JOURNAL OF CONTAMINANT HYDROLOGY
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2025
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IF 4.4
Jianxin Fan,Jiaxin Yang,Ting Duan,Yuchen Gong,Jiaoxia Sun
The widespread use of sulfamethoxazole (SMX) has led to pervasive antibiotic contamination in aquatic environments, where suspended particulate matter (SPM) serves as a critical mediator in the retention, transport, and fate of antibiotic pollutants within riverine ecosystems. However, existing research predominantly emphasizes adsorption mechanisms under static batch equilibrium conditions, overlooking the dynamic interplay between SPM and antibiotics across hydrodynamic conditions regimes.Thus, the dynamic adsorption process of SMX on SPM was investigated through a series of annular flume experiments, and the MIKE 21 model was employed to simulate the migration of SMX and SPM. Results showed that the SMX adsorption amounts decreased significantly with increasing flow velocity, and the SMX desorption would occur when hydrodynamic conditions changed suddenly, especially for the continuous enhancement in velocity. As hydrodynamics stabilized, the re-adsorption of SMX would occur. The adsorption process of SMX was related with the property changes of SPM, and the enhancement of hydrodynamic conditions can significantly weaken the surface complexation between SPM and SMX, further resulting in a decrease in the SMX adsorption amounts. Meanwhile, high flow velocity would cause more obvious pore filling of SMX on SPM and led the clearer SMX adsorption fluctuations under the varying the hydrodynamic conditions. The MIKE 21 simulations identified that the continuous enhanced hydrodynamics significantly prolonged the interaction time between SMX and SPM, while the weak hydrodynamics and high SPM concentrations could particularly slow the SMX diffusion downstream.
研究领域:
环境科学
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生态学
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DOI
PubMed
高影响因子
Water
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2025
·Vol. 17
·期 10
·1480
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IF 3
Huan Wang,Junjie Wu,Dengbo Yang,Yudao Chen,Yuan Xia
Managed aquifer recharge (MAR) is widely used globally. However, clogging events remain a major obstacle to long-term operations. This study investigated the effects of natural biofilms on the migration and deposition of suspended particles (SPs) at varying concentrations using column experiments and multiple analytical methods. At 74 h, theK′ in the high-concentration group (HT) with biofilm coating decreased by 77.3%, while, in the high-concentration group (HTCK) without biofilm coating, theK′ decreased by 68.5%. Within the same recharge time, theK′ in the medium-concentration group without biofilm coating decreased by 59.9%. The results show that the biofilm covering the porous medium promotes the clogging of suspended particles. Compared with the high-concentration group, the development of porous medium blockage was slower in the low-concentration suspended particle group. SEM and CT analyses revealed that the biofilms altered the surface roughness of the porous media, thereby promoting SP deposition. The study also confirmed that the interactions between SPs and biofilms in recharge water, including electrostatic interactions, hydrophobic interactions, and extracellular polymer flocculation, collectively exacerbated the clogging process in MAR. XDLVO analysis indicated that the biofilm-coated porous media reduced the electrostatic interaction potential energy and energy barrier between SPs and quartz sand, thereby facilitating kaolin deposition in saturated porous media. Correlation and significance analyses identified hydrophobic interactions as the primary mechanism driving SP–biofilm combined with clogging. Moreover, the reduced SP concentrations in the recharge water increased the SP migration distance in porous media, slowing the clogging progression in low-SP groups. These findings offer valuable insights into the prevention and management of MAR clogging caused by the coexistence of biofilms and SPs.
研究领域:
环境科学
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水文学
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DOI
高影响因子
CHEMOSPHERE
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2013
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IF 3.137
Xiaoyan Zhang,Peiyong Guo,Jinxiu Huang,Xiufu Hou
Suspended particles are a natural component of aquatic ecosystems. This study provides a report on the survival, growth and reproduction of common-scale and nanoscale particles of Daphnia magna Straus exposed to five types of particles (i.e. KN (kaolinite), MN (montmorillonite), MNn (nanoscale MN), NP (natural particles), and NPn (nanoscale NP)). The results of the study show that the suspended particles elicited a dose-dependent toxicity in KN, MN and MNn, with the following toxicity pattern: MN > KN > MNn. On the contrary, NP and NPn did not show any harmful effects on the animals. Instead, NP and NPn, especially NPn, contributed to the survivorship of the animals. The animals were able to survive throughout the 21-day period of bioassays, and when the particle concentration reached 600 mg L −1 , they produced many neonates without any addition of food. This experimental results also indicated that the nanoscale particles were less toxic than the common-scale ones, both for MN and NP. Moreover, the results of the 21-day period of bioassays indicated that when the organisms were exposed to particles of different size scales, they showed different selection patterns for allocating resources. This may be due to the generation of different assimilation and digestion patterns.
研究领域:
生态毒理学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jianqiao Xu,Junyan Wei,Ruixue Guo,Shengnan Zhang,Xiaolei Teng,Zunyao Wang,Ruijuan Qu
Decachlorobiphenyl (PCB-209) can be widely detected in suspended particles and sediments due to its large hydrophobicity, and some of its transformation products may potentially threaten organisms through the food chain. Here we investigate the photochemical transformation of PCB-209 on suspended particles from the Yellow River. It was found that the suspended particles had an obvious shielding effect to largely inhibit the photodegradation of PCB-209. Meanwhile, the presence of inorganic ions (e.g. Mg 2+ and NO 3 - ) and organic matters (e.g. humic acid, HA) in the Yellow River water inhibited the reaction. The main transformation products of PCB-209 were lower-chlorinated and hydroxylated polychlorinated biphenyls (OH-PCBs), and small amounts of pentachlorophenol (PCP) and polychlorinated dibenzofurans (PCDFs) were also observed. The mechanisms of PCP formation by double •OH attacking carbon bridge and PCDFs formation by elimination reaction of ionic state OH-PCBs were proposed using theoretical calculations, which provided some new insights into the inter-transformations between persistent organic pollutants. In combination with VEGA and EPI Suite software, some intermediates such as PCDFs were more toxic to organisms than PCB-209. This study deepens the understanding of the transformation behavior of PCB-209 on suspended particles under sunlight.
研究领域:
环境科学
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毒理学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Junyan Wei,Jianqiao Xu,Xinyuan Wei,Dongmei Zhou,Zhongbo Wei,Xiaosheng Tang,Qing Zheng,Zunyao Wang,Ruijuan Qu
Microplastics are widespread in aquatic environments and, due to their small size and similar density to water, often coexist with suspended particulate matter (SPM). Both microplastics and SPM act as carriers, playing key roles in the migration and transformation of organic contaminants. However, most studies have focused on isolated systems, necessitating an investigation into how co-existing microplastics affect the phototransformation behavior of hydrophobic pollutants on carrier surfaces. In this study, a model system was constructed with the most commonly detected polyethylene (PE) microplastics, dichlorodiphenyltrichloroethane (o,p’-DDT), and Yangtze River SPM. The results showed that the introduction of PE into the SPM system notably accelerated the photodegradation of o,p’-DDT, with a synergistic promotion between PE and SPM. Utilizing chemical probes, quenchers, and electrochemical experiments, we found that PE facilitated the electron transfer in SPM, thereby enhancing the generation of reactive oxygen species (ROS) and ultimately, leading to the synergistic effect. By combining liquid chromatography-mass spectrometry and gas chromatography-mass spectrometry, we identified 17 intermediates and proposed three main transformation pathways: elimination, hydroxylation, and dechlorination. The potential mechanisms by which ROS induced these reaction pathways were further validated by density functional theory calculations. Moreover, PE formed interaction products with o,p’-DDT. Initial environmental risk assessment using VEGA and EPI Suite software indicated the products became less toxic, but were more likely to remain in water. This study deepened the understanding of the photochemical effects of microplastics and provided new insights into the environmental fate and risk of organic pollutants.
研究领域:
环境科学
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污染生态学
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化学
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产品关联
DOI
高影响因子
MARINE POLLUTION BULLETIN
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2024
·
IF 5.3
Jianxin Fan,Jiaxin Yang,Fulong Cheng,Shikuo Zhang,Jiaoxia Sun
The extensive use of antibiotics has led to significant antibiotic pollution in water bodies, and suspended particulate matter (SPM) is known to be a key carrier of antibiotics in rivers. In this work, the adsorption characteristics of sulfamethoxazole (SMX) on SPM was investigated through batch adsorption and annular flume experiments, and the MIKE 21 model was employed to simulate the migration of SMX and SPM. Results revealed that most SMX adsorption occurred rapidly within 20 min, and 80 % of the equilibrium adsorption capacity was reached. Multilayer adsorption was confirmed by Freundlich model, and adsorption process was found to be spontaneous, endothermic, disordered, and the equilibrium adsorption amounts of SMX on SPM increased with salinity and organic matter increase. SMX desorption from SPM occurred upon the sudden changes of hydrodynamic states, nearly reaching the one-fifth of the SMX equilibrium adsorption amounts within 30 min and the re-adsorption of SMX on SPM would occur with water remained stationary or the re-disturbance time prolonged. The dynamic adsorption process of SMX related with the physicochemical property changes of SPM, which was contributed to the hydrogen bonds, π–π interactions, surface complexation, significantly influenced by the pore filling at the macropore and mesopore scales. The MIKE 21 simulations confirmed hydrodynamic states as the primary factors affecting the migration of SMX and SPM. SMX concentrations in the water would decrease in the presence of SPM, leading to the slower downstream migration of SMX.
研究领域:
环境科学
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生态学
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产品关联
DOI
PubMed
高影响因子
MEASUREMENT
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2024
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IF 5.2
Yanyan Wang,Kaikai Zhang,Shengzhe Shi,Qingqing Wang,Chun Wang,Sheng Liu
To better utilize the spectral features of near-infrared and visible light and address issues in traditional suspension particle size detection, such as long measurement cycles, high costs, and complex operation, we propose a new method that combines multispectral sensor characterization technology with machine learning algorithms for rapid particle size measurement. By integrating a lab-designed light source driving circuit and spectral data acquisition device, we obtained 15 spectral data points for visible light, near-infrared, and red–blue–green (RGB) values to build a prediction model. The near-infrared-based model obtained a coefficient of determination (R 2 ) of 0.9130, whereas models combining RGB-near-infrared and visible-near-infrared features performed best, with R 2 values of 0.9670 and 0.9845. These models improved performance by 5.91% and 7.83%, effectively overcoming the limitations of single spectral features in different suspensions. This combination of visible and near-infrared light with machine learning proves effective for detecting average particle size in suspensions.
研究领域:
光学检测
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机器学习应用
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jiayu Zhang,Zhicheng Xing,Jianqiao Xu,Junyan Wei,Xiaolei Teng,Xinyuan Wei,Moustafa M.G. Fouda,Ruijuan Qu
Octachlorodibenzo-p-dioxin (OCDD) is widely present in suspended particles and sediments, and some of its transformation products may pose potential threats to the environment and human health. In this work, the photodegradation of OCDD on suspended particles from the Pearl River was systematically investigated by conducting water quality parameter experiments, mass spectrometry analysis, theoretical calculations and toxicity prediction. The experimental results showed that neutral conditions were favorable for OCDD photodegradation, and the presence of K + and Mg 2+ significantly promoted the reaction rate. The photodegradation process was driven by reactive oxygen species (ROS) such as hydroxyl radicals (·OH), singlet oxygen ( 1 O 2 ), and superoxide anions (·O 2 - ), primarily generated from suspended particles, with ·O 2 - being the predominant species. A variety of degradation products, including hydroxylated, dechlorinated, and ether bond-cleaved products, were identified by GC-MS and LC-HRMS, from which the reaction pathways were proposed and corroborated by theoretical calculations. Toxicity assessments indicated that bioaccumulation potential and mutagenicity of OCDD degradation products were generally reduced, yet developmental toxicity remained. This study deepens our understanding on the phototransformation mechanisms of OCDD on suspended particles and offers insights into the natural photochemical behavior of hydrophobic compounds.
研究领域:
环境科学
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生态毒理学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yulun Nie,Xiaofei Sun,Miao Wang,Xike Tian,Chao Yang,Chu Dai
UV-H 2 O 2 is the most widely used oxidizing system with established effectiveness and a high level of technical development for practical application. However, little attention was paid on the effect of suspended particles in natural water on organic contaminants removal via UV-H 2 O 2 technique. In this study, this effect of suspended particles to enhance the contaminant degradation was explored using silica/alumina-based oxides (MCM-41 and Al@MCM-41) as the representative. The results showed that MCM-41 had no effect on OFX degradation compared with UV-H 2 O 2 . While the degradation efficiency and reaction rate were greatly enhanced at a pH range of 3.0–9.0 especially at acidic pH values (3.0–5.0) in the presence of Al@MCM-41. The probe experiments proved that OFX adsorption followed by surface reaction process played an important role to enhance the performance of UV-H 2 O 2 . Based on the characterization results, the positive effect of suspended particles was not related to their surface area and pore size distribution, but dependent on the chemical composition and surface acid-base property. The suspended particles can provide an active surface composed of acid and base sites. The base site can create a local basic micro-environment by producing more • OH et al. While the dissociated acid sites in Al@MCM-41 with a negative charged surface favor OFX adsorption and then reaction with produced ROS . Our findings suggest that the enhanced performance of UVA-H 2 O 2 induced by suspended particles should be concerned.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Xiaolei Teng,Mengqiang He,Jianqiao Xu,Xiaosheng Tang,Qing Zheng,Zunyao Wang,Ruijuan Qu
Microplastics (MPs) and suspended particulate matter (SPM) are widely present in the aquatic environment, serving as carriers for various pollutants. Understanding the phototransformation behavior of hydrophobic organic pollutants in the presence of coexisting microplastics and SPM is crucial for assessing their environmental fate and potential impacts. In this study, we investigated the photochemical transformation behavior of octachlorodibenzo-p-dioxin (OCDF) in water under simulated solar irradiation, using polypropylene (PP) microplastics and SPM collected from the Pearl River. The results showed that the degradation rate of OCDF increased with the increase of PP content in the system. Experiments using EPR and probe molecules, as well as quenching experiments of reactive species, demonstrated that the presence of PP significantly elevated the concentration of reactive oxygen species (ROS) in the system. Through product analysis, we identified the main degradation pathways of OCDF to involve carbon-oxygen bond breaking, dechlorination and substitution reactions. These pathways were further rationalized and verified through theoretical calculations. In addition, we calculated the reaction energy barriers of OCDF attacked by ROS on the surface of particulate matter. Compared with SPM, the reaction energy barrier for OCDF reacting with •O 2 − on the PP surface was significantly reduced, suggesting that PP can enhance the photochemical transformation of OCDF by facilitating the reactivity of ROS. This study provides new insights into the photochemical transformation of hydrophobic organic pollutants mediated by microplastics in real aqueous environments, highlighting the role of MPs in altering the fate and behavior of persistent organic pollutants.
研究领域:
环境科学
·
污染生态学
✓ 已验证
DOI
PubMed
高影响因子
Environmental Chemistry and Ecotoxicology
·
2025
·
IF 8.2
Chong Chen,Huadong Yi,Shaopeng Xu,Yutong Zhang,Qihui Zhao,Ruolan Jia,Chengcheng Bu,Xian Qin,Sheng Bi,Limin Ma,Guifeng Li,Kenneth Mei Yee Leung,Yuefei Ruan
National Aquatic Germplasm Resources Reserves (NAGRRs) are pivotal protected areas in delivering ecological and socio-economic advantages. This study focuses on three NAGRRs in the South China Sea, meticulously examining the pollution levels of 31 common endocrine-disrupting chemicals (EDCs) within these protected areas and their surrounding coastal areas. The highest cumulative concentrations in the dissolved phase, suspended particulate matter (SPM) phase, and surface sediment were recorded at 280.59 ng/L in the dry season, 192.89 ng/L in the wet season, and 411.89 ng/g dry weight in the dry season, respectively. The log K D − SED (2.17−5.49 in the wet season and 2.51−5.50 in the dry season) were relatively lower than log K D − SPM (3.21−6.09 during the wet season and 3.79−5.75 during the dry season), suggesting a higher likelihood of EDC distribution to the SPM than surface sediment. The sum of five estradiol equivalent concentrations in the waters of the coastal and protected areas significantly surpassed the threshold for endocrine-disrupting activity, suggesting that the targeted estrogens in these regions may potentially disrupt the endocrine systems of aquatic organisms. Norgestrel, 17 α -ethinylestradiol, 4- tert -octylphenol, bisphenol A, bisphenol B, and bisphenol F were pinpointed as pollutants necessitating urgent concern due to their ecological risks and detection frequencies. These research findings provided valuable insights into the effective management and remediation of emerging pollutants within NAGRRs, thereby contributing to strengthening their protection and biodiversity conservation.
研究领域:
环境科学
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生态毒理学
·
海洋污染研究
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内分泌干扰
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水生生态学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Mengqiang He,Xiaolei Teng,Junyan Wei,Xiaoyu Li,Zunyao Wang
o,p’-dichlorodiphenyltrichloroethane (2,4′-DDT) is a typical persistent organic pollutant (POP) characterized by environmental persistence and acute toxicity. Its pronounced hydrophobicity drives preferential adsorption onto suspended particulate matter (SPM) in aquatic systems. This study systematically investigated the photochemical transformation mechanism of 2,4′-DDT in the Pearl River SPM-water system. Environmental factor analysis revealed negligible effects from pH and cations on 2,4′-DDT photodegradation, while NO 3 − and HCO 3 − inhibited degradation via competitive UV absorption and reactive species quenching. Reaction mechanisms were probed through H 2 O 2 -enhanced hydrophilic reactive oxygen species (ROS) generation, revealing dual photosensitizing and ROS-quenching roles of dissolved organic matter (DOM) in SPM. Hydrophobicity-dependent degradation patterns were revealed through quenching experiments and comparative POPs studies, demonstrating that hydrophilic-region ROS (particularly •OH) contributed dominantly to 2,4′-DDT degradation compared to hydrophobic-region ROS. The LC-MS and GC-MS analyses identified three transformation pathways: dechlorination, elimination, and hydroxylation. Theoretical calculations confirmed C-Cl bond cleavage and elimination feasibility, with •OH attacking benzene-ring carbons at minimal energies, explaining the formation of hydroxylated products. Notably, toxicity assessments revealed enhanced hazards of dechlorination and elimination photoproducts to humans and aquatic organisms than the parent compound.
研究领域:
环境化学
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光化学
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污染科学
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生态毒理学
·
水环境研究
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）