MATERIALS CHEMISTRY AND PHYSICS
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2021
·
IF 4.094
Lijing Chang,Yanjun Hou,Ju Bai,Haoran Xu,Yuhang Zhang,Shoulei Miao,Cheng Wang
Two electrochromic polymers containing triphenylamine groups with memory storage function were synthesized. The structures of the polymers have been characterized in detail. The polymers had good solubilities, excellent thermal stabilities and high fluorescence intensities. The reversible redox peak can also be clearly observed in the cyclic voltammogram, and the electrochromic color contrast was obvious. In addition, the polymers can also be used as memory storage materials with excellent "write-read-erase-rewrite" performance. Among them, the P2 film presented noticeable color changed from light yellow to pine green during the voltage 0 V–1.4 V, the coloring time was 3.3 s and the bleaching time was 3.7 s, the coloration efficiency was 207 cm 2 C −1 . The ON/OFF current ratio of P2 was 10 3.1 and the threshold voltage of P2 was 0.91 V. The results showed that these polymers have broad application prospects in the field of dual-function materials.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2021
·
IF 6.291
Peipei Zhou,Rui Wang,Ru Fan,Xiaoran Yang,He Mei,Huaiyu Chen,Huili Wang,Zhenfeng Wang,Xuedong Wang
Herein, a kind of novel multi-layer core-shell nanocomposites (NSPN) was prepared by employing SiO 2 and polyvinylpyrrolidone (PVP) polymers as modifiers and amino-functionalized metal-organic frameworks (NH 2 -MIL101(Fe)) as coating. It was referred to as the NSPN and ILs-based effervescence-assisted dispersive solid-phase microextraction, hereafter abbreviated as NIE-DSM. In terms of extraction efficiency, SiO 2 and PVP as modifiers and NH 2 -MIL(Fe) as coating onto the surface of NiFe 2 O 4 cores played a synergistically enhancing effect on adsorption/extraction. Effervescent tablets were prepared by integrating the NSPN magnetic nanoparticles as adsorbents with imidazolium-based ionic liquids (ILs) as extractants as well as acidic and alkaline sources. Under vigorous dispersion of CO 2 bubbles, the NIE-DSM method realized the goal of rapidly diffusing and separating the adsorbent/extractant (~3 min) without needing conventional vortexing or centrifugation step. Consequently, the NIE-DSM approach combined dispersion and adsorption/extractant in a synchronous way. Under optimized conditions, the NIE-DSM/HPLC-FLD method gave low limits of detection (0.008–0.034 μg kg −1 ) and satisfactory extraction recoveries (74.1–101.6%) for five polycyclic aromatic hydrocarbons (PAHs; fluorene, anthracene, pyrene, chrysene and benzo(a)pyrene) in milk samples. The intra-day and inter-day precision, expressed as relative standard deviations, was < 5.9% and 6.5%, respectively, demonstrating a high precision. Owing to no requirement for electrical power, this method shows great potential for outdoor monitoring of trace-level PAHs in food matrices.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Weihua Liu,Juntao Wang,Shuangju Song,Lin Hao,Jiajia Liu,Yangjuan An,Yaxing Guo,Qiuhua Wu,Chun Wang,Zhi Wang
A uniform spherical structure covalent organic framework (TAPA-BPDA-COF) was prepared by a facile method at room temperature with tris(4-aminophenyl)amine (TAPA) and 4,4′-biphenyldicarboxaldehyde (BPDA) as building blocks. Based on the solid phase extraction with the TAPA-BPDA-COF as the sorbent and high performance liquid chromatography-diode array detection, a sensitive analytical method was established for the determination of four neonicotinoid insecticides from water and honey samples. Under the optimum conditions, good linear response for the quantification of the analytes was achieved in the range of 0.3–50.0 ng mL −1 for water samples and in the range of 8.0–500.0 ng g −1 for honey samples. The method recoveries fell in the range of 80.0–121.9% with RSDs less than 7.6%. The limits of detection at the signal to noise ratio of 3 were measured to be in the range of 0.08–0.12 ng mL −1 for water samples and 2.6–3.3 ng g −1 for honey samples, depending on compounds.
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CURRENT MICROBIOLOGY
·
2021
·Vol. 78
·期 12
·4084-4097
·
IF 2.188
Ahmad Manzoor,Ling Juan,Yang Qingsong,Sajjad Wasim,Zhou Weiguo,Yin Jianping,Dong Junde
Seagrass meadows constitute a prestigious ecosystem in the marine environment, providing valuable ecological and commercial services. Among the various causes, pollutions are considered one of the significant reasons for seagrass decline globally. This study investigates the impacts of polycyclic aromatic hydrocarbons mixture (pyrene, phenanthrene, and fluorene) on bacterial communities in Halophila ovalis sediments. The seagrass sediment bacterial microbiome was evaluated in a batch culture experiment by Illumina MiSeq sequencing. Culture-able bacterial strains were isolated and characterized by 16S rRNA gene sequencing. The results demonstrated an excellent alpha diversity in the original sediments with a Shannon index of (8.078) compared to the subsequent control group (5.908) and PAH-treated group (PAH-T) (4.916). Three phyla, Proteobacteria , Firmicutes, and Bacteroidetes, were detected in high abundance in the control and PAH-T groups. However, a significant difference ( P < 0.05) was observed at the genus level between control and PAH-T group bacterial consortia. Pseudomonas, Mycobacterium, Idiomarina, Hydrogenophaga, Alteromonas, Sphingobacterium, and several others were highly abundant in PAH-T groups. Most of the culture-able isolates recovered in this study showed the closest resemblance to previously identified hydrocarbon-degrading bacteria. Among the three strains, Mix-16 ( Citricoccus yambaruensis ) and Mix-20 ( Gordonia rubripertincta ) showed a higher degradation of PAHs than Mix-19 ( Isoptericola halotolerans ) in the monoculture experiment. The most increased degradation of PAHs was recorded in the co-culture experiment. The present work revealed that PAHs could act as environmental stress and can influence bacterial community succession. Moreover, the co-culture strategy significantly enhanced the biodegradation of PAHs.
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LANGMUIR
·
2019
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IF 3.683
Qiong Ma,Yingying Zhang,Xueping Dang,Jianlin Huang,Youhong Ai,Huaixia Chen
In this work, adsorption behaviors of pyrene (PYR), fluoranthene (FLT), phenanthrene (PHE), and fluorene (FLU) on the coordination cluster [Zn5(H2Ln)6](NO3)4]·8H2O·2CH3OH (Zn5) were studied. The adsorption mechanism and spectrum analyses revealed that the synergistic effect of hydrophobic interaction, π–π stacking, and N–H···π interaction played a crucial role during the adsorption process. The maximum adsorption capacities of PYR, FLT, PHE, and FLU were 406.4, 399.7, 153.7, and 114.3 mg g–1, respectively, resulting from the Langmuir isotherm model. Quick removal of PYR and FLT was found in kinetic experiments with the adsorption equilibrium being reached within 1 min. Competitive adsorption indicated that the adsorption sites for PYR, FLT, PHE, and FLU on Zn5 were identical, and synergistic effects also existed in the adsorption process. Therefore, Zn5 has the potential to be used as an adsorbent in the field of wastewater treatment.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 49
·1905576
·
IF 15.621
Dan Han,Dongya Ni,Qing Zhou,Jingjing Ji,Yanqin Lv,Yanfei Shen,Songqin Liu,Yuanjian Zhang
Rapid screening of polycyclic aromatic hydrocarbons (PAHs), a large class of toxic and carcinogenic compounds, is highly desirable for environmental and food safety. In principle, a photoluminescent (PL) assay is a potential route, but demands highly efficient and stable, low cost, and environment-friendly photoactive materials. 2D carbon nitride nanosheets (CNNS) that have triggered increasing interest may meet all these requirements. However, conventional applications of CNNS are restricted in aqueous solution, in which the long-term dispersibility is difficult to be addressed. Here, the harnessing of unique PL properties of CNNS is reported by dispersing them in a hierarchical polymeric matrix, driven by electrostatic interactions. Such a configuration not only enables a solid-state host to perpetually maintain homogeneous dispersibility of CNNS but also processes free channels for sufficient mass transfer. Moreover, the nanohybrid inherits the unique PL properties of CNNS. Further using β-CD as the molecular recognition unit, an economic, highly selective and sensitive paper-based PL sensor for PAHs is constructed via an inner-filter effect. This work opens a new avenue in harnessing unique PL properties of CNNS in solid state with superior stability for a variety of potential sensing applications, especially for point-of-care testing and/or in developing countries.
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JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Xiaolan Wang,Xufeng Meng,Qiuhua Wu,Chun Wang,Zhi Wang
A solid phase extraction (SPE) method with a porous organic polymer as adsorbent was established for the extraction of five carbamate pesticides (metolcarb, carbaryl, isoprocarb, bassa and diethofencarb) from milk, white wine and juice samples prior to high performance liquid chromatography-diode array detection. The main factors affecting the SPE were optimized, including sample volume, sample loading rate, sample solution pH, desorption conditions and cartridge reusability. Under the optimal conditions, a good linearity existed in the range from 1.0 to 320.0 ng mL −1 for milk and white wine samples and from 0.5 to 160.0 ng mL −1 for juice sample with the correlation coefficients between 0.9956 and 0.9998. The method recoveries of the carbamates were 82.0%–110.0%. The limits of detection were 0.12-0.40 ng mL -1 for milk and white wine samples, and 0.06-0.20 ng mL −1 for juice sample. The adsorption mechanism of the adsorbent was investigated by the extraction of different types of organic compounds (carbamates, benzoylurea insecticides, endocrine disrupting chemicals and polycyclic aromatic hydrocarbons) with the adsorbent. The results showed that the existence of the hydrogen-bonding between the adsorbent and the analytes is favorable for the adsorption and strong hydrophobicity seems to have an adverse effect.
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Nanoscale
·
2019
·Vol. 11
·期 14
·6610-6619
·
IF 6.97
Xiaojun He,Xiaoyu Xie,Jingxian Wang,Xiufang Ma,Yuanyang Xie,Jing Gu,Nan Xiao,Jieshan Qiu
It is a big challenge to synthesize ultrathin carbon nanonets with an enhanced charge transfer capability for high-performance energy storage devices. Herein, ultrathin carbon nanonets (UCNs) were successfully synthesized for the first time from fluorene, a typical aromatic molecule, by a template strategy for supercapacitors. The formation mechanism of UCNs was determined using Density Functional Theory and Materials Studio, in which the fluorene-derived radicals were assembled into UCNs in the template-confinement space with the assistance of KOH. The as-made UCNs feature interconnected high-conductivity net-like architectures with enhanced charge transfer capability, evidenced by their high capacitance, excellent rate performance and cycling stability for symmetrical supercapacitors in a KOH electrolyte. This finding may provide a significant step forward in understanding the formation mechanism of graphene-like materials from more complicated aromatic hydrocarbon molecules, and our work may draw wide attention in the fields of aromatic chemistry and carbon-based energy storage materials.
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JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Zi-Yuan Zhao,Lei Qin,Xu-Hui Huang,Yu-Ying Zhang,Ming Du,Xian-Bing Xu,Da-Yong Zhou,Bei-Wei Zhu
The coated direct inlet probe (CDIP) is a new laboratory-made low-cost technology developed from a direct inlet probe (DIP), which has the advantage of quick enrichment/cleanup of an analyte from liquid samples. A capillary probe is coated with hydroxy-terminated polydimethylsiloxane (OH-PDMS), divinylbenzene (DVB), and β-cyclodextrin (β-CD) by a sol-gel method. This probe can be directly coupled with a commercialized atmospheric-pressure chemical ionization (APCI) ion source and high-resolution mass spectrometry, which are widely applicable, reliable, and durable. The ability to perform quantitative analyses with the use of a stable-isotope-labeled internal standard (SIL-IS) was tested by using different concentrations of acenaphthylene (ACY), acenaphthene (ACP), fluorene (FLR), fluoranthene (FLT), phenanthrene (PHE), and benzo[a]pyrene (B[a]P). Calibration curves with a coefficient of determination of R 2 ≥ 0.9982 for different polycyclic aromatic hydrocarbons (PAHs) were obtained. A limit of detection (LOD) of 0.008–0.04 ng mL −1 for PAHs was determined. The entire workflow is solvent-free and can be completed in less than 5 min, which demonstrates the advantages of this technique for quantitative analysis.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Xiaofei Han,Jia Chen,Zhan Li,Hongdeng Qiu
Based on a one-step combustion fabrication approach, a novel magnetic porous carbon (MPC) was fabricated using filter paper as porous carbon source and iron salts as magnetic precursors. The textural properties of the MPC were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), vibration sample magnetometer (VSM) and nitrogen absorption-desorption isotherms. The as-prepared MPC possessed a high specific surface area, a microstructure comprised of mesopores and strong magnetic response. It was employed as a magnetic solid-phase extraction (MSPE) adsorbent for the determination of three non-steroidal anti-inflammatory drugs (NSAIDs) in environmental water and biological samples coupled with high performance liquid chromatography (HPLC). The main parameters affecting extraction efficiency were investigated in detail and a satisfactory performance was obtained under the optimal conditions. The calibration curves were linear over the concentration ranging from 1 to 1200 μg L −1 for ketoprofen (KET) and 2–1200 μg L −1 for naproxen (NAP) and diclofenac (DCF) with determination coefficients (R 2 ) between 0.9995 and 0.9997. The limits of detection (LODs) were in the range of 0.2–0.4 μg L −1 . The intra- and inter-day relative standard deviations (RSDs) were less than 4.03% and 8.72%, respectively. The recoveries ranged from 84.67% to 113.73% with RSDs less than 7.76%. The satisfactory results confirmed the great potential of the novel MPC adsorbent for the extraction of NSAIDs from complex sample matrices.
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JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Ning Zhang,Lishen Su,Suning Man,Xiaoyun Lei,Ting Huang,Chunling Zhu,Lan Zhang,Xiaoping Wu
A direct immersion solid-phase microextraction (DI-SPME) approach for gas chromatography-mass spectrometry (GC–MS) based on hybrid fiber coating of ionic liquid and polyhedral oligomeric silsesquioxane (POSS) is presented. To fabricate the task-specific coating for the enrichment of polycyclic aromatic hydrocarbons (PAHs), 1-butyl-3-vinylimidazolium bis[(trifluoromethyl)sulfonyl]imide (IL) and POSS were rapidly photoinitiated copolymerized within 5 min on a stainless steel fiber. The high efficient extraction of target analytes can be attributed to a combined result of multiple interactions including the strong C F⋯H C pseudohydrogen bonding, π-π stacking, hydrophobic force, and molecular sieve effect. A wide linear range (0.04–400 ng L −1 ) with low detection limits in the range of 0.004 and 0.5 ng L −1 were obtained for PAHs by GC–MS. The applicability of this coupling method was successfully demonstrated by the analysis of trace PAHs in real river water and soil samples, with satisfied recoveries (84.2–108.6%) and relative standard deviations (<8.1%). Compared to the other commercial fiber-based SPME methods, the IL/POSS hybrid coating-based SPME is much cheaper, thermally stable and capable of eliminating possible deleterious effects as well.
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JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 43
·期 3
·622-630
·
IF 2.516
Chunying Li,Min Sun,Xiangping Ji,Sen Han,Jiaqing Feng,Wenjuan Guo,Juanjuan Feng
Triazine-based organic polymers@SiO 2 nanospheres were prepared and applied as an extraction coating onto stainless steel wires and the wires were filled into polyetheretherketone tube for in-tube solid-phase microextraction. Taking polycyclic aromatic hydrocarbons as targets, main factors affecting extraction performance of the tube were investigated through coupling to high performance liquid chromatography. Under the optimum conditions, an online analytical method for polycyclic aromatic hydrocarbons was established with large linear ranges (0.010-20 µg/L), low limits of detection (0.003-0.010 µg/L), high enrichment factors (533-2954), and good repeatability (relative standard deviations <1.7% for intraday test, <5.0% for interday test). The analysis method was successfully applied to the detection of trace targets in real water samples and the relative recoveries ranged from 82.9 to 119.9%, which demonstrated the applicability of extraction tube in sample preparation.
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