OPTICS EXPRESS
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2016
·Vol. 24
·期 14
·A1148
·
IF 3.148
Ruifang Yang,Nanjing Zhao,Xue Xiao,Gaofang Yin,Shaohui Yu,Jianguo Liu,Wenqing Liu
It is still difficult to determine the concentrations of polycyclic aromatic hydrocarbons accurately in natural water by fluorescence technique because of their low solubility, different fluorescent intensity, and the complex interferents from water environments. In this work, three-way fluorescence spectra combined with three methods including three-way parallel factor analysis, multi-way partial least square with residual bilinearization and unfolded partial least square with residual bilinearization were used to predict the concentrations of polycyclic aromatic hydrocarbons at the μg L−1 level in reservoir and river water, respectively. The prediction abilities of these methods on different analytes were evaluated by validation sets. The results demonstrate that unfolded partial least square with residual bilinearization yields the optimal results with relative error less than or equal to 6% for phenanthrene, pyrene, anthracene and fluorene, and 35% for acenaphthene and fluoranthene in different water backgrounds.
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CHEMOSPHERE
·
2017
·
IF 4.208
Yong Li,Ling Long,Jing Ge,Li-xuan Yang,Jin-jin Cheng,Ling-xiang Sun,Changying Lu,Xiang-yang Yu
Polycyclic aromatic hydrocarbons (PAHs) accumulated in agricultural soils are likely to threaten human health and ecosystem though the food chain, therefore, it is worth to pay more attention to soil contamination by PAHs. In this study, the presence, distribution and risk assessment of 16 priority PAHs in rice-wheat continuous cropping soils close to industrial parks of Suzhou were firstly investigated. The concentrations of the total PAHs ranged from 125.99 ng/g to 796.65 ng/g with an average of 352.94 ng/g. Phenanthrene (PHE), fluoranthene (FLT), benzo [a] anthracene (BaA) and pyrene (PYR) were the major PAHs in those soil samples. The highest level of PAHs was detected in the soils around Chemical plant and Steelworks, followed by Printed wire board, Electroplate Factory and Paper mill. The composition of PAHs in the soils around Chemical plant was dominated by 3-ring PAHs, however, the predominant compounds were 4, 5-ring PAHs in the soils around other four factories. Meanwhile, the concentration of the total PAHs in the soils close to the factories showed a higher level of PAHs in November (during rice harvest) than that in June (during wheat harvest). Different with other rings of PAHs, 3-ring PAHs in the soils around Chemical plant and Steelworks had a higher concentration in June. The results of principal component analysis and isomeric ratio analysis suggested that PAHs in the studied areas mainly originated from biomass, coal and petroleum combustion. The risk assessment indicated that higher carcinogenic risk was found in those sites closer to the industrial park.
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Polymer Chemistry
·
2016
·Vol. 7
·期 27
·4559-4566
·
IF 5.687
Qing Wan,Meiying Liu,Dazhuang Xu,Liucheng Mao,Hongye Huang,Peng Gao,Fengjie Deng,Xiaoyong Zhang,Yen Wei
Fluorescent organic nanoparticles (FNPs) with intensive luminescence are widely applied in various biomedical fields, but the malicious aggregation caused quenching effect of conventional organic dyes hampers their biomedical application. In this work, we report a facile and highly efficient method for fabrication of FNPs with a stable cross-linked structure and enhanced luminescence via a one-pot mercaptoacetic acid locking imine reaction, in which a hydrophobic aggregation induced emission (AIE) dye (AHAn) and hydrophilic polylysine (Plys) were used as two reaction components, while mercaptoacetic acid acted as the lock to conjugate AHAn and Plys. The final amphiphilic fluorescent materials (Plys&AHAn&Plys) are readily formed FNPs in aqueous solution and exhibit high water dispersibility and strong luminescence. Furthermore, Plys&AHAn&Plys FNPs display low toxicity and good biological imaging performance. Altogether, we have developed a rather facile one-pot multicomponent reaction (MCR) to fabricate AIE active FNPs, which shows many promising properties for biomedical applications. More importantly, the MCR strategy could also be used for fabrication of many other multifunctional AIE active polymeric nanoprobes due to its good substrate adaptability and high efficiency.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2016
·
IF 0.566
Ya-Li WANG,Li-Qin YOU,Yu-Wen MEI,Jian-Ping LIU,Li-Jun HE
A benzyl functionalized ionic liquid, 1-benzyl-3-methylimidazolium bis [(trifluoromethyl) sulfonyl] imide ([BeMIM][Tf 2 N]), was synthesized and used as an extraction solvent of dispersive liquid-liquid microextraction (DLLME) for enrichment and determination of 5 kinds of organophosphorus pesticides (phoxim, fenitrothion, chlorpyrifos, phorate and parathion) and 2 kinds of aromatic compounds (chloronaphthalene and anthracene) in environmental water samples by high-performance liquid chromatography (HPLC). [BeMIM][Tf 2 N] had higher extraction efficiency than 1-octyl-3-methylimidazolium bis [(trifluoromethyl)sulfonyl] imide and common organic solvents such as carbon tetrachloride and tetrachloroethylene. The extraction was performed using 40 μL of [BeMIM][Tf 2 N] as respective extraction solvent and 1 mL of methanol as dispersive solvent with centrifugal time of 5 min. Under the optimal conditions, the proposed method exhibited a good linearity for all analytes with correlation coefficients of 0.9994−0.9998. The precision, described as intra-day and inter-day relative standard deviations (RSDs) of five replicate experiments at three different concentrations of 10, 40 and 100 μg L −1 , was 1.1%–4.3% and 0.8%–4.8%, respectively. The limits of detection (LODs) were 0.01–1.0 µg L −1 ( S/N = 3). The developed method was convenient, rapid and applicable to detection of the analytes in real environmental water samples with satisfactory recovery of 82.7%–118.3% and RSDs of 0.7%–5.6%. Introduction of benzyl group into the imidazolium could considerably elevate the extraction efficiecny of the analytes due to enhanced π-π interaction between [BeMIM][Tf 2 N] and analytes. [BeMIM][Tf 2 N] was a satisfactory extraction solvent with a high enrichment factor of 339 and extraction efficiency of 81.4%. The partition coefficients of all analytes in [BeMIM][Tf 2 N]-DLLME system were determined and the extraction mechanism was discussed.
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BIORESOURCE TECHNOLOGY
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2016
·
IF 4.917
Yimeng Wang,Jie Wang
The pinewood was pyrolyzed in the first reactor at a heating rate of 10 °C min −1 from room temperature to 700 °C, and the vapor was allowed to be cracked through the second reactor in a temperature range of 450–750 °C without and with HZSM-5. Attempts were made to determine a wide spectrum of gaseous and liquid products, as well as the mass and element partitions to gas, water, bio-oil, coke and char. HZSM-5 showed a preferential deoxygenation effect via the facilitated decarbonylation and decarboxylation with the inhibited dehydration at 550–600 °C. This catalyst also displayed a high selectivity for the formations of aromatic hydrocarbons and olefins by the promoted hydrogen transfer to these products at 550–600 °C. The bio-oil produced with HZSM-5 at 500–600 °C had the yields of 14.5–16.8%, the high heat values of 39.1–42.4 MJ kg −1 , and the energy recoveries of 33–35% (all dry biomass basis).
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JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Yunzhong Zheng,Qing Han,Meiling Qi,Liangti Qu
Seaweed-like graphitic carbon nitride (g-C 3 N 4 ) has a unique porous architecture composed of interlocking g-C 3 N 4 nanofibers (NF-C 3 N 4 ) with much higher surface area than bulk g-C 3 N 4 and shows good potential in separation science. This work investigated the separation performance of NF-C 3 N 4 as stationary phase for capillary gas chromatographic (GC) separations. The NF-C 3 N 4 column exhibits weak polarity and high column efficiency of 4728 plates/m for n -dodecane. Importantly, it displays good separation performance for a wide range of analytes and shows different retention behaviors from the bulk g-C 3 N 4 column and commercial HP-5MS column with 5% phenylpolysiloxane. Particularly, it shows high resolving capability for both aliphatic and aromatic isomers. In addition, NF-C 3 N 4 column has high thermal stability up to 280 °C and good separation repeatability with relative standard deviation (RSD) values in the range of 0.29–0.61% for intra-day, 0.56–1.1% for inter-day and 2.0–4.9% for between-column, respectively. Moreover, it was applied for the determination of isomer impurities in real samples, showing good potential in GC applications.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Zi Long,Meiying Liu,Ruming Jiang,Qing Wan,Liucheng Mao,Yiqun Wan,Fengjie Deng,Xiaoyong Zhang,Yen Wei
Fluorescent organic nanoparticles (FONs) with aggregation-induced emission (AIE) features have been extensively investigated for bio-imaging applications because of their unique AIE properties, biocompatibility, and well designability. In this work, AIE-active FONs have been fabricated via a “one pot” mercaptoacetic acid locking imine (MALI) reaction, in which aldehyde groups containing AIE-active dye (named as CHO-An-CHO) was covalently conjugated with NH 2 -terminated polymers (PEG-PABA) to form amphiphilic luminescent polymers using mercaptoacetic acid (MTA) as the “lock” molecule. These final polymers (denoted as PEG-PABA-An-CHO) possessed amphiphilic properties and could self-assemble into PEG-PABA-An-CHO FONs with excellent water dispersibility. Furthermore, thus PEG-PABA-An-CHO FONs displayed enhanced luminescence in aqueous solution due to the aggregation of AIE feature of CHO-An-CHO. More importantly, thus final PEG-PABA-An-CHO FONs exhibited desirable biocompatibility and fluorescent imaging performance. As compared with traditional stepwise methods that are laborious, time-consuming and involve separation and purification of intermediate products, thus “one pot” strategy relied on MALI reaction showed distinct advantages, including simplicity, high efficiency, universality and atom-economy. Thanks to the good applicability of MCR-MALI reaction towards different substrates, this “one pot” strategy should be a useful tool for preparing sophisticated and multifunctional AIE-active materials for different applications potential.
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TALANTA
·
2016
·
IF 4.035
Li-Shun Zhang,Qing-Li Zhao,Xin-Xin Li,Xi-Xi Li,Yan-Ping Huang,Zhao-Sheng Liu
A hybrid monolith incorporated with mesoporous molecular sieve MCM-41 of uniform pore structure and high surface area was prepared with binary green porogens in the first time. With a mixture of room temperature ionic liquids and deep eutectic solvents as porogens, MCM-41 was modified with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS) and the resulting MCM-41-MPS was incorporated into poly (BMA-co-EDMA) monoliths covalently. Because of good dispersibility of MCM-41-MPS in the green solvent-based polymerization system, high permeability and homogeneity for the resultant hybrid monolithic columns was achieved. The MCM-41-MPS grafted monolith was characterized by scanning electron microscopy, energy dispersive spectrometer area scanning, transmission electron microscopy, FT-IR spectra and nitrogen adsorption tests. Chromatographic performance of MCM-41-MPS grafted monolith was characterized by separating small molecules in capillary electrochromatography , including phenol series, naphthyl substitutes, aniline series and alkyl benzenes. The maximum column efficiency of MCM-41-MPS grafted monolith reached 209,000 plates/m, which was twice higher than the corresponding MCM-41-MPS free monolith. Moreover, successful separation of non-steroidal anti-inflammatory drugs and polycyclic aromatic hydrocarbons demonstrated the capacity in broad-spectrum application of the MCM-41-MPS incorporated monolith. The results indicated that green synthesis using room temperature ionic liquid and deep eutectic solvents is an effective method to prepare molecular sieve-incorporated monolithic column.
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JOURNAL OF CHROMATOGRAPHY A
·
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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Analytical Methods
·
2016
·Vol. 8
·期 42
·7587-7596
·
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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JOURNAL OF CHROMATOGRAPHY A
·
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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WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 9
·1-13
·
IF 1.551
Ma Yulin,Gu Na,Gao Jinlong,Wang Kuitao,Wu Yunxia,Meng Xiaoyu
Fe 3 O 4 -CuO@montmorillonite was prepared using coprecipitation method, and its structure was determined by XRD, IR, and transmission electron micrograph (TEM). Montmorillonite in Fe 3 O 4 -CuO@montmorillonite nanocomposite allowed the silicate layer of montmorillonite to behave as a barrier, which prevented the agglomeration and natural crystallization of Fe 3 O 4 and CuO. Furthermore, the chlorine dioxide (ClO 2 ) oxidative degradation of anthracene-contaminated soil was studied in detail using Fe 3 O 4 -CuO@montmorillonite as a magnetic heterogeneous catalyst. The operating parameters such as ClO 2 concentration, catalyst dosage, reaction time, and pH were evaluated. Compared with the conventional ClO 2 oxidation process without the catalyst, the ClO 2 catalytic oxidation system could significantly enhance the degradation efficiency. Under the optimal condition (anthracene concentration 89.8 mg/kg, water soil mass ratio 3:1, initial pH 7, ClO 2 concentration 1 mol/kg, catalyst dosage 1 g/kg, reaction time 30 min, and reaction temperature 25 °C), anthracene degradation efficiency achieved 96.2 %. The catalyst could be easily reused by magnetic separation and used at least 8 cycles without obvious loss of activity. The kinetic studies revealed that the ClO 2 catalytic oxidation degradation of anthracene-contaminated soil with Fe 3 O 4 -CuO@montmorillonite as catalyst followed pseudo-first-order kinetics with respect to ClO 2 concentration. Thus, this study showed potential application of ClO 2 catalytic oxidation process in remediation of organic pollutant-contaminated soil.
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