JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Ying Liu,Runxia Wang,Haiyan Wang,Xijuan Yu,Xien Liu,Peng He,Xilin She,Tianrong Zhan
It is established that ultrathin layered double hydroxide nanosheets (LDHNS) and zeolitic imidazole frameworks (ZIF) are desirable electrochemical sensing modifiers owing to their large surface area and abundant catalytic sites. Integration of them is thus an effective solution to maximize their electrocatalytic activity . Herein, a novel reaction–diffusion framework (RDF) technique is applied for the in situ growth of ZIF-67 on ultrathin CoAl-LDHNS (CoAl-LDHNS@ZIF-67). In a confined space of the agar gel matrix of RDF, the coordination reaction between organic ligands and CoAl-LDHNS without an additional Co 2+ source achieves the controllable growth of ZIF-67 crystals through a long vertical diffusion . The prepared composite comprises both CoAl-LDHNS and ZIF-67 components with a certain ratio and provides a large surface area and amply catalytic sites, thus realizing a rapid transfer of electron and mass. The CoAl-LDHNS@ZIF-67 modified electrode is employed for the simultaneous detection of naphthol isomers by differential pulse voltammetry . Naphthol isomers display anodic reactions with a wide peak potential difference, allowing their simultaneous detection feasible. Voltammetric responses of α-naphthol and β-naphthol follow good linearity against the concentration in a wide range from 0.3 to 150 μM with limits of detection of 54 and 82 nM, respectively. The proposed sensor also demonstrates excellent selectivity , stability, reproducibility, and practicability for the simultaneous detection of naphthol isomers.
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TALANTA
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2021
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IF 6.057
Xin-Qiao He,Yuan-Yuan Cui,Xiao-Hui Lin,Cheng-Xiong Yang
Development of novel functionalized adsorbents for efficient magnetic solid phase extraction (MSPE) is essential for promoting their versatile applications in sample pretreatment. Herein, we report the fabrication of a new polyethyleneimine-600 decorated magnetic microporous organic network nanosphere (Fe 3 O 4 @MON-PEI 600 ) for effective MSPE of trace non-steroidal anti-inflammatory drugs (NSAIDs) from different water samples. The core-shelled Fe 3 O 4 @MON-PEI 600 integrates the synergistic effects of Fe 3 O 4 , MON and PEI 600 , providing facile and effective extraction to NSAIDs via multiple hydrogen bonding , π-π and hydrophobic interactions. The inner MON shell employs π-π and hydrophobic interaction sites and the outer PEI-600 coat acts as the hydrogen bonding doner/receptor, which affords good extraction performance for NSAIDs. Under optimal conditions, the Fe 3 O 4 @MON-PEI 600 -MSPE-HPLC-UV method gives wide linear range (0.14–400 μg L −1 ), low limits of detection (0.042–0.149 μg L −1 ), good precisions (intra-day and inter-day RSDs < 4.5%, n = 6), and large enrichment factors (97.0–98.2). Extraction mechanisms and selectivity of Fe 3 O 4 @MON-PEI 600 are evaluated in detail. Moreover, Fe 3 O 4 @MON-PEI 600 is successfully applied to enrich the trace NSAIDs in different water samples with the concentrations of 0.7 and 0.8 μg L −1 for 1-naphthylacetic acid, 0.5 and 0.1 μg L −1 for naproxen as well as 0.7 μg L −1 for ibuprofen , respectively. The developed method not only affords a novel and efficient magnetic adsorbent for NSAIDs in aqueous media at trace level, but also provides a new strategy for the rational design and synthesis of multiple functionalized MON composites in sample pretreatment.
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Journal of the Iranian Chemical Society
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2020
·Vol. 17
·期 8
·2095-2103
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IF 1.552
Cao Jiangping,Xie Qilong,Liang Yongfeng,Di Hongwei,Yi Zonghui,Ma Gui,Zhang Ping
Abstract A rapid and simultaneous method for the determination of naphthol isomers in human urine has been developed and validated by using molecular complex-based dispersive liquid–liquid microextraction followed by high-performance liquid chromatography. This method worked by the formation of hydrogen bond interaction between the extractant (1-octanol, Lewis base) and the analytes (naphthols, Lewis acid). Experimental parameters, including the type and volume of the extractant and disperser, pH, addition of salt, extraction time, were examined and optimized. Additionally, the proposed method was applied to human urine samples collected from six volunteer donors of the chemical laboratory. Under the optimum conditions, average recovery rates for the real samples varied from 78.5 to 98.2%, with the relative standard deviations less than 7.6%. The method offered excellent linearity over a range of 5–5000 ng/mL with correlation coefficient ( r < 0.999). The detection limit ( S / N = 3) was 0.61–0.69 ng/mL. The developed method was successfully applied to the determination of naphthol isomers in human urine. Compared with the previous DLLME methods, the feature of the new procedure lies in simpler sample preparation, higher sensitivity and lower cost of the extraction device. Also, theoretical calculations were conducted to understand the molecular interaction mechanism between 1-octanol and naphthols. Graphic abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Huanfang Zhou,Limin Chen,Shuting Li,Songqing Huang,Yingying Sun,Yanhong Chen,Zhao Wang,Wei Liu,Xinchun Li
A facile and green method for preparation of gold/palladium (Au/Pd) bimetallic nanoparticles interleaved reduced graphene oxide (rGO) composite was presented. One-step electroreduction of Au/Pd precursors and graphene oxide synergistically produced a multilayered and well-structured nanohybrid on glassy carbon electrode, which was explored as a highly efficient electrocatalyst . This operation is easy and controllable, as compared with time-consuming and procedure-tedious hydrothermal synthesis . The morphology and chemical constituents were meticulously characterized. The remarkable electrocatalytic performance of the prepared nanohybrid was demonstrated by detection of a high-risk carcinogen pollutant, hydrazine. By optimizing the preparation condition and investigating the electrochemical behavior, we achieved the sensitive analysis of hydrazine with ultralow oxidation overpotential. Amperometry was employed for constructing the quantitative calibration curve ; the steady-state current originating from hydrazine oxidation was proportional to the analytical concentration ranging from 0.1 μM to 200 μM, with the detection limit of 16 nM. Moreover, the nanohybrid displayed considerable anti-interfering ability with respect to hydrazine detection, as a variety of potentially coexisting substances produced negligible electrochemical response in the given analytical condition. Advantages including easy-to-preparation, high sensitivity and favorable selectivity , as well as broad linear response make the present method feasible for monitoring of hydrazine in water environment.
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JOURNAL OF CHROMATOGRAPHY A
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2020
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IF 4.049
Luping Sun,Shuyun Zhu,Zhenjia Zheng,Jing Sun,Xian-En Zhao,Huwei Liu
Hydroxyl-polycyclic aromatic hydrocarbons (OH-PAHs) are biomarkers for assessing the exposure levels of polycyclic aromatic hydrocarbons (PAHs). A series of stable isotope mass tags (SIMT-332/338/346/349/351/354/360/363/374/377) were firstly designed and synthesized to perform multiplexed stable isotope labeling derivatization (MSILD) of OH-PAHs in human plasma and urine. Their derivatives were enriched and purified by magnetic dispersive solid phase extraction (MDSPE) using prepared Fe 3 O 4 /GO and then determined by ultra high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) in multiple reaction monitoring mode. 9-Plexed MSILD reagents were prepared using pipemidic acid as core structure with different isotope mass tags, in which carbonyl chloride group was used to label OH-PAHs. The SIMT-346 labeled OH-PAHs standards were used as internal standards, which can greatly increase the quantitative accuracy. 9-Plex labeled nine different real samples can be quantified by UHPLC-MS/MS in a single run. Under optimized MSILD-MDSPE conditions, good linearities of seven OH-PAHs were obtained with satisfactory coefficient of determination R 2 > 0.991. Limits of detection (LODs) of seven OH-PAHs were from 0.1 to 0.5 pg/mL, and limits of quantitation (LOQs) ranged from 0.5 to 2.0 pg/mL. The intra- and inter-day precisions ranged in 2.3–12.4% with accuracies in the range of 91.7–108.4%. Acceptable results of matrix effect (89.7–105.7%) and derivatization efficiency (> 96.4%) were obtained. In short, the developed method has been proved to be high-throughput, sensitive, accurate and easy-handling. This method was applied for the measurement of seven free OH-PAHs in human urine and plasma, and expected to provide technical support for the evaluation of PAHs exposure levels in humans.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 7
·2890-2896
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IF 3.288
Yinhui Yang,Meiling Qi,Jinliang Wang
Here we report a novel hexaphenylbenzene (HPB)-based material functionalized with six tetraphenylethylene units (BPT) with unique conformation-driven selectivity for gas chromatographic (GC) separations. It is composed of a neat aromatic hydrocarbon with a rigid propeller-like conformation. As a result, the BPT capillary column exhibited high column efficiency of 5340 plates per m and high-resolution capability for aromatic to aliphatic isomers with excellent intra-day and inter-day repeatability and between-column reproducibility. The results demonstrate the unique conformation-driven selectivity of the HPB-based stationary phase, which is rarely reported for chromatography. Moreover, its application in the determination of isomer impurities in commercial products proved its good potential for practical GC analysis. This work presents a new perspective for developing selective stationary phases by engineering their structures.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Xin-Qiao He,Yuan-Yuan Cui,Cheng-Xiong Yang
The lack of functional groups or binding sites largely hindered the broad application of microporous organic networks (MONs). Herein, we report the fabrication of the sulfonate group-enriched magnetic MON composite (MMON-SO3H@SO3Na) via the combination of the sulfonic acid group containing the monomer and thiol–yne click postmodification for efficient magnetic solid-phase extraction (MSPE) of benzimidazole fungicides (BZDs) from complex sample matrices. The well-defined core–shell-structured MMON-SO3H@SO3Na was obtained and served as an advanced adsorbent for MSPE for concentrating and monitoring trace BZDs. The MMON-SO3H@SO3Na with numerous sulfonate groups provides plenty of ion-exchange, hydrogen-bonding, and π–π sites, leading to the favorable affinity to BZDs via multiple interaction mechanisms. The MMON-SO3H@SO3Na-based MSPE–high-performance liquid chromatography method afforded a wide linear range, low limits of detection, large enrichment factors, good precisions, and reusability for BZDs. Trace BZDs in complex vegetables and fruit samples were successfully detected by the established method. The MMON-SO3H@SO3Na also exhibited good selectivity toward multiple types of polar contaminants containing hydrogen-bonding sites and aromatic structures. This work provided a new postsynthesis strategy for constructing novel and multifunctioned magnetic MONs for preconcentration of trace analytes in a complex matrix.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Yizhou Tu,Guizhou Xu,Lu Jiang,Xuejiao Hu,Jun Xu,Xianchuan Xie,Aimin Li
Amphiphilic hyper-crosslinked porous cyclodextrin polymer (PBCD-B-D) with a surface area of 1445 m 2 g −1 was synthesized for rapid removal of organic micropollutants. Partially benzylated cyclodextrin was crosslinked with 4,4′-bis(chloromethyl)-1,1′-biphenyl and α,α'-dichloro-p-xylene by the Friedel–Crafts alkylation reaction. The hydrophilicity of the PBCD-B-D surface is modulated by controlling the number of hydroxyl groups on cyclodextrin. Benzylation reaction is more likely to occur at the C-2 and C-6 positions of cyclodextrin hydroxyl groups according to Gaussian computation. Four different water-soluble pollutants (3-phenylphenol, 2-naphthol, p-nitrophenol, and 4-chlorophenol) were selected for adsorption study. The adsorption rate of PBCD-B-D is extremely high, and the removal efficiency reaches above 95% in 1 min. For the adsorption of 3-phenylphenol and 2-naphthol, the rate constants of PBCD-B-D are 827–1187 and 396–413 times larger than those of granular activated carbon (GAC) and β-cyclodextrin polymer crosslinked with epichlorohydrin (EPI-CDP), respectively. The adsorption capacity of PBCD-B-D is 2 and 4 times higher than that of GAC and EPI-CDP, respectively. The combination of cyclodextrin inclusion mechanism, hydrophobic attraction, and hydrogen bonding allows PBCD-B-D to adsorb both hydrophobic and hydrophilic pollutants. PBCD-B-D can be easily regenerated at room temperature using methanol as eluent. In addition, PBCD-B-D showed excellent adsorption performance towards mixed pollutants at environmentally relevant concentrations. According to the thermodynamic study, the adsorption of organic compounds onto PBCD-B-D belongs to physical adsorption and is spontaneous. PBCD-B-D is a potential novel adsorbent for water treatment owing to its excellent adsorption performance, low cost, and good regenerability.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
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IF 5.589
Shanshan Sun,Haizhen Wang,Binxin Fu,Hao Zhang,Jun Lou,Laosheng Wu,Jianming Xu
Rhodococcus sp. WB9, a strain isolated from polycyclic aromatic hydrocarbons contaminated soil, degraded phenanthrene (PHE, 100 mg L −1 ) completely within 4 days. 18 metabolites were identified during PHE degradation, including 5 different hydroxyphenanthrene compounds resulted from multiple routes of initial monooxygenase attack. Initial dioxygenation dominantly occurred on 3,4-C positions, followed by meta -cleavage to form 1-hydroxy-2-naphthoic acid (1H2N). More than 95.2% of 1H2N was transported to and kept in extracellular solution without further degradation. However, intracellular 1H2N was converted to 1,2-naphthalenediol that was branched to produce salicylate and phthalate. Furthermore, 131 genes in strain WB9 genome were related to aromatic hydrocarbons catabolism, including the gene coding for salicylate 1-monooxygenase that catalyzed the oxidation of 1H2N to 1,2-naphthalenediol, and complete gene sets for the transformation of salicylate and phthalate toward tricarboxylic acid (TCA) cycle. Metabolic and genomic analyses reveal that strain WB9 has the ability to metabolize intracellular 1H2N to TCA cycle intermediates, but the extracellular 1H2N can’t enter the cells, restricting 1H2N bioavailability and PHE mineralization.
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Canadian Journal of Chemistry
·
2019
·Vol. 97
·期 4
·
IF 1.252
Jun Wang,Junyi Xie,Libo Wang,Yan Jiang,Na Zhang
A salen nickel complex has been prepared in good yield with ethylenediamine, salicylaldehyde, and NiCl2·6H2O as raw materials. The structure of the complex was characterized by FTIR, 1H NMR, UV, and ESI-MS. Upon activation with methylaluminoxane (MAO), the precatalyst showed high activity for ethylene oligomerization. To reduce the simultaneous production of insoluble polymers during the nickel-catalyzed ethylene oligomerization, a series of phenolic compounds were introduced as modifiers for the production of linear α-olefins. The researched result showed that the phenolic compounds have a significant impact on the selectivity of oligomers and the concentration of polymers. With the increase of phenolic compounds, the content of polymers decreased and the distribution of oligomers gradually shifted toward lighter olefins. The sterically hindered 4-tert-butyphenol proved to be an especially efficient polymer-retarding modifier among the studied phenolic compounds in this work. Furthermore, the retarding effect of phenolic compounds toward insoluble polymers may be mainly related to their interaction with MAO, giving rise to larger MAO aggregates.
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JOURNAL OF SEPARATION SCIENCE
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2019
·Vol. 42
·期 20
·3234-3242
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IF 2.516
Zi-Ling Li,Na Li,Li Du,Ya-Hui Wang,Bo Fang,Man-Man Wang,Qian Wang
The biomonitoring of hydroxy polycyclic aromatic hydrocarbons in urine, as a direct way to access multiple exposures to polycyclic aromatic hydrocarbons, has raised great concerns due to their increasing hazardous health effects on humans. Solid-phase extraction is an effective and useful technique to preconcentrate trace analytes from biological samples. Here, we report a novel solid-phase extraction method using a graphene oxide incorporated monolithic syringe for the determination of six hydroxy polycyclic aromatic hydrocarbons in urine coupled with liquid chromatography-tandem mass spectrometry. The effect of graphene oxide amount, washing solvent, eluting solvent, and its volume on the extraction performance were investigated. The fabricated monoliths gave higher adsorption efficiency and capacity than the neat polymer monolith and commercial C 18 sorbent. Under the optimum conditions, the developed method provided the detection limits ( S/N = 3) of 0.02–0.1 ng/mL and the linear ranges of 0.1–1500 ng/mL for six analytes in urine sample. The recoveries at three spiked levels ranged from 77.5 to 97.1%. Besides, the intra column-to-column ( n = 3) and inter batch-to-batch ( n = 3) precisions were ≤ 9.8%. The developed method was successfully applied for the determination of hydroxy polycyclic aromatic hydrocarbons in urine samples of coke oven workers.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jie-Ping Fan,Jun-Jing Luo,Xue-Hong Zhang,Bing Zhen,Chun-Yi Dong,Yan-Chen Li,Jian Shen,Yu-Tong Cheng,Hui-Ping Chen
In this work, a novel electrospun β-cyclodextrin (β-CD)/chitosan (CS)/polyvinyl alcohol (PVA) nanofiber membrane was prepared to simultaneously and rapidly remove organic and heavy metal micropollutants. The preparation conditions were optimized by multi-objective response surface methodology, and obtained as follows: 100% of the amount of β-CD (relative to PVA), 49.49% of the amount of CS (relative to PVA), 20 cm of the distance between the needle tip and the collector drum, 0.23 mL h −1 of the flow rate of the spinning solution, and 8.72% of the amount of PVA (relative to water). The characterization by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) showed a well cross-linked β-CD/CS/PVA nanofiber membrane was formed. In the static and dynamic adsorption experiments, the results demonstrated that the β-CD/CS/PVA nanofiber membrane was highly efficient in simultaneous and rapid removal of organic and heavy metal micropollutants in water treatment process.
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