Experimental and modeling study of proton and copper binding properties onto fulvic acid fractions using spectroscopic techniques combined with two-dimensional correlation analysis

Li, Tingting; Song, Fanhao; Zhang, Jin; Tian, Shasha; Huang, Nannan; Xing, Baoshan; Bai, Yingchen

doi:10.1016/j.envpol.2019.113465

Cited by 31 publications

(24 citation statements)

References 57 publications

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“…22−25 The relative directions and specific sequences of DOM variations at the level of chromophore or fluorophore classes were identified during copper-binding processes. 23,26 However, to the best of our knowledge, there are no relevant studies exploring the subtle and sequential metal-binding responses of molecular classes in DBC/DOM. Joint correlation analyses of targeted heterogeneous fluorescence/mass datasets can facilitate a more holistic understanding of the above metalbinding properties of DBC/DOM.…”

Section: ■ Introductionmentioning

confidence: 99%

Novel Insights into the Molecular-Level Mechanism Linking the Chemical Diversity and Copper Binding Heterogeneity of Biochar-Derived Dissolved Black Carbon and Dissolved Organic Matter

Song

Shi

et al. 2021

Environ. Sci. Technol.

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Biochar-derived dissolved black carbon (DBC) varies in chemical composition and significantly affects the environmental fate of metal ions. However, the intrinsic molecular composition of DBC fractions and their molecular interaction mechanisms with metal ions remain unclear. We propose a novel, molecular-level covariant binding mechanism to comparatively interpret the heterogeneities, active sites, and sequential responses of copper binding with molecular compounds in DBC and natural dissolved organic matter (DOM). Relatively large proportions of lipid/aliphatic/peptide-like compounds with low mass distributions and lignin-like compounds with oxidized/unsaturated groups existed in acidic-and alkaline-extracted DBC, respectively. A larger percentage of tannin-like/condensed aromatic compounds and higher average conditional stability constants (logK̅ Cu ) of visible fluorescent components were found for DOM than for DBC. Overall, 200−320 Da and 320−480 Da molecular components contributed significantly to the logK̅ Cu values of UVA and visible fluorescent components, respectively, in DBC/DOM. Nitrogenous groups likely exhibited stronger binding affinities than phenolic/carboxylic groups. The sequential copper-binding responses of molecular compounds in DBC/DOM generally followed the order lipid/aliphatic/peptide-like compounds → tannin-like compounds → condensed aromatic compounds. These insights will improve the prediction of the potential effects of DBC on various contaminants and the risks of biochar application to ecosystems.

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Section: ■ Introductionmentioning

confidence: 99%

Novel Insights into the Molecular-Level Mechanism Linking the Chemical Diversity and Copper Binding Heterogeneity of Biochar-Derived Dissolved Black Carbon and Dissolved Organic Matter

Song

Shi

et al. 2021

Environ. Sci. Technol.

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“…has drawn much interest in the recent years. [ 11–14 ] Additionally, the capacity of HAs to sorb cationic and hydrophobic organic contaminants is impressive. HAs can effectively interact with these contaminants, through sorption or covalent bond formation, and thus affect their mobility and transformation in soil and sediments.…”

Section: Introductionmentioning

confidence: 99%

“…Although research that correlates HAs and FAs soil content with PPPs sorption has taken place, [ 21,22 ] the investigation related to their use as organic pollutants absorbents to remove contaminants from water, soil, and sewage sludge is limited. [ 3,8,19,20,13–24,5 ] Therefore, the purpose of this work was to find an environmentally friendly, low cost and high‐efficient way to reduce the levels of herbicides in drinking water. Lignite is the youngest type of coal and is located between the peat and brown coal on the caustobiolites scale.…”

Section: Introductionmentioning

confidence: 99%

Humic and Fulvic Acids as Specific Sorbents of Herbicides in Water

Vrantsi

Lakka

Bozinou

et al. 2021

CLEAN Soil Air Water

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The ability of humic and fulvic acids (isolated from lignite with a simple, quick, and inexpensive method) to bind the active ingredients of herbicides contaminating drinking water is evaluated. During this study drinking water samples are contaminated with formulated herbicides (imazamox or a mixture of thifensulfuron methyl and tribenuron methyl), while humic and fulvic acids are used as reducing agents. The maximum reducing ability presented by humic and fulvic acids is 72.72% for thifensulfuron methyl and tribenuron methyl and 37.52% for imazamox. Humic acids’ binding ability is superior to that of fulvic acids.

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“…Among various metal ions, copper ion (Cu 2+ ) [9][10][11] and mercury ion (Hg 2+ ) [12,13], were the most frequently investigated species. Previous studies demonstrated that binding constants between Cu 2+ , Hg 2+ , and NOM could be up to 10 6 L/mol [14,15], leading to a decreased fluorescence intensity of NOM.…”

Section: Introductionmentioning

confidence: 99%

Binding of Calcium and Magnesium Ions to Chromophoric Dissolved Organic Matter (CDOM): A Combination of Steady-State and Time-Resolved Fluoresce Study

Zhang¹,

Liu²,

Zhou³

2021

Preprint

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Revealing the binding properties of calcium ion (Ca2+) and magnesium ion (Mg2+) to chromophoric dissolved organic matter (CDOM) facilities understanding the effect of natural water composition on the photophysics of dissolved organic matter. Steady-state and time-resolved fluorescence spectrometry, and dynamic light scattering were applied to investigate the fluorescence quenching process of CODM by Ca2+ and Mg2+. The binding of Ca2+ and Mg2+ preferred terrestrial CDOM to aquatic CDOM. The fluorescence quenching of CDOM by cations mainly occurred in a static process, which was based on the fact that the decrease of steady-state fluorescence intensity was greater than fluorescence lifetime. The fluorescence quenching was profound under longer excitation and emission wavelength. The binding constant (K, L/mol) for Ca2+ to CDOM from terrestrial source ranged from 4.29 to 5.09 (lgK), which was approximately one order of magnitude higher than that of Mg2+ to CDOM (3.86 to 4.56). Fluorescence decay became faster in the presence of Ca2+ and Mg2+. Lifetime distribution of CDOM excited states shifted to small value side in the presence of metal ions, particularly for Ca2+, indicating fluorescence quenching of CDOM mainly through the interaction of Ca2+/Mg2+ with relatively long-lived fluorophores.

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Experimental and modeling study of proton and copper binding properties onto fulvic acid fractions using spectroscopic techniques combined with two-dimensional correlation analysis

Cited by 31 publications

References 57 publications

Novel Insights into the Molecular-Level Mechanism Linking the Chemical Diversity and Copper Binding Heterogeneity of Biochar-Derived Dissolved Black Carbon and Dissolved Organic Matter

Novel Insights into the Molecular-Level Mechanism Linking the Chemical Diversity and Copper Binding Heterogeneity of Biochar-Derived Dissolved Black Carbon and Dissolved Organic Matter

Humic and Fulvic Acids as Specific Sorbents of Herbicides in Water

Binding of Calcium and Magnesium Ions to Chromophoric Dissolved Organic Matter (CDOM): A Combination of Steady-State and Time-Resolved Fluoresce Study

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