ANALYTICAL LETTERS
·
2014
·
IF 1.019
Zhidong Chen,Chuangui Tang,Yanbo Zeng,Haiqing Liu,Zhengzhi Yin,Lei Li
A novel electrochemical sensor for bisphenol A was developed through the combination of a molecular imprinting technique with a multiwalled carbon nanotube paste electrode. A molecularly imprinted polymer and nonimprinted polymer were synthesized in the presence and absence of bisphenol A, and then used to prepare the electrode. The bisphenol A imprinted polymer was applied as a selective recognition element in the electrochemical sensor. Differential pulse voltammetry was used to characterize the electrochemical behavior of bisphenol A at the modified electrodes. The results showed that the imprinted sensor had highest response for bisphenol A. Parameters including the carbon paste composition, pH, and adsorption time for the imprinted sensor were optimized. Under the optimized conditions, the differential pulse voltammetry peak current was linear with the concentration of bisphenol A from 0.08 to 100.0 µM, with a detection limit of 0.022 µM. The imprinted sensor for bisphenol A exhibited good selectivity, stability, and reproducibility. This sensor was successfully used for the determination of bisphenol A in real water samples.
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JOURNAL OF MEMBRANE SCIENCE
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2014
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IF 4.908
Guang Lu Han,Pei Yu Xu,Ke Zhou,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
A series of poly (arylene ether sulfone) block copolymers with hydrophilic segments containing fluorene groups were successfully synthesized as confirmed by 1 H NMR. The molecular weights were measured in the range 115–140 kDa by gel permeation chromatography (GPC). The hydrophilic segment showed a helical structure due to fluorene with butterfly-shaped framework in the main chain. With incorporating imidazolium groups, the microphase separation can also be achieved between the hydrophilic and the hydrophobic moieties. The membrane structure was characterized by positron annihilation lifetime spectroscopy (PALS) and small angle X-ray scattering (SAXS). The block copolymers were used to prepare membranes successfully for pervaporation separation of methanol (MeOH)/methyl tert-butyl ether (MTBE) mixture. The correlation between the membrane microstructure and the separation performance was discussed thoroughly. By increasing the hydrophilic segment proportion, the permeation flux increased while the separation factor declined. The membranes have the highest permeation flux (0.334 kg m −2 h −1 ) and the lowest separation factor (287) for a 15 wt% MeOH feed mixture at 40 °C, and the mass fraction of MeOH in the permeate is higher than 98 wt%.
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Analytical Methods
·
2013
·Vol. 5
·期 19
·5037-5043
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IF 1.855
Yingtang Li,Yang Jiao,Yuhong Guo,Yaling Yang
A new and fast microextraction technique termed vortex-assisted supramolecular solvent microextraction (VASUSME) has been developed. The method was based on the microextraction of endocrine disrupting compounds (EDCs), including bisphenol-A (BPA), 2,4-dichlorophenol (2,4-DCP), bisphenol-AF (BPAF) and tetrabromobisphenol-A (TBBPA) in 10 mL sample with 500 μL of a supramolecular solvent (SUPRASs), and then detection by high-performance liquid chromatography (HPLC). In the VASUSME procedure, dispersion of microvolumes of a low density extraction solvent into the aqueous sample is achieved by vortex mixing, a mild emulsification procedure. Under the optimum conditions, the repeatability of the proposed method was found to be good. The relative standard deviations (RSD, n = 5) were 3.98–5.64%. The limits of detection (LOD) were in the range of 0.14–0.32 ng mL−1 and the limits of quantification (LOQ) were in the range of 0.41–1.02 ng mL−1. All correlation coefficients of the calibration curves were higher than 0.998. Recoveries of the EDCs spiked into samples of liquid foods and their packaging materials were in the range of 91% to 105.1%. The VASSUSME method was successfully applied to the analysis of BPA, 2,4-DCP, BPAF and TBBPA in samples of liquid foods and their packaging materials. Moreover, the method is simple, sensitive and environmentally-friendly and consumes much less solvent than traditional methods.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 4
·2801-2808
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IF 1.395
Miao Yin,Li Yang,Xiu-yun Li,Han-bing Ma
The fluorinated epoxy resin, 2,2-bisphenol hexafluoropropane diglycidyl ether (DGEBHF) was synthesized through a two-step procedure, and the chemical structure was confirmed by 1 H n uclear magnetic resonance (NMR), 13 C NMR, and Fourier transform infrared (FTIR) spectra. Moreover, DGEBHF was thermally cured with methyl hexahydrophthalic anhydride (MHHPA). The results clearly indicated that the cured DGEBHF/MHHPA exhibited higher glass transition temperature ( T g 147°C) and thermal decomposition temperature at 5% weight loss ( T 5 372°C) than those ( T g 131.2°C; T 5 362°C) of diglycidyl ether of bisphenol A (DGEBA)/MHHPA. In addition, the incorporation of bis-trifluoromethyl groups led to enhanced dielectric properties with lower dielectric constant ( D k 2.93) of DGEBHF/MHHPA compared with cured DGEBA resins ( D k 3.25). The cured fluorinated epoxy resin also gave lower water absorption measured in two methods relative to its nonfluorinated counterparts. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2801–2808, 2013
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ANALYTICA CHIMICA ACTA
·
2013
·
IF 4.387
Jin-Qun Xue,Da-Wei Li,Lu-Lu Qu,Yi-Tao Long
Surface-imprinted core–shell Au nanoparticles (AuNPs) were explored for the highly selective detection of bisphenol A (BPA) by surface-enhanced Raman scattering (SERS). A triethoxysilane-template complex (BPA-Si) was synthesized and then utilized to fabricate a molecularly imprinted polymer (MIP) layer on the AuNPs via a sol–gel process. The imprinted BPA molecules were removed by a simple thermal treatment to generated the imprint-removed material, MIP-ir-AuNPs, with the desired recognition sites that could selectively rebind the BPA molecules. The morphological and polymeric characteristics of MIP-ir-AuNPs were investigated by transmission electron microscopy and Fourier-transform infrared spectroscopy. The results demonstrated that the MIP-ir-AuNPs were fabricated with a 2 nm MIP shell layer within which abundant amine groups were generated. The rebinding kinetics study showed that the MIP-ir-AuNPs could reach the equilibrium adsorption for BPA within 10 min owning to the advantage of ultrathin core–shell nanostructure. Moreover, a linear relationship between SERS intensity and the concentration of BPA on the MIP-ir-AuNPs was observed in the range of 0.5–22.8 mg L −1 , with a detection limit of 0.12 mg L −1 (blank ± 3 × s.d.). When applied to SERS detection, the developed surface-imprinted core–shell MIP-ir-AuNPs could recognize BPA and prevent interference from the structural analogues such as hexafluorobisphenol A (BPAF) and diethylstilbestrol (DES). These results revealed that the proposed method displayed significant potential utility in rapid and selective detection of BPA in real samples.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Ao Nan Lai,Li Sha Wang,Chen Xiao Lin,Yi Zhi Zhuo,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
A series of novel quaternized benzylmethyl-containing poly(arylene ether nitrile)s (QPENs) were synthesized via condensation polymerization, bromination and quaternization. N,N,N′,N′-tetramethyl-1,6-diaminohexane dissolved in isopropanol was used as the quaternization reagent for the preparation of target anion exchange membranes (AEMs). 1 H NMR spectroscopy , Fourier transform infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC) were used to characterize the as-synthesized copolymers . The ratio of hydrophilic to hydrophobic segment on the polymer backbone was varied to study the structure–property of the AEMs. With strong nitrile dipole interchain interactions and a self-crosslinked structure, the resulting AEMs possess a self-anti-swelling property resulting in a low water uptake and swelling ratio. The AEMs show high ionic conductivity (under hydrated conditions) above the magnitude of 10 −2 S cm −1 . The membranes with distinct phase separation morphology have a higher ionic exchange capacity (IEC). The methanol permeability of the AEMs in the range 3.18–9.69×10 −8 cm 2 s −1 at 30 °C and 8.92–25.57×10 −8 cm 2 s −1 at 60 °C is lower than that of Nafion ® 117. The AEMs show an excellent alkaline stability in a 2 M NaOH solution at 60 °C for 1080 h. A single cell with the QPEN membrane shows an open circuit voltage of 0.84 V. A maximum power density of 79.1 mW cm −2 at a current density of 207 mA cm −2 can be achieved at 60 °C. In summary the AEMs are good candidates for evaluation in fuel cells.
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JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2014
·Vol. 25
·期 8
·1512-1519
·
IF 1.253
Li Yingtang,Yang Guorong,Zhao Jiao,Yang Yaling
In this study, a vortex-assisted three-phase hollow fiber liquid-phase microextraction (VA-HF-LPME) coupling with high performance liquid chromatography (HPLC) method was developed for determination of three synthetic endocrine disrupting compounds[EDCs, bisphenol-A (BPA), bisphenol-AF (BPAF) and tetrabromobisphenol-A (TBBPA)] in milk samples. Vortex provided effective and mild mixing of the sample solution and increased the contact between analytes and boundary layers of the hollow fibre, thereby enhancing mass transfer rate and leading to high extraction efficiency of the target analytes. The influencing parameters of VA-HF-LPME sample preparation method, such as organic solvents (acceptor phase), pH of sample solution (donor phase), sample volume, concentration of NaOH, extraction time, and ionic strength were systematically optimized. The instrumental calibration curves of BPA, BPAF and TBBPA show good linear relations (R² > 0.9988) in the concentration range of 0.5-200, 0.5-200 and 1.0-250 µg L-1, respectively. The relative standard deviations (RSD, n = 5) were 1.3-3.7%. The limits of detection (LOD, S/N = 3) were in the range of 0.16-0.35 µg L-1 and the limits of quantification (LOQ, S/N = 10) were in the range of 0.51-1.12 µg L-1. The proposed method was successfully applied to the extraction of EDCs in milk samples.
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FOOD CHEMISTRY
·
2017
·
IF 4.529
Dezhi Yang,Xiaolan Li,Dongling Meng,Meng Wang,Yaling Yang
A magnesium–aluminum layered double hydroxides coated on magnetic nanoparticles (Fe 3 O 4 @MgAl-LDHs NPs) combined with the supramolecular solvents (SUPRASs) as the magnetic supramolecular fluids were successfully applied to the extraction and determination of four phenolic compounds (Bisphenol-A (BPA), bisphenol-AF (BPAF), tetrabromobisphenol-A (TBBPA) and 4-tert-octylphenol (4-TOP)). Magnetic supramolecular fluids (ferrofluids) composites were prepared through adding the mixture of n -octanol and tetrahydrofuran in distilled water as the supramolecular solvents into the solution containing magnetic Fe 3 O 4 @MgAl-LDHs NPs. Under the optimized conditions, the calibration curve was obtained in range of 5–1000 μg L −1 . The limits of detection (S/N = 3) for BPA, BPAF, TBBPA and 4-TOP, were obtained for 0.54, 0.48, 0.37 and 0.63 μg L −1 , respectively. The intra-day and inter-day precision (RSDs %) for bisphenols (BPs) and 4-TOP at 100 and 300 μg L −1 were in the range of 4.0–7.8. The enrichment factors were between 16 and 24.
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Materials Chemistry Frontiers
·
2017
·Vol. 1
·期 10
·2031-2038
·
IF 0
Zhenzhen Cai,Yuping Zhang,Yilong Song,Qiuli Cheng,Yang Zheng,Zhanchen Cui,Zuosen Shi,Changming Chen,Daming Zhang
In this paper, we report the design, synthesis, and optical properties of novel negative-type fluorinated polycarbonate photoresists (FPC-PRs) and their use in thermo-optic switches. The novel polymer films are readily fabricated by spin coating on a silicon wafer followed by irradiation with UV light and post-baking at 110 °C. These films exhibit low roughness, good thermal stability (Td, up to 292 °C), high transparency (up to 97.8% at 400 nm) and high refractive indices (RI, 1.583–1.512 at 1550 nm). Channel optical waveguide and MZI thermo-optic waveguide switch arrays were fabricated based on the direct UV-written technique using the FPC-PR 2. The propagation loss of the channel waveguide was only 0.17 dB cm−1 at 1550 nm. The rise and fall times of the device with an applied 500 Hz square-wave voltage were 837 μs and 381.8 μs, respectively. The applied electric power as the switching power was about 35 mW, and the extinction ratio was measured to be about 14.0 dB.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Cheng Qin,Yumeng Qi,Qing Zheng,Xiaolei Teng,Ahmed A. Allam,Ahmed Rady,Zunyao Wang,Ruijuan Qu
In this study, we conducted a systematic study of bisphenol AF (BPAF) removal by visible light coupled zero valent iron activated persulfate (Vis/Fe 0 /PS) system. The results showed that in Fe 0 /PS system, the removal rate of BPAF increased by 46.4% with the addition of Vis. New mechanisms were proposed: that PS became excited under Vis irradiation, which favored its reaction with Fe 2+ to produce more free radicals. Moreover, Fe 3+ could form complex with mono-hydroxylated and mono-carboxylated intermediate of BPAF, and the photoinduced ligand-metal charge transfer (LMCT) process could effectively transfer the charge to the metal ion, accelerating the reduction of Fe 3+ to Fe 2+ to enhance the generation of free radicals. The generation of hydroxylation products of bisphenol AF in the Vis/Fe 0 /PS system was greatly increased compared to the Fe 0 /PS system. The Vis/Fe 0 /PS system had a great application prospect, as it reduced the economic cost of treating bisphenol AF by at least 49.5% compared to other methods. Moreover, 99.6% of bisphenol AF was degraded after 45 min of reaction under natural light. Findings of this study provides new insights into the synergistic role of Vis in Fe 0 /PS systems and may advance the practical application of Vis/Fe 0 /PS system in water and wastewater treatment.
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Food Bioscience
·
2024
·
IF 4.8
Cheng Yang,Yan Wang,Pei-Zhi Dong,Yanan Li,Yue-Hong Pang
Bisphenols (BPs) pose a pervasive threat to human health due to their potential to leach from plastic packaging into food, thereby endangering the endocrine system. Given their low concentrations in complex samples, the development of a swift, efficient pretreatment method is imperative. In this study, a magnetic covalent organic framework (Fe 3 O 4 @TzDa) was synthesized via a layer-by-layer growth approach, utilized in rapid magnetic solid-phase extraction (MSPE) combined with liquid chromatography-tandem mass spectrometry (LC-MS/MS) for the determination BPs. This method exhibited remarkable sensitivity, detecting five BPs (BPS, BPF, BPA, BPB, and BPAF) at levels between 0.68 and 0.77 μg L −1 . Fe 3 O 4 @TzDa nanocomposites maintained an extraction efficiency of approximately 98.0% over five cycles, ensuring robust and repeatable performance. Sample analysis, encompassing plastic bottled water, pear juice, mix juices, pop-top canned curry beef, and box-packed milk, yielded recoveries of 72.0%–114.0% (RSDs <7.5%, n = 5). Furthermore, BPs migration in sports cups and portable bottles was evaluated, revealing migration levels ranging from 0.0014 to 0.0058 mg kg −1 . This study advances BP analysis by introducing a reliable method for their efficient determination in beverage samples from plastic food packages. The utilization of Fe 3 O 4 @TzDa underscores a pivotal advancement in sample preparation, enhancing both sensitivity and efficiency for the extraction and determination of BPs in food samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhao Song,Yu Zhang,Peiru He,Xuesong Liu,Nanqi Ren,Yidi Chen
Phenolic pollutants are highly toxic and can affect the growth and reproduction of aquatic organisms, as well as contaminate drinking water resources, posing a significant threat to both ecological and human health. However, conventional biological treatment processes are constrained in treating high salinity organic wastewaters due to the potentially lethal effects of high concentrations of dissolved salts on microorganisms. While advanced oxidation processes have shown promise in removing phenolic contaminants from high-saline wastewater, their widespread application is always limited by the high costs associated with energy and chemical usage. In this study, we explored the potential application of directly introducing peroxymonosulfate (PMS) and peracetic acid (PAA) to high-salinity water for the removal of nine phenolic contaminants. By establishing a correlation between the degradation rate constants in the PMS/Cl – ( k PMS ) and PAA/Cl – ( k PAA ) systems and various molecule descriptors, two multiple linear regression models were developed to predict the degradation rate constants under investigation. Additionally, we selected bisphenol A (BPA) as the target contaminant and investigated the impact of common ions found in natural water, such as HCO 3 – , NO 3 – , and humic acid, on the removal of BPA using two systems. Finally, we conducted experiments using tap water and sewage water to demonstrate the practical application and performance of the two systems. These experiments aimed to provide valuable insights into the influence of background chloride on PMS and PAA activation, as well as the potential of direct PMS/PAA introduction for eliminating phenolic micropollutants from high-saline wastewaters.
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