SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Zhiping Zhou,Tao Li,Wanzhen Xu,Weihong Huang,Ningwei Wang,Wenming Yang
In this paper, based on Mn doped ZnS quantum dots (QDs) and by anchoring a MIPs layer on the surface of SiO 2 nanoparticles, the novel fluorescence molecularly imprinted polymers (SiO 2 @QDs@MIPs) were successfully synthesized by precipitation polymerization, with acrylamide (AM) as the functional monomer and ethyl glycol dimethacrylate (EGDMA) as the cross-linker. The prepared SiO 2 @QDs@MIPs were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermo gravimetric analysis (TGA) and fluorescence spectroscopy. The products show excellent optical properties and molecular recognition ability of molecularly imprinted polymers. It can recognize sensitively and selectively the template molecules, dibutyl phthalate (DBP). Under optimized experiment conditions, the fluorescence intensity decreases linearly with increasing concentration of DBP. in the range of 5–50 μmol L −1 , with a correlation coefficient of 0.9974. Furthermore, the SiO 2 @QDs@MIPs were successfully applied to analysis of tap water sample, and the average recovery rate of DBP at three spiking levels is more than 97.80%, with RSD below 3.25%. This study provides a promising strategy to fabricate fluorescent molecular imprinting polymer with highly selective recognition ability.
研究领域:
材料科学
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环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Qihan Meng,Lei Wang,Fei Chen,Qingfei Hao,Xudong Sun
Ramsdellite-type Li 2 Ti 3 O 7 (R-Li 2 Ti 3 O 7 ) hollow microspheres were successfully prepared for the first time by the flame melting method. The hollow microspheres are 50-120 μm in diameter and about 10 μm in shell thickness. The spherical morphology allows for a high tapping density (1.25 g cm −3 ), and the hollow structure increases the specific surface area which is beneficial to the electrochemical properties. Thus, the prepared R-Li 2 Ti 3 O 7 shows excellent electrochemical properties even at high tapping densities. A specific capacity of 212.1 mAh g −1 can be obtained at a rate of 0.1 C, and the capacity retention after 500 cycles at 1 C is 94.6% with a specific capacity of 150.3 mAh g −1 . The flame melting method is effective for the preparation of Li 2 Ti 3 O 7 hollow spheres which showed good performance as the anode for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 15
·6026-6036
·
IF 3.288
Yahui He,Sihui Hong,Miao Wang,Jing Wang,A. M. Abd El-Aty,Jing Wang,Ahmet Hacimuftuoglu,Majid Khan,Yongxin She
Herein, a molecularly imprinted membrane chromatography strip using a combination of electrospinning, molecular imprinting, and fluorescent lateral flow test strips (LFTS) was developed for specific recognition of triazophos residues in tap water. A molecularly imprinted T-line (detection) was prepared on a nitrocellulose (NC) membrane by an electrospinning technique, and goat anti-mouse IgG antibody (C-line) was used as a quality control line for the strip. Subsequently, a triazophos hapten-murine IgG/fluorescein isothiocyanate conjugate (THBu–IgG–FITC) was synthesized. The rapid detection of triazophos residues was established based on fluorescence changes generated by direct competition between the THBu–IgG–FITC fluorescent probe and target triazophos on the molecularly imprinted binding sites. Parameters including the spinning solution, electrospinning conditions, surfactant, molecularly imprinted polymer (MIP) concentration, concentration of the fluorescent probe, and competition mode were optimized. The developed method showed good linearity (R2 = 0.9906) over the concentration range of 20–500 μg L−1 with a limit of detection (LOD) of 20 μg mL−1 in tap water samples. The whole detection procedure could be accomplished within 18 min. In sum, the electrospun membrane with a MIP is extremely stable to fix the recognition element of lateral flow test strips and could provide a new strategy for rapid detection of pesticide residues.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Qian Lin,Yujing Sha,Bote Zhao,Yubo Chen,Moses O. Tadé,Zongping Shao
Cobalt oxides are attractive alternative anode materials for next-generation lithium-ion batteries (LIBs). To improve the performance of conversion-type anode materials such as cobalt oxides, well dispersed and nanosized particulate morphology is typically required. In this study, we describe the in situ electrochemical generation of cobalt oxide nanosheets from commercial micrometer-sized LiCoO 2 oxide as an anode material for LIBs. The electrode material as prepared was analyzed by XRD, FE-SEM and TEM. The electrochemical properties were investigated by cyclic voltammetry and by a constant current galvanostatic discharge–charge test. The material shows a high tap density and promising anode performance in terms of capacity, rate performance and cycling stability. A capacity of 560 mA h g −1 is still achieved at a current density of 1000 mA g −1 by increasing the amount of additives in the electrode to 40 wt%. This paper provides a new technique for developing a high-performance conversion-type anode for LIBs.
研究领域:
材料科学
·
电化学
·
纳米科技
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能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Libo Li,Bainian Chen,Lijun Luo,Xiaohong Liu,Xiaoya Bi,Tianyan You
In the present study, a novel self-enhanced electrochemiluminescence (ECL) aptasensor which combined self-enhanced ECL composite as signal response element and aptamer as the specific recognition element was firstly proposed for the sensitive and selective detection of Hg 2+ . Innovatively, the luminophore Ru(bpy) 3 2+ -doped silica nanoparticles functionalized with 3-aminopropyltriethoxysilane (NH 2 – [email protected] 2 ) and the co-reactant nitrogen doped graphene quantum dots (NGQDs) were bound together to form the self-enhanced ECL composite, NH 2 – [email protected] 2 -NGQDs, by electrostatic adsorption. Satisfactorily, high and stable luminous efficiency of NH 2 – [email protected] 2 -NGQDs was obtained benefited from the short electron transfer distance and low energy loss of self-enhanced-typal ECL composite. For the fabrication of the self-enhanced ECL aptasensor for Hg 2+ detection, the Hg 2+ aptamer, of which one end was connected to NH 2 – [email protected] 2 -NGQDs, and the other end was fixed on glass carbon electrode (GCE) surface through Au–S bond, was served as a bridge. Upon the addition of Hg 2+ , the aptamer was bent due to the formation of thymine-Hg 2+ -thymine (T-Hg 2+ -T) specific structure, which caused the self-enhanced ECL composite was close to the GCE surface. On this basis, a linearly enhanced ECL signal was acquired with the concentration of Hg 2+ in the range of 5.0 × 10 −11 M − 1.0 × 10 −6 M with excellent selectivity , repeatability and stability in 3 min for each assay. In addition, the proposed aptasensor showed satisfying accuracy and practicability for Hg 2+ analysis in tap and canal water verified by the inductively coupled plasma-mass spectrometry (ICP-MS) method.
研究领域:
分析化学
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环境科学
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纳米技术
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaoyang Shi,Decai Liu,Lei Chen,Yingzi Lin,Ming-Lai Fu,Wenjie Sun,Baoling Yuan
Currently, polypropylene (PP) and granular activated carbon (GAC) are widely used as the filters in point-of-use devices (POUs). However, the effect of biofilms formation in aged filters and subsequent formation/removal of disinfection byproducts (DBPs) during the use of POUs on purifying tap water remains unclear. In this study, the influence of filter replace event and filter usage time on the removal of DBPs by pristine or aged filters, such as trihalomethanes (THMs) and haloacetic acids (HAAs), was investigated. Additionally, the effect of biofilms-attached PP filters and GAC filters on DBPs concentration in treated water was explored. The results showed that POUs effectively removed over 60% of THMs and HAAs from tap water, while the removal efficiency decreased with the operation time. The increase in usage time of PP filters led to elevated levels of DBPs. Moreover, the pristine pre-GAC filters removed 12.31% of THMs and 6.62% of HAAs, respectively, while aged GAC filters enhanced the removal of HAAs. SEM and high-throughput sequencing analysis confirmed the attached growth of biofilms on aged PP and GAC filters. The biofilms growth on PP filters led to the formation of THMs and HAAs, and the formed DBPs increased with increasing influent chlorine concentration, lengthened filters usage time and stagnation time. Nevertheless, the DBPs in effluent of biofilms-attached GAC filters increased with increasing influent chlorine concentration and filter usage time while decreased with stagnation time. These results indicated that growth of biofilms commonly observed in filters of POUs leads to the formation of DBPs and increases the risk of DBPs exposure to users of POU devices.
研究领域:
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2017
·
IF 0
Zhen-Dong Huang,Ting-Ting Zhang,Hao Lu,Titus Masese,Kentarou Yamamoto,Rui-Qing Liu,Xiu-Jing Lin,Xiao-Miao Feng,Xian-Ming Liu,Dan Wang,Yoshiharu Uchimoto,Yan-Wen Ma
Titanium based compounds, such as TiO 2 , Li 5 Ti 4 O 12 and Na 2 Ti n O 2n+1 (where n = 3–8), have been pursued intensively for high energy and high power sodium and lithium ion batteries (NIBs and LIBs). Beside high rate and long life, the relatively higher capacity, higher tap density, scalable preparation process and low production cost are also essential factors for promising anode materials to progress from laboratory scale to pilot scale and finally to commercially scale up. Therefore, a dual-metal-organic crystal derived NiTiO 3 mesoporous micro-prism is developed by a scalable and unique self-assembly process. The interesting assembling mechanism is also clearly discussed based on the colour and microstructure evolutions of the reaction solution at different stage. The obtained NiTiO 3 hexagonal micro-prism features interconnected grain-boundary-rich and mesoporous structure, endowing highly conductive path for charge transportation and shortcut for ion diffusion. Together with a high tap density (2.5 g cm −3 ), this anode materials can deliver a high capacity of 373 and 562 mAh g −1 with superior rate and capacity retention for both sodium and lithium ion storage, respectively. It is also noteworthy that even after cycling for 1000 cycles at 5000 mA g −1 , the capacity retention ratio is maintained at 44.3% and 60.4% for sodium and lithium ion storage, respectively. The superior electrochemical properties , coupled with the low cost, dense structure and the scalable preparation method, will bring NiTiO 3 micro-prism to the fore as a promising contender anode material for long durability and high power compact NIBs and LIBs.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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无机非金属材料
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电池技术
·
功能材料
✓ 已验证
DOI
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Teng-Wen Zhao,Han Wu,Yang Jin,Xie-Yin Li,Gui-Fu Zuo,Man-Man Wang
Development of sensitive monitoring method for environmental contaminants is of great interest in both environmental science and analytical chemistry. Here we report the facile hydrothermal fabrication of ordered mesoporous graphitic carbon nitride/cobalt ferrite composite (MCN/CoFe 2 O 4 ) with large surface area and adequate magnetic property. The prepared MCN/CoFe 2 O 4 was developed as an adsorbent for magnetic solid-phase extraction for bisphenols (bisphenol F, bisphenol A and bisphenol AF) prior to HPLC coupled with variable wavelength detector. The factors influencing the extraction procedure, adsorption kinetics , isotherms and thermodynamics were investigated in detail. The extraction performed with 20 mg of MCN/CoFe 2 O 4 sorbent in 15 mL of sample solution was accomplished within only 15 min and gave the enrichment factors of 123.6–154.6. Meanwhile, the adsorption process followed the pseudo-second-order kinetic and Freundlich models. Under the optimized conditions, the method provided the limits of detection ( S/N = 3) and limits of quantification ( S/N = 10) of 0.15–0.25 μg/L and 0.50–0.90 μg/L, and the recoveries of 80.5%−104.0%. Moreover, the adsorbent was stable enough after 16 adsorption-desorption cycles. The developed approach not only presented an alternative strategy for sensitive and rapid determination of bisphenols in environmental water samples, but also promoted the synthesis and application of MCN in the field of sample pretreatment .
研究领域:
环境科学
·
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 90
·87230-87236
·
IF 3.289
Qian Li,Qitong Huang,Jie-Ji Zhu,Wen-Gang Ji,Qing-Xiao Tong
In this paper, a novel quinoline derivative: 8-(pyridin-2-ylmethoxy)quinoline-2-carboxylic acid (Q) has been successfully synthesized, then it was coupled with carbon dots (CDs) to synthesize a CDs–Q nanocomposite by a simple and green method. The CDs–Q nanocomposite can act as a “turn-off” fluorescent chemosensor for detection of Cu2+ ions. It's a good candidate for Cu2+ sensing on account of its excellent properties such as its high sensitivity and selectivity, easy synthesis, excellent fluorescence stability towards temperature and pH, direct detection in aqueous solution and tap water and distinct fluorescence quenching towards Cu2+. We have also discussed the fluorescence quenching mechanism of CDs–Q and the possible coordination mode of CDs–Q with Cu2+. CDs–Q have a wide linear range (0.01–1.2 μM) and high sensitivity towards Cu2+ ions with a detection limit of 0.56 nM. In addition, this fluorescent chemosensor was also applied to determine Cu2+ in tap water with satisfying results.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Honglin Qin,Yuan Tao,Ruiting Niu,Bingyan Han,Lizhen Qiao
In this work, magnetic flower-like and fluorine-doped nickel oxide composites Fe 3 O 4 @SiO 2 @F/NiO were prepared and applied for the magnetic solid-phase extraction (MSPE) of five imidazole fungicides. The obtained materials were characterized by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller analysis to verify the successful synthesis. The effect of some experimental parameters on the extraction efficiency were explored to optimize the MSPE conditions, including the adsorbent dosage, ultrasonic time, salt concentration, sample solution pH, elution solvent type and volume. Then, method validation was performed under the optimal conditions in combination with high-performance liquid chromatography-ultraviolet detection. The determination coefficients ranged from 0.9956 to 0.9991, and the limits of detection and limits of quantification for the imidazole fungicides were 0.1–3 μg·L −1 and 0.3–10 μg·L −1 , respectively. Moreover, the intra-day and inter-day precisions were evaluated in three different concentrations with relative standard deviations in the range of 1.34 %-13.31 % and 4.96 %-13.92 %. At last, the proposed MSPE method was used to enrich and determine imidazole fungicides in tap water, milk and green tea samples, and the spiked recoveries were in the range of 77.93 %-119.38 %, demonstrating the potential of the method in the determination of imidazole fungicides from real samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Wanzhen Xu,Xiaoming Zhang,Weihong Huang,Yu Luan,Yanfei Yang,Maiyong Zhu,Wenming Yang
In this work, the molecular imprinted polymers were synthesized with the low monomer concentrations for dibutyl phthalate (DBP). The polymers were prepared over carboxyl-modified silica nanoparticle, which used methacrylic acid as the functional monomer, ethylene glycol dimethacrylate as the cross-linker agent and azoisobutyronitrile as the initiator in the process of preparation. Various measures were used to characterize the structure and morphology in order to get the optimal polymer. The characterization results show that the optimal polymer has suitable features for further adsorption process. And adsorption capacity experiments were evaluated to analyze its adsorption performance, through adsorption isotherms/kinetics, selectivity adsorption and desorption and regeneration experiments. These results showed that the molecular imprinted polymers had a short equilibrium time about 60 min and high stability with 88% after six cycles. Furthermore, the molecular imprinted polymers were successfully applied to remove dibutyl phthalate. The concentration range was 5.0–30.0 μmol L −1 , and the limit of detection was 0.06 μmol L −1 in tap water samples.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 30
·7133-7144
·
IF 3.431
Zhang Chao,She Yongxin,Li Tengfei,Zhao Fengnian,Jin Maojun,Guo Yirong,Zheng Lufei,Wang Shanshan,Jin Fen,Shao Hua,Liu Haijin,Wang Jing
An electrochemical sensor based on molecularly imprinted polypyrrole (MIPPy) was developed for selective and sensitive detection of the herbicide glyphosate (Gly) in cucumber and tap water samples. The sensor was prepared via synthesis of molecularly imprinted polymers on a gold electrode in the presence of Gly as the template molecule and pyrrole as the functional monomer by cyclic voltammetry (CV). The sensor preparation conditions including the ratio of template to functional monomers, number of CV cycles in the electropolymerization process, the method of template removal, incubation time, and pH were optimized. Under the optimal experimental conditions, the DPV peak currents of hexacyanoferrate/hexacyanoferrite changed linearly with Gly concentration in the range from 5 to 800 ng mL −1 , with a detection limit of 0.27 ng mL −1 ( S/N = 3). The sensor was used to detect the concentration of Gly in cucumber and tap water samples, with recoveries ranging from 72.70 to 98.96%. The proposed sensor showed excellent selectivity, good stability and reversibility, and could detect the Gly in real samples rapidly and sensitively.
Schematic illustration of the experimental procedure to detect Gly using the MIPPy electrode
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）