Molecular characteristics of leonardite humic acid and the effect of its fractionations on sulfamethoxazole photodegradation

Zhang, Yiyue; Zhao, Furong; Wang, Fei; Zhang, Yahe; Shi, Quan; Han, Xiaomin; Geng, Huanhuan

doi:10.1016/j.chemosphere.2019.125642

Cited by 28 publications

(9 citation statements)

References 56 publications

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“…Then, the distribution of the selected SOM components was shown by the van Krevelen diagram, , which plots H/C against O/C ratios (Figure S2). The observed H/C and O/C ratios in the LHA molecules, ranging from 0.54 to 1.13 and 0.37 to 0.71, respectively, align with Zhang et al’s findings of 0.4 to 1.5 and 0.1 to 0.8, respectively, for the same ratios . According to the obtained results, the K ow values of the selected components spanned 24 orders of magnitude.…”

Section: Resultssupporting

confidence: 90%

“…The observed H/C and O/C ratios in the LHA molecules, ranging from 0.54 to 1.13 and 0.37 to 0.71, respectively, align with Zhang et al's findings of 0.4 to 1.5 and 0.1 to 0.8, respectively, for the same ratios. 10 According to the obtained results, the K ow values of the selected components spanned 24 orders of magnitude. The lg K ow values ranged from −9.60 to 14.25, indicating that the overall model reflected the diversity and complexity of the SOM structure and, therefore, can be used to represent the SOM heterogeneity.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

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Dynamic Behavior and Interaction Mechanism of Soil Organic Matter in Water Systems: A Coarse-Grained Molecular Dynamics Study

Xue,

Jiao,

Liu

et al. 2023

Environ. Sci. Technol.

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Investigating soil organic matter's (SOM) microscale assembly and functionality is challenging due to its complexity. This study constructs comparatively realistic SOM models, including diverse components such as Leonardite humic acid (LHA), lipids, peptides, carbohydrates, and lignin, to unveil their spontaneous self-assembly behavior at the mesoscopic scale through microsecond coarse-grained molecular dynamics simulations. We discovered an ordered SOM aggregation creating a layered phase from its hydrophobic core to the aqueous phase, resulting in an increasing O/C ratio and declining structural amphiphilicity. Notably, the amphiphilic lipids formed a bilayer membrane, partnering with lignin to constitute SOM's hydrophobic core. LHA, despite forming a layer, was embedded within this structure. The formation of such complex architectures was driven by nonbonded interactions between components. Our analysis revealed component-dependent diffusion effects within the SOM system. Lipids, peptides, and lignin showed inhibitory effects on self-diffusion, while carbohydrates facilitated diffusion. This study offers novel insights into the dynamic behavior and assembly of SOM components, introducing an effective approach for studying dynamic SOM mechanisms in aquatic environments.

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Section: Resultssupporting

confidence: 90%

Section: ■ Results and Discussionmentioning

confidence: 95%

Dynamic Behavior and Interaction Mechanism of Soil Organic Matter in Water Systems: A Coarse-Grained Molecular Dynamics Study

Xue,

Jiao,

Liu

et al. 2023

Environ. Sci. Technol.

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“…Both oxybenzone and bisphenol A contain hydroxyl functional groups and thus their degradation was not reduced in the presence of humic acid. On the other hand, in good agreement with our study, Zhang et al [50] observed a slight inhibitory effect of humic acid (20 mg/L) on the photodegradation of sulfamethoxazole. Similarly, Wang et al [51] observed reduced degradation of carbamazepine in the presence of humic acid.…”

Section: Effect Of Humic Acid On Troc Removal By Dcmd-uv Photolysissupporting

confidence: 93%

Impact of Inorganic Ions and Organic Matter on the Removal of Trace Organic Contaminants by Combined Direct Contact Membrane Distillation–UV Photolysis

2020

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This study investigated the degradation of five trace organic contaminants (TrOCs) by integrated direct contact membrane distillation (DCMD) and UV photolysis. Specifically, the influence of inorganic ions including halide, nitrate, and carbonate on the performance of the DCMD–UV process was evaluated. TrOC degradation improved in the presence of different concentrations (1–100 mM) of fluoride ion and chloride ion (1 mM). With a few exceptions, a major negative impact of iodide ion was observed on the removal of the investigated TrOCs. Of particular interest, nitrate ion significantly improved TrOC degradation, while bicarbonate ion exerted variable influence—from promoting to inhibiting impact—on TrOC degradation. The performance of DCMD–UV photolysis was also studied for TrOC degradation in the presence of natural organic matter, humic acid. Results indicated that at a concentration of 1 mg/L, humic acid improved the degradation of the phenolic contaminants (bisphenol A and oxybenzone) while it inhibited the degradation of the non-phenolic contaminants (sulfamethoxazole, carbamazepine, and diclofenac). Overall, our study reports the varying impact of different inorganic and organic ions present in natural water on the degradation of TrOCs by integrated DCMD–UV photolysis: the nature and extent of the impact of the ions depend on the type of TrOCs and the concentration of the interfering ions.

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“…Among biostimulants, leonardite, due to the high percentage of humic acids, is considered a bioactive compound suitable to preserve soil integrity (Turgay et al, 2010). Organic molecules (phenolic and alcohol compounds) contained in leonardite can be used by microbes as a source of nitrogen and carbon (Conselvan et al, 2017;Zhang et al, 2020). Consequently, the microbiome change following leonardite applications may be Student t-test was applied to verify the statistical significance between groups (p < 0.05; n.s., not significant).…”

Section: Discussionmentioning

confidence: 99%

Novel Effects of Leonardite-Based Applications on Sugar Beet

et al. 2021

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The present study aimed to explore the effects of foliar application of a leonardite-based product on sugar beet (Beta vulgaris L.) plants grown in the field. The approach concerned the evaluation of the community compositional structure of plant endophytic bacteria through a metabarcoding approach, the expression level of a gene panel related to hormonal metabolism and signaling, and the main sugar beet productivity traits. Results indicated that plants treated with leonardite (dosage of 2,000 ml ha–1, dilution 1:125, 4 mg C l–1) compared with untreated ones had a significant increase (p < 0.05) in (i) the abundance of Oxalicibacterium spp., recognized to be an endophyte bacterial genus with plant growth-promoting activity; (ii) the expression level of LAX2 gene, coding for auxin transport proteins; and (iii) sugar yield. This study represents a step forward to advance our understanding of the changes induced by leonardite-based biostimulant in sugar beet.

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Molecular characteristics of leonardite humic acid and the effect of its fractionations on sulfamethoxazole photodegradation

Cited by 28 publications

References 56 publications

Dynamic Behavior and Interaction Mechanism of Soil Organic Matter in Water Systems: A Coarse-Grained Molecular Dynamics Study

Dynamic Behavior and Interaction Mechanism of Soil Organic Matter in Water Systems: A Coarse-Grained Molecular Dynamics Study

Impact of Inorganic Ions and Organic Matter on the Removal of Trace Organic Contaminants by Combined Direct Contact Membrane Distillation–UV Photolysis

Novel Effects of Leonardite-Based Applications on Sugar Beet

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