PLoS One
·
2015
·Vol. 10
·期 7
·e0131450
·
IF 3.234
Hangjun Zhang,Xiaojun Jiang,Liping Lu,Wenfeng Xiao
Polychlorinated biphenyls (PCBs), a class of hazardous pollutants, are difficult to dissipate in the natural environment. In this study, a cyanobacterial strain Anabaena PD-1 showed good resistance against PCB congeners. Compared to a control group, chlorophyll a content decreased 3.7% and 11.7% when Anabaena PD-1 was exposed to 2 and 5 mg/L PCBs for 7 d. This cyanobacterial strain was capable of decomposing PCB congeners which was conclusively proved by determination of chloride ion concentrations in chlorine-free medium. After 7 d, the chloride ion concentrations in PCB-treated groups (1, 2, 5 mg/L) were 3.55, 3.05, and 2.25 mg/L, respectively. The genetic information of strain PD-1 was obtained through 16S rRNA sequencing analysis. The GenBank accession number of 16S rRNA of Anabaena PD-1 was KF201693.1. Phylogenetic tree analysis clearly indicated that Anabaena PD-1 belonged to the genus Anabaena . The degradation half-life of Aroclor 1254 by Anabaena PD-1 was 11.36 d; the total degradation rate for Aroclor 1254 was 84.4% after 25 d. Less chlorinated PCB congeners were more likely to be degraded by Anabaena PD-1 in comparison with highly chlorinated congeners. Meta - and para -chlorines in trichlorodiphenyls and tetrachlorobiphenyls were more susceptible to dechlorination than ortho -chlorines during the PCB-degradation process by Anabaena PD-1. Furthermore, Anabaena PD-1 can decompose dioxin-like PCBs. The percent biodegradation of 12 dioxin-like PCBs by strain PD-1 ranged from 37.4% to 68.4% after 25 days. Results above demonstrate that Anabaena PD-1 is a PCB-degrader with great potential for the in situ bioremediation of PCB-contaminated paddy soils.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
·
2020
·
IF 7.577
Fangjing Lin,Jianteng Sun,Na Liu,Lizhong Zhu
Polychlorinated biphenyls (PCBs) and their biotransformation products, hydroxylated (OH-PCBs) and methoxylated derivatives (MeO-PCBs), have been detected in the environment and biota, especially crops. However, to date, little information is available on the phytotoxicity and metabolic responses induced by these chemicals in crops. In this study, we exposed rice ( Oryza sative L.) seedlings to 2,3,4,5-tetrachlorobiphenyl (CB-61) and its hydroxylated (4′-OH-CB-61) and methoxylated derivatives (4′-MeO-CB-61) at 0, 10, 50, 100 and 500 μg/L, respectively. After exposure for 14 days, significantly growth inhibition and oxidative damage were observed, among which the toxicities of 4′-OH-CB-61 and 4′-MeO-CB-61 were greater than that of the parent PCBs. Metabolomics analysis indicated that exposure to the three chemicals induced different metabolic responses. 4′-MeO-CB-61 mainly affected the saccharide catabolism, including pyruvate metabolism, the TCA cycle, the transfer of acetyl groups into mitochondria and the Warburg effect, resulting in a greater energy consumption. Moreover, both CB-61 and 4′-OH-CB-61 promoted several amino acid metabolism and fatty acid biosynthesis, thereby alleviating the potential ROS damage. This study for the first time evaluates and reveals the phytotoxicity of OH-PCBs and MeO-PCBs at the metabolic level, which attempts to provide important information for accurately evaluating the environmental risks of PCBs from the perspective of metabolism.
研究领域:
环境科学
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植物生物学
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毒理学
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代谢组学
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Qihua Lin,Xinru Zhou,Shusheng Zhang,Junliang Gao,Mengqi Xie,Linqin Tao,Faqian Sun,Chaofeng Shen,Muhammad Zaffar Hashmi,Xiaomei Su
Most functional microorganisms cannot be cultivated due to entering a viable but non-culturable (VBNC) state, which limits the characterization and application of polychlorinated biphenyl (PCB)-degrading strains. Resuscitating VBNC bacteria could provide huge candidates for obtaining high-efficient PCB degraders. However, limited studies have focused on the ability of resuscitated strains for PCBs degradation. In the present study, whole-genome analysis of a resuscitated strain SPC0, and its performances in degradation of three prevalent PCB congeners (PCBs 18, 52 and 77) were investigated. The results indicate that the strain SPC0 belonged to the genus Streptococcus , possessed the degradation potential for aromatic xenobiotics . The SPC0 could effectively degrade PCBs 18 and 52, but exhibited lower degradation efficiency of PCB 77. Degradation of PCBs 18 and 52 could be fitted well by zero-order model, whereas the fittest model for PCB 77 degradation was pseudo second-order kinetics. The bph genes expression, chloride ions release and degradation metabolites identification, suggest that SPC0 possessed the capability of oxidative dehalogenation and mineralization of PCBs. Interestingly, SPC0 can degrade PCBs via the bph -encoded biphenyl pathway, and further mineralize metabolite dichlorobenzoate via protocatechuate pathway. This study is the first to show that a strain belonging to genus Streptococcus possessed PCB-degrading capability, which uncovered the powerful potential of resuscitated strains for bioremediation of PCB-contaminated sites.
研究领域:
环境微生物学
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生物修复
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基因组学
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生物降解
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DOI
PubMed
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2024
·
IF 2.8
Qin Wen,Shizong Wang,Jianlong Wang,Hai Chen,Yuedong Zhou
In this study, the degradation and mineralization of 2-chlorobiphenyl (2-PCB) by gamma irradiation were investigated in the presence of persulfate (PS), to examine the synergistic effect of radiation and persulfate oxidation. The results showed that the absorbed dose required for complete removal of 2-PCB decreased in the presence of PS. In addition, compared to a single irradiation system, the removal efficiency and mineralization of 2-PCB in deionized water , groundwater, and secondary effluent increased when irradiation combined with PS. 2-PCB at concentration of 4 mg L −1 to 8 mg L −1 could be efficiently degraded at a wide pH range (3.0–9.5) in irradiation-activated PS (irradiation/PS) system. The presence of 10 mM or 100 mM of Cl − , NO 3 − , CO 3 2− , and SO 4 2− in irradiation/PS system had no obvious influence on 2-PCB removal. 2-PCB was degraded under the combined action of sulfate radicals (SO 4 •− ) and hydroxyl radicals (·OH), in which ·OH contributed more. The irradiation/PS system is promising to treat PCB-containing wastewater.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Lili Pan,Jianteng Sun,X. Chris Le,Lizhong Zhu
Contamination of organic pollutants in the environment is usually accompanied by heavy metals. However, a little information on the influences of heavy metals on the uptake, translocation and transformation of organic pollutants in plants is available. In this study, ten-day hydroponic exposure was conducted to explore the influence of copper (Cu) on the bioaccumulation and biotransformation of polychlorinated biphenyls (PCBs) in intact young rice ( Oryza sativa L.). Low dose of Cu (≤100 μmol/L) increased the accumulation of CB-61 in rice plants, while excess concentrations of Cu (>100 μmol/L) inhibited uptake and translocation of CB-61. Effect of Cu on the uptake of CB-61 was attributed to the Cu-triggered damage to the roots of rice plants. The presence of a moderate dose of Cu (50 μmol/L) enhanced the formation of hydroxylated polychlorinated biphenyls (OH-PCBs) and methoxylated polychlorinated biphenyls (MeO-PCBs), whereas excess concentrations of Cu (250 μmol/L) inhibited the metabolism of CB-61. The effect of Cu on the interconversion between 4′-OH-CB-61 and 4′-MeO-CB-61 was also concentration dependent: the biotransformation was promoted by a moderate concentration of Cu but inhibited by excess concentrations of Cu. The activities of Cytochrome P450 (CYP450) and S-adenosyl- l -methionine (SAM)-dependent methyltransferase in the roots of rice plants exposed to Cu and CB-61 or its derivatives were consistent with the pattern and trend of the metabolites observed in rice roots. These results could provide valuable insights into the interactions and combined effects of PCBs and heavy metals in plants.
研究领域:
环境科学
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植物学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hailin Zheng,Demin Zhu,Chengyi Xiong,Xiquan Hu,Miao-Miao Chen,Shengfu Wang,Yao Xiao,Xiuhua Zhang
Structure defects of advanced two-dimensional (2D) transition metal dichalcogenides (TMDCs) have provided enormous opportunities for modified band structures and fascinating properties to facilitate the development of fundamental studies, among which intrinsic defects can be spontaneously introduced to 2D materials to expand the functional diversity. Except for unary intrinsic defects, structure–activity relationships of multiplex intrinsic defects and modulated properties still remain to be released for practical applications. Herein, binary intrinsic defects in exfoliated molybdenum disulfide (MoS 2 ), including sulfur monovacancies and oxygen substitution, were studied for revealing the sensing mechanism of 2,4,4′-trichlorobiphenyl (PCB28). They theoretically tended to form homosteric associated pairs and promote molecular anchoring synergistically. Appropriate molecular adsorption and efficient electron transfer enabled the excellent sensing performances for PCB28 including considerable linear region of 100 ng mL −1 ∼ 1 mg mL −1 and low detection limit of 7.96 ng mL −1 , which was also inspirable for the design of other small-molecule sensors.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Wei Lin,Ruifen Jiang,Yaxin Xiong,Jiayi Wu,Jianqiao Xu,Juan Zheng,Fang Zhu,Gangfeng Ouyang
It has been reported that nanoplastics (NP) could cause serious toxicity and accumulative effects on aquatic organisms as well as interact with organic pollutants and influence potential hazards when exposed to biota. The current study aimed to quantitatively investigate the combined acute toxic effect of polychlorinated biphenyls (PCBs) and nano-sized polystyrene (PS) plastic on aquatic organisms based on analyte speciation. First, the combined acute toxicity of PCB-18 and 100 nm PS to Daphnia magna ( D. magna ) in water was evaluated. Then, speciation analysis of the exposure system was conducted by measuring the sorption coefficients ( logK NP ) of PCBs to nano-sized PS (ranging from 5.28 to 6.56), which demonstrated the PS could substantially decrease the free concentrations of PCBs. The results showed that a low concentration of the PS could decrease the toxicity to D. magna ., which might be originated from the decreased free concentration of PCB-18. However, when the PS concentration was high enough, an opposite effect was observed because the PS dominated the lethality instead of PCB-18. The current study is helpful to clarify the PCB occurrence in ecosystems and provide an in-depth understanding of the eco-toxicological effects of nanoscale plastics.
研究领域:
环境科学
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生态毒理学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 28
·72966-72977
·
IF 5.8
Wang Zhongmiao,Yang Kun,Lin Daohui
Biochar releases colloidal particles into the environment during applications and aging which can become carriers of pollutants and influence on the environmental risk of pollutants due to the excellent adsorption and migration properties of biochar colloids (BCCs). The adsorption and desorption behaviors of BCCs can be different from their bulk ones due to the colloidal size, which merits specific studies. Herein, the adsorption and desorption of 2,4,4′-trichlorobiphenyl (PCB28) as a representative on BCCs released from bulk biochars prepared from bamboo chips at 300, 500, and 700 C and the effects of solution properties were specifically investigated. Results show that the adsorption was dominated by pore filling and π–π interaction, and thus, BCCs prepared at higher temperature with greater pore volume and aromaticity had higher adsorption of PCB28. Results show that the adsorption was dominated by pore filling and π–π interaction, and thus, BCCs prepared at higher temperature with greater pore volume and aromaticity had higher adsorption of PCB28. The saturation adsorption amounts of PCB28 on BCC300, BCC500, and BCC700 were 21.9, 40.3, and 62.4 mg/g, respectively. It is noteworthy that PCB28 possessed a significant desorption hysteresis from BCCs, with the hysteresis index (Ce = 80 μg/L) increased from 0.380 to 0.661 as the preparation temperature of BCCs rising from 300 to 700 ℃. High concentration of NaCl (100 mmol/L) was unfavorable for the adsorption and desorption. The presence of humic acid or fulvic acid (FA), especially the smaller FA, could inhibit the adsorption and desorption of PCB28 on BCCs due to micropore blocking. In seawater, groundwater, surface water, and soil solution samples, the PCB28 adsorption of BCCs was inhibited to varying degrees in comparison with that in deionized water, and the desorption was noticeably inhibited in the groundwater sample. These findings provide valuable information for the understanding of interactions between BCCs and organic contaminants in natural waters and for the environmental application of biochars as well. Graphical abstract
研究领域:
环境科学
·
污染生态学
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产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Zhongmiao Wang,Xintong Lin,Kun Yang,Daohui Lin
Despite the crucial role of photodegradation in the environmental transformation of organic pollutants, the photodegradation process of organic pollutants irreversibly absorbed on biochar colloids (BCCs) remains poorly understood. This study investigated the photodegradation processes and mechanisms of 2,4,4′-trichlorobiphenyl (PCB28) adsorbed on BCCs released from bulk biochars derived from bamboo chips at pyrolysis temperatures of 300, 500, and 700 °C. Results show that BCCs-adsorbed PCB28 could be degraded under simulated solar illumination (95–105 mW·cm −2 ) but at decreased photodegradation rates compared to the dissolved PCB28. The inhibition effect of BCCs on the PCB28 photodegradation increased with increasing pyrolysis temperature. After adsorptive binding to BCCs, the half-life of PCB28 (0.1 mg/L) was prolonged from 2.65 h for the dissolved PCB28 alone in deionized water to 7.48, 40.67, and 81.82 h in the presence of BCC300, BCC500, and BCC700 (5.0 mg/L), respectively. Mechanistically, the photodegradation of adsorbed pollutants was regulated by the photogenerated free radicals and surface functional groups of the low-temperature BCCs, as well as the defects and direct electron transfer capabilities of the high-temperature BCCs; PCB28 adsorbed on the low-temperature BCCs accepted electrons from persistent free radicals under light illumination, which led to PCB28 dechlorination, followed by ring-opening oxidation through hydroxyl radical attack, ultimately resulting in progressive mineralization; singlet oxygen caused preferential ring opening of adsorbed PCB28 on the high-temperature BCCs, preceding dechlorination. The photodegradation of BCCs-adsorbed PCB28 remained significant though more or less being inhibited under the effects of water pH, ionic strength, dissolved organic matters (humic acid and fulvic acid), and in natural water samples. These findings contribute to a better understanding of the structural properties of BCCs that impact phototransformation processes of adsorbed pollutants and facilitate an accurate assessment of the environmental risk associated with biochar application.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Binglu Deng,Xingqiu Zhou,Xingjian Yang,Zhi Dang,Guining Lu
ABSTRACT This study reports on the adsorption of polychlorinated biphenyls (PCBs) by powder activated carbon (PAC) in soil washing eluents containing tween-80 surfactant micelles. Factors influencing of adsorption were studied (i.e., time, adsorbents doses, molecular structure of different PCBs congeners, dynamic and thermodynamic models). The adsorption of PCBs on nano bamboo charcoal (NBC) was compared with those on PAC. Finally, the prospect for recycling soil eluents was explored. We found that the PAC and NBC were both effective in removal of 12 mg/L PCBs in soil washing eluents. The results of the adsorption kinetics showed that both materials have different adsorption rate controlling step, the particles diffusion became adsorption rate controlling step of NBC while particle diffusion and adsorption reaction like chemical bonding reactions co-control the adsorption rate of PAC. The adsorption of PCBs on PAC was probably chemisorption through interaction between aromatic rings and oxygen-containing functional groups while the adsorption on NBC was mainly physisorption by micropore filling. After the PAC treatment, the residual tween-80 in the eluents was 27.78% (total mass ratio). The addition of acetone to break micelles before adsorption could increase the recovery of tween-80 to 73.30% while PCBs removal rate could still reach 78.06%. Therefore, the surfactant solutions can be reused after adsorption. The studies provide valuable information on the adsorption of PCBs by PAC in soil washing eluents, which may improve the utilization and selection of PAC in the recovery of soil washing eluents.
研究领域:
环境科学
·
污染治理
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DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2010
·Vol. 86
·期 1
·38-42
·
IF 0.992
Yang Zhong-Zhi,Li Yong-Fang,Li Zhi-Chun,Gu Yu-Mei,Zhu Ya,Zhang Zhan-Jun
Five higher Chlorinated Benzenes (CBs), include Hexachlorobenzene (HCB), pentachlorobenzene (PeCB) and three isomers of tetrachlorobenzens, were analyzed in 20 outdoor dust samples collected from a fast developing city, Xinxiang. Only HCB was detected in all outdoor dust samples. The dominate part of the CBs residue in most samples was HCB and the mean HCB concentration (4.13 ng/g dry weight) in this study was in the range of global background soil HCB levels (ranging from 0.010 to 5.20 ng/g dry weight). The higher ratios of HCB/PeCB in the outdoor dust samples in the present study indicate that pesticide application may be an important source of HCB in China.
研究领域:
环境科学
·
毒理学
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DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2020
·
IF 5.278
Linli Hou,Yonghai Song,Fengxiang Lang,Zhenrong Wang,Li Wang
A luminescent Tb 3+ -pyromellitic acid (H 4 L = pyromellitic acid) coordination polymer (Tb-H 4 L CP, TbL 0.5 (H 2 L) 0.5 (H 2 O)·DMF) was prepared for multiresponsive fluorescence sensor. The Tb-H 4 L CP exhibits uniform nanospheres with average diameter of 220 ± 20 nm, good crystalline structure, and good dispersion in water. The Tb-H 4 L CP emitted the characteristic green fluorescence through antenna effect from H 4 L which was an excellent antenna molecule when excited at 270 nm and could be used to selectively determine Fe 3+ and polychlorinated benzenes based on fluorescence quenching effect. The coordination between Fe 3+ and carboxylic oxygen of Tb-H 4 L to damage the antenna effect and polychlorinated benzenes absorb the excitation light to result the inner-filter effect of fluorescence, which quenched the fluorescence of Tb-H 4 L CP. The linear range for Fe 3+ was 2.0–100 μM with a detection limit of 0.7 μM and for 1,3,5-trichlorobenzene was 0–0.44 × 10 3 ppm with a detection limit of 0.087 ppm. The Tb-H 4 L CP demonstrates excellent fluorescence sensing performances, indicating that it can be used as a multi-response sensor to effectively measure toxic and harmful substances.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
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