CHEMOSPHERE
·
2018
·
IF 4.427
Bin Deng,Yating Li,Weihua Tan,Zhaoxi Wang,Ziwei Yu,Shuya Xing,Heng Lin,Hui Zhang
Mn-Zn ferrite (Mn 0.6 Zn 0.4 Fe 2 O 4 ) was prepared by a gel method using spent alkaline Zn-Mn batteries as raw materials and employed as catalyst to degrade bisphenol A (BPA) by electro-enhanced heterogeneous activation of peroxydisulfate (PDS). The effects of initial pH, current density, PDS concentration, and Mn-Zn ferrite dosage on BPA removal were investigated. The formation of reactive radicals was verified by electron paramagnetic resonance (EPR) spectroscopy. The results of radical quenching experiments indicate that surface-bound sulfate and hydroxyl radicals played an important role in BPA removal. The stability of Mn 0.6 Zn 0.4 Fe 2 O 4 catalyst was investigated by cycling experiments, which indicates Mn 0.6 Zn 0.4 Fe 2 O 4 is stable and can be reused. This work also provides an alternative way for the reutilization of spent alkaline Zn-Mn batteries.
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PubMed
高影响因子
CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 5
·749-758
·
IF 1.401
Yin Dan,Chen Yanlong,Zhang Yanhao,Yang Zhicong,Mao Hongyan,Xia Shaige,Zhang Wenfen,Zhao Wuduo,Zhang Shusheng
Abstract A rapid and effective solid-phase extraction high-performance liquid chromatography fluorescence detection (SPE-HPLC–FLD) method, using a novel porous aromatic framework (PAF-6) as solid-phase extraction sorbent, was established to enrich and determine bisphenol (BPA) in milk and its packing samples. Parameters influencing the extraction efficiency, such as volume of the sample solutions, pH of the sample, and the eluent volume, were examined. The limits of detection and quantitation were 0.1 and 0.33 ng mL −1 , respectively. The recovery of the method was desirable at 81–91% and the relative standard deviation was less than 2.35%. Besides, the PAF-6-based cartridges exhibited superior reusability for milk sample analysis. In addition, theoretical computations were performed to further understand the molecular interaction mechanism between the PAF-6 and the BPA. The results showed that PAF-6 had an excellent adsorption capability for BPA based on hydrogen bonding and the inclusion interactions of host–guest. The proposed method is sensitive, simple, and cost-saving, and provides a detection platform for the monitoring of BPA residues in real milk samples. Graphical Abstract
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·6770-6777
·
IF 3.201
Kai Luo,Shi-Xi Zhao,Yi-Feng Wang,Shu-Jin Zhao,Xi-Hui Zhang
Petal-like δ-MnO2 microspheres were successfully synthesized by a very simple hydrothermal method with potassium permanganate (KMnO4) as the only raw material. By adjusting the initial concentration of KMnO4 solution and the time of the hydrothermal reaction, the morphology and crystallinity of δ-MnO2 can be controlled. The synthesized δ-MnO2 microspheres were characterized by XRD, SEM, TEM, TG/DSC, BET, ICP-AES and XPS. The catalytic ozonation performance of δ-MnO2 prepared by a hydrothermal reaction at 160 °C for 24 h using 0.1 mol L−1 KMnO4 solution was tested. Its catalytic activity is excellent. The degradation efficiencies of bisphenol A and ibuprofen using 0.1 g L−1 δ-MnO2 as the catalyst were 68.2% and 68.5% in 20 min reaction time. The results were much better than those of individual ozone treatment and with commercial MnO2 as the catalyst. The formation of hydroxyl radicals was not the main reason for the rapid degradation of organic compounds in the catalytic reaction with δ-MnO2 as the catalyst. The strong interaction among the catalyst surface, ozone and organic molecules was the important reason for catalysis based on the related experimental results.
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高影响因子
ELECTROANALYSIS
·
2015
·Vol. 28
·期 3
·439-444
·
IF 2.138
Jinying Sun,Yang Liu,Simin Lv,Zhirong Huang,Liao Cui,Tie Wu
In this paper, bisphenol A was determined by electrochemical method at a nitrogen-doped carbon nanofiber modified carbon paste electrode (NCNF/CPE) with high sensitivity and good selectivity. NCNF was obtained by a simple electrospinning followed by carbonization procedure, in which polyacrylonitrile (PAN) as precursor and nitrogen doping was realized by re-utilizing the tail gas that produced in the thermal pretreatment process. Good reproducibility and high stability were obtained for BPA detection at NCNF modified CPE. Current response plotted with BPA concentration was linear in the range of 0.1–60 μM with LOD of 0.05 μM. The proposed electrochemical sensor was employed for BPA determination with satisfactory recoveries for real water samples, indicating the practical applicability of NCNF/CPE.
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高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2015
·Vol. 32
·期 8
·703-712
·
IF 0.991
Ni Liang,Di Zhang,Chaoxian Wei,Hao Li,Saikat Ghosh,Yanbei Cao,Binglin Guo
Organo-mineral complexes are important components of soil and can greatly affect the behavior and fate of organic contaminants. Properties of organic components play important roles in organic coating on mineral surfaces. However, the dominant property and mechanism controlling organic contaminant behavior are still unclear. In this study, adsorption of various organic contaminants on humic acid-nano-Fe2O3 complexes with different properties were investigated. Nonpolar, aromatic, and high-molecular-weight fractions of humic acid (HA) were preferentially adsorbed on nano-Fe2O3, forming various HA-nano-Fe2O3 complexes with different properties. According to a correlation analysis between the adsorption of organic contaminants and properties of HA-nano-Fe2O3 complexes, the organic carbon content, aromaticity, and hydrophobicity, were believed to be the dominant properties controlling the organic contaminant adsorption. Organic carbon contents and π-π bonds might contribute to sulfamethoxazole (SMX) adsorption more than to bisphenol A (BPA) and phenanthrene (PHE) adsorption because the amino functional groups and N-heteroaromatic rings of SMX were strong π-acceptors. In comparison, hydrophobic interactions might contribute to BPA and PHE adsorption more than to SMX adsorption due to the higher hydrophobicity of BPA and PHE. The H-bond was not the dominant mechanism responsible for PHE and BPA adsorption, while it could not be ignored for SMX adsorption.
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高影响因子
ANALYTICAL LETTERS
·
2015
·
IF 1.03
Shuangqiao Ju,Yaling Yang,Mousheng Liu
A method for magnetic solid-phase extraction was developed for the preconcentration of bisphenol A, bisphenol AF, tetrabromobisphenol A, and 4-tert-octylphenol from food containers and packaging materials. Cetyltrimethylammonium bromide was added to a solution of magnetic nanoparticles to enhance adsorption of the analytes prior to high-performance liquid chromatography. The effects of the amount of surfactant, the amount of magnetic nanoparticles, the pH, the adsorption time, the desorption solution, and the reuse of the extractant were optimized. The linear dynamic ranges were from 0.05 to 25 milligrams per liter. The limits of detection were between 1.21 and 2.48 micrograms per liter, the limits of quantification were from 4.03 to 8.27 micrograms per liter, and the relative standard deviations were between 2.2 and 4.1 percent. This magnetic solid-phase extraction approach was successfully employed for the analysis of plastics with recoveries from 88.0 to 101.1 percent and relative standard deviations between 2.3 and 5.4 percent.
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高影响因子
ELECTROANALYSIS
·
2015
·Vol. 27
·期 12
·2718-2724
·
IF 2.138
Xupeng Yan,Chuqing Zhou,Yan Yan,Ye Zhu
A sensitive and simple electrochemical sensor based on nanoporous gold (NPG) was developed for the detection of bisphenol A (BPA). NPG was prepared by the dealloying method. The NPG modified glassy carbon electrode (GCE) displayed excellent catalytic activity towards the electrooxidation of BPA. The mechanism of the electrooxidation of BPA on NPG/GCE sensor was inferred. The sensor showed a linear range from 0.1 μM to 50 μM with a detection limit of 12.1 nM BPA. Specially, a simple but effective approach was attempted to renew the used sensor. The application of the sensor for real sample analysis was demonstrated.
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高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 10
·4246-4251
·
IF 1.821
Pinong Huang,Suqing Zhao,Sergei A. Eremin,Shengwu Zheng,Dan Lai,Yingshan Chen,Bin Guo
Based on a sensitive monoclonal antibody against bisphenol A (BPA) and a new tracer named BVA–AMF, a homogeneous fluorescence polarization immunoassay (FPIA) was developed and applied in the determination of bisphenol A in environmental water samples. BVA was selected as the hapten to couple with bovine serum albumin and the conjugate was used as the immunogen for the monoclonal antibody production. Three fluorescein-labeled BVA tracers with different structures (BVA–AMF, BVA–EDF, and BVA–lysFITC) were synthesized. Under the same optimal conditions, BVA–AMF showed the highest sensitivity for FPIA and the detection of BPA exhibited a limit of detection of 5.60 ng mL−1, an IC50 of 140 ng mL−1 and a dynamic range of 11.32–904.21 ng mL−1 approximately. In this assay, several similar compounds were shown of little significantly with the cross-reactivity being less than 0.15%. Four different kinds of water samples were analyzed, with recoveries being 87.91–114.28%. The detection standard curve of BPA exhibited a good linearity (R2 = 0.9913, n = 3). Compared with ELISA and HPLC methods, FPIA showed reliability and a high correlation with ELISA of 0.9964 and HPLC of 0.9971. The proposed immunoassay technique is suitable for detection of BPA in authentic environmental water samples.
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高影响因子
CHEMOSPHERE
·
2014
·
IF 3.499
Cong Li,Zilong Wang,Y. Jeffrey Yang,Jingqing Liu,Xinwei Mao,Yan Zhang
Halogenations of bisphenol A (BPA) in a pilot-scale water distribution system (WDS) of a cement-lined ductile cast iron pipe were investigated. The water in the pilot-scale WDS was chlorinated with a free chlorine concentration of 0.7 mg L −1 using sodium hypochlorite, and with an initial BPA concentration of 100 μg L −1 was spiked in the WDS. Halogenated compounds in the BPA experiments were identified using EI/GC/MS and GC . Several BPA congeners, including 2-chlorobisphenol A (MCBPA), dichlorobisphenol A (D 2 -CBPA), 2,2′,6-trichlorobisphenol A (T 3 CBPA), 2,2′,6,6′-tetrachlorobisphenol A (T 4 CBPA), 2-bromobisphenol A (MBBPA), and bromochlorobisphenol A (MBMCBPA) were found. Moreover, further halogenation yielded other reaction intermediates, including 2,4,6-trichlorophenol (T 3 CP), dichlorobisphenol A, bromodichlorophenol, and dibromochlorophenol. After halogenation for 120 min, most of the abovementioned reaction intermediates disappeared and were replaced by trihalomethanes (THMs). Based on these experimental findings, the halogenation process of BPA oxidation in a WDS includes three stages: (1) halogenation on the aromatic ring; (2) chlorine or bromine substitution followed by cleavage of the α-C bond on the isopropyl moiety with a positive partial charge and a β′-C bond on the benzene moiety with a negative partial charge; and (3) THMs and a minor HAA formation from phenolic intermediates through the benzene ring opening with a chlorine and bromine substitution of the hydrogen on the carbon atoms. The oxidation mechanisms of the entire transformation from BPA to THM/HAA in the WDS were proposed.
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高影响因子
RSC Advances
·
2014
·Vol. 5
·期 14
·10611-10618
·
IF 3.708
Jinhua Li,Ruichen Dong,Xiaoyan Wang,Hua Xiong,Shoufang Xu,Dazhong Shen,Xingliang Song,Lingxin Chen
A facile strategy was developed to prepare magnetic molecularly imprinted microspheres (MMIMs) for the selective recognition and effective removal of 17-beta-estradiol (17β-E2) by reversible addition-fragmentation chain transfer precipitation polymerization. One-pot synthesis was employed, which could simplify the imprinting process and shorten the experimental period. The resultant MMIMs displayed fast kinetics and high binding capacity, and the adsorption processes followed Langmuir–Freundlich isotherm and pseudo-second-order kinetic models. Excellent recognition selectivity toward 17β-E2 was attained over other phenolic estrogens such as 17-alpha-E2, estriol and estrone. The magnetic property of MMIMs provided fast and simple separation, and the recycling process for magnetic solid phase extraction (MSPE) was sustainable at least five times without obvious efficiency decrease. Furthermore, the MMIMs-MSPE presented satisfactory recoveries within 71.7–108.3% with the precisions of 1.1–6.0% for spiked 17β-E2 in water, soil and food samples. The developed MMIMs-based method proved to be a convenient and practical way in sample pretreatment and targeted pollutants removal.
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高影响因子
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
MICROCHIMICA ACTA
·
2013
·Vol. 180
·期 5
·341-346
·
IF 3.434
Hou Fang,Deng Ting,Jiang Xinyu
We have developed a simple and efficient method for dispersive liquid-liquid microextraction of 4-nitrophenol, 2-naphthol and bisphenol A in real water samples. It is making use of solidified floating organic droplets of 1-dodecanol which has low density and a proper melting point. The type and volume of extraction solvent and dispersive solvent, the effect of salts, pH value and extraction time were optimized and resulted in enrichment factors of 84 for 4-nitrophenol, 123 for 2-naphthol, and 97 for bisphenol A. The limits of detection by HPLC are 1.50, 0.10 and 1.02 ng · mL −1 , respectively. Excellent linearity is observed in the concentration range from 10 to 800 ng · mL −1 , with coefficients of correlation ranging from 0.9988 to 0.9999. The relative standard deviations (for n = 5) are from 3.2 to 5.3 %, and relative recoveries for the three phenols in tap, river and spring water range from 85.0 to 105.0 %, 98.3 to 110.0 %, and 98.6 to 109.0 %, respectively.
Chromatograms of river water blank (b) and spiked river water (a, 500 ng ∙ mL −1 ) analyzed with DLLME-SFO-HPLC. Peak identification: (1) p-nitrophenol; (2) 2-naphthol; (3) bisphenol A. Liquid-liquid microextraction method based on solidification of floating organic droplet (DLLME-SFO) has a high enrichment factor (84, 123and 97), acceptable relative recovery (85.0 %–110.0 %), good repeatability (5.27 %, 3.54 % and 3.16 %) and a wide linear range (10–800 ng · mL −1 ) for the determination of p-nitrophenol, 2-naphthol and bisphenol A.
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