NANOTECHNOLOGY
·
2021
·Vol. 32
·期 15
·155503
·
IF 3.874
Wangyang Yang,Honglie Shen,Jiawei Ge,Binbin Xu
Various gas sensors have made considerable improvements to the quality of people's lives. However, in most cases, changing of materials is necessary to adapt to the changing of the target gas, which limits the further application of gas sensors. To meet this challenge, in this work, molecular imprinting (MI) technology is introduced. Acrylic acid is used as a functional monomer, while gas molecules, including acetone, are used as templates. The MI process with an acetone template helps improve the acetone selectivity of TiO2 by up to 1.74–2.80 times. Moreover, it proved that other templates can increase the corresponding selectivity by at least 1.5 times by using the same matrix material. These results demonstrate the potential importance of the MI process in constructing a highly compatible gas sensor industry. Beyond this, the MI process has proved to achieve an ultrahigh specific surface area of 384.36 m2 · g−1. The optimal acetone sensor exhibits desirable comprehensive performance compared with other reports. An excellent TiO2 based prototype acetone sensor working at 300 °C with a low detection limit of 18 ppb is obtained.
研究领域:
材料科学
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化学工程
·
传感技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Fang Long,Jing Wang,Zhaohui Zhang,Liang Yan
A novel magnetic molecularly imprinted electrochemical sensor (MMIP-sensor) combined with magnetic molecularly imprinted solid-phase extraction (MMISPE) was constructed for rapid and sensitive detection of tetrabromobisphenol S (TBBPS) in water samples. The magnetic molecularly imprinted polymer based on magnetic graphene/multi-walled carbon nanotubes hybrid composite (MMIP/Gr-MWCNTs) was prepared as MMISPE sorbet to separate and enrich TBBPS from complex system. Adsorption results showed that the MMIP/Gr-MWCNTs possessed excellent selective adsorption toward TBBPS with a maximum adsorption capacity of 17.83 mg g − 1 . The magnetic imprinted sensor based on the magnetic Gr-MWCNTs composite modified electrode was prepared by electropolymerization of dopamine monomer . The high sensitivity of the MMIP-sensor was attributed to the large specific surface area and excellent electrical conductivity of the magnetic Gr-MWCNTs composites. The detection limit of the MIP-sensor toward TBBPS was calculated as 2.1 × 10 − 11 mol L − 1 (S/N = 3). Under the optimum conditions, the MISPE-MMIP-sensor combination system provided 10–12 fold preconcentration than that of MMIP-sensor alone determination. The MISPE-MMIP-sensor was successfully used for detection of TBBPS in drinking water , rain water , lake water and tap water with recoveries of 88.4–98.8%.
研究领域:
分析化学
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环境监测
·
电化学传感
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分子印迹技术
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水处理
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污染物检测
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2014
·
IF 4.258
Wenhua Ji,Lingxiao Chen,Xiuli Ma,Xiao Wang,Qianshan Gao,Yanling Geng,Luqi Huang
Molecular imprinted polymers (MIPs) with high selectivity and affinity to gastrodin in water were designed using allyl 2,3,4,6-tetra- O -acetyl-glucopyranoside (TAGL) and 1,2,3,4,5-pentafluoro-6-vinylbenzene (PFVB) as novel functional monomers. Binding characterization of pre-polymerization complexes was researched by nuclear magnetic resonance (NMR) and the MIPs were characterized by scanning electron microscopy (SEM). The properties involving adsorption isotherm, adsorption kinetics and selective recognition capacity were evaluated. The MIPs/TAGL exhibited good site accessibility in which it only took 30 min to achieve adsorption equilibrium and highly selective recognition for the template. Furthermore, the performance of the MIPs/TAGL as solid phase extraction material was investigated in detail and hot water at 50 °C served as the eluting solvent. Pure gastrodin with the recovery of 76.6% was obtained from the aqueous extract of Gastrodia elata roots.
研究领域:
药学
·
分析化学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Xiaodan Wu,Yawei Zhu,Sansan Bao,Jingsong Cao,Chunjian Zhao,Xiuhua Zhao,Zhiguo Liu,Xiqing Wang,Yujie Fu
In this study, a quercetin molecular imprinted polymer using cellulose as a carrier (CMMs@MPS@MIPs) with high selectivity for quercetin was prepared. Thermogravimetric Analysis (TG), Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM), Transmission electron microscope (TEM) and X-ray diffraction （XRD） were used to analyze the material. The adsorption conditions were optimized, resulting in a CMMs@MPS@MIPs adsorption quantity of 13.19 mg g −1 . The adsorption conditions were optimized and the adsorption amount of CMMs@MPS@MIPs could reach 13.19 mg g −1 . Furthermore, the material could still retain 83.5 % of the adsorption performance after five cycles. CMMs@MPS@MIPs was used as an adsorbent to enrich quercetin in Sophora Japonica extract, and its content was greatly increased from 15.73 % to 68.79 %, which proved that CMMs@MPS@MIPs can efficiently separate and enrich quercetin. This research also provides a scientific basis for the targeted separation of target compounds in the food and pharmaceutical by molecularly imprinted polymers using natural polysaccharides as carriers.
研究领域:
材料科学
·
药学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yiqi Liu,Gang Xue,Yaqian Ma,Lei Ding,Yanli Kong,Yang Gao,Zhonglin Chen
4-Nitrophenol (4-NP) removal using prepared molecular imprinting polymers (MIPs) as a specific adsorbent was investigated. On the basis of single-factor experiment, Box–Behnken statistical experiment design (BBD) and response surface methodology (RSM) were used to investigate the influence of MIPs dosage, initial concentration of 4-NP, pH and temperature of the solution, and their potential interaction effect on 4-NP removal. The quadratic polynomial regression model of response value Y (4-NP removal efficiency) was established based on the BBD experiment al results. The reasonable and reliable of regressive of the model was confirmed by the analysis of variance test and residuals analysis (R 2 = 0.9952). The RSM model indicates that all single-factors had a significant effect on 4-NP removal. The interaction effect between MIPs dosage and temperature, temperature, and pH were not significant but the other four interaction effects were significant. The regression model showed an optimum removal of 79.63%, while 78.39% removal was obtained from batch experiments at the optimum conditions suggested by the regression model, which reconfirmed the validity of the model. The results demonstrated that prepared MIPs possessed a strong adsorption ability for 4-NP removal, allowing a possible practical application in future water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Yanhao Yuan,Yan Liu,Weidi Teng,Jiean Tan,Yong Liang,Youwen Tang
In the current study, a new strategy for the extraction of bisphenol A (BPA) from milk has been employed by using surface-imprinted core-shell magnetic beads, prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization. In order to obtain highly selective recognition cavities, an enhanced imprinting method based on binary functional monomers , e.g. 4-vinylpyridine (4-VP) and β-cyclodextrin (β-CD), was chosen for BPA imprinting. The morphological and magnetic properties of the Fe 3 O 4 -MIP beads were characterized by Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FT-IR) Spectroscopy, Thermogravimetric Analysis (TGA), and Vibrating Sample Magnetometer (VSM). The characterization results suggested that MIP was synthesized evenly on Fe 3 O 4 -SiO 2 surface. The adsorption experiments revealed that Fe 3 O 4 -MIPs showed better extraction capacity and selectivity toward BPA and its analogues than the non-imprinted polymers (NIPs). The saturation capacity of Fe 3 O 4 -MIP was 17.98 mg/g. In milk samples, the present method displayed a lower the detection thresholds, down to 3.7 μg/L. The recoveries of BPA in milk samples for three concentrations were found to be within 99.21%, 98.07% and 97.23%, respectively to three concentrations: 1.0 μmol/L, 10.0 mol/L, 100.0 μmol/L. Thus, the MIPs can be used for remove BPA in milk samples.
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
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-10
·
IF 5.3
Xu Yi,Wang Haiping,Bai Qingyan,Ma Shujuan,Bo Chunmiao,Ou Junjie
A carbon dot (CD) was prepared by o -phenylenediamine and water, which showed bright yellow fluorescence under ultraviolet light irradiation (λ = 580 nm), and verified good fluorescence quenching effect on penicillin G sodium (Png-Na). Using methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a crosslinker, and Png-Na as a template, a kind of composite microsphere combining CD and molecularly imprinted polymer (MIP) was synthesized by surface-initiated atomic transfer radical polymerization (SI-ATRP). For reasons of comparison, we also prepared MIP without CD and non-imprinted polymers (NIPs). Through static and dynamic adsorption experiments, the maximum adsorption capacity was 47.05 mg g −1 and the equilibrium time was 30 min. High-performance liquid chromatography (HPLC) was utilized to determine the content of Png-Na in the spiked milk samples. A sensitive, rapid, and simple method for determination of Png-Na in food samples was developed. The utilized approach enabled the quantification of Png-Na within the concentration range 20–1000 μg L −1 (with a limit of detection of 5 μg L −1 ). The recoveries achieved were in the range 93.3–98.2%, with a relative standard deviation of 1.2–4.2%. The results demonstrated that CD@MIP possessed the capability of specific adsorption and fluorescence detection of Png-Na, enabling simultaneous detection and enrichment of Png-Na in real samples. Graphical abstract
研究领域:
食品科学
·
分析化学
·
材料科学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 2
·349-359
·
IF 3.431
Sun Ya Kun,Jia Man,Yang Jian,Huang Yan-Ping,Liu Zhao-Sheng,Aisa Haji Akber
A method of preparing molecularly imprinted polymers (MIPs) with Zn(II) as a metallic pivot was adopted to solve the problem of imprinting compound with intramolecular hydrogen bonds by forming stronger coordination binding interaction among the template–functional monomer-Zn 2+ complex. A ternary porogenic system including dimethyl sulfoxide, dimethylformamide, and room temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate was employed to fabricate imprinted monolith with high porosity and good flow-through properties, in which chicoric acid (CA), zinc acetate, 4-vinylpyridine (4-VP), and ethylene glycol dimethacrylate (EDMA) was the template, metallic ion, functional monomer, as well as crosslinker, respectively. The influence of polymerization factors including the 4-VP-CA ratio, monomer-crosslinker ratio, template-Zn 2+ ratio on imprinting factors was systematically investigated. When the ratio of 4-VP to CA was 24:1, the greatest IF value (24.81) was achieved on the CA-MIP prepared with zinc acetate. In addition, off-line SPE with the optimal MIPs monolith led to high purity of CA (98.0% ± 0.5%) from extraction of Cichorium intybus L. roots with the recovery of 77.5% ± 2.5% ( n = 6). As a conclusion, the strategy of introducing metal ions as metal pivot to prepare MIPs was a powerful method for the MIPs synthesis to the template molecules with intramolecular hydrogen bonds.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2018
·
IF 2.275
Wei Zheng,Haiyan Wu,Yan Jiang,Jicheng Xu,Xin Li,Wenchi Zhang,Fengxian Qiu
In this work, a novel molecularly imprinted electrochemical sensor (MIECS) based on a glassy carbon electrode (GCE) modified with carbon dots (CDs) and chitosan (CS) for the determination of glucose was proposed for the first time. The use of the environmental-friendly CDs and CS as electrode modifications improved the active area and electron-transport ability substantially, while 3-aminobenzeneboronic acid was used as a functional monomer and glucose as template for the fabrication of molecularly imprinted polymer (MIP) film to detect glucose via differential pulse voltammetry . Transmission electron microscope , Fourier transform infrared spectroscopy , energy dispersive x-ray spectrometry, cyclic voltammetry and electrochemical impedance spectroscopy (EIS) were applied to characterize the fabricated sensor. Experimental conditions such as molar ratio of functional monomer to template, volume ratio of CDs to CS, incubation time and elution time were optimized. By using glucose as a model analyte, the MIECS had two assay ranges of 0.5–40 μM and 50–600 μM, and fairly low limit of detection (LOD) of 0.09 μM (S/N = 3) under the optimized conditions. The MIECS also exhibited excellent selectivity, good reproducibility, and stability. The proposed sensor was successfully applied to a preliminary test for glucose analysis in real human blood serum samples.
研究领域:
分析化学
·
生物医学工程
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DOI
高影响因子
Carbon Letters
·
2023
·Vol. 34
·期 1
·437-444
·
IF 4.5
Sun Bin,Sun Wei,Wang Zhigang,Zhao Bo,Yang Song
In this paper, a simple, cost-effective, and efficient electrochemical sensor for molecular imprinting melatonin was established. The molecular imprinted films were formed by in situ electrochemical polymerization using molecular imprinting technology. The modification method, modification time and other parameters of the electrode were optimized. Under optimized conditions, the sensor responds to melatonin concentration in a linear range of 0–100 μM. The detection limit was 0.171 μM. In addition, the sensor has little response to interfering substances, such as uric acid, vitamin B6, vitamin C, and glucose, and can be tested in real samples. The recoveries were 98.73–101.60%.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2024
·Vol. 18
·期 3
·1-12
·
IF 2.5
Wang Wenshuang,Pan Xingya,Zhang Xinxin,Wang Minglin,Wang Zijia,Feng Lingzhi,Wang Xiaolei,Zhao Kongyin
Combining molecular imprinting technique with titanium dioxide (TiO 2 ) photocatalysis technique can improve the degradation ability and selectivity of TiO 2 nanoparticles towards pollutants. In this work, methyl orange-imprinted polysiloxane particles (MIPs) were synthesized using TiO 2 as matrix and silane as functional monomers. The adsorption capacity ( Q e ) of MIPs was 20.48 mg·g −1 , while the imprinting efficiency (IE) was 3.4. Such MIPs exhibited stable imprinting efficiencies and adsorption efficiencies towards methyl orange (MO) in the multi-cycle stability test. Photocatalytic degradation performances of both MIPs and non-imprinted polysiloxane particles (NIPs) were investigated. Compared with NIPs, MIPs exhibited better photocatalytic degradation performance towards MO, with the degradation efficiency of 98.8% in 12 min and the apparent rate constant ( K obs ) of 0.077 min −1 . The interaction between silane and MO was also studied through molecular dynamics simulation. This work provides new insights into the use of silane for the synthesis of MIPs as well as the molecular imprinting technique for applications in the field of TiO 2 photocatalysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Li Liu,Chenghong Long,Shenghui Wei,Yu Sun
The determination of clenbuterol is crucial for food safety and sport science. In this work, we use tetraethyl orthosilicate and (3-aminopropyl)triethoxysilane as cross-linking agents and functional monomers for the electrodeposition of SiO 2 films with the addition of clenbuterol. After the elution process, the prepared electrode can be used for the sensitive determination of clenbuterol due to the molecular imprinting effect. Under optimum conditions, results show that the current of clenbuterol decreases linearly in the range of 2 μM to 0.1 mM, and the detection limit is 31 nM. The proposed electrochemical sensor also exhibits excellent stability and reproducibility, showing its high potential for use in sensing clenbuterol in food samples.
研究领域:
食品安全
·
分析化学
·
运动科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）