JOURNAL OF CHROMATOGRAPHY A
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2016
·
IF 3.926
Nan Dong,Tao Li,Yujie Luo,Lin Shao,Zhu Tao,Chun Zhu
A novel solid-phase microextraction coating that contains perhydroxy cucurbit[6]uril((OH) 12 Q[6]) was prepared by a sol–gel method. (OH) 12 Q[6] was used as a starting coating material with hydroxy-terminated poly(dimethylsiloxane) (OH-PDMS) to bond chemically to a fused-silica substrate using 3-(2-cyclooxypropoxyl)propyltrimethoxysilane as cross-linking agent; hydrolysis and polycondensation reactions then led to the formation of a (OH) 12 Q[6]/PDMS-coating. The coating has a high thermal stability (360 °C), long lifetime and can withstand organic and inorganic solvent rinsing because of the chemical binding between the coating and silica substrate. Its performance was tested by headspace (HS) solid-phase microextraction fiber coupled with gas chromatography to determine polycyclic aromatic hydrocarbon (PAHs) compounds in water samples. The (OH) 12 Q[6]/PDMS-coated fiber exhibited higher enrichment factors from fourfold for naphthalene to tenfold for pyrene compared with commercial PDMS fiber, and the enrichment factors increased with the number of condensed PAH rings. The strong adsorption affinity is believed to be attributed to hydrogen bonding and C H⋯π interactions between PAHs and (OH) 12 Q[6], according to the results of quantum chemical calculations. In the PAH analysis, the (OH) 12 Q[6]-coated fiber showed a good repeatability (< 4.7%) and reproducibility between fibers (< 9.4%), low detection limits (0.03–0.15 μg L −1 ), and a wide linearity (0.1–1000 μg L −1 ) under optimized conditions. This method was used for the simultaneous determination of seven PAHs with satisfactory recoveries of 90.56%–107.4% for Huaxi river water samples and 90.23%–109.5% for local wastewater samples, respectively.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yan Zhang,Wenqi Zhang,Lin Wang,Feng Wang,Haifeng Yang
We reported a simple and fast method to prepare a composite material of polydopamine (PDA) adlayer covered cubic AgCl core, which was inlaid with Ag nanoparticles (NPs), shortly named as AgCl/PDA/AgNPs. The resultant AgCl/PDA/AgNPs could be employed as surface-enhanced Raman scattering (SERS) substrate for in-situ detection and the SERS activity could be further greatly improved due to the production of more AgNPs upon laser irradiation. With 4-mercaptopyridine (4-Mpy) as the probe molecule, the enhancement factor could reach 10 7 . Additionally, such SERS substrate shows good reproducibility with relative standard deviation of 7.32% and long term stability (after storage for 100 days under ambient condition, SERS intensity decay is less than 25%). In-situ elevating SERS activity of AgCl/PDA/AgNPs induced by laser may be beneficial to sensitive analysis in practical fields.
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Analytical Methods
·
2016
·Vol. 8
·期 42
·7587-7596
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IF 1.915
Shaojie Jia,Dan Li,Essy Kouadio Fodjo,Hu Xu,Wei Deng,Yue Wu,Yuhong Wang
Synthesis of high-quality metal nanoparticle (NP) decorated graphene (GN) with uniform and controllable nanostructures has attracted considerable attention due to its excellent electronic structure and optical properties. Herein, we develop a facile and robust process for tailoring hexanethiol (SH)-modified Ag NP-decorated graphene nanomaterials (Ag/GN-SH) by coupling in situ reduction and the covalent assembly technique. The as-prepared Ag/GN-SH combines adequate Raman “hot spots” among the high-density Ag NPs and the excellent adsorption performance of GN, making it an excellent surface-enhanced Raman scattering (SERS) substrate for highly selective and sensitive detection of PAHs. Moreover, the Ag/GN-SH can be used as a solid-phase extraction (SPE) adsorbent for qualitative and quantitative detection of PAHs in seawater from their discriminant SERS peaks. The Ag/GN-SH-based SPE-SERS is effective over a wide range of concentrations (0.1 nM to 0.5 mM) for PAHs, with tens of pM detection limits [signal to noise ratio (S/N) = 3], and the detection concentration deviation is less than 15% between the SPE-SERS and GC-MS. This study not only offers a new method for on-site removal of PAHs but also provides a strategy for simultaneous multiplexed detection of PAHs.
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RSC Advances
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2017
·Vol. 7
·期 73
·45978-45986
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IF 3.108
Na Wen,Chunmei Gao,Shaoyu Lü,Xiubin Xu,Xiao Bai,Can Wu,Piao Ning,Shaofei Zhang,Mingzhu Liu
The high pKa (8.26 to 8.6) of PBA has restricted its glucose-responsiveness in physiological conditions, and the high cytotoxicity of polymers is also a limiting problem in their potential application for insulin delivery. Novel amphiphilic glucose-sensitive dialdehyde starch polymers containing 3-aminophenylboronic acid (APBA) as a glucose-responsive group and mPEGylated dialdehyde starch (mPEG-DAS) with hydrophobic 7-hydroxycoumarin-4-acetic acid (Cou) were synthesized. This dialdehyde starch derivative can self-assemble into mPEG-DAS–APBA–Cou micelles with “shell–core” structures in phosphate-buffered saline solution (PBS). In addition, the drug-loaded micelles can release insulin rapidly in response to hyperglycemia in a physiological environment. The results demonstrated that the mPEG-DAS–APBA–Cou micelles showed notable glucose responsive behavior near the physiological range. The insulin release from the nanocarriers is sensitive to different concentrations of glucose, releasing insulin rapidly under the conditions of 3 mg mL−1 glucose while demonstrating comparatively inert release at 1 mg mL−1 glucose (pH 7.4). MTT assays and hemolysis studies both confirmed that the mPEG-DAS–APBA–Cou micelles have low cytotoxic activity to A549 cells and low blood toxicity. These results suggest that the glucose-sensitive dialdehyde starch micelles (mPEG-DAS–APBA–Cou) have potential applications as a glucose-responsive material for insulin delivery.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2017
·Vol. 24
·期 23
·18946-18952
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IF 2.741
Liu Xiaoyan,Cao Liya,Wang Qian,Zhang Xinying,Hu Xiaoxin
Tea saponin (TS), a kind of green biosurfactant produced by plants, was added into the Cd–pyrene co-contaminated soils to evaluate its influence on phytoremediation of Cd and pyrene by Lolium multiflorum . The results showed that the accumulation of pyrene in L. multiflorum was significantly promoted by the TS. Compared with no TS treatments (PL and ML), the aboveground concentrations of pyrene in TS treatments (PLT and MLT) increased by 135 and 30%, respectively, and the underground concentrations of pyrene in TS treatments (PLT and MLT) increased by 40 and 25%. The concentrations of Cd in the aboveground and underground parts in single contaminated treatments were all significantly more than those in co-contaminated treatments, while the situation of pyrene was quite the reverse. Besides, the addition of TS enhanced activities of dehydrogenase and polyphenol oxidase in soils and increased the biomass of L. multiflorum . The micromorphology of L. multiflorum was not affected by TS. The study suggests that the use of L. multiflorum with TS is an alternative technology for remediation of Cd–pyrene co-contaminated soils.
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Journal of Materials Chemistry B
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2017
·Vol. 5
·期 32
·6593-6600
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IF 4.543
Chao Shen,Shuyan Ge,Youyou Pang,Fengna Xi,Jiyang Liu,Xiaoping Dong,Peng Chen
Sensitive and selective detection of metal ions is important for environmental monitoring and biological studies because metal ions play crucial roles in many physiological and pathological processes including cellular metabolism, enzymatic activities, as well as DNA and RNA syntheses. In this work, new nitrogen and sulfur co-doped graphene quantum dots (N,S-GQDs) are synthesized and serve as fluorescence probes for parallel and specific detection of Fe3+, Cu2+ and Ag+ ions. The N,S-GQDs are synthesized based on one-step bottom-up molecular fusion in a hydrothermal process with a high yield of 87.8% and possibility of mass production. The as-prepared N,S-GQDs exhibit a single-layer graphene structure, high crystallinity and uniform size (∼2.1 nm). Successful co-doping of N and S atoms in the lattice of GQDs not only enables bright blue fluorescence with high absolute photoluminescence quantum yield (23.2%) but also provides unique selectivity towards some metal ions. With the help of different masking agents, N,S-GQDs are able to differentially detect Fe3+, Cu2+ and Ag+ ions in a mixture with low detection limits (8 nM, 250 nM and 50 nM, respectively). Moreover, detection of Fe3+, Cu2+ and Ag+ in complex biological (serum) and environmental samples (river water) is demonstrated.
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JOURNAL OF CHROMATOGRAPHY A
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2017
·
IF 3.981
Qingxiang Zhou,Man Lei,Yalin Wu,Yongyong Yuan
Metal-organic framework material has been paid more attention because of its good physical and chemical properties. Nanoscale zero valent iron is also in the center of concern recently. Combination of their merits will give impressive results. Present study firstly synthesized a new magnetic nanomaterial nano-scale zero valent iron-functionalized metal-organic framworks MIL-101 (Fe@MIL-101) by co-precipitation method. The morphology and structure of the as-prepared Fe@MIL-101 were characterized by transmission electron microscopy and X-ray diffraction, etc. The experimental results showed that Fe@MIL-101 earned good adsorption ability to polycyclic aromatic hydrocarbons. The limits of detection of developed magnetic solid phase extraction were all below 0.064 μg L −1 and precision can be expressed as relative standard deviation (RSD, %) and which was better than 4.4% (n = 6). The real water analysis indicated that the spiked recoveries were satisfied, and Fe@MIL-101 earned excellent reusability. All these demonstrated that Fe@MIL-101 exhibited excellent adsorption capability to polycyclic aromatic hydrocarbons and would be a good adsorbent for development of new monitoring methods for environmental pollutants.
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INTERNATIONAL BIODETERIORATION & BIODEGRADATION
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2017
·
IF 2.962
Weiwei Chen,Junde Li,Xiangnan Sun,Jun Min,Xiaoke Hu
A bacterial strain , CN-3, was isolated from petroleum-contaminated sediment in Bohai Bay, China. Morphological, physiological and phylogenetic analyses indicated that the strain belonged to the genus Dietzia . It was capable of utilizing a wide range of alkanes (C 14 –C 31 ), aromatic compounds and crude oil as the sole carbon and energy sources. The bacterium showed high degradation rate (>80%) of the saturated hydrocarbons of crude oil in the pH range of 6–9. The degradation rate was hardly affected at a NaCl concentration up to 85 g L −1 , indicating that the strain can tolerate high salinities . The real-time quantitative Polymerase Chain Reaction (PCR) results showed that the CYP153 genes could be significantly induced by C 14 , C 15 , C 16 , C 26 and pristane, whereas the transcription level of alk B gene was increased moderately with C 14 , C 15 , C 16 , C 26 and pristane induction condition. A high degradation extent, wide substrate range and facile conditions enhanced the potential for this bacterial strain to be used in the bioremediation of crude oil pollution.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 20
·20672-20679
·
IF 2.76
Chen Xiao,Li Hongbing,Liu Xiaoyan,Zhang Xinying,Liang Xia,He Chiquan,Cao Liya
The in situ chemical oxidation technology (ISCO) and phytoremediation for PAHs have been studied respectively, but few focus on the feasibility of combining persulfate with ryegrass. This literature revealed the effect of persulfate oxidation on the growth of ryegrass and the removal ratios of pyrene in the couple system of persulfate oxidation and phytoremediation. The results demonstrated that half of pyrene in test soil was oxidized by persulfate in 7 days and then the residual pyrene concentration was decreased to a lower level by ryegrass in the following 2 months in oxidation treatment and drip washing and plants (OWP) and oxidation treatment and drip washing and plants and fertilization (OWFP) treatment. Ryegrass could grow well after persulfate oxidation with the oxidized soil washed by water. Ryegrass in OWP and OWFP treatments had higher ratios of overground and underground biomass. However, the seeds of ryegrass cannot germinate when drip washing was omitted. Pyrene together with residual persulfate changed soil enzyme activities. Drip washing and the growth of ryegrass made soil enzyme activities tend to returned to normal levels. Persulfate oxidation and phytoremediation were compatible to make contributions to the dissipation of pyrene. Persulfate oxidation activated by heat had higher removal efficiency of PAHs and phytoremediation could further decrease the pyrene concentration in spiked soil.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Zijiong Li,Weiyang Zhang,Yanchun li,Haiyan Wang,Zhen Qin
Developing graphene based supercapacitor electrodes with enhanced performance are critical to their future energy storage devices. In this study, well-controlled pyrene decorated graphene composites (PGCs) are synthesized via a facile solvothermal and subsequent activated route. It has demonstrated that the optimized PGCs electrode exhibits 310.7 F g −1 at the current density of 1.5 A g −1 and an excellent cycle stability with a capacitance retention of 99% after 15,000 cycles. Furthermore, an asymmetric supercapacitor fabricated with the PGC 3 (the mass ratio of pyrene to grapheme is 3:1) as the positive electrode and graphene as the negative electrode exhibit high power density, high energy density and long cycling life span. These results demonstrate that the pyrene decorated graphene electrode provides greatly enhanced electrochemical performance and shows promising application as anode for energy storage.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Shiyue Bian,Chao Shen,Yuting Qian,Jiyang Liu,Fengna Xi,Xiaoping Dong
Sulfur-doped graphene quantum dots (S-GQDs) with bright blue emission have been prepared by a facile one-pot hydrothermal treatment. A specific compound, 1,3,6-trinitropyrene, which has a mother nucleus structure similar with graphene, was chosen as the carbon source and 3-mercaptopropionic acid (MPA) was employed for S-doping and carboxyl groups modification. The synthesized S-GQDs were characterized by atomic force microscopy (AFM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and fluoscence (FL) spectrum. Results indicated that S-GQDs possessed single layer graphene structure with mean size of about 2.5 nm and presented an excitation-independent photoluminescence behavior with maximum excitation/emission wavelength at 360/450 nm, respectively. The sulfur-doping of GODs drastically improved their electronic and chemical properties, which afforded the S-GQDs a sensitive response to Ag + ions. Furthermore, the S-GQDs were successfully explored as a sensing probe for Ag + detection with high sensitivity and selectivity. A wide linear range of 0.1-130.0 μM with a low detection limit of 30 nM was obtained. The facile preparation method and the high performace of the as-prepared S-GQDs present promising potential for their applications in sensing, biological imaging and catalysis.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Yu Tian,Ran Wei,Bo Cai,Jinfeng Dong,Bin Deng,Yuxiu Xiao
A series of novel cationic gemini surfactants with pyrrolidinium head groups, 1,1′-(butane-1,s-alkyl) bis (1-alkylpyrrolidinium) (C n -4-C n PB, n = 12, 14, 16), were employed as carriers in sweeping–micellar electrokinetic chromatography (sweeping-MEKC) for simultaneous detection of nine organic water pollutants , including polycyclic aromatic hydrocarbons, sulfonamides and steroids. The sweeping and separation conditions were optimized. C n -4-C n PB ( n = 12, 14, 16) were compared with cetyltrimethylammonium bromide (CTAB) in terms of their abilities to preconcentrate and separate the nine analytes. Under the optimized conditions, the sensitivity enhancement factors based on the peak height (SEFs Height ) were ca. 310–580 of C 16 -4-C 16 PB, which were higher than those of C 14 -4-C 14 PB (120–290) and C 12 -4-C 12 PB (110–160). Meanwhile, the SEFs Height of C 16 -4-C 16 PB were higher than those of 30% (v/v) methanol-modified CTAB (140–320). The C 16 -4-C 16 PB based sweeping-MEKC, coupled with offline solid phase extraction and UV detection (228 nm), was used to analyze spiked environmental water samples. The nine analytes were successfully separated and detected. The limit of detection (S/N = 3) was in range of 2.79–3.76 ng/mL, and the recovery ranged from 70.8% to 95.5% with the RSDs less than 9.89%. This study confirms that the C 16 -4-C 16 PB based sweeping-MEKC has significant advantages over the CTAB based sweeping-MEKC and it is a promising method for sensitive and simultaneous detection of polycyclic aromatic hydrocarbons, sulfonamides and steroids in environmental water samples.
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