Journal of Materials Chemistry C
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2019
·Vol. 7
·期 16
·4667-4672
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IF 6.641
Shuxiang Ding,Chunxue Wang,Xiaoyu Shi,Jiawei Zou,Qiuli Cheng,Jiufu Zhu,Zuosen Shi,Zhenzhen Cai,Changming Chen,Zhanchen Cui
A series of acrylate group terminated fluorinated polycarbonates containing 4,4-cyclohexylidenebis phenol (BPZ) (AF-Z-PC MAs) or dodecyl chains (AF-Ali-PC MAs) were synthesized. These polymers were further doped with chromophores and crosslinked under a UV lamp. With these doped polymers as the functional layer, we successfully obtained straight and Y structure waveguides by a direct writing method for electro-optical modulator devices. These cross-linked polymers displayed good thermal stability, low optical loss and a high refractive index. In addition, after polarization, the electrooptic coefficients r33 of the doped films were 10 pm V−1 and 9 pm V−1, measured by the Teng–Man method, respectively. The results showed that the direct writing method was a simple and effective way to fabricate Mach–Zehnder structure waveguides and these new macroacrylate terminated polycarbonates had great potential in the application of electro-optical modulator devices.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Xiaolin Zhu,Guanlan Wu,Yi Xing,Chengzhi Wang,Xing Yuan,Baikun Li
Bisphenol analogues have been developed as alternatives to bisphenol A (BPA), a common chemical with potential adverse effects on human health. It is imperative to perform a fast and sensitive evaluation for the toxicity of these bisphenol analogues. This study introduces a label-free electrochemical biosensor based on a screen-printed electrode modified with the carboxylated multi-walled carbon nanotube/rhodamine B/gold nanoparticle. Ctenopharyngodon idella kidney (CIK) cells were used as the biological recognition agent to detect changes in electrochemical signals and indicate the cell viability. Only 20 μL of sample was required for detection, which was much lower than that of other conventional electrochemical methods (≥ 1 mL). This biosensor was examined for the cytotoxicity of BPA, bisphenol AF (BPAF), bisphenol B (BPB), bisphenol F (BPF), and bisphenol S (BPS) to CIK cells. The half inhibition concentration (IC 50 ) values after 48 h of exposure indicated that the rank order of cytotoxicities was BPAF > BPB > BPA > BPF > BPS. The morphological changes in CIK cells after treatment with various bisphenols were investigated, and the combined toxicities of the binary bisphenol mixtures were determined. Potentially synergistic and additive effects were observed. These findings provide new insights into the cytotoxicity of bisphenol analogues.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Guoliang Li,Xiaobing Zhang,Jianqiang Sun,Anping Zhang,Chunyang Liao
A novel unique adsorbent (Fe 3 O 4 @Co/Ni-LDH) has been successfully synthesized and applied for removal of bisphenols (BPs) from aqueous solution. The prepared adsorbent was characterized to appear in a hierarchical rattle-like structure, and possesses high specific surface area, abundant pore system, and magnetic properties. Adsorption kinetics fitted well with the pseudo-second-order model. Adsorption isotherms abide by the Langmuir model, and the maximum adsorption capacity for bisphenol A (BPA), F (BPF), AF (BPAF) and S (BPS) on Fe 3 O 4 @Co/Ni-LDH at pH of 7.0 were 238.96, 177.09, 320.56 and 345.84 mg/g, respectively. Moreover, it was found that the high pH and NaCl concentration were not conducive to the removal of BPs. The humic acid and real waters had no significant effects on the removal of BPs on Fe 3 O 4 @Co/Ni-LDH. Furthermore, the FT-IR spectra indicated that the removal of four BPs were primarily Hydrogen bond interaction between BPs and Fe 3 O 4 @Co/Ni-LDH. The Fe 3 O 4 @Co/Ni-LDH was regenerated effectively by methanol and can be repeatedly used. This novel Fe 3 O 4 @Co/Ni-LDH can be applied as a promising adsorbent for removal of BPs from aqueous matrices.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
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IF 4.527
Dezhi Yang,Yingdong Wang,Jianbo Peng,Chun Xun,Yaling Yang
A simple, effective and convenient method for determination of phenolic compounds by acid-base induced deep eutectic solvents (DESs) microextraction was developed. The binary and ternary DESs were prepared by a range of fatty acids (C 8 -C 12 ), which can act as hydrogen bond donors and hydrogen bond acceptors simultaneously. The gas-assisted mixing customization provides excellent mixing performance and concentration efficiency through the bubble adsorption mechanism for the handling of large-volume aqueous sample. In extraction process, NH 3 ·H 2 O can act as the emulsifier agent and reacted with DESs to form salts with a cloudy solution, which can obviously improve the extraction efficiency. HCl can act as the phase separation agent, and there is no need to centrifuge, which increases the efficiency of analysis procedure. The factors affected on extraction efficiency were carefully optimized. At optimum conditions and molar ratio of C 8 :C 9 :C 12 (3:2:1), the limit of detections (LODs), the preconcentration factor, the repeatability (RSDs%) were in the range of 0.22–0.53 μg L −1 , 235–244, and 2.6–6.7%, respectively. Finally, the proposed method was applied to analyze four phenolic compounds in real water samples and the recoveries were between 87.4% and 106.6%.
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JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Junbin Liao,Xinyan Yu,Quan Chen,Xing Gao,Huimin Ruan,Jiangnan Shen,Congjie Gao
Ion-conductive polymers having highly ordered and well-defined phase-separated structures are potential materials for use as monovalent anion-selective membranes (MASMs). In this work, to investigate the effect of hydrophobic spacers, four side-chain-type imidazolium salt-tethered poly(arylene ether sulfone) anion-exchange membranes (AEMs) with different alkyl spacer lengths (–CH 2 – number: 3, 6, 9, and 12) were fabricated for use in electrodialysis (ED). Our investigations using atomic force microscopy , small angle X-ray scattering and X-ray diffraction demonstrate that the extended alkyl spacers change the nano-phase-separated structures, with an increased ion cluster space ranging from 3.29 nm to 7.76 nm, resulting from increased immiscibility between the additional hydrophobic alkyl spacers and (i) the hydrophobic aromatic backbones and (ii) the hydrophilic ion-conductive groups. In addition, with the extension of the alkyl spacer, chloride (Cl − ) ion conductivity at 25 °C decreases from 16.4 mS cm −1 to 11.4 mS cm −1 and water uptake is reduced to 12.8% (20 °C). It is found that the as-prepared AEM with a hexyl alkyl spacer shows the superior perm-selectivity (Cl − /SO 4 2− ) of 7.10 (separation efficiency: 70.3%), as compared with three others (3.48, 6.81, and 4.26). This work thus presents an efficient strategy to guide the architectural design of novel MASMs.
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Polymers
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2019
·Vol. 11
·期 9
·1403
·
IF 3.164
Lifen Tong,Xiting Lei,Guangyao Yang,Xiaobo Liu
A novel poly(arylene ether nitrile) terminated with hydroxyl groups (PEN–OH) was synthesized successfully. The effects of heat-treatment temperature on the thermal properties, mechanical properties, and dielectric properties of the PEN–OH films were studied in detail. Due to the cross-linking reaction occurring, at high temperature, among the nitrile groups on the side of the PEN–OH main chain to form a structurally stable triazine ring, the structure of materials changes from a linear structure to a bulk structure. Thus, the thermal properties and mechanical properties were improved. In addition, the occurrence of cross-linking reactions can reduce the polar groups in the material, leading to the decrease of dielectric constant. As the heat-treatment temperature increased, the glass-transition temperature increased from 180.6 °C to 203.6 °C, and the dielectric constant decreased from 3.4 to 2.8 at 1 MHz. Proper temperature heat-treatment could improve the tensile strength, as well as the elongation, at the break of the PEN–OH films. Moreover, because of the excellent adhesive property of PEN–OH to copper foil, a double-layer flexible copper clad laminate (FCCL) without any adhesives based on PEN–OH was prepared by a simple hot-press method, which possessed high peel strength with 1.01 N/mm. Therefore, the PEN–OH has potential applications in the electronic field.Keywords:low dielectric constant;poly(arylene ether nitrile);thermal properties;self-toughening;self-enhancement
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FOOD CHEMISTRY
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2018
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IF 4.946
Dezhi Yang,Guixiang Li,Lan Wu,Yaling Yang
A novel liquid-phase microextraction based on the ferrofluid was successfully applied for the extraction and determination of four phenolic compounds (bisphenol-A, bisphenol-AF, tetrabromobisphenol-A and 4-tert-octylphenol) in milks and fruit juices. In this study, a range of alkyl (C 4 –C 10 ) alcohols as the carrier liquid were used for the preparation of ferrofluids. The study showed that an appropriate chain length of alkyl alcohol may improve the extraction efficiency and maintain the integrity of ferrofluids during extraction, so 1-heptanol (C 7 ) was selected as the optimal carrier liquid. Specifically, the effects of various parameters on the extraction of phenolic compounds were investigated and optimized. Under the optimized conditions, the limits of detection were between 0.35 and 0.66 μg L −1 . The intra-day and inter-day precision (RSD %) for the analytes at 10 and 50 μg L −1 were in the range of 3.2–6.7 % and 2.9–7.1%, respectively.
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MICROCHEMICAL JOURNAL
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2018
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IF 2.746
Jingjing Zhang,Yu Chen,Wenying Wu,Zhipeng Wang,Yanjie Chu,Xiaohui Chen
In this study, a highly selective and binding hollow porous dummy molecularly imprinted polymer (HPDMIP) was prepared for the separation and determination of bisphenols (BPs) in plastic products using bisphenol AF (BPAF) as dummy template, 4-vinylpyridine as the functional monomer , and MCM-48 as sacrificial support. HPDMIP was characterized by FT-IR spectroscopy, scanning electron microscope, nitrogen adsorption experiment and thermo-gravimetric analysis. Adsorption and selectivity experiments revealed that HPDMIP had a superior adsorption capacity and fast binding kinetics for recognizing BPs. Therefore, a perfect method using HPDMIP as a sorbent material for solid-phase extraction (SPE) was developed, which achieved specific adsorption and enrichment of trace BPs in complex samples. In addition, accelerated solvent extraction (ASE) along with SPE were used as pretreatment method for extracting and concentrating the BPs, and the BPs were determined based on UHPLC–MS/MS. The conditions of ASE and SPE were thoroughly investigated and optimized. Meanwhile, in the ASE proceeding, a Box-Behnken design was applied. Under the optimal conditions, each target analyte had a good linearity between 0.1 and 50 μg·L −1 with regression coefficients in the range of 0.9967–0.9995. Limits of detection and quantification varied from 0.02 to 0.6 μg·L −1 and 0.05 to 2 μg·L −1 , respectively. The spiking recoveries between 50.8 and 138.31% for samples spiked at different concentration levels were achieved. The developed method eliminated the effect of template leakage on quantitative analysis and could be applied to extraction and analysis of BPs in different samples with satisfactory results, which provided a useful tool for further studying the BPs in complex samples.
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MICROCHEMICAL JOURNAL
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2018
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IF 2.746
Yuanchen Liu,Dan Wang,Fuyou Du,Wenqian Zheng,Zhimin Liu,Zhigang Xu,Xianzhi Hu,Hongcheng Liu
Four dummy templates (bisphenol B, bisphenol F , tetrabromobisphenol A, and 4-tert-butylphenol) were selected as template molecules to prepare a dummy-template molecularly imprinted polymer (MIP) for BPA analysis. The four of dummy-template MIP micro solid phase extraction bars showed good selectivity for bisphenol compounds and could be used to extract BPA present in real water samples. Furthermore, the strong bonding force between dummy-template and 4-vinyl pyridine (4-VP) was further verified by the theoretical calculations. It was found that the difference of the value coming from the system of dummy template and 4-VP was larger than that of BPA with 4-VP, revealing the strongest electronic interactions between the dummy template and 4-VP. Meanwhile, it also reveals that dummy-template MIPs are equally effective and even stronger in bonding bisphenol in complex samples. The dummy-template MIP micro solid phase extraction bars were suitable for trace BPA analysis in water samples without being affected by template leakage. The recoveries of BPA from pond water and sewage samples were 65.56–88.84% with the relative standard deviation of 1.30–8.93%. The linear range was 0.01–15 μg·L −1 (r 2 = 0.9998). The limit of detection was 0.003 μg·L −1 (signal-to-noise ratio (S/N = 3)). The limit of quantification, which was the lowest concentration that could be quantitatively detected, was found to be 0.01 μg·L −1 (S/N = 10). The proposed sample preparation method is easy, simple, and reproducible.
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JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Lingshuai Kong,Guodong Fang,Ya Kong,Meng Xie,Vinothkumar Natarajan,Dongmei Zhou,Jinhua Zhan
Wastewater systems contain a large number of compounds, such as anthropogenic aromatic pollutants and natural organic matter (NOM), and usually have pH higher than 4. Fenton-like reaction is the most widespread method for removal of organic pollutants, but their reactivity with H 2 O 2 may be inhibited by NOM due to the competition of hydroxyl radicals and chelating agents. In this work, Cu 2 O@β-cyclodextrin was developed to achieve the collaboration between molecular recognition and Fenton-like catalysis to destruct aromatic pollutants at neutral pH. In Cu 2 O@β-CD, covalent Cu O C bond was topotaxially converted from CuCl assisted by β-CD at room temperature. Covalently linked β-CD could keep humic acid from interfering catalytic performance of Cu 2 O surfaces and inhibit the leaching of copper. A higher catalytic ability was observed for Cu 2 O@β-CD with rate constant 0.0331 min −1 than Cu 2 O (0.0064 min −1 ) at neutral pH. A mechanism of synergistic catalysis was proposed on the basis of Cu + , β-CD and phenoxo-Cu 2+ complexes in the Cu 2 O@β-CD/BPA/H 2 O 2 system. The strategy of coupling molecular recognition into Fenton-like reaction provides an efficient and promising approach to the destruction of aromatic pollutants at neutral pH.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 47
·46837
·
IF 1.901
Junji Wei,Xiaojuan Meng,Xinyue Chen,Yafei Bai,Jiale Song,Ni Yan,Lei Zhu,Aiqin Shen
A new class of specialty polymer, fluorinated poly(arylene ether nitrile) (PAEN-F), was synthesized via the aromatic nucleophilic substitution reaction. Due to its rigid structure, PAEN-F exhibited enhanced heat resistance and thermal stability. Consequently, the glass-transition temperature and initial degradation temperature of PAEN-F reached as high as 179°C and 554°C, respectively. PAEN-F also showed excellent solubility in low-boiling solvents owing to fluorine groups and the nonplanar structure in the repeat unit. Due to its strong 6F dipoles, PAEN-F exhibited a high dielectric constant (ɛ r ) of 3.6, a high electrical breakdown strength of 346 MV/m, and a reasonably low dissipation factor (tan δ) of 0.014 at 25°C and 100 Hz. Therefore, this dipolar glass polymer is promising for high-temperature and low-loss electric energy storage applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46837.
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Materials
·
2018
·Vol. 11
·期 10
·1881
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IF 2.467
Jingrong Hu,Wangwei Liu,Huiling Liu,Lamei Wu,Huijuan Zhang
Magnetic dodecyl chitosan/silica composite was synthesized and characterized for the enrichment of emerging bisphenol contaminants. The result demonstrated that bispehnol A, bisphenol AF, bisphenol F, and bisphenol S can be efficiently extracted via the resulting composite from aqueous solution. The adsorption rate of four investigated bisphenols on the resulting composite was achieved in the range of 87–99% within 15 min. Bispehnol A was taken as a representative adsorbate to investigate the adsorption studies in detail. The hydrophobic interaction was proposed as the principal mechanism for the adsorption of BPs. The satisfactory reusability of the resulting composite can be quickly achieved by magnetic separation technologies. Magnetic dodecyl chitosan/silica composite has a potential to be applied as a type of efficient and easily recyclable sorbent for the removal of trace organic pollutants from aqueous sample.Keywords:magnetic dodecyl chitosan/silica composite;bisphenols;enrichment
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