ELECTROANALYSIS
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2015
·Vol. 27
·期 12
·2718-2724
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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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Analytical Methods
·
2015
·Vol. 7
·期 12
·5186-5192
·
IF 1.821
Nuo Duan,Hui Zhang,Yu Nie,Shijia Wu,Tingting Miao,Jie Chen,Zhouping Wang
We report a method for trace detection of bisphenol A (BPA) based on fluorescence resonance energy transfer (FRET) between lanthanide-doped KGdF4 nanoparticles (KGdF4:Tb3+ NPs) as a donor, and gold nanoparticles (AuNPs) that act as an acceptor. The KGdF4:Tb3+ NPs were modified with an aptamer recognizing BPA, and AuNPs were modified with the complementary DNA (cDNA) of the aptamer. The donor–acceptor pair was fabricated by hybridizing the aptamers and their cDNA. Thus, fluorescence of the KGdF4:Tb3+ NPs could be quenched due to the good overlap between the KGdF4:Tb3+ NP fluorescence emission and the AuNP absorption spectrum. However, on addition of BPA, the aptamers preferentially bound to BPA, forming KGdF4:Tb3+ NP–aptamer–BPA complexes. As a result, the FRET was disrupted, and the fluorescence was restored. The recovered fluorescence of the KGdF4:Tb3+ NPs was linearly proportional to the concentration of BPA in the range of 0.5 to 100 ng mL−1, with detection limits as low as 0.16 ng mL−1. The assay was applied to real samples, and the results were consistent with the results obtained using high performance liquid chromatography (HPLC) methods. We presume that this strategy can be extended to the detection of other contaminants by simply substituting the aptamer.
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JOURNAL OF HAZARDOUS MATERIALS
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2015
·
IF 4.529
Zailin Gong,Shujin Li,Jun Ma,Xiangdong Zhang
The commercial powdered activated carbon (PAC) has been selectively oxidized by two methods. The two oxidized methods are wet oxidation with ammonium persulfate and thermal treatment after acidification with hydrochloride acid, respectively. The two oxidized PAC were then functionalized with thermoresponsive poly ( N -isopropylacrylamide) (PNIPAM) in aqueous solution at ambient temperature. Comparing the two oxidized PAC products and their grafted derivatives, the oxidized PAC modified with thermal treatment after acidification shows larger surface area of 1184 m 2 /g and better adsorption of bisphenol A. Its derivative also exhibits relatively large surface area and adsorption capacity after grafted with PNIPAM. The maximum surface adsorption capacity simulated under Langmuir Models reached 156 mg/g. In addition, the grafted PAC products show self-flocculation behaviors with rapid response to temperature because of the thermal phase transition and entanglement behaviors of PNIPAM. The present study provides a new way to obtain carboxyl-rich activated carbon with large surface area and better adsorption capacity. The retrievable grafted PAC with good self-flocculation effect responsive to temperature will have high potential application in water remediation which requires pre-heating and emergency water treatment in the wild.
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ENVIRONMENTAL POLLUTION
·
2015
·
IF 4.143
Dong Zhou,Jie Yang,Hui Li,Qiang Lu,Yong-di Liu,Kuang-fei Lin
In order to understand how bisphenol A (BPA) exposure acts on the evolutionary dynamics of populations and changes of stress response across generations, the model animal Caenorhabditis elegans was used to conduct the multigenerational testing. Multiple endpoints at the physiological (growth, reproduction, and locomotion behaviors) and molecular (stress-related gene expressions) levels were examined by multigenerational exposure to low-concentration BPA (0.001–10 μM) across four generations. The results showed that changes of physiological-level effects across four generations varied in magnitude and direction, depending on the exposure concentrations. C. elegans individuals in the first generation grew smaller, moved slower, and produced less offsprings than the controls by BPA exposure. As for each trait tested, the first generation response could be commonly mirrored in the subsequent generations at the highest concentration of 10 μM. However, at lower concentrations, response of parental generation was a relatively poor predictor of the effects on progeny, as acclimation or cumulative damage could occur in the subsequent generations. The integrated gene expression profiles visually illustrated that the tested gene expressions at low concentrations (0.001–0.01 μM) were more obviously changed in both G 1 and G 4 generations, and the G 1 generation showed a much greater degree of increase in stress-related gene expressions than the G 4 generation. The multigenerational toxicity data emphasize the need of considering biological effects over multiple generations to conduct accurate assessment of environmental risks of toxicants on population dynamics.
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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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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2015
·Vol. 19
·期 6
·1571-1578
·
IF 2.446
Zhao Jia,Ma Yanhui,Hou Xiaodong,Li Liqing,Zheng Peifeng,Li Chunya
A novel 1-[3-(tert-butoxycarbonylamino)propyl]-3-[3-(N-pyrrole)propyl]imidazolium tetrafluoroborate ionic liquid was successfully synthesized and was used as functional monomer to electrochemically fabricate a polymer film modified glassy carbon electrode (Poly-IL/GCE). Morphology and the interfacial property of Poly-IL/GCE were examined with scanning electron microscope and electrochemical impedance spectroscopy, respectively. Bisphenol A (BPA) was chosen as a model compound to investigate the sensing performance of Poly-IL/GCE using voltammetry. The oxidation peak currents of BPA at the Poly-IL/GCE exhibit a linear response to its concentration in the range of 1.0 × 10 –8 –1.0 × 10 –5 M. The detection limit is calculated to be 4.0 × 10 –9 M (S/N = 3). The Poly-IL/GCE was successfully applied to analysis BPA leaching from drinking water bottle. The results are consistent with that of high-performance liquid chromatography.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Chenhuan Wang,Qianqian Wang,Kaiyuan Si
The extensive presence of phenolic organic contaminants (POCs) poses a serious threat to humans. Meanwhile, the upcycling/reusing of waste polystyrene to reduce the exponential growth of plastic pollution is a very important environmental issue. Addressing these demands, a series of carboxyl-functional hypercrosslinked polymers (labeled PP-HCPs) were constructed by knitting waste polystyrene with pyromellitic dianhydride at different ratios through a one-step Friedel-Crafts reaction for effective adsorption of POCs. Among the prepared PP-HCPs, PP-HCP2 displayed a large specific surface area with high adsorption capacity (37.3 mg g −1 ) for POCs. Using PP-HCP2 as solid phase extraction sorbent, six POCs were effectively extracted from water and peach drink samples, then subjected to high-performance liquid chromatography-ultraviolet detection. The method demonstrated good linearity in the range of 0.03–100.0 ng mL −1 for water samples and 0.06–100.0 ng mL −1 for peach drinks under optimum experimental conditions. At a signal-to-noise ratio of 3, low detection limits were found to be 0.01–0.10 ng mL −1 for water samples and 0.02–0.15 ng mL −1 for peach drinks. Good accuracy and repeatability were achieved with recoveries of 85.3–111.8 % and the relative standard deviations below 8.6 %. The PP-HCP2-based approach can be employed as a dependable and sensitive tool to detect POCs in water and peach drink samples. This work delivers a simple and economically viable approach to fabricate carboxyl-functional HCPs by converting waste foam into high-value-added sorbent, with great significance for sustainable development.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Guijiao Zhao,Chenhuan Wang,Min Kang,Lin Hao,Weihua Liu,Zhi Wang,Xiaodong Shi,Qiuhua Wu
Developing effective methods for highly sensitive detection of phenolic endocrine disruptors (EDCs) is especially urgent. Herein, a magnetic hydroxyl-functional porous organic polymer (M-FH-POP) was facilely synthesized by green diazo-couple reaction using basic fuchsin and hesperetin as monomer for the first time. M-FH-POP delivered superior adsorption performance for phenolic EDCs. The adsorption mechanism was hydrogen bonds, hydrophobic interaction and π-π interplay. With M-FH-POP as adsorbent, a magnetic solid phase extraction method was established for extracting trace phenolic EDCs (bisphenol A, 4- tert -butylphenol, bisphenol F and bisphenol B) in water and fish before ultra-high performance liquid chromatography tandem mass spectrometry analysis. The method displayed low detection limit (S/N = 3) of 0.05–0.15 ng mL −1 for water and 0.08–0.3 ng g −1 for fish. The spiked recoveries were 88.3 %–109.8 % with the relative standard deviations of 2.4 %–6.4 %. The method offers a new strategy for sensitive determination of phenolic EDCs in water and fish samples.
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MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Mengyou Zhou,Qiuyun Li,Shuxian Zhong,Jianrong Chen,Hongjun Lin,Xi-Lin Wu
In this work, a scalable and cost-effective approach was developed for the synthesis of magnetic carbon nano-onions (MCNOs) by using iron (III) acetylacetonate modified candle as the raw materials. The candle soot was collected from the burning candle and then subjected to calcination at 800 °C under N 2 atmosphere. The obtained MCNOs were further applied as adsorbent for the removal of bisphenol A (BPA) from aqueous solutions. Adsorption of BPA onto the MCNOs was investigated with the influence of initial concentration of BPA, solution pH, and adsorption time. The results demonstrated the adsorption of BPA onto the MCNOs was almost not affected by pH in the range from 5–9. The adsorption isothermal and kinetic's data were better fitted by Langmuir isotherm and pseudo-second-order kinetic model, respectively. Moreover, the MCNOs are easily recycled by using and external magnet and regenerated by simply methanol washing. The results present here not only provide a novel synthetic approach toward low-cost nanocarbons but also revealed the great application potential of the MCNOs for the removal of endocrine disrupting compounds from aqueous solution.
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JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Guangying Hou,Rui Zhang,Xiaoyan Hao,Chunguang Liu
An increasing amount of bisphenol A (BPA) is being produced and used, then discharged into sewage treatment plants and accumulated in sludge or soil, when the sludge is used as fertilizer. Accumulation of BPA in sludge or soil causes poisoning to the enzyme, which affects the biological treatment of sludge and the circulation and conversion of materials in soil. In this research, effect of BPA on sludge hydrolysis is studied from the respect of concentration and components of soluble organic matter in sludge, using three-dimensional fluorescence spectra. In order to illuminate the interaction mechanism, toxic effect of BPA on α-Amylase (a model of hydrolase in sludge) is investigated with multi-spectra, isothermal titration microcalorimetry and molecule docking at the molecular level. Results show that the secondary structure of α-Amylase and the microenvironment of amino acid residue in α-Amylase are changed. The molecular docking study and ITC results show that hydrophobic bond and hydrogen bond exist in the interaction between BPA and α-Amylase. Based on the above analysis and enzyme activity assay, sludge hydrolysis is inhibited due to the denaturation of α-Amylase with BPA exposure.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Jie Ding,Zan Dai,Fan Qin,Huiping Zhao,Shuai Zhao,Rong Chen
To solve serious energy and environmental crises caused by rapid industrial development, Z-scheme photocatalytic system provides a potential strategy to as ideal photocatalyst with wide absorption range, high charge-separation efficiency and strong redox ability. In this work, we develop a facile time-dependent method to fabricate Z-scheme BiO 1-x Br/Bi 2 O 2 CO 3 photocatalyst with rich oxygen vacancies for visible light photocatalysis , which exhibits highly enhanced performance for antibiotics (CIP, 4-MAA etc.) photodegradation . A possible mechanism of the improved photocatalytic efficiency based on the Z-scheme photocatalytic system formed via oxygen vacancy is also proposed. Oxygen vacancies, acting as electron mediator, could significantly promote the separation of photoinduced charge carriers. Due to the increase of redox ability, it benefits to the production of superoxide radical ( O 2 − ) on the CB of BiO 1-x Br and hydroxyl radical ( OH) on the VB of Bi 2 O 2 CO 3 , respectively. This work demonstrates that a simple oxygen vacancy involved Z-scheme photocatalytic system could efficiently enhance the photocatalytic activity for the degradation of pollutants.
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