RSC Advances
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2018
·Vol. 8
·期 69
·39274-39283
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IF 2.936
D. Zhang,S. G. Lu,X. Q. Song,J. F. Zhang,Z. M. Huo,H. T. Zhao
The removal of phenanthrene and iodine from aqueous solutions in single and binary systems by inactivated soil indigenous bacterial biomass (SIBB), as well as affecting factors, were evaluated. Sorption kinetic and isotherm studies were carried out to investigate the synergistic effects of phenanthrene and iodine. Optimal parameters for the biosorption process included a solution pH of 6.0 and biosorbent dosage of 0.75 g L−1. The ionic strength significantly decreased the biosorption of both phenanthrene and iodine in single conditions, while no obvious influences were found in the binary conditions. A pseudo-second-order model was well fitted to the kinetic biosorption data for both phenanthrene and iodine. The results showed that the presence of co-solute accelerated the biosorption processes and the pseudo-second-order biosorption rates (k2) for phenanthrene and iodine increased from 0.005441 to 0.009825 g mg−1 min−1 and from 0.000114 to 0.000223 g mg−1 min−1, respectively. The SIBB showed strong affinity with both phenanthrene and iodine, with a partition coefficient Kd (Linear model) of 6892.4 L kg−1 for phenanthrene and affinity parameter KL (Langmuir model) of 232 500 L kg−1 for iodine. The presence of co-solute illustrated a synergistic effect on the biosorption of phenanthrene and iodine due to intermolecular forces between phenanthrene and iodine, enhancing the Kd of 34.7% for phenanthrene and KL of 107.0% for iodine, respectively. The results suggested that SIBB was an effective material for the simultaneous biosorption of phenanthrene and iodine from aqueous solutions.
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MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Fengkai Shang,Yutian Wang,Junzhu Wang,Ling Zhang,Pengfei Cheng,Shutao Wang
The content of polycyclic aromatic hydrocarbons (PAHs) in tea has attracted widespread attention. In this study, the strategy of four-way fluorescence data coupled with third-order calibration method based on four way parallel factor analysis (four-way PARAFAC) was used to determine phenanthrene , naphthalene and acenaphthene in tea. A new method, introducing an additional temperature mode into the three-way fluorescence data set, was proposed to acquire a four-way data array. The feasibility of the method was validated by experiments. The four-way PARAFAC could give satisfactory analytical results for the determination of three PAHs in tea. The average spiked recoveries were (100.9 ± 7.8)% for phenanthrene, (94.6 ± 8.6)% for naphthalene, (96.0 ± 9.8)% for acenaphthene. The root-mean-square error of prediction (RMSEP) values were 0.495 μg L −1 for phenanthrene, 0.841 μg L −1 for naphthalene, 0.577 μg L −1 for acenaphthene. The average relative predictive errors (ARPE) values for three PAHs were <2.35%. The limits of detection (LOD) of three PAHs were between 0.026 and 0.14 μg L −1 . Generally, these results obtained by four-way PARAFAC were better than that of three-way PARAFAC. In addition, analytical figures of merit, such as Sensitivity, Selectivity and Analytical sensitivity, were calculated for three PAHs to evaluate the methods. The results demonstrated that the four-way PARAFAC was more suitable for the determination for three target analytes in this study.
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International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 3
·441
·
IF 2.468
Yanhua Qiu,Meilan Xu,Zongquan Sun,Helian Li
There is increasing concern regarding soils contaminated with polycyclic aromatic hydrocarbons (PAHs).In the present study, the remediation of soil spiked with PAHs was explored by the combination of soil washing with sodium dodecyl sulfate (SDS) and subsequent oxidation through persulfate (PS) activated by Fe2+, nanoscale zero-valent iron (nZVI), and SiO2-coated nZVI (SiO2/nZVI). Results demonstrated that the removal of phenanthrene (PHE), fluoranthene (FLU), and pyrene (PYR) by SDS is an efficient means for soil decontamination. At SDS concentration of 20 g/L, the removal efficiencies of PHE, PYR, and FLU were 37%, 40%, and 44%, respectively. For the degradation of PAHs and SDS in the soil washing effluents, the efficiencies of PS activated with SiO2/nZVI were not significantly different from those of PS activated with nZVI and Fe2+(p> 0.05). In practice, SiO2/nZVI is more preferable due to the improved antioxidation and dispersibility. At the dosage of 2 g/L (in the amount of iron) of SiO2/nZVI, the removal efficiencies of PHE, FLU, PYR, and SDS within 30 min of treatment were 75%, 85%, 87%, and 34%, respectively. The degradation of SDS was much lower than those of PAHs, which facilitated the recycle of SDS. Our findings suggest that PS activated with SiO2/nZVI is a promising method for the treatment of soil washing effluents containing SDS and PAHs.Keywords:soil remediation;PAHs;SDS;SiO2/nZVI;activated persulfate
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ADSORPTION SCIENCE & TECHNOLOGY
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2018
·
IF 0.609
Liyun Yang,Xiaoming Qian,Zhi Wang,Yuan Li,Hao Bai,Hong Li
This study investigates the removal effectiveness and characteristics of phenanthrene and naphthalene using low-cost steel slag with batch experiments. The adsorption characteristics of steel slag were measured and analysed using X-ray fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy. The batch experiments investigated the effect of the time gradient, pH, and steel slag dosage gradient on the adsorption of the steel slag. The results show that with time and dosage of steel slag increased, the adsorption capacity of phenanthrene and naphthalene increased and gradually became balanced, but pH had no obvious effect on the adsorption of phenanthrene and naphthalene. The Langmuir isotherm model best describes the phenanthrene and naphthalene removal by the steel slag, which shows the adsorption occurring in a monolayer. The maximum adsorption capacity of the steel slag to phenanthrene and naphthalene is 0.043 and 0.041 mg/g, respectively. A pseudo-first-order kinetic model can better represent the adsorption of phenanthrene and naphthalene by steel slag. The research demonstrates that the steel slag has a certain adsorption capacity for phenanthrene and naphthalene.
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ANALYTICA CHIMICA ACTA
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2018
·
IF 5.123
Yinhui Yang,Zhengfeng Chang,Xiaohong Yang,Meiling Qi,Jinliang Wang
Herein we report a propeller-like hexaphenylbenzene-based hydrocarbon material (denoted as BT) as the stationary phase for capillary gas chromatography (GC). The statically-coated BT capillary column showed a high column efficiency of 4340 plates m −1 and weak polarity. Owing to its unique conformation, π-electron toroidal delocalization and intrinsic microporosity , the BT stationary phase exhibited interesting selectivity for aromatic compounds over alkanes. Compared with the graphene (G) column, the BT column showed much prolonged retention and high selectivity for aromatic isomers, especially methylnaphthalenes , dimethylnaphthalenes and phenanthrene/anthracene, mainly because of its propeller-like conformation with rich intercalation effects. Moreover, it exhibited good column repeatability (intra-day, inter-day) and reproducibility (between-column) with RSD values on the retention times less than 0.08% for intra-day, 0.32% for inter-day and 3.8% for between-column, respectively. Also, it showed good potential for determination of minor isomer impurities in real samples. To the best of our knowledge, this work presents the first example of employing an neat aromatic hydrocarbon material as the GC stationary phase with high selectivity for analytes of a wide ranging polarity.
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APPLIED CLAY SCIENCE
·
2018
·
IF 3.641
Bo Ruan,Pingxiao Wu,Xiaolin Lai,Huimin Wang,Liping Li,Liya Chen,Chunxi Kang,Nengwu Zhu,Zhi Dang,Guining Lu
The objective of this study was to investigate the interaction between stearic acid-modified montmorillonite (SA-Mt) and Sphingomonas sp. GY2B and its effect on the physical and chemical properties of montmorillonite in the 2 days' biodegradation of phenanthrene . Due to bacterial activities , surface and colloidal properties of the bacteria-treated sample evidently changed in comparison with the untreated SA-Mt. Changes in surface morphology and the agglomerate state of SA-Mt were clearly observed by scanning electron microscopy (SEM) after interaction with GY2B for 2 days. Although the interlayer space of SA-Mt structure remained basically unchanged, the decrease of the structural order and the appearance and shift of several absorbance bands in the Fourier transform infrared (FTIR) spectra verified the structural changes of SA-Mt after bacterial treatment . Besides, the second derivative infrared spectra indicated that bacterial growth and metabolism largely affected the microstructure in SA-Mt. Dissolution rates of major elements were obtained by inductively coupled plasma optical emission spectroscopy (ICP-OES) in the solution, which revealed that bacterial activities enhanced the release of major elements and brought about a significant higher dissolution of Si preferentially from the tetrahedral sheet edges of SA-Mt than Al. The improvement of elemental dissolution in the biotic experiment was attributed to the combined action of pH effect and ligand-promoted process. These results substantiated that microorganisms have a considerable influence on the physicochemical properties and structure in the clay-modulated biodegradation of organic compounds. This study has profound impacts on the clay-modulated biodegradation of hydrophobic organic contaminants in the environment.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Bin Qiao,Yansong Li,Pan Hu,Yu Sun,Zhaozhao Si,Shiying Lu,Honglin Ren,Zengshan Liu,Ying Zhang,Lei Meng,Yu Zhou
Fluorene is a priority pollutant in water listed by U.S. Environmental Protection Agency. A fluorescent probe using Eu(III)-marked polystyrene nanoparticles (EuNPs) labelled with a monoclonal antibody (MAb) was synthesized and an immunochromatographic assay (ICA) based on the probe (EuNPs-MAb) was developed for rapid and sensitive detection of fluorene in water samples. The concentration of fluorene was inversely proportional to fluorescence intensity values of T-line in the range 0.98–62.50 ng/mL. The limit of detection (LOD) for quantitative detection of fluorene was 0.09 ng/mL. Recoveries of fluorene in various water samples ranged from 81.50% to 103.00% and coefficients of variation (CVs) were below 13%, which were in a good agreement with those of traditional ELISA (R 2 = 0.99). The assay can be performed within 30 min. The integrated ICA strip gave higher sensitivity and reliable reproducibility. It could be a potential method for rapid and sensitive detection of fluorene in water samples.
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JOURNAL OF SURFACTANTS AND DETERGENTS
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2018
·Vol. 21
·期 6
·845-858
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IF 1.454
Yan Li,Lu Lai,Ping Mei,Sheng-Jin Li,Li Cheng,Zhao-Hua Ren,Yan-Cheng Zheng,Yi Liu
The equilibrium and dynamic surface properties of cationic/anionic surfactant mixtures of carboxylate gemini surfactant (CGS12) and quaternary ammonium salts with different alkyl chain lengths were investigated, and the synergistic properties and solubilization capacity toward phenanthrene of these mixtures were evaluated. Results show that all cationic/anionic surfactant mixtures exhibit negative interaction parameters, indicating the strong synergistic effects in the reduction of surface tension and the formation of micelles. When the mixing ratio is 1:1, the surface tension reaches the minimum value. Moreover, as the alkyl chain length increases, the interaction parameters become more negative. In addition, the thermodynamic parameters suggest that the formation of mixed micelles is exothermic with a positive change in entropy. The tendency of dynamic surface tension curves of these mixtures is similar to that of pure CGS12. At the same concentration, these mixtures exhibit a higher adsorption rate than pure surfactants, and a lower adsorption potential barrier than cationic surfactants. However, for the CGS12/stearyltrimethylammonium bromide mixture, the drop rate constant of surface tension is lower than that of either component. Compared with the pure surfactant solutions, the cationic/anionic surfactant mixtures exhibit higher solubilization capacity toward phenanthrene. As the length of the alkyl chain increases, the solubilization capacity of the mixed cationic/anionic surfactant increases.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
·
IF 3.412
Ning Li,Di Wu,Na Hu,Guangsen Fan,Xiuting Li,Jing Sun,Xuefeng Chen,Yourui Suo,Guoliang Li,Yongning Wu
The present study reported a facile, sensitive, and efficient method for enrichment and determination of trace polycyclic aromatic hydrocarbons (PAHs) in food samples by employing new core–shell nanostructure magnetic covalent organic framework hybrid microspheres (Fe3O4@COF-(TpBD)) as the sorbent followed by HPLC-DAD. Under mild synthetic conditions, the Fe3O4@COF-(TpBD) were prepared with the retention of colloidal nanosize, larger specific surface area, higher porosity, uniform morphology, and supermagnetism. The as-prepared materials showed an excellent adsorption ability for PAHs, and the enrichment efficiency of the Fe3O4@COF-(TpBD) could reach 99.95%. The obtained materials also had fast adsorption kinetics and realized adsorption equilibrium within 12 min. The eluent was further analyzed by HPLC-DAD, and good linearity was observed in the range of 1–100 ng/mL with the linear correlation being above 0.9990. The limits of detection (S/N = 3) and limits of quantitation (S/N = 10) for 15 PAHs were in the range of 0.83–11.7 ng/L and 2.76–39.0 ng/L, respectively. For the application, the obtained materials were employed for the enrichment of trace PAHs in food samples and exhibited superior enrichment capacity and excellent applicability.
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JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Tianfu Wei,Zhengyi Chen,Gongke Li,Zhuomin Zhang
Aflatoxins are highly toxic mycotoxin contamination, which pose serious food safety incidents. It is very important to precisely and rapidly determine trace aflatoxins in food. In this study, we designed porous monolithic column based on covalent cross-linked polymer gels for online extraction and analysis of trace aflatoxins in food samples with complicated matrices coupled with high-performance liquid chromatography-ultraviolet detector (HPLC-UV). The prepared monolithic column showed excellent enrichment performance due to its good permeability, good reproducibility and long life span. The study of adsorption mechanism suggested that the excellent enrichment performance of this monolithic column was attributed to the multiple effect of π-π stacking interaction, hydrophobic effect and steric effect. When the online analytical method was applied for the determine of trace aflatoxins in real food samples, aflatoxins G 1 and aflatoxins B 1 could be actually found in one positive bean sauce sample and quantified to be 32.8 and 26.4 μg/kg, respectively. Aflatoxins G 1 in one bean sample could be also found and quantified to be 25.9 μg/kg. The low detection limits of the developed method were achieved in range of 0.08-0.2 μg/kg. And the recoveries for spiked samples were in range from 76.1 to 113% with RSDs of 1.1-9.6%. The developed method was proved to be a promising method for online enrichment and analysis of trace aflatoxins in complicated food samples.
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CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 4
·595-610
·
IF 1.401
Liu Wei,Quan Ji
In this work, a quantitative structure–property relationship (QSPR) model based on atom-type electrotopological state (E-state) indices has been developed for predicting the dispersive liquid–liquid microextraction (DLLME) enrichment effect for aromatic organics by using 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIM][PF 6 ]) ionic liquid as extractant. The enrichment factors of the aromatic organics obtained through DLLME-IL process were used as the dependent variable of the multiple linear regression (MLR) equation. The E-state indices of those organic compounds which combined together both electronic and topological characteristics of the analyzed molecules were used as molecular structure descriptors and the independent variable of the equation. The squared correlation coefficient R 2 for the MLR was 0.992 for the training set of 33 compounds. For the test set of 8 compounds, the linear regression coefficient was R 2 = 0.985. The results of this study showed that it can successfully predict enrichment factors of [OMIM][PF 6 ] in DLLME by using atom-type E-state indices, which can provide one more way for predicting the ability of ionic liquid to extract organic compounds based on their molecular structures.
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TALANTA
·
2018
·
IF 4.244
Xiao Sun,Jing Li,Li Xu
In the present study, the narrow-dispersed penetrable poly(methacrylic acid- co -ethylene glycol dimethacrylate) (poly(MAA- co -EDMA)) microspheres were successfully synthesized based on the sacrificial support method. The poly(MAA- co -EDMA) microspheres mirrored the porous structure of the sacrificial support, i.e. penetrable silica, characteristic of copious mesopores and throughpores. In addition, they possessed large surface area, adjustable hydrophobicity and the cation-exchange ability. Owing to their multi functionalities, they were applied as chromatographic stationary phase to separate proteins in different separation modes, including reversed phase, hydrophobic interaction and weak cation exchange. Moreover, thanks to their throughpores, fast separation at low column backpressure could be achieved in these three modes. Both protein recovery and column stability were satisfactory. The penetrable poly(MAA- co -EDMA) microspheres were potential stationary phase matrix for fast protein separation.
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