JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2012
·
IF 3.07
Aikifa Raza,Yang Si,Bin Ding,Jianyong Yu,Gang Sun
Superhydrophobic films on glass substrate with robust adhesion and dual pinning to the water droplets were fabricated utilizing a novel in situ polymerized fluorinated polybenzoxazine (F-PBZ) having drooping aliphatic chains and incorporated SiO 2 nanoparticles (SiO 2 NPs). By employing the F-PBZ/SiO 2 NPs modification, the as-prepared composite films possess the robust adhesion to the glass substrate and superhydrophobic pinned state with water contact angle (WCA) of 150° and the non-pinned state with WCA approaching to 165°. Surface morphological studies have indicated that the wettability of the resultant films could be controlled by tuning the surface composition as well as the hierarchical structures. The key role of micro and sub-micro-sized structures and the nanometer sized voids is discussed by the investigation into static contact angle, contact angle hysteresis, droplet evaporation, and propensity for air pocket formation. The as-prepared films exhibited high adhesion toward the glass substrate with considerable durability in corrosive water and proved their simultaneous use in the transportation of micro-droplets, which could be helpful to design large-area and highly scalable superhydrophobic films.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2014
·Vol. 119
·期 3
·1913-1921
·
IF 2.206
Wang Hui,Wang Jun,Feng Tian-tian,Ramdani Noureddine,Li Yue,Xu Xiao-dong,Liu Wen-bin
A series of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s (co-PEKKs) were successfully synthesized, in which the co-PEKKs were prepared with different molar ratios of 2,7-dihydroxy-9-fluorenone to bisphenol-A. The obtained phenol-ended co-PEKKs reacted with formaldehyde and n -butylamine to yield the benzoxazine-endcapped co-PEKKs (B-PEKKs). The structure of these oligomers was studied by Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy, and the molecular mass of these phenol-ended co-PEKKs was detected by gel permeation chromatography. The thermal behaviors of these B-PEKKs were determined by differential scanning calorimetry. In addition, the thermal and dynamic mechanical properties of the polymer films were investigated by thermogravimetric analysis and dynamic mechanical analysis. The results indicate that the incorporation of co-PEKKs within the benzoxazine backbone considerably improves the toughness of the fluorene-containing polybenzoxazines without much sacrifice of their thermal properties. Furthermore, as the content of 2,7-dihydroxy-9-fluorenone increases, the T
5 values decrease, while the T
g values and char yields of the prepared polymers increase to reach their highest values at 256 °C and 64 %, respectively.
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Analytical Methods
·
2014
·Vol. 6
·期 10
·3285-3290
·
IF 1.938
Yingtang Li,Chao Yang,Jinyan Ning,Yaling Yang
In this work, cloud point extraction (CPE) was developed for the preconcentration and separation of bisphenol A (BPA), bisphenol AF (BPAF) and tetrabromobisphenol A (TBBPA) prior to high-performance liquid chromatography (HPLC) analysis. Firstly, alcohol ethoxylate (AEO9) was applied as the extractant and octanol worked as the cloud point revulsant and synergic reagent for extraction, which decreased the cloud point temperature (CPT) of AEO9 from 75 °C to 30 °C and assisted the subsequent extraction. The parameters influencing the CPE efficiency, such as AEO9 concentration, octanol volume, pH value, extraction time and temperature were systematically evaluated. Under the optimum conditions, the linear range of BPA, BPAF and TBBPA was from 0.05 to 25 mg L−1. All correlation coefficients of the calibration curves were more than 0.9988. The relative standard deviations (RSD, n = 5) were 1.6–4.7%. The limits of detection (LOD) were in the range of 0.27–0.32 μg L−1 and the limits of quantification (LOQ) were in the range of 0.71–0.98 μg L−1. The proposed method was successfully applied to the extraction of BPA, BPAF and TBBPA in river water samples as a rapid, simple, and sensitive method.
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MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 5
·565-572
·
IF 3.719
Ma Ming,Tu Xiaojing,Zhan Guoqing,Li Chunya,Zhang Shenghui
The ionic liquid 1-butyl -3-[3-(N-pyrrole)-propyl]imidazolium tetrafluoroborate was employed to fabricate a glassy carbon electrode (GCE) modified with a porous film of a polymerized ionic liquid. The resulting film electrode was treated with sodium dodecyl sulfonate solution to exchange the terafluoroborate anions by dodecyl sulfonate groups. This was confirmed by X-ray photoelectron spectroscopy. The morphology of the modified GCE was characterized by scanning electron microscopy and revealed a nanoporous surface. The electrochemical properties of this film electrode were studied by electrochemical impedance spectroscopy using the hexacyanoferrate(II/III) system as an electroactive probe. The response to bisphenol A was investigated by voltammetry. Compared to the unmodified GCE, the oxidation potential is positively shifted, and the oxidation peak current is strongly increased. Experimental conditions were optimized and resulted in an oxidation peak current that is linearly related to concentration of bisphenol A in the 10 nM to ~ 10 μM range. The detection limit is 8.0 nM (at S / N = 3). The electrode was successfully applied to the determination of bisphenol A in leachates of plastic drinking bottles, and its accuracy was verified by independent assays via HPLC.
A poly{1 -butyl -3 -[3 -(N -pyrrole)propyl] imidazolium dodecyl sulfonate ionic liquid} nanoprous film electrode was fabricated with potential step technique and anionic exchange. The obtained polymerized ionic liquid film electrode was demonstrated possessing enhanced effects for bisphenol A determination.
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CHINESE CHEMICAL LETTERS
·
2013
·
IF 1.21
Long Zhang,Yang-Ping Wen,Yuan-Yuan Yao,Zi-Fei Wang,Xue-Min Duan,Jing-Kun Xu
A simple, sensitive, and reliable method for the voltammetric determination of bisphenol A (BPA) by using carboxylic group functionalized single-walled carbon nanotubes ( f -SWCNT)/carboxylic-functionalized poly(3,4-ethylenedioxythiophene) (PC4) complex modified glassy carbon electrode (GCE) has been successfully developed. The electrochemical behavior of BPA at the surface of the modified electrode is investigated by electrochemical techniques. The cyclic voltammetry results show that the as-prepared electrode exhibits strong catalytic activity toward the oxidation of BPA with a well-defined anodic peak at 0.623 V in PBS (0.1 mol/L, pH 7.0). The surface morphology of the 3D network of composite film is beneficial for the adsorption of analytes. Under the optimized conditions, the oxidation peak current is proportional to BPA concentration in the range between 0.099 and 5.794 μmol/L ( R 2 = 0.9989), with a limit of detection of 0.032 μmol/L ( S / N = 3). The enhanced performance of the sensor can be attributed to the excellent electrocatalytic property of f -SWCNT and the extraordinary conductivity of PC4. Furthermore, the proposed modified electrode displays high stability and good reproducibility. The good result on the voltammetric determination of BPA also indicates that the as-fabricated modified electrode will be a good candidate for the electrochemical determination and analysis of BPA.
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Food Analytical Methods
·
2013
·Vol. 7
·期 7
·1381-1386
·
IF 1.969
Ma Xiaoxing,Wang Juntao,Wu Qiuhua,Wang Chun,Wang Zhi
A new analytical method by graphene-reinforced hollow fiber liquid-phase microextraction combined with high-performance liquid chromatography fluorescence detection was developed for the determination of bisphenol A and 4- tert -butylphenol in bottled juices. Several important experimental parameters were studied to get optimal extraction conditions for the analytes. Under the optimized conditions, the method showed a good performance having a linear response in the range from 0.05 to 10.0 ng mL −1 with the correlation coefficients ( r ) of 0.9965–0.9994 and limits of detection of 0.01 ng mL −1 . The relative standard deviations were in the range from 6.4 to 7.2 % at the spiked concentration of 1.0 ng mL −1 . The method combines the high-adsorption capacity of graphene and the excellent clean-up performance of hollow fiber liquid-phase microextraction and has been successfully applied to the analysis of the analytes in bottled juice samples.
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ANALYTICA CHIMICA ACTA
·
2013
·
IF 4.387
Jianjun Shu,Pengfei Xie,Danni Lin,Rongfeng Chen,Jiang Wang,Beibei Zhang,Mingming Liu,Hanlan Liu,Fan Liu
In this work, two novel crown ether functionalized ionic liquid (FIL)-based solid phase microextraction (SPME) fibers were prepared by sol–gel technology using the synthesized 1-(trimethoxysily)propyl 3-(6′-oxo-benzo-15-crown-5 hexyl) imidazolium bis(trifluoromethanesulphonyl)imide ([TMSP(Benzo15C5)HIM][N(SO 2 CF 3 ) 2 ]) and 1-allyl-3-(6′-oxo-benzo-15-crown-5 hexyl) imidazolium bis(trifluoromethanesulphonyl)imide ([A(Benzo15C5)HIM][N(SO 2 CF 3 ) 2 ]) as selective stationary phases. Owing to the introduction of trimethoxysilypropyl to the imidazole cation, the [TMSP(Benzo15C5)HIM][N(SO 2 CF 3 ) 2 ] could be chemically bonded to the formed sol–gel silica substrate through the hydrolysis and polycondensation reaction. Similarly, the [A(Benzo15C5)HIM][N(SO 2 CF 3 ) 2 ] was able to participate in the formation of the organic–inorganic copolymer coatings through the free radical crosslinking reaction. These two fibers were determined to have “bubble-like” surface characteristics analogous to a previously prepared [A(Benzo15C5)HIM][PF 6 ]-based fiber. Their thermal stabilities were much higher than that of the [A(Benzo15C5)HIM][PF 6 ]-based coating. They were capable of withstanding temperatures as high as 400 °C without evident loss of the crown ether FILs. They also had strong solvent, acid and alkali resistance, good coating preparation reproducibility and high selectivity for medium polar to polar compounds. The high selectivity of these two fibers could be attributed to the strong ion-dipole, hydrogen bonding and π–π interactions provided by the synergetic effect of ILs and benzo-15-crown-5 functionalities. Moreover, the selectivity of these two fibers was rather different although the structures of these two crown ether FILs were very similar. This is maybe because the relative contents of the crown ether FILs chemically bonded to the organic–inorganic copolymer coatings were quite different when prepared by different sol–gel reaction approaches.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
·
2015
·
IF 2.96
Yan-Qing Wang,Hong-Mei Zhang
Bisphenol A and its analogues have carcinogenic potentials and toxicities. However, there are lacks of studies elucidating gene toxic interactions of bisphenols with DNA. In this work, the binding modes of five bisphenol compounds with calf thymus DNA were characterized. The multi-spectroscopic experimental results indicated that the fluorescence quenching of bisphenols by calf thymus DNA point to groove binding. The ultraviolet visible and circular dichroism spectral data displayed that bisphenols partly induced conformational changes of calf thymus DNA. In addition, the binding constants of bisphenol A, diphenolic acid, bisphenol AF, bisphenol AP, bisphenol fluorine with calf thymus DNA obtained from fluorescence emission spectra were 1.09 × 10 4 , 3.65 × 10 4 , 4.46 × 10 4 , 1.69 × 10 4 , 4.49 × 10 4 L mol −1 at 298.15 K, which indicated that the multi-noncovalent binding forces were involved in the binding processes. In silico investigations indicated that DNA has the preferable binding sites binding with bisphenols by minor groove binding and electrons transfer from DNA bases to bisphenols occurred. In addition, the structural differences of these five bisphenols partly affected the binding ability of them with DNA.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2015
·
IF 5.33
Xiaobo Wang,Yanlei Qin,Lihua Zhu,Heqing Tang
Nitrogen modified reduced graphene oxide (N-RGO) was prepared by a hydrothermal method. The nitrogen modification enhanced its adsorption and catalysis ability. For an initial bisphenol concentration of 0.385 mmol L–1, the adsorption capacity of N-RGO was evaluated as 1.56 and 1.43 mmol g–1 for bisphenol A (BPA) and 1.43 mmol g–1 for bisphenol F (BPF), respectively, both of which were about 1.75 times that (0.90 and 0.84 mmol g–1) on N-free RGO. N-RGO could activate persulfate, producing strong oxidizing sulfate radicals. The apparent degradation rate constant of BPA on N-RGO was 0.71 min–1, being about 700 times that (0.001 min–1) on N-free RGO. In mixtures of various phenols, the degradation rate constant of each phenol was linearly increased with its adsorption capacity. A simultaneous use of N-RGO and persulfate yielded fast and efficient removal of bisphenols. The use of N-RGO (120 mg L–1) and persulfate (0.6 mmol L–1) almost completely removed the added bisphenols (0.385 mmol L–1) at pH 6.6 within 17 min. A mechanism study indicated that the adsorption enriched the pollutant, and the catalytically generated sulfate radicals rapidly degrade the adsorbed pollutant, accelerating in turn the adsorption of residual pollutant.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 32
·期 11
·1550-1563
·
IF 1.42
Yan Hua,Lu Chun-xiang,Jing De-qi,Hou Xiang-lin
Chemical degradation of diglycidyl ether of bisphenol A (DGEBA) epoxy resin cured with an aliphatic amine in supercritical 1-propanol was investigated under different reaction temperature and time. The combination of GC-MS and LC-MS proved that the epoxy resin was decomposed to five main products including phenol, 4-isopropylphenol, 4-isopropenylphenol, bisphenol A, and 4,4′-(cyclopropane-1,1-diyl)diphenol. The 13 C-NMR results verified the chemical structures of the degradation products. The change of the products’ yield with time was evaluated by an effective means of HPLC. In addition, the GPC analysis confirmed the formation of soluble low molecular weight clusters during the degradation reaction. A possible free-radical reaction mechanism was proposed for chemical depolymerization of the epoxy resin in supercritical 1-propanol. After the homolytic cleavage of the aromatic ether linkages, the resulting bisphenol A biradical either produced 4,4′-(cyclopropane-1,1-diyl)diphenol after intramolecular rearrangement or generated bisphenol A after capturing hydrogen from 1-propanol.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Ruixiong Huang,Zhanqiang Fang,Xiaobo Fang,Eric Pokeung Tsang
In this study, Fe 3 O 4 NPs (named as Fe 3 O 4 NPs-PO) were prepared by steel pickling waste liquor to reduce the cost of preparation, and were compared with those obtained by the common co-precipitation method (named as Fe 3 O 4 NPs-CP) which prepared from chemical reagent using BET, XRD, XPS, TEM and SEM techniques. The results indicated that Fe 3 O 4 NPs-PO nanoparticles mainly existed in the form of Fe 3 O 4 and appeared to be roughly spherical in shape with a size range of 20–50 nm. The heterogeneous Fenton-like catalytic capacity of Fe 3 O 4 NPs-PO in US + Fe 3 O 4 + H 2 O 2 system was comprehensively investigated. BPA could be degraded within a wide pH range of 7–10. The removal efficiencies of BPA were close to 100% and about 45% total organic carbon (TOC) in solution was eliminated at the optimized conditions. It was found that· OH radicals which mainly caused the degradation of BPA were promptly generated due to the catalysis of the Fe 3 O 4 NPs-PO. Furthermore, the comparative study of catalytic activity, stability and reusability between Fe 3 O 4 NPs-PO and Fe 3 O 4 NPs-CP showed that the two catalysts both remained good activity after several reaction cycles and no significant change in composition and structure was observed, the loss of catalyst was negligible, which demonstrated that Fe 3 O 4 NPs-PO were promising in ultrasonic Fenton-like process to treat refractory organics.
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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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