SCIENCE OF THE TOTAL ENVIRONMENT
·
2016
·
IF 3.976
Hai-Ming Zhao,Huan Du,Jing Lin,Xue-Bin Chen,Yan-Wen Li,Hui Li,Quan-Ying Cai,Ce-Hui Mo,Hua-Ming Qin,Ming-Hung Wong
A newly isolated strain Agromyces sp. MT-O could utilize various phthalates and efficiently degraded di-(2-ethylhexyl) phthalate (DEHP). Response surface methodology was successfully employed for the optimization of culture conditions including pH (7.2), temperature (29.6), and inoculum size (OD 600 of 0.2), resulting in almost complete degradation of DEHP (200 mg L − 1 ) within 7 days. At different initial concentrations (50–1000 mg L − 1 ), DEHP degradation curves were fitted well with the first-order kinetic model, and the half-life of DEHP degradation ranged from 0.83 to 2.92 days. Meanwhile, the substrate inhibition model was used to describe the special degradation rate with q max , K s , and K i of 0.6298 day − 1 , 86.78 mg L − 1 , and 714.3 mg L − 1 , respectively. The GC–MS analysis indicated that DEHP was degraded into mono-ethylhexyl phthalate and phthalate acid before its complete mineralization. Bioaugmentation of DEHP-contaminated soils with strain MT-O has greatly enhanced DEHP disappearance rate in soils, providing great potential for efficiently remediating DEHP-contaminated environment.
研究领域:
环境科学
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微生物学
·
生物技术
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Fei-fei Liu,Guang-zhou Liu,Zhi-lin Zhu,Su-chun Wang,Fei-fei Zhao
Microplastics have become a major concern in recent years as they can be recognized as the transport vectors for pollutants in environment. In this study, the sorption behavior of two phthalate esters (PAEs), including diethyl phthalate (DEP) and dibutyl phthalate (DBP), onto three types of microplastics (PVC: polyvinyl chloride, PE: polyethylene, and PS : polystyrene) was investigated. The sorption isotherms of both DEP and DBP on microplastics were highly linear, suggesting that the partition was the main sorption mechanism. The K d values of DBP were much higher than those of DEP, demonstrating that hydrophobic interaction governed the partition mechanism. Sorption of the two PAEs on the three microplastics followed the order of PS > PE > PVC , indicating that chemical properties of microplastics played an important roles in their sorption behaviors. Solution pH and natural organic matter had no significant impact on PAEs sorption by microplastics. However, the presence of NaCl and CaCl 2 enhanced the sorption of both DEP and DBP because of the salting-out effect. The findings of the present study may have significant implications for the fate and transport assessment of both PAEs and microplastics.
研究领域:
环境科学
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化学
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污染研究
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DOI
PubMed
高影响因子
TALANTA
·
2013
·
IF 3.498
Xi Luo,FeiFang Zhang,Shunli Ji,Bingcheng Yang,Xinmiao Liang
Graphene nanoplatelet (GN) as a solid-phase extraction (SPE) sorbent in combination with high performance liquid chromatography has been used for the determination of five phthalate esters (PAEs) in aqueous solution. The operation parameters affecting the extraction efficiency were optimized. Comparative studies showed that GN was superior to other common SPE sorbents in terms of recovery and adsorption capacity. Under optimization conditions, detection limits of 0.09–0.33 ng mL −1 were achieved for five PAEs and enrichment factors of 402–711 for the analytes were obtained. The proposed method was successfully applied for the determination of PAEs in tap water and drink samples with recoveries ranging from 87.7% to 100.9%.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2014
·
IF 4.331
Zhixing He,Chengzhen Niu,Zhenmei Lu
The bacterial strain DP-2, identified as Rhodococcus ruber , is able to effectively degrade di-n-butyl phthalate (DBP) and phenol. Degradation kinetics of DBP and phenol at different initial concentrations revealed DBP and phenol degradation to fit modified first-order models. The half-life of DBP degradation ranged from 15.81 to 27.75 h and phenol degradation from 14.52 to 45.52 h under the initial concentrations of 600–1200 mg/L. When strain DP-2 was cultured with a mixture of DBP (800 mg/L) and phenol (700 mg/L), DBP degradation rate was found to be only slightly influenced; however, phthalic acid (PA) accumulated, and phenol degradation was clearly inhibited during synchronous degradation. Transcriptional levels of degradation genes, phenol hydroxylase ( pheu ) and phthalate 3,4-dioxygenase ( pht ), decreased significantly more during synchronous degradation than during individual degradation. Quantitative estimation of individual or synchronous degradation kinetics is essential to manage mixed hazardous compounds through biodegradation in industrial waste disposal.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Huanxuan Li,Jinquan Wan,Yongwen Ma,Mingzhi Huang,Yan Wang,Yangmei Chen
Batch tests were conducted to investigate the effect of initial pH on the degradation of dibutyl phthalate (DBP), the formation and evolution of iron corrosion products, and the role of iron oxides on the further degradation of DBP in zero-valent iron (ZVI)–persulfate system. The study indicated that the half-lives for the oxidation of DBP by persulfate activated with ZVI were 30–176 min at pH 3.0–11.0. The constituents and the morphology of the iron corrosion coating along different initial pH and over reaction time were investigated with Raman spectroscopy , X-ray photoelectron spectroscopy and Scanning electron microscopy. The results illustrated that magnetite (Fe 3 O 4 ), wustite (FeO), hematite (α-Fe 2 O 3 ) and goethite (α-FeOOH) were identified as the corrosion products. In alkaline and neutral solutions, the inner layer of iron oxides was mainly composed of α-Fe 2 O 3 with some α-FeOOH while the outer layer mostly consisted of Fe 3 O 4 and α-FeOOH. Oppositely, the iron oxides formation in acidic solution mainly consisted of Fe 3 O 4 , α-FeOOH and a small amount of α-Fe 2 O 3 and FeO in the inner layer, the outer layer was mostly composed of α-Fe 2 O 3 and some α-FeOOH. These iron corrosion coatings exhibited an inhibitory effect on the degradation of DBP, which may be due to that the iron oxides hindered the electron transfer from ZVI core to the solid–liquid interface.
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
JOURNAL OF SEPARATION SCIENCE
·
2014
·Vol. 37
·期 13
·1679-1686
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IF 2.594
Jianzhi Sun,Hui He,Shuhui Liu
A simple method that consumes low organic solvent is proposed for the analysis of phthalic acid esters in Chinese white spirit using dispersive liquid–liquid microextraction coupled with sweeping-micellar electrokinetic chromatography. Tetrachloromethane and white-spirit-containing ethanol were used as the extraction and dispersing solvents, respectively. The electrophoresis separation buffer was composed of 5 mM β-cyclodextrin, 50 mM sodium dodecyl sulfate and 25 mM borate buffer (pH 9.2) with 9% acetonitrile, enabling the baseline resolution of the analytes within 13 min. Under the optimum conditions, satisfactory linearities (5–1000 ng/mL, r ≥ 0.9909), good reproducibility (RSD ≤ 6.7% for peak area, and RSD ≤ 2.8% for migration time), low detection limits (0.4–0.8 ng/mL) and acceptable recovery rates (89.6–105.7%) were obtained. The proposed method was successfully applied to 22 Chinese white spirits, and the content of dibutyl phthalate in 55% of the samples exceeded the Specific Migration Limit of 0.3 mg/kg established by the domestic and international regulations.
研究领域:
分析化学
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食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 39
·期 5
·857-863
·
IF 2.737
Qilong Xie,Dekui Sun,Yangying Han,Litao Jia,Bo Hou,Shuhui Liu,Debao Li
The previously reported procedure for the determination of the total phthalate in fatty food involved the extraction of phthalates using chloroform/methanol followed by the removal of the solvents before alkaline hydrolysis requiring 20 h and derivatization of phthalic acid. In this study, a phase-transfer catalyst (tetrabutylammonium chloride) was used in the liquid–liquid heterogeneous hydrolysis of phthalates in oil matrix shortening the reaction time to within 25 min. The resulting phthalic acid in the hydrolysate was extracted by a novel molecular complex based dispersive liquid–liquid microextraction method coupled with back-extraction before high-performance liquid chromatography coupled with photodiode array detection. Under the optimal experimental conditions, the linearity of the method was in the range of 0.5–12 nmol/g with the correlation coefficients ( r ) >0.997. The detection limit (S/N = 3) was 0.11 nmol/g. Intraday and interday repeatability values expressed as relative standard deviation were 3.9 and 7.1%, respectively. The recovery rates ranged from 82.4 to 99.0%. The developed method was successfully applied for the analysis of total phthalate in seven edible oils.
研究领域:
分析化学
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食品安全
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
·
2016
·
IF 5.929
Ping Xiang,Rui-Wen He,Yong-He Han,Hong-Jie Sun,Xin-Yi Cui,Lena Q. Ma
Human cornea is highly susceptible to damage by dust. Continued daily exposure to housedust has been associated with increasing risks of corneal injury, however, the underlying mechanism has not been elucidated. In this study, a composite housedust sample was tested for its cytotoxicity on primary human corneal epithelial (PHCE) cells, which were exposed to dust at 5–320 μg/100 μL for 24 h. PHCE cell viability showed a concentration-dependent toxic effect, attributing to elevated intracellular ROS. Moreover, when exposed at > 20–80 μg/100 μL, dust-induced oxidative damage was evidenced by increased malondialdehyde and 8-hydroxy-2-deoxyguanosine (1.3–2.3-fold) and decreased antioxidative capacity (1.6–3.5-fold). Alteration of mRNA expression of antioxidant enzymes ( SOD1 , CAT , HO-1 , TRXR1 , GSTM1 , GSTP1 , and GPX1 ) and pro-inflammatory mediators ( IL-1β , IL-6 , IL-8 , TNF-α , and MCP-1 ) were also observed. Furthermore, the mitochondrial transmembrane potential was dissipated from 9.2 to 82%. Our results suggested that dust-induced oxidative stress probably played a vital role in the cytotoxicity in PHCE cells, which may have contributed to dust-induced impairment of human cornea.
研究领域:
眼科学
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毒理学
·
细胞生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Mingxia Sun,Juanjuan Feng,Jiaqing Feng,Haili Sun,Yang Feng,Xiangping Ji,Chunying Li,Sen Han,Min Sun
To improve the extraction efficiency of carbon fibers (CFs) toward organic pollutants, TiO 2 nanorod arrays (NARs) were grown in situ on CFs. Subsequently, biochar nanospheres and covalent organic framework nanospheres were separately introduced to functionalize the NARs. A sequence of materials was produced by regulating the reactant concentrations and characterized using a scanning electron microscope, an X-ray photoelectron spectrometer, an X-ray diffractometer, a Raman spectrometer, and a specific surface area analyzer. The materials were then deposited into separate poly(etheretherketone) tubes for in-tube solid-phase microextraction (IT-SPME). These tubes were evaluated with different types of organic pollutants (polycyclic aromatic hydrocarbons (PAHs), estrogens, bisphenols, and phthalate esters) using a combination of high-performance liquid chromatography and IT-SPME, and they exhibited diverse extraction performance. The extraction mechanism of each material is carefully discussed, and the structure–performance relationship is also summarized based on the chemical structures and extraction properties of the materials. The most efficient extraction materials for different analytes were discovered and used to develop analytical methods. Three online methods were used to sensitively detect PAHs, estrogens, and bisphenols in real water samples, respectively. Satisfactory results were obtained, including enrichment factors up to 6784, detection limits as low as 0.001 μg L −1 , linear ranges of 0.003–15.0 μg L −1 , and relative standard deviations ranging from 0.2% to 15.2%. The results indicate that these methods have some advantages over previous material-based methods.
研究领域:
环境科学
·
材料科学
·
分析化学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 22
·2111594
·
IF 19.924
Mengting Di,Xiaojun Sun,Lei Hu,Li Gao,Jie Liu,Xiaoming Yan,Xuemei Wu,Xiaobin Jiang,Gaohong He
Covalent organic frameworks (COFs) have permanent, nanometer-scale pores endowed with high porosity and thermal and chemical stability, which is widely used as composite membranes and applied in the field of separation. Conventional methods for preparing composite membranes, such as spray coating, spin coating, and pressure-assisted or vacuum-assisted filtration, have problems such as the selective layer can easily fall off. Here, an integrated casting–precipitation–evaporation method is proposed to prepare flexible COF composite membranes (DPBI/HTpBD). The DPBI/HTpBD composite membranes constructed with hollow spherical shell COF selective layer (HTpBD) and porous supporting layer are designed and applied in a vanadium flow battery. The excellent coulombic efficiency (CE, 99.5%) and voltage efficiency (VE, 81.1%) of batteries (180 mA cm −2 ) are achieved by the nanometre-scale pores of the hollow spherical shell COF selective layer. In addition, the rigid pore structure inside COF bonded by covalent bonds endows the DPBI/HTpBD composite membranes with outstandingly high temperature stability. Compared to that of the Nafion 212 and DPBI pristine membranes (CE reduces by 5.2%, 3.3%), the CE of DPBI/HTpBD-9 composite membrane-based cell only reduces by 0.9% as the temperature increases from 25 to 55 °C. This work provides a new preparation method for high ion-selective and high temperature stable battery membranes.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Changcai Wu,Yajie Ma,Dan Wang,Yongpan Shan,Xianpeng Song,Hongyan Hu,Xiangliang Ren,Xiaoyan Ma,Junyu Luo,Jinjie Cui,Yan Ma
As microplastics became the focus of global attention, the hazards of plastic plasticizers (PAEs) have gradually attracted people's attention. Agricultural soil is one of its hardest hit areas. However, current research of its impact on soil ecology only stops at the microorganism itself, and there is still lack of conclusion on the impact of soil metabolism. To this end, three most common PAEs (Dimethyl phthalate: DMP, Dibutyl phthalate: DBP and Bis (2-ethylhexyl) phthalate: DEHP) were selected and based on high-throughput sequencing and metabolomics platforms, the influence of PAEs residues on soil metabolic functions were revealed for the first time. PAEs did not significantly changed the alpha diversity of soil bacteria in the short term, but changed their community structure and interfered with the complexity of community symbiosis network. Metabolomics indicated that exposure to DBP can significantly change the soil metabolite profile. A total of 172 differential metabolites were found, of which 100 were up-regulated and 72 were down-regulated. DBP treatment interfered with 43 metabolic pathways including basic metabolic processes. In particular, it interfered with the metabolism of residual steroids and promoted the metabolism of various plasticizers. In addition, through differential labeling and collinear analysis, some bacteria with the degradation potential of PAEs, such as Gordonia , were excavated.
研究领域:
微生物学
·
环境科学
·
代谢组学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Xiaomei Liu,Jingkang Ma,Saisai Guo,Qingying Shi,Jingchun Tang
The environmental and human health risks posed by nanoplastics have attracted considerable attention; however, research on the combined toxicity of nanoplastics and plasticizers is limited. This study analyzed the combined effects of nanoplastics and dibutyl phthalate (DBP) on Streptomyces coelicolor M145 (herein referred to as M145) and its mechanism. The results demonstrated that when the concentration of both nanoplastics and DBP was 1 mg/L, the co-addition was not toxic to M145. When the DBP concentration increased to 5 mg/L, the combined toxicity of 1 mg/L nanoplastics and 5 mg/L DBP reduced when compared to the 5 mg/L DBP treatment group. Similarly, the combined toxicity of 10 mg/L nanoplastics and 1 mg/L DBP on M145 was also lower than that of only 10 mg/L nanoplastics. The co-addition of 10 mg/L nanoplastics and 5 mg/L DBP resulted in the lowest survival rate (41.3%). The key reason for differences in cytotoxicity were variations in the agglomeration of nanoplastics and the adsorption of DBP on nanoplastics. The combination of 10 mg/L nanoplastics and 5 mg/L DBP maximized the production of antibiotics; actinorhodin and undecylprodigiosin yields were 3.5 and 1.8-fold higher than that of the control, respectively. This indicates that the excessive production of antibiotics may be a protective mechanism for bacteria. This study provides a new perspective for assessing the risk of co-exposure to nanoplastics and organic contaminants on microorganisms in nature.
研究领域:
环境科学
·
微生物学
·
毒理学
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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）