ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xuan Xu,Qiqin Zheng,Guangmin Bai,Lishu Song,Yuewei Yao,Xiaodong Cao,Songqin Liu,Cheng Yao
Bisphenol A (BPA) is one of the most prevalent environmental endocrine disrupting chemicals with potential estrogenic activity. Herein we report a facile electrochemical sensing strategy for ultrasensitive detection of BPA based on the hybrid of AuNPs decorated reduced graphene oxide (RGO). This Au@PDA-RGO hybrid was synthesized by in-situ growth of AuNPs induced by polydopamine (PDA) on RGO. Since PDA acts as a moderate reducing agent and an effective linker, AuNPs scatter well on RGO with controllable density, homogeneous size and uniform distribution. With the aid of chitosan (Chit), an electrochemical tyrosinase (Tyr) biosensor based on Au@PDA-RGO was constructed on glassy carbon electrode (Tyr/Au@PDA-RGO-Chit/GCE). This immobilization matrix possesses high conductivity, large active areas and a suitable biological microenvironment. As a result, the constructed Tyr biosensor exhibited good analytical performance for BPA with a high sensitivity of 0.2569 A M −1 , a wide linear range from 12.5 nM to 3.68 μM, and a low detection limit of 0.10 nM (S/N = 3). This method was also applied to detect BPA in plastic products, showing good agreement with the values detected by HPLC-MS/MS.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 22
·
IF 1.866
Zhidong Ren,Yuanrong Cheng,Yan Li,Fei Xiao
Three novel bismaleimide monomers (MBA-BMI, EBA-BMI, and PBA-BMI) with unsymmetrical backbone and different pendant groups were synthesized using asymmetric diamine and maleic anhydride as the precursors. The prepared bismaleimide monomers show good solubility in common organic solvents such as acetone and tetrahydrofuran. The EBA-BMI melt treated at 180 °C also shows low viscosity about 190–934 mPa s at the temperature range of 160–139 °C below its melting point (166 °C). In addition to the good processability, all three cured bismaleimides show high storage moduli at high temperatures (2.0 GPa at 400 °C), high glass transition temperatures over 400 °C, and good thermal stability with the 5% weight loss temperatures around 470 °C under nitrogen atmosphere. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43491.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 20
·
IF 1.866
Caihong Wang,Hao Wu,Fangshu Qu,Heng Liang,Xiaojun Niu,Guibai Li
To investigate the influence of magnetic materials combined with carbon nanotubes (CNTs) as fillers on the membrane properties, multi-walled carbon nanotubes (MWCNTs) functionalized by mixed acids (V H2SO4 :V HNO3 =3:1) were loaded by Fe 3 O 4 through a hydrothermal method. The obtained MWCNTs/Fe 3 O 4 hybrids were characterized by X-ray diffraction (XRD), Infrared spectroscopy (IR) spectrum, and scanning electron microscope (SEM) and then blended with polyvinyl chloride (PVC) to prepare ultrafiltration (UF) membranes through a phase inversion process. Simultaneously, two other UF membranes, PVC blended with acid-treated MWCNTs and PVC blended with nothing, were also prepared. The results showed that the membrane porosity and mean pore size increased slightly with the addition of fillers. Static contact angle showed that MWCNTs/Fe 3 O 4 hybrids improved the hydrophilicity of membrane surface better than the acid-treated MWCNTs. Pure water flux increased consistently with the hydrophilicity of the membrane surface. SEM and atomic force microscope (AFM) images showed that the MWCNTs/Fe 3 O 4 blended membrane formed a relatively complete pore structure throughout the cross-section and had a rougher top surface. However, the mechanical properties of membranes with fillers were reduced compared with the pristine PVC membrane. The rejections of membranes for Bovine serum albumin (BSA), Bisphenol A (BPA), and Norfloxacin (NOR) showed that MWCNTs/Fe 3 O 4 played an important role in trapping pollutants in membrane filtration. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43417.
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ANALYTICAL BIOCHEMISTRY
·
2016
·
IF 2.243
Dongwei Zhang,Jiayi Yang,Jing Ye,Lurong Xu,Hanchu Xu,Shenshan Zhan,Bing Xia,Lumei Wang
In this study, a colorimetric method was exploited to detect bisphenol A (BPA) based on BPA-specific aptamer and cationic polymer-induced aggregation of gold nanoparticles (AuNPs). The principle of this assay is very classical. The aggregation of AuNPs was induced by the concentration of cationic polymer, which is controlled by specific recognition of aptamer with BPA and the reaction of aptamer and cationic polymer forming “duplex” structure. This method enables colorimetric detection of BPA with selectivity and a detection limit of 1.50 nM. In addition, this colorimetric method was successfully used to determine spiked BPA in tap water and river water samples.
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PubMed
高影响因子
TALANTA
·
2017
·
IF 4.162
Qian Yang,Xiaqing Wu,Hailong Peng,Longwen Fu,Xingliang Song,Jinhua Li,Hua Xiong,Lingxin Chen
A novel recognition element of molecularly imprinted films (MIFs) was synthesized by wet phase inversion (WPI) on the surface of Ti/TiO 2 electrode for highly selective and sensitive electrochemical detection of bisphenol A (BPA). The Ti/TiO 2 /MIFs sensor was constructed by casting the precursor poly(acrylonitrile- co -acrylic acid) (p(AN- co -AA)) in dimethyl sulfoxide containing template molecule BPA onto the electrode and then immersing into water, resulting in simultaneous p(AN- co -AA) precipitation and BPA imprinting via the facile WPI. The imprinted sites could selectively rebind BPA through hydrogen bonding and hence lead to the equalizing current increase in amperometric detection, by which the BPA could be sensed electrochemically. Accordingly, the Ti/TiO 2 /MIFs sensor offered a favorable linearity within the wide range over five orders of magnitude (4.4 nM–0.13 mM), and a low detection limit down to 1.3 nM. Excellent recognition selectivity for BPA was also attained over its analogues. Furthermore, this sensor was successfully applied to detect BPA in seawater and paper cup samples, and high recoveries were 86–110% with low relative standard deviations of 1.3–3.2%. By using BPA as a model, the MIFs-based method may provide a facile, rapid, and cost-effective way for ultrasensitive electrochemical measurements of various targeted compounds with good applicability to WPI.
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高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 37
·5509-5517
·
IF 1.9
Keqin Deng,Xinyan Liu,Chunxiang Li,Zhaohui Hou,Haowen Huang
No work studied and compared Fe3O4-functionalized carbon-based nanomaterials. Also, no work investigated their application for detecting bisphenol A (BPA), an important organic chemical raw material, which had been proved to cause malformation, cancers, sexual precocity, and neural and behavioral changes in infants and children. In this work, Fe3O4 magnetite nanoparticles were stably anchored on carbon materials to synthesize three types of nanohybrids, i.e. hybrids of graphene oxide with Fe3O4 (GO–Fe3O4), carbon nanotubes with Fe3O4 (CNTs–Fe3O4), and graphene oxide and carbon nanotubes with Fe3O4 (GO–CNTs–Fe3O4). These nanohybrids were characterized using a transmission electron microscope (TEM), X-ray diffractometer (XRD), and Fourier transform infrared spectrometer (FT-IR). GO–Fe3O4, CNTs–Fe3O4, and GO–CNTs–Fe3O4 were immobilized on the surface of a GCE using electro-poly(glutamic acid). The electrochemical response characteristic of bisphenol A (BPA) on different modified electrodes was investigated by cyclic voltammetry. It showed that these three types of nanohybrids greatly enhanced the anodic peak current of BPA. Then, these hybrids were applied to determine BPA by differential pulse voltammetry. Their determination performance was compared with each other. Among them, the GO–CNTs–Fe3O4 modified electrode exhibited wider linear ranges of 0.003–0.2 and 0.2–30.0 μmol L−1 with a lower estimated detection limit of 1.0 nmol L−1.
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POLYMER COMPOSITES
·
2017
·Vol. 39
·期 10
·3705-3711
·
IF 2.324
Mehdi Derradji,Abdelkhalek Henniche,Jun Wang,Abdul Qadeer Dayo,Jia-hu Ouyang,Wen-bin Liu,Aboubakr Medjahed
A new kind of nanocomposites was prepared from a high performance phthalonitrile resin and Ti 3 SiC 2 MAX phase ceramic nanoparticles. The synergistic combination of both phases led to nanocomposites with improved thermal and mechanical properties. For instance, the thermal conductivity and tensile properties of the neat resin were highly enhanced on adding more nanofillers contents. Moreover, the phthalonitrile resin toughness was enhanced by 123% at the maximum nanoparticles loading of 15 vol.%. The experimental investigations were also compared with predictions from Series, Halpin-Tsai, and Kerner models and a full discussion was provided. A high resolution transmission electron microscope confirmed the ability of the MAX phase to create a conductive network, especially at high nanofillers amounts. SEM analyses of the tensile fractured surfaces revealed positive changes in the morphology, such as an increase in the roughness and amount of hackling as well as the formation of multiple micro-cracks. The MAX phase also enhanced the thermal stability, stiffness, and glass transition temperature of the neat resin. This work confirms the superiority of the MAX phase ceramics over the traditional ones in enhancing the properties of the phthalonitrile resin and opens the way for further research in the field. POLYM. COMPOS., 39:3705–3711, 2018. © 2017 Society of Plastics Engineers
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Panpan Diao,Qi Chen,Rui Wang,Dong Sun,Zhuoping Cai,Hao Wu,Shunshan Duan
Abtsract Three phenolic endocrine-disrupting compounds, 4-nonylphenol, 4-tert-octylphenol and bisphenol A, were determined in water, sediment and biota (fish, shrimp and mollusk) collected from sites along the Pearl River Estuary, China. The 4-nonylphenol, 4-tert-octylphenol and bisphenol A concentrations ranged from 1.20–3352.86 ng/L in the water, < 0.17–20.80 ng/g dw in the sediment and < 1.49–237.12 ng/g dw in the biota. The concentrations of 4-nonylphenol were higher than those of 4-tert-octylphenol and bisphenol A in the water, sediment and organisms. Moreover, the bioconcentration factors (BCFs) and biota-sediment accumulation factors (BSAFs) of 4-nonylphenol and bisphenol A were calculated, and were found to be higher for 4-nonylphenol and in demersal organisms. To assess co-exposure to phenolic endocrine-disrupting compounds, the 4-nonylphenol equivalent was employed to evaluate the potential risks to aquatic organisms and human health, and the results indicated a low risk.
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Analytical Methods
·
2016
·Vol. 8
·期 17
·3528-3535
·
IF 1.915
Xingli Liu,Tao Feng,Chenhuan Wang,Lin Hao,Chun Wang,Qiuhua Wu,Zhi Wang
In this work, a nanoporous carbon/iron composite material designated as MIL-53-C was fabricated by one-step carbonization of an Fe-based metal–organic framework material MIL-53. The obtained MIL-53-C showed a high Brunauer–Emmett–Teller surface area (249.33 m2 g−1), large pore volume (0.57 cm3 g−1) and an excellent magnetic property (127.95 emu g−1). It was used as a magnetic solid-phase extraction adsorbent for the enrichment of some endocrine disrupting compounds from fruit juice and milk samples followed by high-performance liquid chromatographic analysis. Under optimum conditions, a good linearity for all analytes over the studied concentration range was achieved with a correlation coefficient higher than 0.9995. The limits of detection, based on S/N = 3, were 0.05–0.10 ng mL−1 for fruit juice and 0.10–0.20 ng mL−1 for milk samples. The recoveries of spiked samples ranged from 92.2% to 108.3%. These results indicated that the MIL-53-C exhibited an excellent adsorption capability for trace levels of EDCs, and it may also be a promising adsorbent for extraction and enrichment of other organic pollutants.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 9
·7169-7183
·
IF 1.833
Liu Xingchen,Hu Yun,Huang Jing,Wei Chaohai
A surfactant structure-directing agent was used to synthesize a hydrophobic mesoporous material (MCM-41-d) at room temperature. As-prepared materials were characterized through X-ray diffraction (XRD) analysis, Fourier-transform infrared (FT-IR) spectroscopy, N 2 adsorption–desorption isotherm analysis, and thermogravimetry (TG). The properties of the samples for adsorption of bisphenol A (BPA) from water were also investigated in detail. The results revealed that pH affected BPA adsorption. Equilibrium and kinetic data were consistent with the Langmuir adsorption and second-order kinetic model, respectively. The adsorption capacity of MCM-41-d was considerably higher than that of MCM-41-c because of its higher hydrophobicity and more abundant adsorption sites. The maximum adsorption capacity of MCM-41-d was as high as 416.7 mg/g, indicating that MCM-41-d can serve as an efficient adsorbent to remove BPA from water.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Hao Wu,Xiaojun Niu,Jia Yang,Caihong Wang,Meiqing Lu
The retention efficiencies of bisphenol A (BPA) and norfloxacin (NOR) by three different ultrafiltration (UF) membranes prepared in laboratory were investigated, together with the influencing factors such as initial concentration, ionic strength, pH, membrane fouling and trans-membrane pressure (TMP). The results show that the effects of initial concentration and ionic strength on retentions is minor for both BPA and NOR. BPA retentions substantially decreased as pH value approached to its p K a value, and for NOR they first increased and decreased afterwards with pH change. The retentions are all improved after HA fouling because of the HA block in the membrane pores and the developed cake layer, and it can be concluded that between pollutants and HA there exists not only adsorption with each other but also competitive adsorption for sites on membranes. The retentions of both BPA and NOR decrease with increasing pressure. Generally, the effects of these factors on BPA and NOR retention are different and the retentions of the three UF membranes for NOR always remain at a low level, which needs further investigation.
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Environmental Science-Nano
·
2016
·Vol. 4
·期 2
·493-502
·
IF 5.896
Jialuo Yu,Xiaoyan Wang,Qi Kang,Jinhua Li,Dazhong Shen,Lingxin Chen
A novel molecular imprinting fluorescence nanosensor was constructed via a facile surface imprinting polymerization one-pot synthesis strategy for highly selective and sensitive recognition and detection of 4-nitrophenol (4-NP) based on an electron-transfer induced fluorescence quenching mechanism. 2-Aminoethyl methacrylate hydrochloride (AMA) was first used as a surfactant to interact with aqueous carboxyl-CdTe quantum dots (QDs) and the resultant AMA-modified QDs were used as a core support and a fluorescent signal source. Then, an ultrathin 4-NP imprinted shell (ca. 4 nm) was formed on the QD surface (i.e., QD@MIPs) by a simple facile free radical polymerization step. The one-pot synthesis simplified the imprinting process and shortened the experimental period. The imprinted sites bound the template of 4-NP efficiently through the hydrogen bonding interactions and showed excellent recognition selectivity for 4-NP over its analogues with a high imprinting factor of 9.1. The electron transfer process between QDs and 4-NP led to significant fluorescence quenching of the QD@MIPs nanosensor, by which 4-NP could be sensed, and high detection sensitivity up to 0.051 μM was attained. Furthermore, the sensor was successfully applied to determine 4-NP in seawater and lake water samples, presenting high recoveries in the range of 92.7–109.2% at three spiking levels with the relative standard deviation within 3.1–4.8%. The simple, rapid, reliable QD@MIPs-based method proved to be potentially applicable for the highly selective and sensitive fluorescence determination of trace 4-NP in complicated environmental water samples.
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