WATER RESEARCH
·
2026
·
IF 12.8
Chao Zhu,Hao Liu,Kuan Sun,Jingyu Hu,Jiefei Mao,Qile Fang,Junliang Wang,Shuang Song,Yi Shen
Dissolved organic matter (DOM), ubiquitous in natural and treated waters, strongly modulates photocatalytic processes by regulating interfacial electron and energy transfer. However, the component-specific effects of different DOM types, particularly microplastic-derived DOM (MP-DOM), on photocatalyst-pollutant interfacial photochemistry remain poorly understood. In this study, we developed a nitrogen-vacancy engineered covalent triazine framework (N V -CTF-0.03) as a visible-light-driven photocatalyst, which exhibited enhanced adsorption and strong resilience to interference from coexisting DOM. The photocatalytic degradation of bisphenol A (BPA) and naphthalene (NAP) was systematically assessed in the presence of humic acid (HA) and MP-DOM (PE-, PS-, and PET-DOM), and •O 2 − was identified as the dominant reactive oxygen species (ROS). Competitive kinetic analysis revealed strong DOM-dependent modulation. HA suppressed ROS generation, likely via competitive light absorption or quenching, whereas PET-DOM markedly promoted ROS production through π-π interactions and defect-site coordination, facilitating directional electron transfer. Mechanistic investigations integrating 3D excitation-emission matrix fluorescence combined with fluorescence regional integration (3D EEM-FRI), electron transfer capacity measurements, and density functional theory (DFT) calculations indicate that PET-DOM, enriched in oxygenated functional groups and fulvic acid-like moieties, enhances N V -CTF-0.03 photocatalysis via dual pathways, mediating energy transfer to promote O 2 reduction to •O 2 − and facilitating interfacial electron-hole separation through its distinctive electron donor-acceptor properties. These findings establish PET-DOM as a component-specific photochemical mediator and provide mechanistic guidance for designing DOM-resilient, high-performance photocatalysts in complex aquatic systems.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124575
·
IF 7.5
Minhui Cai,Ruize Xia,Zheng Wang,Jun Li,Qing Zhou,Yan Li,Wentao Li,Aimin Li
Certain Fe(III) compounds are utilized to stimulate dissimilatory iron reduction (DIR), thereby accelerating the transformation of dissolved organic matter (DOM) during anaerobic digestion. The effects of four specific Fe(III) compounds—Fenton sludge (FS), ferrihydrite, Fe 2 O 3 , and Fe(OH) 3 —on DOM evolution and microbial function dynamics during anaerobic digestion were investigated in this study. Batch experiments revealed that the FS exhibited superior performance in DIR efficiency and DOM transformation compared to other Fe(III) compounds, which is attributed to its relatively low crystallinity that enhances bioavailability and the higher predicted relative abundance of pil A gene, which is consistent with enhanced extracellular electron transfer. Combined size exclusion chromatography and fluorescence excitation emission matrix analysis demonstrated that the FS effectively degraded and transformed medium molecular weight humic-like substances. Furthermore, pathway analysis confirmed that the FS augmented acidification efficiencies, triggered by elevated activity of the propionate CoA-transferase pathway. Five genera, including Paludibacter , Macellibacteroides , Bact-08 , TM7a , and Clostridium sensu stricto 12 , were identified as keystone genera via network analysis. These genera maintained the bacterial community’s functional stability through their potential involvement in the DIR process and regulation of organic matter metabolism. Overall, these findings highlight FS as a promising Fe(III) source that drives efficient DIR-coupled DOM transformation, suggesting its potential for the resource recovery of Fenton sludge.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 21
·期 7
·5217-5226
·
IF 2.757
Peng Na,Wang Kaifeng,Liu Guoguang,Li Fuhua,Yao Kun,Lv Wenying
Beta blockers are widely used pharmaceuticals that have been detected in the environment. Interactions between beta blockers and dissolved organic matter (DOM) may mutually alter their environmental behaviors. To assess this potential, propranolol (PRO) was used as a model beta blocker to quantify the complexation with DOM from different sources using the fluorescence quenching titration method. The sources of studied DOM samples were identified by excitation–emission matrix spectroscopy (EEMs) combined with fluorescence regional integration analysis. The results show that PRO intrinsic fluorescence was statically quenched by DOM addition. The resulting binding constants (log K
oc ) ranged from 3.90 to 5.20, with the surface-water-filtered DOM samples claiming the lower log K
oc and HA having the highest log K
oc . Log K
oc is negatively correlated with the fluorescence index, biological index, and the percent fluorescence response ( P
i ,n ) of protein-like region ( P
I,n ) and the P
i ,n of microbial byproduct-like region ( P
II,n ) of DOM EEMs, while it is correlated positively with humification index and the P
i ,n of UVC humic-like region ( P
III,n ). These results indicate that DOM samples from allochthonous materials rich in aromatic and humic-like components would strongly bind PRO in aquatic systems, and autochthonous DOM containing high protein-like components would bind PRO more weakly.
研究领域:
环境科学
·
药理学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qian Hu,Ruigang Wang,Yanshun Gan,Ying Zhang,Huanzhong Bao,Lianbao Zhang,Guangzhou Qu,Tiecheng Wang
Dissolved organic matters (DOM) are important precursors for chlorinated disinfection by-products (DBPs). Little information is available regarding correlations among DOM removal, DBPs formation, and DBPs-associated toxicity in the plasma process. In this study, four sources of humic substances (HAⅠ, HAⅡ, HAIII, and HAIV) were chosen as the targeted DOM, and their removal performances and DBPs formation were investigated. The removal efficiencies of UV 254 for HAⅠ, HAⅡ, HAIII, and HAIV were 81.6%, 75.6%, 64.2%, and 79.5% after 60 min plasma treatment, respectively. Plasma oxidation resulted in conversion of high aromatic DOM to low molecular weight components. As a result, total DBP contents decreased by 68.1%, 59.4%, 41.6%, and 50.9% for HAⅠ, HAⅡ, HAIII, and HAIV after 60 min plasma oxidation, respectively. High aromatic components were the main precursors of trichloroacetic acid (TCAA) and trichloromethane; lower molecular weight components contributed to chloralhydrate formation. Reactivity and contents of N played major roles in dichloroacetonitrile formation. Total calculated toxicities of DBPs derived from HAI and HAⅡ decreased by 57.5% and 59.4% after 60 min treatment, respectively, while fewer changes were observed from HAIII and HAIV. Plasma oxidation significantly reduced C-DBPs toxicity, but more attention should be paid to N-DBPs toxicity with low C/N ratio.
研究领域:
环境科学
·
水处理工程
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Degui Gao,Yuefei Huang,Shungui Zhou,Bing Li,Guangqian Wang
Seawater, as an alternative magnesium (Mg) source, has the potential to improve the overall economic and environmental footprint of struvite production compared to the use of pure Mg salts. However, the presence of other ions in seawater may affect the migration of tetracyclines (TCs), commonly found in wastewater, potentially reducing the quality of the recovered product, and posing environmental risks. But these effect has not been illustrated before. This study investigated the impact of seawater on oxytetracycline (OTC) migration during struvite recovery from swine wastewater. Under varying pH levels and Mg/P molar ratios, the OTC content in recovered struvite was ranged from 19 to 103 μg/g, which was 6 to 43 μg/g when using MgCl 2 as Mg source. The key factor influencing OTC content was identified as Ca 2+ in seawater. The co-precipitation of hydroxyapatite (HAP) and the incorporation of dissolved organic matter (DOM) were the primary reasons for increased OTC content. Interactions between Ca 2+ on HAP surfaces and the carbonyl oxygen of OTC, along with ternary complex formations involving Ca 2+ , DOM, and OTC, facilitated OTC migration through adsorption onto struvite. Notably, increasing the Mg/P molar ratio reduced OTC enrichment due to the competition between Ca 2+ and Mg 2+ . Density functional theory (DFT) calculations supported these interfacial interactions. These findings enhanced the understanding of antibiotic migration during phosphorus (P) recovery using seawater as alternative Mg source and suggested solutions for reducing P recovery contamination in the future.
研究领域:
环境科学
·
水处理工程
·
抗生素污染研究
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Situ Mu,Dongxu Sun,Yuxiang Liu,Juan Li,Hongwei Zhang,Jie Wang
Dissolved organic matter (DOM) with complex functional groups affects the trace of binding and transformation of hexavalent chromium (Cr(VI)) in the environment. However, the mechanisms and quantitative indicators are still ambiguous. In this study, the perspectives of spectroscopy with synchronous and excitation-emission matrix (EEM) fluorescence, and ultraviolet-visible (UV–vis) were employed to probe the interaction of DOM and Cr(VI). The spectroscopic parameters with Dslope 240–280 (the slope of the log-transformed absorbance in the range of 240–280 nm), DSlope 325–375 (the slope of the log-transformed absorbance in the range of 325–375 nm), S R (the ratio of the slope of the log-transformed absorption coefficient with 275–295 nm to 350–400 nm), SFI (specific fluorescence intensities), AvgFI/AvgUVA (the ratio of average fluorescence to average UV), and SS (Stokes shift) of UV–vis and fluorescence were extracted to characterize the DOM properties. The UV–vis results showed carboxylic-like and total phenolic/carboxylic-like groups were contributed to the complexation of Cr, which resulted in forming macromolecular aggregates, however, the degree of participation of different functional groups was uneven and the binding sequence depended on the types of fractions especially the ratio of protein. Meanwhile, the EEM results proved interaction between DOM and Cr also affected the hydrophobicity and quantum yield of solutions. In addition, according to the change orders of substances and functional groups by Two-dimensional correlation spectroscopy (2DCOS) analysis, aromatic amino acids substances were much more sensitive binding onto Cr than fulvic-like fractions and humic-like fractions, and the mechanisms for Cr(VI) retention were developed. Statistical analysis results showed that S R and SFI were significantly correlated with the concentration of Cr(VI), and multiple linear regression models were developed to predict concentrations of Cr(VI). Moreover, it was found the goodness of fit of SFI was better than that of S R at low Cr concentrations, but opposite at high concentrations.
研究领域:
环境科学
·
分析化学
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Zhansheng Li,Baocheng Qu,Jingqiu Jiang,Tadiyose Girma Bekele,Hongxia Zhao
The photoactivity of dissolved organic matter (DOM) has a great impact on the photodegradation of organic pollutants in natural waters. In this study, the photodegradation of TBBPA was investigated under simulated sunlight irradiation in the presence of copper ion (Cu 2+ ), dissolved organic matter (DOM) and Cu-DOM complexation (Cu-DOM) to illustrate the effect of Cu 2+ on photoactivity of DOM. The rate of photodegradation of TBBPA in the presence of Cu-DOM complex was 3.2 times higher than that in pure water. The effects of Cu 2+ , DOM and Cu-DOM on the photodegradation of TBBPA were highly pH dependent and hydroxyl radical(·OH) responded for the acceleration effect. Spectral and radical experiments indicated that Cu 2+ had high affinity to fluorescence components of DOM, and acted as both the cation bridge and electron shuttle, resulting the aggregation of DOM and increasing of steady-state concentration of ·OH (·OH ss ). Simultaneously, Cu 2+ also inhibited intramolecular energy transfer leading to the decrease of steady-state concentration singlet oxygen ( 1 O 2ss ) and triplet of DOM ( 3 DOM ⁎ ss ). The interaction between Cu 2+ and DOM followed the order of conjugated carbonyl C O, COO − or C O stretching in phenolic groups and carbohydrate or alcoholic C O groups. With these results, a comprehensive investigation on the photodegradation of TBBPA in the presence of Cu-DOM was conducted, and the effect of Cu 2+ on the photoactivity of DOM was illustrated. These findings helped to understanding the potential mechanism of interaction among metal cation, DOM and organic pollutants in sunlit surface water, especially for the DOM-induced photodegradation of organic pollutants.
研究领域:
环境科学
·
水污染治理
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Jie Wang,Andrew J. Tanentzap,Yuanze Sun,Jia Shi,Jianguo Tao,Xiang Wang,Li Xu,Jia Ding,Bing Feng,Jing Gao,Dayi Zhang,Xiaofeng Cao
Microbial regulation of soil carbon sequestration is vulnerable to anthropogenic stressors, notably microplastic pollution. Microplastics can release carbon-based compounds that serve as potential substrates for soil heterotrophic microbes. The impact of this novel microplastic-derived dissolved organic matter (MP-DOM) on soil carbon cycling and the underlying mechanisms remain largely unexplored. Here, short-term soil microcosm experiments were conducted with MP-DOM sourced from pristine and aged microplastics to compare their effects on soil carbon respiration against natural dissolved organic matter (NOM). The underlying mechanisms are investigated by estimating the spectroscopic and molecular signatures of MP-DOM and NOM, and comparing their effects on soil microbial physiological properties. Our findings reveal that MP-DOM leads to 36.9–42.3% higher CO2 emissions from soils than NOM, attributed to its greater bioavailability. MP-DOM simultaneously stimulates greater microbial quantity, phenotypic activities, and carbon utilization efficiency because this carbon is more biochemically accessible than NOM. Network analysis indicates stronger interconnections among labile molecules and bacterial taxa in MP-DOM treatments compared to NOM-treated soils, suggesting enhanced microbial capacity to utilize the more readily available MP-DOM. This study demonstrates that MP-DOM accelerates soil microbial respiration by mediating their physiological traits, with potential implications for climate change.
研究领域:
环境科学
·
土壤微生物学
·
生物地球化学
·
气候变化
·
生态毒理学
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Environmental Chemistry and Ecotoxicology
·
2026
·
IF 12.3
Jiayin Jiang,Xiping Hou,Peili Tian,Xiaoyu Lai,Tao Jiang,Xianzhu Dai,Feng Luo,Caiyun Yang
Dissolved organic matter (DOM) released during cyanobacterial lysis induced by algicidal bacteria represents a poorly understood byproduct in biological bloom-control strategies, with limited understanding of its environmental behavior and ecological risks. This study characterized DOM generated during the algicidal action induced by sterile extracellular filtrates from Bacillus altitudinis G3 on Microcystis aeruginosa (DOM-G3). We compared it with DOM from healthy algae (DOM-Ma), focusing on differences in structural characteristics, degradation behavior, and biotoxicity under both without and with Cd 2+ -stressed conditions. DOM-G3 exhibited markedly higher aromaticity, hydrophobicity, molecular weight, and proportions of protein- and humic-like substances ( p < 0.05). These features contributed to its faster photodegradation (53.0%) and higher initial microbial degradation during the first day (64.6% at 25 °C) than DOM-Ma (27.0% and 55.5%, respectively, p < 0.01). However, after 14 days, DOM-G3 exhibited a slightly lower microbial degradation ratio than DOM-Ma (74.4% vs. 78.9%), indicating a shift toward long-term stability. Bioassays demonstrated that DOM-G3 exerted stronger intrinsic inhibition on M. aeruginosa growth. Under Cd 2+ co-exposure, DOM-G3 initially alleviated metal toxicity, but subsequently caused a 40.6% enhancement in algal mortality, revealing a composition-dependent biphasic effect. In contrast, DOM-Ma consistently mitigated Cd 2+ toxicity and promoted post-stress recovery. These findings provide the first evidence that DOM produced during algicidal bacteria–mediated cyanobacterial lysis possesses distinct structural features and composition-dependent ecological risks, particularly its potential to shift from protective to harmful roles under metal stress. The findings highlight the necessity of incorporating DOM-mediated risks into the environmental assessment and safe application of microbial bloom-control technologies.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Rui Zhang,Shaoyin Peng,Zhenbei Wang,Fei Qi,Chen Li,Yatao Liu,Fan Li,Amir Ikhlaq,Jolanta Kumirska,Ewa Maria Siedlecka,Oksana Ismailova,Zukhra Kadirova
Membrane fouling is a significant obstacle for ultrafiltration application in the water treatment field. This study investigates the synergistic effects of ferrate (Fe(VI)) oxidation and aluminum chloride (AlCl₃) coagulation on dissolved organic matter (DOM) removal and ultrafiltration membrane fouling alleviation. Four pretreatment strategies, coagulation (AlCl₃), oxidation (K₂FeO₄), coagulation followed by oxidation (C O), and oxidation followed by coagulation (O C) were compared. Results showed that the interaction between oxidation and coagulation generated more active species, including Al 13 , Al 30, and Fe 3+ . The collaboration of these species during the coagulation-oxidation-ultrafiltration (C-O-F) process achieved the highest DOM removal (73.6 % DOC and 80 % UV 254 ) and the lowest total membrane fouling. Specifically, DOM with high and medium-molecular-weight components could be effectively removed. Furthermore, the C O process formed larger and looser flocs with a diameter of 1100 μm and a fractal dimension of 1.32. With better DOM removal and floc properties, a porous cake layer without gel-like structure would accumulate on the ultrafiltration membrane surface during the C-O-F process, and fewer DOM deposited in the membrane pores, leading to lower physically reversible fouling and chemically reversible fouling. These results were verified by the SEM image of the fouled membrane, and the membrane pore diameter after physiochemical cleaning could be restored to 0.0117 ± 0.0086 μm. This study innovative reveals the mechanisms of synergistic effects between AlCl 3 and K 2 FeO 4 , which provides new insights for the sustainable development of ultrafiltration technology.
研究领域:
环境工程
·
水处理技术
·
膜科学
·
高级氧化技术
·
胶体与界面化学
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Water Supply
·
2023
·Vol. 23
·期 2
·727-737
·
IF 1.7
Sun Tianxiao,Tang Yulin,Qu Xinlu,Huang Yongjie,Liu TuoDong,Xu Bin,Tang Haihua,Zhang Tianyang,Gao Naiyun
Biological activated carbon filter backwash water (BAC FBW) removes pollutants from BAC filters in drinking water treatment plants. Characterizing the dissolved organic matter (DOM) in BAC FBW is of great significance for the recycling and treatment of backwash water. DOM pollution was monitored over a year using three-dimensional excitation–emission matrix fluorescence spectra. The dissolved organic carbon (DOC) concentration and fluorescence results showed that the DOC concentration reached the lowest value of 1.95 mg/L in the summer. The relative abundances of fluorescence components had a direct relationship with temperature variations. The soluble microbial products were enhanced greatly during cold seasons, while fulvic-acid-like and humic-acid-like compounds remained constant. Disinfection by-products (DBPs) formation potential and cytotoxicity were evaluated. The total haloacetonitriles (HANs), trihalomethanes (THMs), halonitromethanes (HNMs), and haloacetaldehyde (HALs) formation potentials ranged from 35.5 to 47.3 μg/L, 95.1 to 126 μg/L, 4.95 to 8.06 μg/L, and 43.4 to 53.0 μg/L in BAC FBW, respectively. Among all DBPs included in the calculation, the order of contribution to cytotoxicity was HANs > HALs > THMs > HNMs, respectively. Especially, HANs were much higher than the other DBPs, which should be controlled to avoid the biological risk of effluent quality. DOC concentration of backwash water reached its lowest value in the summer. Seasonal variations impacted the composition of DOM due to microbial activity. THMs were the main DBPs in the backwash water. The order of contribution to cytotoxicity was HANs > HALS > THMs > HNMs in backwash water.
研究领域:
环境科学
·
饮用水处理
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ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Jiayue Gao,Weiying Feng,Fang Yang,Jing Liu,Wenhong Fan,Ying Wang,Qi Zhang,Wenhuan Yang
The migration of organic matter in salinized lakes was critical in maintaining ecological balance and material circulation process of inland shallow lakes. To clarify the ecological and microbial mechanism of material transport and transformation, the microbial community structure and the characteristics of dissolved organic matter (DOM) in the sediment of Daihai Lake, a typical saline lake at the Yellow River Basin, were explored with three-dimensional excitation and emission matrix fluorescence (3DEEM), parallel factor analysis (PARAFAC) and 16 S rRNA techniques. The correlation between environmental factors, DOM composition and the bacterial community structure were also studied for identifying the key factors of community formation. DOM in the lake demonstrated both terrigenous and endogenous characteristics. Protein-like materials accounted for 74% of the total fluorescence intensity in the sediment, where 1127 species, 671 genera, 468 families, 157 classes, 317 orders, 59 phyla of microorganisms were detected. Among the top 10 abundant taxa of each level, Firmicutes, Actinobacterota, Acidimicrobiia and Alphaproteobacteria had the greatest influence on the composition and structure of DOM (|R| > 0.7, p < 0.01). Microbial metabolism was a key process of transforming sediment organic matter from terrestrial humic-like to protein-like matter, accounting for 81% of total fluorescence signal in saline lake samples, while salinity , temperature, dissolved oxygen and electrical conductivity also had significant impacts during the process (|R|>0.7, p < 0.05). The research provides fundamental data and enlightenment for the improvement of the saline inland lake environment .
研究领域:
环境科学
·
微生物学
·
水生生态学
·
湖泊学
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