation and Bioactivity Mechanism of a New Chiral Fungicide Fluindapyr in Paddy Ecosystems

Enantioselective Degradation and Bioactivity Mechanism of a New Chiral Fungicide Fluindapyr in Paddy Ecosystems

Evaluation of Carbonized Corncobs for Removal of Microcystins and Nodularin-R from Water

Molecular Identification of Microcystin Synthetase Genes mcyE in Cyanobacteria Using PCR

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