Environmental Science-Nano
·
2019
·Vol. 6
·期 12
·3712-3722
·
IF 7.704
Yuanyuan Ding,Xue Bai,Zhengfang Ye,Dongqing Gong,Jiajing Cao,Zulin Hua
The environmental transformations of silver nanoparticles (AgNPs) are correlated with their behaviors and ecological risks. Humic acid (HA) is ubiquitous in natural water environments. However, the influence of HA on the environmental behavior, bioavailability, and toxicity of AgNPs is little known. This study investigated the processes of AgNP bioaccumulation in and toxicity to Lemna minor in an aquatic environment. AgNP effects were assessed in the presence of HA, which has been shown to interact with AgNP and modify its behavior and toxicity to organisms. Results showed that AgNP dissolution declined with the addition of HA. Carboxylate groups and C–O and C–O–C bonds were found to be involved in the HA and AgNP interaction, while XPS results suggested that HA caused Ag+ to be reduced to Ag(0). The addition of HA inhibited the absorption and accumulation of Ag in Lemna minor roots and leaves. When exposed to AgNP treatments alone, the plant morphology and ultrastructure were damaged by root atrophy and a reduction in vessel number and cross-sectional areas (CSAs) was observed. However, the addition of HA mitigated AgNP toxicity, resulting in no significant difference in the chlorophyll biomass and concentration between the AgNP–HA and unexposed treatment groups. The addition of HA was found to inhibit the generation of ROS and the depolarization of mitochondrial membrane potential (ΔΨm) caused by AgNPs in root cells. Overall, these results establish the mechanism of the effect of HA on AgNP behavior and highlight the influence of HA on the uptake and toxicity of AgNPs to Lemna minor.
研究领域:
环境科学
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植物学
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毒理学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Xuefei Wu,Wei Jia,Zhipeng Fang,Hualong Sun,Gang Wang,Li Liu,Mengqi Zheng,Guowei Chen
Cyanobacterial blooms are expanding world-wide in freshwater and marine environments, and can cause serious ecological and environmental issues , which also contribute to the spread of antibiotic resistance genes (ARGs). However, the mechanistic understanding of cyanobacteria-mediated resistance dynamics is not fully elucidated yet. We selected Microcystis aeruginosa as a model cyanobacteria to illustrate how cyanobacteria mediate the evolution and transfer processes of bacterial antibiotic resistance . The results show that the presence of cyanobacteria significantly decreased the abundance of antibiotic resistant bacteria (ARB) and antibiotic resistant genes (ARGs) by 3%–99% and 2%–18%, respectively. In addition, it clearly altered bacterial community structure, with the dominant genera evolving from Acinetobacter (27%) and Enterobacter (42%) to Porphyrobacter (59%). The abundance of ARGs positively correlated with Proteobacteria and Firmicutes , rather than Cyanobacteria, and Bacteroidetes . In the presence of cyanobacteria, the transfer events of bacterial resistance genes via conjugation were found to decrease by 10%–89% (p < 0.05). Surprisingly, we found an extradentary high transfer frequency (about 0.1) for the ARGs via plasmid conjugation from the bacteria into M. aeruginosa population. It confirmed the role of cyanobacterial population as the competent hosts to facilitate ARGs spreading. Our findings provide valuable information on the risk evaluation of ARGs caused by cyanobacterial blooms in aquatic environments , key for the protection and assessment of aquatic environmental quality.
研究领域:
环境科学
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微生物学
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水生生态学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
Environmental Science and Ecotechnology
·
2023
·
IF 12.6
Si-Qi Zhang,Ping Li,Shu-Wen He,Shao-Ying Xing,Zhi-Han Cao,Xue-Li Zhao,Cuici Sun,Zhi-Hua Li
Microplastics (MPs), an emerging group of pollutants, not only have direct toxic effects on aquatic organisms but also cause combined toxicity by absorbing other pollutants. Triphenyltin (TPT), one of the most widely used organotin compounds, has adverse effects on aquatic organisms. However, little is known about the combined toxicity of MPs and TPT to aquatic organisms. To investigate the individual and combined toxicity of MPs and TPT, we selected the common carp ( Cyprinus carpio ) for a 42-day exposure experiment. Based on the environmental concentrations in a heavily polluted area, the experimental concentrations of MPs and TPT were set at 0.5 mg L −1 and 1 μg L −1 , respectively. The effects of MPs combined with TPT on the carp gut–brain axis were evaluated by detecting gut physiology and biochemical parameters, gut microbial 16S rRNA, and brain transcriptome sequencing. Our results suggest that a single TPT caused lipid metabolism disorder and a single MP induced immunosuppression in carp. When MPs were combined with TPT, the involvement of TPT amplified the immunotoxic effect induced by MPs. In this study, we also explored the gut–brain axis relationship of carp immunosuppression, providing new insights for assessing the combined toxicity of MPs and TPT. At the same time, our study provides a theoretical basis for evaluating the coexistence risk of MPs and TPT in the aquatic environment.
研究领域:
环境科学
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毒理学
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水生生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Che Han,Yujie Wang,Jintao Liu,Qiangyi Deng,Hongmei Zhang,Shuang Xu,Conglu Zhang
There is growing attention in the removal of microplastics (MPs) from aquatic environment because of their toxicity and difficulty in degradation. Magnetic Fe 3 O 4 is a potential material for MP removal, however, for fabrication of high-efficiency Fe 3 O 4 -based adsorbents, the alkaline synthesis conditions and weak affinity toward MPs must to be addressed. In this study, we developed magnetic α-Fe 2 O 3 /Fe 3 O 4 hybrid adsorbents (MFes) with engineered affinity sites via a facile one-pot synthesis method. During the material formation process, melamine acted as both a nitrogen source for creating N-modified polar adsorption sites and an inducer for formation of α-Fe 2 O 3 /Fe 3 O 4 phase interfaces. The α-Fe 2 O 3 /Fe 3 O 4 phase interfaces provided additional active sites, as evidenced by the enhanced microplastic adsorption performance. The MFe-1.6–100 achieved 92.3 % polystyrene removal at low adsorbent dosage 0.2 g L −1 and showed rapid adsorption kinetics within 25 min, which is superior to most reported values. After five cycles, the removal efficiency could still retain 90 %. Additionally, MFe-1.6–100 exhibited remarkable ion-tolerance for Cl - and NO 3 - . These performances suggest its potential applicability for MPs capture in aquatic environments.
研究领域:
环境科学
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材料科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 11
·1-17
·
IF 3
Yang Yangyang,Chen Qi,Wang Xiao,Hou Jun,Ren Lingxiao,Fan Xiulei,Liu Qiang,Liu Jiaqiang,Xu Ke,You Guoxiang
Microplastics (MPs) act as vectors for antibiotics in aquatic environments; however, their adsorption capacities, influenced by their color and the concentration of algal organic matter (AOM) in water, remain poorly understood. Herein, black tire wear particles (B-TWPs) and white polyethylene (W-PE) MPs were selected as model MPs. To accurately compare property differences between the two MP types in water environments, MPs particles subjected to ultraviolet aging (30 w) in ultrapure water, water with 5 mg/L AOM, and freshwater were analyzed. Further, changes in the structure, functional groups, and adsorption–desorption behaviors of tetracycline hydrochloride (TCH) on these MPs were studied. Results revealed that the hydrophilic properties of both the MPs developed with oxygen-containing functional groups, which enhanced their adsorption capacity after aging. AOM inhibited the aging extent of B-TWPs and W-PE MPs, with B-TWPs exhibiting a greater degree of aging than W-PE. These alterations substantially influenced the adsorption–desorption behavior of TCH, as confirmed by adsorption and desorption kinetic studies. The adsorption process of aged B-TWPs and W-PE MPs in the presence of AOM was best described by a second-order kinetic model (R 2 > 0.97). The isothermal adsorption results confirmed that the Freundlich model better described the adsorption of antibiotics on the MPs with and without AOM present (R 2 > 0.98). This study is the first to underscore the critical role of AOM in the aging of MPs with different colors. AOM modifies the adsorption and desorption behaviors of co-occurring antibiotics in the environment.
研究领域:
环境科学
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海洋污染
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材料科学
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水资源研究
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生态毒理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Lingjun Meng,Shaogui Yang,Mingbao Feng,Ruijuan Qu,Yong Li,Jiaoqin Liu,Zunyao Wang,Cheng Sun
Aquatic oligochaete Limnodrilus hoffmeisteri ( L. hoffmeisteri ) has been commonly used as a lethal and/or sub-lethal toxicological model organism in ecological risk assessments in contaminated water environments. In this study, experiments were conducted to investigate the potential toxic effects of copper (Cu(II)) with or without perfluorooctane sulfonate (PFOS) under different pH values (6.0, 7.0 and 8.0) on LC 50 , bioaccumulation, and oxidative stress biomarkers in L. hoffmeisteri after 3 and 7 days. The LC 50 values of Cu(II) decreased with the increasing pH and the addition of PFOS. After each exposure, increasing bioaccumulation of Cu(II) in L. hoffmeisteri was observed in the combined exposure treatments, whereas the bioaccumulation of PFOS decreased. Moreover, the activity of superoxide dismutase, the level of glutathione, and the content of malondialdehyde were significantly altered after these exposures, possibly indicating that the bioaccumulation of Cu(II) and PFOS caused adverse effects on antioxidant defenses of L. hoffmeisteri . The integrated biomarker response index, indicates that the combined effect was proposed as synergism, which is coincided with the results of toxic unit. Moreover, this work showed that aquatic environment may become more livable when water conditions changed from acidic to near-neutral or alkaline.
研究领域:
环境毒理学
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水生生态学
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生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Science and Technology
·
2025
·
IF 3.4
Shitu A.,Tadda M. A.,Li H.,Danhassan U. A.,Gouda M.,Zhou J.,Liu D.,Chen W.,Zhu S.
The recent development in mariculture production has led to the global need to find an eco-friendly treatment that could mitigate the detrimental effects of nitrogenous compounds on aquatic species, the environment, and public health. The potential application of corn straw biochar (BC) combined with nano-ferrous oxalate (FeC 2 O 4 ), integrated into a sponge (BC/FeC 2 O 4 /SB) as a cost-effective and sustainable novel carrier for the removal of nitrogenous compounds, was explored in this study. The modified carriers were filled into a moving bed bioreactor (MBBR) to treat simulated saline aquaculture wastewater for the first time. Scanning electron microscope (SEM) and Fourier-transform infrared (FTIR) spectroscopy analyses characterized the carrier biofilm morphology and functional group compositions. Findings showed that the modified carrier achieved the highest reduction percentages of 99.49 ± 0.29% for ammonium and 81.3 ± 2.1% for nitrate, with lower nitrite accumulation by day 136. The microbial sequencing analysis revealed that the coexistence of nitrogen removal and salt-tolerant microbes from the genera Aquimonas (25.15%), Woodsholea (20.44%), Hydrogenophaga (14.73%), Nitrosomonas (4.01%), Rhodococcus (2.70%), and Nitrospira (1.97%) resulted in the enhanced treatment performance observed in the modified BC/FeC 2 O 4 /SB carrier-filled MBBR as compared to the control MBBR. The data obtained in this study provide a comprehensive understanding of the role of modified BC/FeC 2 O 4 /SB carriers for the efficient treatment of saline RAS wastewater using MBBR.
研究领域:
环境科学
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生物技术
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水处理
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微生物学
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海洋科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Limei Xu,Zining Wang,Hanyu Zhang,Aoxue Sun,Gaoxiang Zhou,Ruixue Jiang,Tiantian Chen,Yong Wang,Xiaochen Li
So far, potential chronic risks of silver nanoparticles (AgNPs) on organisms remain largely unknown, especially molecular-level alterations at the environmentally relevant concentrations. In this study, Chlamydomonas reinhardtii ( C. reinhardtii ) is used as the model organism to investigate chronic toxic effects of 100 μg/L and 50 mg/L AgNPs for 120 d. Physiological studies showed that AgNPs attached on cell surface and internalized into algal cells, inducing the increase in cell permeability, the decline in cell size and granularity, the damage in photosynthetic systems, and the production of reactive oxygen species (ROS). The damage in photosynthetic systems was reflected in the decline in the photosynthetic activity ( F v / F m ), photosynthetic efficiency ( F v / F 0 ), and fluorescence intensities of Peridinin-Chlorophyll Protein Complex and Allophycocyanin. C. reinhardtii attempted to increase the absorption (ABS/RC), dissipation (Dl 0 /RC) and trapping (TR 0 /RC) of light energy for adapting AgNPs stress. In addition, the accumulation of glutathione (GSH), ascorbate (ASC), and the irreversible cell apoptosis was observed in 50 mg/L AgNPs group. Transcriptomics showed that most of genes involved in photosynthetic systems (e.g. photo-oxidation, light harvesting, and chlorophyll synthesis) were down regulated, providing evidence for chloroplast as the main target of AgNPs toxicity. The up-regulation of some genes, involved in ASC and aldarate metabolism, and GSH metabolism, showed self-adaptive capacity of C. reinhardtii to eliminate ROS under long-term exposure to AgNPs. Phagocytosis and endocytosis were the main pathways of the internalization of AgNPs. This study provided valuable data for potential chronic risks of nanoparticles in aquatic environment.
研究领域:
环境科学
·
毒理学
·
分子生物学
·
水生生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Mengjie Chang,Simeng Fan,Runqiu Lu,Fei Tao,Facui Yang,Qian Han,Jun Liu,Peng Yang
A sunscreen offers indispensable skin protection against UV damage and related skin diseases. However, due to the poor interfacial stability of sunscreen coatings on the skin, the synthetic ingredients in sunscreen creams easily fall off and enter aquatic environments, causing large ecological hazards and skin protection failure. Herein, we tackle this issue by introducing amyloid-like protein aggregates into a sunscreen to noticeably enhance the interfacial robustness of sunscreen coatings on the skin. The synthesis of such an agent to suppress sunscreen leakage can be achieved by manipulating the phase transition of bovine serum albumin (BSA) in a mild aqueous solution at room temperature. The resulting phase-transitioned BSA (PTB) aggregates effectively entrap the sunscreen ingredients to generate a uniform cream coating on the skin with robust amyloid-mediated interfacial adhesion stability. With continuous flushing in aquatic environments, such as salt water and seawater, this PTB-modified sunscreen (PTB sunscreen) coated on the skin maintains a retention ratio as high as >92%, which is 2–10 times higher than those of commercially available sunscreen products. The high retention ratio of the PTB sunscreen in aquatic environments demonstrates the great potential of amyloid-like protein aggregates in the development of leakage-free sunscreens with low ecosystem hazards and long-lasting UV protection in aquatic environments.
研究领域:
材料科学
·
生物技术
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AQUATIC TOXICOLOGY
·
2014
·
IF 3.513
Xiaoyan Zou,Junpeng Shi,Hongwu Zhang
Due to their bactericidal and photocatalytic characteristics, silver nanoparticles (Ag NPs) and titanium dioxide nanoparticles (TiO 2 NPs) are widely used in the fields of environment and physiology. Once these untreated nanoparticles are released into an aquatic environment and encounter one another, there is more uncertainty about their fate and ecotoxicological risks compared with the single nanoparticles. To expand our knowledge of the health and environmental impacts of nanoparticles, we investigated the possible risk of the co-existence of TiO 2 NPs and Ag NPs in an aquatic environment using ciliated protozoa ( Tetrahymena pyriformis ) as an aquatic animal model. In this study, silver ion (Ag + ) release and physicochemical properties, as well as their effect on oxidative stress biomarkers, were monitored. Continuous illumination (12,000 lx) led to the 20.0% decrease in Ag + release in comparison with dark conditions, while TiO 2 NPs and continuous illumination resulted in decreasing the Ag + concentration to 64.3% in contrast with Ag NPs-only suspensions. Toxicity tests indicated that different illumination modes exerted distinct effects of TiO 2 NPs on the toxicity of Ag NPs: no effects, antagonism and synergism in dark, natural light and continuous light, respectively. In the presence of 1.5 mg/L (18.8 μM) TiO 2 NPs, the toxicity of 1.5 mg/L (13.9 μM) Ag NPs was reduced by 28.7% and increased by 6.93% in natural light and 12,000 lx of continuous light, respectively. After culturing in 12,000 lx continuous light for 24 h, SOD activity of the light control surged to 1.96 times compared to the dark control ( P < 0.001). TiO 2 NPs induced a reduction of CAT activity by an average of (36.1 ± 1.7) % in the light. In the natural light reductions in the toxicity of Ag, NPs decrease Ag + concentrations via adsorption of Ag + onto TiO 2 NPs surfaces. The enhancement of Ag NPs toxicity can contribute to the formation of activated TiO 2 –Ag NPs complexes in continuous light. The existence of TiO 2 NPs in various illumination modes changed the surface chemistry of Ag NPs and then led to different toxicity effects. TiO 2 NPs reduce the environmental risks of Ag NPs in natural light, but in continuous light, TiO 2 NPs enhance the environmental risks of Ag NPs.
研究领域:
环境科学
·
纳米技术
·
毒理学
·
水生生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Dehua Zeng,Chengyu Chen,Ziqing Huang,Jingyi Gu,Zhiyu Zhang,Tingting Cai,Jiamin Peng,Weilin Huang,Zhi Dang,Chen Yang
Fate and transport of nanoplastics in aquatic environments are affected by their heteroaggregation with minerals in the presence of macromolecules. This study investigated the heteroaggregation of polystyrene nanoplastics (PSNPs) with goethite nanoparticles (GNPs) under the influence of macromolecules [humic acid (HA), bovine serum albumin (BSA), and DNA] and electrolytes. Under 1 mg C/L macromolecule, raising electrolyte concentration promoted heteroaggregation via charge screening, except that calcium bridging with HA also enhanced heteroaggregation at CaCl 2 concentration above 5 mM. At all NaCl concentrations and CaCl 2 concentration below 5 mM, 1 mg C/L macromolecules strongly retarded heteroaggregation, ranking BSA > DNA > HA. Raising macromolecule concentration strengthened such stabilization effect of all macromolecules in NaCl solution and that of DNA and BSA in CaCl 2 solution by enhancing steric hindrance. However, 0.1 mg C/L BSA slightly promoted heteroaggregation in CaCl 2 solution due to stronger electrostatic attraction than steric hindrance. In CaCl 2 solution, raising HA concentration strengthened its destabilization effect via calcium bridging. Macromolecules having more compact globular structure and higher molecular weight may exert greater steric hindrance to inhibit heteroaggregation more effectively. This study provides new insights on the effects of macromolecules and electrolytes on heteroaggregation between nanoplastics and iron minerals in aquatic environments.
研究领域:
环境科学
·
纳米技术
·
化学
·
水生生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Xiulei Fan,Rong Gan,Jiaqiang Liu,Ya Xie,Dezhi Xu,Yuan Xiang,Jikang Su,Zhen Teng,Jun Hou
Tire wear particles (TWP), as the significant proportion of microplastics (MPs), has adsorbed much attention due to its widespread presence in aquatic ecosystem . However, compared with traditional MPs, few studies have investigated the interaction between TWP and coexisting contaminants. The adsorption-desorption behavior of chlortetracycline (CTC) and amoxicillin (AMX) by original and aged TWP was studied, and polyethylene (PE) was studied for comparison. After aging, small holes and cracks were produced on the surfaces of the TWP and PE. Meanwhile, the specific surface areas ( S BET ) of TWP and PE increased, but the aged TWP had a larger S BET than the aged PE, which indicated that TWP was more likely to degrade than PE. The adsorption kinetics results showed that the adsorption of CTC and AMX by TWP and PE conformed to the pseudo-second-order model. The adsorption isotherm results showed that the Freundlich model could describe the adsorption isotherm data of TWP and PE. The adsorption capacity of antibiotics by TWP increased by 1.13–23.40 times, and by 1.08–14.24 times on PE, after aging. Desorption experiments showed that the desorption amount of antibiotics on TWP and PE in simulated gastric fluid was greater than that in ultrapure water. The desorption amount and rate of CTC and AMX from TWP were higher than those of PE, indicating that TWP might be more harmful to the aquatic environment and organisms. These findings indicated that, compared with PE, TWP might have stronger carrier effects on antibiotics, which might pose more serious potential risks to the aquatic environment and organisms, especially considering the effects of the aging process. This study would expand the research on environmental risk of MPs and contribute to providing new insights into the evaluation of tire material particles.
研究领域:
环境科学
·
化学工程
·
水生生态学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）