Effect of hydrothermal temperature on the optical properties of hydrochar-derived dissolved organic matter and their interactions with copper (II) DOI Creative Commons

Licheng Ji,

Zhongpu Yu,

Qi Cao

et al.

Biochar, Journal Year: 2024, Volume and Issue: 6(1)

Published: June 25, 2024

Abstract Hydrothermal carbonization (HTC) has been regarded as a promising technique for turning wet biomass into hydrochar due to its low energy consumption, exhaust gas emissions, etc. In addition, is an important source of dissolved organic matter (DOM), which plays crucial part in the migration and destiny pollutants environmental medium. However, there are limited studies that focus on factors influence formation DOM hydrochar, such hydrothermal temperature. Therefore, current study comprehensively characterized optical properties within derived from sawdust (HDOM) under different temperatures (150–300 °C) by Ultraviolet–visible (UV–Vis) fluorescence spectroscopy, well complexation characteristic with Cu(II). The findings revealed carbon content HDOM reached peak 37.3 mg L −1 when temperature rose 240 °C then decreased increased. UV–Vis spectroscopy analysis showed absorption capacity at 275 nm increases reaches maximum value °C, indicating high promotes monocyclic aromatic compounds. High enhances aromaticity, hydrophobicity, humification degree HDOM, thus improving stability aromaticity. E3/E4 ratios all greater than 3.5, confirming main component fulvic acid, corresponds 3D-EEM Pearson's correlation coefficient analysis. index (HIX) increased rise (150–240 °C), observed three-dimensional excitation-emission matrix (3D-EEMs). After reaching HIX gradually dropped line trend DOC change. Moreover, bioavailability (BIX) was 1, readily bioavailable. Two microbial humic substances (C1 C4), humic-like substance (C2), protein-like (C3) were discovered integrating 3D-EEMs parallel factor (PARAFAC). Their intensity decreases Cu(II) concentration increases, complexes As rises, binding ability changes significantly, optimum 300 °C. Meanwhile, C2 strongest This research emphasizes significance determining evolution hydrochar-derived DOM, potential heavy metal migration, characteristics features. Graphical

Language: Английский

Dynamic interactions at the mineral–organic matter interface DOI
Markus Kleber, Ian C. Bourg, Elizabeth K. Coward

et al.

Nature Reviews Earth & Environment, Journal Year: 2021, Volume and Issue: 2(6), P. 402 - 421

Published: May 11, 2021

Language: Английский

Citations

657
Oxygen availability regulates the quality of soil dissolved organic matter by mediating microbial metabolism and iron oxidation DOI
Ye Li, Zengming Chen, Ji Chen

et al.

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(24), P. 7410 - 7427

Published: Sept. 23, 2022

Dissolved organic matter (DOM) plays a vital role in biogeochemical processes and determining the responses of soil (SOM) to global change. Although quantity DOM has been inventoried across diverse spatio-temporal scales, underlying mechanisms accounting for variability dynamics remain unclear especially upland ecosystems. Here, gradient SOM storage 12 croplands northeast China was used understand links between dynamics, microbial metabolism, abiotic conditions. We assessed composition, biodegradability, key biodegradable components DOM. In addition, mineral-associated (MAOM) enzyme activities, oxygen availability, texture, iron (Fe), Fe-bound matter, nutrient concentrations were quantified clarify drivers quality (composition biodegradability). The proportion increased exponentially with decreasing initial concentration due larger fractions depolymerized that rich small-molecular phenols proteinaceous components. Unexpectedly, composition decoupled from or MAOM, but significantly related enzymatic properties. These results indicate metabolism exhibited dominant generation. As declined, availability regulated enhanced its biodegradability mainly through mediating Fe oxidation. oxygen-induced oxidation Fe(II) Fe(III) removed complex compounds large molecular weight. Moreover, stimulated oxidase-catalyzed depolymerization aromatic substances, promoted production protein-like lower C/N acquisition ratio. changes temperature moisture will have impacts on regulating highlights importance integrating supply redox status improve model predictions carbon under climate

Language: Английский

Citations

71
New insights into carbon mineralization in tropical paddy soil under land use conversion: Coupled roles of soil microbial community, metabolism, and dissolved organic matter chemodiversity DOI Creative Commons
Dongming Wu,

Changqi Ren,

Dong Ren

et al.

Geoderma, Journal Year: 2023, Volume and Issue: 432, P. 116393 - 116393

Published: Feb. 22, 2023

Although the impact of land conversion on carbon mineralization in paddy soils has received increasing attention, coupled roles soil microdiversity and chemodiversity these processes are largely unknown. To address this issue, use from fields (PF) to vegetable (VF), rice-vegetable rotation (RV), abandoned (AL), were investigated study. The relationships between characteristics microbial community, metabolism physiology dissolved organic matter (DOM) analyzed. After conversion, enhanced AL RV, which 217.49% 183.02% that PF. In contrast, no significant change was observed VF, although anaerobic environment transformed into an aerobic one fungal richness/ diversity increased soil. This because directly regulated by DOM quantity labile carbon, indirectly community. Specifically, largest attributed strongest as had DOC contents, hydrophilic substances (e.g., carboxyl, carbohydrate, amino), abundant eutrophic taxa Actinobacteria Proteobacteria). VF mainly related more condensed aromatics oligotrophic microbes, fewer soil, resulting dominance recalcitrant carbon. also prevailed RV. However, RV showed moderate due having proper with high bioavailability. Collectively, results provide molecular insights a micro-chemodiversity perspective, highlights importance nutrient supply strategy.

Language: Английский

Citations

46
Spatial patterns and environmental functions of dissolved organic matter in grassland soils of China DOI Creative Commons
Peng Zhou, Long Tian,

Nigel Graham

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 28, 2024

Soil dissolved organic matter (DOM) is crucial to atmospheric, terrestrial and aquatic environments as well human life. Here, by characterizing DOM from 89 grassland soils throughout China, we reveal the spatial association between geochemistry in dry season vs annual ecosystem exchange cancer cases. The humic-like high molecular weight (3.4–25 kDa) fractions with lower biodegradability, decline northern southern regions of are correlated soil respiration net productivity at continental scale. <1.2 kDa proteinaceous could serve a geographical indicator nasopharyngeal incidence mortality, while 3.4–25 humified potentially associated pancreatic cases (P < 0.05). Our findings highlight that exploiting environmental functions mitigating negative impacts necessary, require actions tailored local conditions. critical processes humans. Here authors variations different playing varied roles carbon health.

Language: Английский

Citations

17
Manganese Dioxides Induce the Transformation and Protection of Dissolved Organic Matter Simultaneously: A Significance of Crystallinity DOI
Zhiqiang Wang, Haoran Zhao, Zihan Shi

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

Interactions between manganese dioxides (MnO2) and dissolved organic matter (DOM) have long been the subject of scientific inquiry. However, effect MnO2 crystallinity on DOM fate remains unclear. Herein, we comprehensively investigate adsorption, protection, mineralization by with various crystallinities (order crystallinity: γ-30 < γ-90 γ-120). The results show that adsorption is positively correlated specific surface area (SSA) MnO2; largest SSA adsorbs highest amount DOM, resulting in protection. γ-120 a smaller could induce Maillard reaction thereby promote formation geopolymerized matter, leading to reduced bioavailability DOM. Furthermore, capability mineralize decreases order > γ-30, it determined both Mn4+ hydroxyl radical (·OH) content. In particular, contribution radical-based oxidation ·OH 64.8, 47.4, 23.7% for γ-90, γ-120, respectively. We propose may significant but hitherto unexplored influence global carbon cycle over geological time.

Language: Английский

Citations

3
Molecular Dynamics and Light Absorption Properties of Atmospheric Dissolved Organic Matter DOI
Hongxing Jiang, Jun Li, Rong Sun

et al.

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(15), P. 10268 - 10279

Published: July 21, 2021

The light-absorbing organic aerosol referred to as brown carbon (BrC) affects the global radiative balance. linkages between its molecular composition and light absorption properties how environmental factors influence BrC are not well understood. In this study, atmospheric dissolved matter (ADOM) in 55 samples from Guangzhou was characterized using Fourier transform ion cyclotron resonance mass spectrometry measurements. abundant components ADOM were aliphatics peptide-likes (in structure), or nitrogen- sulfur-containing compounds elemental composition). of positively correlated with levels unsaturated aromatic structures. Particularly, 17 nitrogen-containing species, which identified by a random forest, variation well. Aggregated boosted tree model nonmetric multidimensional scaling analysis show that largely driven meteorological conditions anthropogenic activities, among biomass burning (BB) OH radical two important factors. often accumulate elevated BB emissions related secondary processes, whereas photolysis/photooxidation usually occurs under high solar radiance/•OH concentration. This study first illuminated at level provided clues for molecular-level research future.

Language: Английский

Citations

101
Biochar induced changes of soil dissolved organic matter: The release and adsorption of dissolved organic matter by biochar and soil DOI

Zhengjun Feng,

Zhenlian Fan,

Huiping Song

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 783, P. 147091 - 147091

Published: April 15, 2021

Language: Английский

Citations

80
Addition of biodegradable microplastics alters the quantity and chemodiversity of dissolved organic matter in latosol DOI
Miao Chen,

Xiongwei Zhao,

Dongming Wu

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 816, P. 151960 - 151960

Published: Nov. 26, 2021

Language: Английский

Citations

80
Macromolecular Characterization of Compound Selectivity for Oxidation and Oxidative Alterations of Dissolved Organic Matter by Manganese Oxide DOI
Jianchao Zhang, Amy M. McKenna, Mengqiang Zhu

et al.

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(11), P. 7741 - 7751

Published: May 11, 2021

Manganese (Mn) oxides can oxidize dissolved organic matter (DOM) and alter its chemical properties microbial degradability, but the compound selectivity for oxidation oxidative alterations remain to be determined. We applied ultrahigh mass spectrometry catalog macromolecular composition of Suwannee River fulvic acid (SRFA) before after by a Mn oxide (δ-MnO2) at pH 4 or 6. Polycyclic aromatic hydrocarbons, polyphenols, carbohydrates were more reactive in reducing δ-MnO2 than highly unsaturated phenolic (HuPh) compounds aliphatics, abundant HuPh contributed most (∼50%) overall reduction δ-MnO2. On average, oxidized species had higher molecular weights, aromaticity, carbon unsaturation degree, nominal state carbon, oxygen nitrogen contents lower hydrogen content compared unoxidized species. The decreased these indices increased content, with stronger changes pH. This DOM on polar mineral surfaces was selective shared similar rules adsorption. abiotic resembles degradation matter, oxide-oxidizable may useful index detection identification labile carbon.

Language: Английский

Citations

70
Spatial assessment of tap-water safety in China DOI
Mengjie Liu,

Nigel Graham,

Wenyu Wang

et al.

Nature Sustainability, Journal Year: 2022, Volume and Issue: 5(8), P. 689 - 698

Published: June 9, 2022

Language: Английский

Citations

64