ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2021
·
IF 6.291
Zezheng Wang,Dongdong Fu,Liu Gao,Huaiyuan Qi,Yuanyuan Su,Licheng Peng
Environmental aging of ubiquitous microplastics (MP) occurs through the action of biotic and abiotic factors, and aged MP exhibit different physicochemical properties and environmental behavior from virgin MP. This study aimed to investigate the aged micro-sized polystyrene (mPS) and polyvinyl chloride (mPVC), and the heavy metals copper (Cu) and cadmium (Cd), and examine the effects of their combined toxicities on microalga Chlorella vulgaris . Results showed that the presence of MP inhibited cell growth as compared with the control, the inhibition rate ( I ) decreased as concentrations of MP rose and aged MP exhibited stronger inhibition of cells than did virgin MP. The largest I was achieved in each culture with the MP concentration of 0.01 g/L, in which aged mPS with the maximal of 36.84% ( I aged mPS ) followed by aged mPVC ( I aged mPVC = 30.03%), virgin mPS ( I virgin mPS = 29.10%) and virgin mPVC ( I virgin mPVC = 16.72%). Addition of the heavy metals Cu 2+ and Cd 2+ significantly inhibited cell growth, and toxicity increased with concentrations in a range of 0.5–2.0 mg/L; the maximum I values were 19.50% ( I Cu ) and 85.14% ( I Cd ), respectively. The combined toxicity of aged MP + Cu or aged MP + Cd was less than that of individual heavy metals. In particular, as compared with the maximal I Cd of 85.14% achieved by single Cd 2+ , the toxicity of Cd 2+ was greatly reduced when combined with aged mPS and mPVC, with the I value decreased to 27.55% ( I aged mPS ) and 32.51% ( I aged mPVC ), respectively. Both single and combined treatments caused cell damage to the microalga, accompanied by increased superoxide dismutase (SOD) and intracellular malonaldehyde (MDA) content.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Shunan Dong,Xiaoting Su,Liting Sheng,Qianhui Yu,Yulu Yu,Yuanyuan Sun,Jichun Wu,Bin Gao
For advancing current knowledge on the transport of microplastics (MPs) in the environment, this study used a real-time pore-scale visualization and quantitative system to examine the motions and mobility of fibrous and fragmental MPs under various surfactant (AEO, CTAC, and AES) and electrolyte conditions. The videos showed that fibrous MPs formed tangles through entanglement, which moved in an axial direction aligned with the flow streamline. Both fibrous and fragmental MPs showed suspended movement as well as surface movement (e.g., sliding, rolling, and saltating) in the porous media. Some deposited fibrous MPs showed flexible deformation due to shear flow. Compared to fragmental MPs, fibrous MPs showed lower mobility due to the tendency to deposit and clog the porous media. The mobility of fragmental MPs was enhanced in the presence of AEO but remained relatively unchanged with AES. In the presence of CTAC, the mobility of fragmental MPs was slightly inhibited under low ionic strength (IS) conditions but remarkably enhanced under high IS conditions. However, the mobility of fibrous MPs was largely unaffected by the surfactants. Both the numerical model and FDLVO calculations effectively described the transport and deposition of MPs in porous media.
研究领域:
环境科学
·
污染生态学
·
土壤科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2023
·Vol. 15
·期 3
·445
·
IF 3.4
Rijin Jiang,Zhaochao Deng,Jingjing Li,Yi Xiao,Yongjiu Xu,Jing Wang,Tiejun Li,Chunfang Zhang
Microplastics in marine environments are becoming a hot topic since they can be transferred through the marine food web and may finally be consumed by humans. Here, we investigate the distribution characteristics of microplastics in marine organisms at different trophic levels through their digestive tracts (entire organisms for zooplankton and zoobenthos). A total of 124 fish and 22 crustaceans from 10 fish and 3 crustacean species, as well as a few zooplankton and zoobenthos, were captured from the Zhoushan fishing ground, i.e., China’s largest ocean fishing ground. The abundance of microplastics ranged from 0.74 ± 1.29 to 4.71 ± 2.19 items per sample in fish species and from 0.83 ± 1.07 to 1.00 ± 0.93 items per sample in crustacean species. Among the detected microplastics, fiber was the most dominant type (i.e., 67%), transparent microplastics were the most frequently detected (i.e., 49%), and the majority of the microplastics were identified as natural particles (cellulose). The abundance of microplastics was positively correlated with the trophic level (correlation coefficient = 0.717;p< 0.05). Our results show that microplastics are widespread in the marine organisms of the Zhoushan fishing ground, and they might accumulate in marine organisms at higher trophic levels of the marine food chain.Keywords:microplastics;Zhoushan fishing ground;marine organism;food chain;natural microplastics
研究领域:
生态学
·
环境科学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Si Liu,JinHui Huang,Wei Zhang,LiXiu Shi,KaiXin Yi,ChenYu Zhang,HaoLiang Pang,JiaoNi Li,SuZhou Li
In this study, the adsorption behavior of Pb(II) on natural-aged and virgin microplastics in different electrolyte solutions was investigated. The results demonstrated that natural-aged microplastics exhibited higher adsorption capacity for Pb(II) compared to virgin ones, and the addition of CaCl 2 strongly inhibited the adsorption amount of Pb(II). The adsorption kinetics of Pb(II) adsorption were better fitted by the pseudo-second order model and Elovich equation, and were slowed down greatly at higher ionic strength. The rate-limiting steps of adsorption process were dominated by intra-particle diffusion. The adsorption isotherm of Pb(II) onto microplastics affected by salt ions can be well described by Freundlich model, the greater adsorption efficiency of natural-aged microplastics proved that adsorption process was multilayer and heterogeneous. In addition, pH significantly influenced the adsorption of Pb(II) due to the changes electrostatic interactions. The effect of fulvic acid in the electrolyte solutions was also revealed and attributed to the complexation with Na + and Ca 2+ . Furthermore, the higher pH and ionic strength in different environmental water dramatically decreased adsorption capacity onto microplastics. Finally, it’s confirmed that the adsorption mechanisms affected by salt ions mainly involve electrostatic interaction, surface complexation, and ionic exchange. These findings indicate that salt ions exert an important influence on the adsorption of heavy metals for MPs, which should be further concerned.
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
高影响因子
Journal of Hazardous Materials Advances
·
2023
·
IF 0
Jiaoxia Sun,Hong Xiang,Xueting Jiang,Xi Wang,Xue Luo,Jiang Fu,Jianxin Fan
Perfluoroalkyl substances (PFAS) and novel PFAS are continuously detected in soil environments and have attracted increasing attention. The presence of microplastics (MP) in soil systems is of increasing concern worldwide. However, the effects of MP on PFAS adsorption by soil systems remain largely unexplored. In this study, we compared the adsorption behavior of four PFAS on polyamide microplastics (PAMP), polyamide microplastic - soil mixtures (PAMP+soil), and soil to investigate the effects of MP on the adsorption of PFAS in soil. The results show that the four PFAS Perfluorooctanoic acid (PFOA), 6:2 fluorotelomer sulfonic acid (6:2FTSA), Perfluorohexanesulfonate (PFHxS) and Perfluorinated (2-methyl-3-oxohexanoic acid) (GenX) present different adsorption behaviors onto PAMP, PAMP+soil and soil due to their different physicochemical properties. However, similar laws are founded that the adsorption capacity of PAMP, with respect to the four PFAS, is stronger than that of PAMP+soil (20–56 times), followed by that of soil (72–122 times). PAMP amends into soil greatly inhibits the adsorption capacity of PAMP because their surfaces are covered with soil particles or biofilms. The inhibition rate decreases with increasing PAMP dosage. However, the addition of PAMP to soil significantly enhances the adsorption of PFAS compared with that of soil alone. This enhancement indicates that the input of MP into the soil might reduce the mobility of PFAS by improving the adsorption capacity of the soil. Furthermore, the co-culture time of PAMP and soil mixture has a slight impact on adsorption, suggesting that the effect of MP on soil adsorption of PFAS is almost stable. The findings of this study contribute to the understanding of the effects of PAMP in soil on the environmental behavior of PFAS and provide a valuable reference for evaluating the potential risk posed by the co-existence of MP and organic contaminants in soil ecosystems.
研究领域:
环境科学
·
污染生态学
✓ 已验证
DOI
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yu Liu,Wen-Yan Jiang,Yuying Liao,Ruikun Sun,Jiale Hu,Zifan Lu,Min Chang,Jie Yang,Zhenqing Dai,Chunxia Zhou,Pengzhi Hong,Zhong-Ji Qian,Shengli Sun,Lei Ren,Yan-Qiu Liang,Yueqin Zhang,Chengyong Li
In the field of microplastics research, more accurate standardised methods and analytical techniques still need to be explored. In this study, a new method for the microplastics quantitatively and qualitatively analysis by two-phase (ethyl acetate-water) system combined with confocal Raman spectroscopy was developed. Microplastics can be separated from false-positive microplastics in beach sand and marine sediment , attributing to the hydrophobic-lipophilic interaction (HLI) of the two-phase system. Results show that the recovery rates of complex environment microplastics (polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyamide 66 (PA 66), polycarbonate (PC) and polyethylene (PE)) are higher than 92.98%. Moreover, the new technique can also be used to detect hydrophobic and lipophilic antibiotics, such as sulfamethoxazole (SMX), erythromycin (EM), madimycin (MD), and josamycin (JOS), which adsorbed on microplastics and are extracted based on the dissolving-precipitating mechanism. This innovative research strategy provides a new scope for further detection of marine environment microplastics and toxic compounds adsorbed on its surface.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2024
·Vol. 96
·期 7
·e11080
·
IF 2.5
Zigong Ning,Shuang Zhou,Ying Yang,Pengxiang Li,Zilong Zhao,Wei Zhang,Lu Lu,Nanqi Ren
The presence of perfluoroalkyl substances (PFAS) in the environment poses a significant threat to ecological safety and environmental health. Widespread microplastics (MPs) have been recognized as vectors for emerging contaminants due to human activities. However, the adsorption behaviors of PFAS on MPs, especially on aged MPs, have not been extensively investigated. This study aimed to investigate the adsorption behaviors of perfluorooctanoic acid (PFOA) on aged MPs (polystyrene, polyethylene, and polyethylene terephthalate) treated with UV irradiation and persulfate oxidation under salinity and dissolve organic matter (DOM) condition. Carbonyl index values of MPs increased after the aged treatment, indicating the production of oxygen-containing groups. The PFOA adsorption on aged MPs was impacted by the co-existence of Na + ions and DOM. As PFOA adsorption onto aged MPs was mainly controlled by hydrophobic interaction, the electrostatic interaction also made a contribution, but there was no significant change in PFOA adsorption behavior between the pristine and aged MPs. While these findings provide insight into PFAS adsorption on aged MPs, further research is necessary to account for the complexity of the real environment. Practitioner Points Adsorption behaviors of perfluorooctanoic acid (PFOA) on aged microplastics were investigated. Hydrophobic interaction mainly controlled PFOA adsorption on aged microplastics (MPs). Co-existence dissolve organic matter and salinity influenced PFOA adsorption behaviors on aged MPs.
研究领域:
环境科学
·
污染生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MARINE POLLUTION BULLETIN
·
2024
·
IF 5.3
Xu Gao,Junling Chen,Kefu Yu,Yinyao Bu,Limei Wang,Xiaopeng Yu
Microplastics, a new type of pollutants found in coral reefs, have attracted increasing attention. However, most of the current research focuses on the scleractinian corals and few reports on Octocorallia. To reveal the impact of microplastic exposure on Octocorallia, we analyzed the transcriptional response of the coral hosts Junceella squamata along with changes to the diversity and community structure of its symbiotic bacteria following exposure to polystyrene microplastics. These results suggest that the microplastics have adverse impacts on nutrient metabolism and absorption in J. squamata . The symbiotic bacteria of J. squamata exhibited a clear response after exposure to microplastics, which may also reflect an adaptation mechanism of corals, and help to maintain the physiological function of coral symbiotic function under the exposure of microplastics. This study has revealed the impact of microplastic exposure on J. squamata , providing new insights for coral protection against the background of increased microplastics pollution.
研究领域:
海洋生物学
·
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Fei Miao,Yanfeng Liu,Mingming Gao,Xin Yu,Pengwei Xiao,Mei Wang,Shuguang Wang,Xinhua Wang
Nowadays, microplastic pollution has been brought into focus for its hazards to aquatic life. However, researches on the electrocatalytic treatment for efficient degradation of microplastics are still insufficient. Herein, an electro-Fenton like (EF-like) technology based on TiO 2 /graphite (TiO 2 /C) cathode was put forward to degrade polyvinyl chloride (PVC), a typical microplastic in water. It exhibited a remarkable performance on PVC degradation via cathodic reduction dechlorination and hydroxyl radical (O H) oxidation simultaneously. Besides, the effects of reaction temperature and initial PVC concentration were investigated. Under optimal conditions, the dechlorination efficiency of PVC reached 75 % after potentiostatic electrolysis at -0.7 V vs. Ag/AgCl for 6 h. The intermediate products were explored during the degradation of PVC microplastics. The surface morphologies and molecular weight of PVC changed accordingly. Based on these results, a possible degradation process for PVC was proposed. This work demonstrated that such a heterogeneous EF-like technology using TiO 2 /C cathode was hopefully to provide an eco-friendly method for microplastic wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Xu Zhang,Lixingzi Wu,Xinle Han,Yuzhi Shi,Jiwen Huang,Botao Ding,Yanhao Zhang,Zhibin Zhang,Yanfeng Shi,Fulin Li
Both perfluorooctanoic acid (PFOA) and polystyrene microplastics (PS-MPs) are emerging contaminants commonly found in aqueous environments. In co-contaminated areas, MPs may act as carriers for PFOA, complicating transport dynamics. However, information on their cotransport in porous media is limited. This study investigates the transport behaviors of PFOA and PS-MPs in saturated quartz sand columns under varying ionic strength (IS), cation type, and pH. Using the DLVO interaction energy theory and a mathematical model, we analyzed their cotransport. The results demonstrated that PS-MPs inhibited PFOA transport due to hydrophobic adsorption, reducing PFOA mobility. However, at pH 5, PS-MPs facilitated PFOA transport through competitive adsorption on sand surfaces. Conversely, PFOA significantly accelerated PS-MPs transport, likely due to electrostatic repulsion and reduced PS-MPs size. The promoting effect of PFOA on PS-MPs was similar in NaCl and CaCl 2 solutions. It is noteworthy that under acidic conditions, the increased electrostatic attraction between PS-MPs and quartz sand leads to substantial adsorption of PS-MPs onto the quartz sand surface. Under these conditions, PFOA exerts almost no promoting effect on PS-MPs. This study showed that the coexistence of PS-MPs and PFOA would influence the mobility of each other in the saturated porous media. Overall, the findings from this work could greatly improve our understanding of cotransport behaviors and environmental risk of PS-MPs and PFOA.
研究领域:
环境科学
·
污染生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Jiaqi Zhang,Guanghua Lu,Min Wang,Peng Zhang,Keqiang Ding
The addition of active ingredients such as antibacterial agent and non-active ingredients such as plastic microspheres (MPs) in personal care products (PCPs) are the common pollutants in the aquatic environment, and their coexistence poses potential threat to the aquatic ecosystem. As a substitute for the traditional antibacterial ingredients triclosan and triclocarban, the usage of parachlormetaxylenol (PCMX) is on the rise and is widely used in PCPs. In this study, the adsorption and desorption behaviors of PCMX were investigated with two typical MPs, polyvinyl chloride (PVC) and polyethylene (PE), and the effects of different aging modes and molecular mechanisms were explored through batch experiments and density functional theory calculation. Both laboratory aging and field aging resulted in surface wrinkles of MPs, along with an increased proportion of oxygen-containing functional groups (C O, -OH). At the same aging time, the degree of laboratory aging was stronger than that of field aging, and the aging degree of PVC was greater that of PE. The aging process enhanced the adsorption capacity of MPs for PCMX. The equilibrium adsorption capacity of PVC increased from 3.713 mg/g (virgin) to 3.823 mg/g (field aging) and 3.969 mg/g (laboratory aging), while that of PE increased from 3.509 mg/g to 3.879 mg/g and 4.109 mg/g, respectively. Meanwhile, aging also resulted in an increase in the desorption capacity of PCMX from PVC and PE. Oxygen-containing functional groups in aged MPs could serve as adsorption sites for PCMX and improved the electrostatic adsorption capacity. Oxygen-containing groups generated on the surface of aged MPs formed hydrogen bonding with the phenolic hydroxyl groups of PCMX, which became the main driving force for adsorption. Our results reveal the potential impact and mechanism of aging on the adsorption of PCMX by MPs, which provides new insights for the interaction mechanism between environmental MPs and associated contaminants.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Hongjia Peng,Zuhong Lin,Denglong Lu,Bolun Yu,Haipu Li,Jingjing Yao
Microplastics (MPs) commonly coexist with heavy metals in the soil environment. MPs can influence the activity of heavy metals, and the specific mechanisms need to be further explored. Here, different contents of polystyrene (PS) MPs were added to soil to explore their effects on the adsorption and desorption characteristics of copper (Cu 2+ ) in soil. The adsorption process was mainly chemical adsorption and belonged to a spontaneous, endothermic reaction. The hydrophobicity of MPs slowed down the adsorption and desorption rates. The main adsorption mechanisms included complexation by oxygen-containing functional groups, ion exchange (accounting for 33.97–36.04 % of the total adsorption amounts), and electrostatic interactions. MPs lacked oxygen-containing functional groups and were predominantly engaged in ion exchange and electrostatic interactions. MPs diluted, blocked the soil, and covered the active sites of soil, which reduced adsorption (3.56–16.18 %) and increased desorption (0.90–2.07 %) of Cu 2+ in soil samples, thus increasing the activity and mobility of Cu 2+ . These findings provide new insights into the effects of MPs on the fate and risk of heavy metals in soil. Environmental implication The existing literature concerning the effects of microplastics on the adsorption of heavy metals in soil is insufficient. Our investigation unveiled that the main adsorption mechanisms of different soil samples included complexation by oxygen-containing functional groups, ion exchange (accounting for 33.97–36.04 % of the total adsorption amounts), and electrostatic interactions. MPs lacked oxygen-containing functional groups and were predominantly engaged in ion exchange and electrostatic interactions. MPs diluted, blocked the soil, and covered the active sites of soil, which reduced adsorption (3.56–16.18 %) and increased desorption (0.90–2.07 %) of Cu 2+ in soil samples, thus increasing the activity and mobility of Cu 2+ .
研究领域:
环境科学
·
土壤学
✓ 已验证
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）