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
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材料科学
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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
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 5
·1483-1489
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IF 1.637
Xiaogang Liu,Yuwen Cheng,Xiu Wang,Minglei Tian,Xiancai Li,Yifeng Yang
Using 3-chloropropyltriethoxysilane as an anchor, the functional monomer linear polyethylenimine(PEI) was grafted on the surface of mesoporous MCM-41. La 3+ was selected as the template ion and epichlorohydrin was used as the crosslinker. A lanthanum ion MCM-41 imprinted polymer (La(III)-IIP-PEI/MCM-41) was prepared, and a non-ion-imprinted polymer (NIP-PEI/MCM-41) was arranged in the same manner. The La 3+ surface imprinted polymer was characterized by means of infrared spectrometer, thermogravimetric(TG) analyzer, and scanning electron microscope(SEM). The optimal adsorption conditions and selective adsorption properties of La(III)-IIP-PEI/MCM-41 for La 3+ were determined by static adsorption method and adsorption performance. Experiments show that the maximum adsorption capacity of La(III)-IIP-PEI/MCM-41 can reach 212.69 mg g 1 . Adsorption equilibrium can be reached at 30 min. Quasi-second-order kinetic model can be used to describe its adsorption mechanism. La(III)-IIP-PEI/MCM-41 also has a strong selectivity for La 3+ .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Jun Zhang,Meng Wang,Wenli Peng,Zhengcan Chen,Zhenbin Chen
A novel glutathione (GSH) surface molecularly imprinted polymer (SMIP) was prepared using modified macroporous adsorption resin (MAR) CLX1180 as a solid substrate, glutathione as a template, acrylamide (AM) and N-vinyl pyrrolidone (NVP) as functional monomers, and N,N′-methylenebisacrylamide (NMBA) as a cross-linker. The reaction could be initiated by three different ways, using CLX1180, GSH, and both, which was proved by the experimentation. The morphology and structure of this polymer were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and time-of-flight mass spectrometry (TOF-MS). The maximum adsorption capacity of GSH approached 39.03 mg·g–1, and the separation degree related to l-cysteine was as high as 4.18. Pseudo-first-order and Langmuir models were well fitting the adsorption properties. GSH-SMIP could be used for three adsorption/desorption cycles with only a slight decrease of adsorption capacity.
研究领域:
化学
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材料科学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Journal of Zhejiang University-SCIENCE B
·
2016
·
IF 1.303
Sovichea Lay,Hai-ning Yu,Bao-xiang Hu,Sheng-rong Shen
A pre-treatment methodology for clenbuterol hydrochloride (CLEN) isolation and enrichment in a complex matrix environment was developed through exploiting molecularly imprinted polymers (MIPs). CLEN-imprinted polymers were synthesized by the combined use of ally-β-cyclodextrin (ally-β-CD) and methacrylic acid (MAA), allyl-β-CD and acrylonitrile (AN), and allyl-β-CD and methyl methacrylate (MMA) as the binary functional monomers. MAA-linked allyl-β-CD MIPs (M-MAA) were characterized by Fourier transform-infrared (FT-IR) spectroscopy and a scanning electron microscope (SEM). Based upon the results, M-MAA polymers generally proved to be an excellent selective extraction compared to its references: AN-linked allyl-β-CD MIPs (M-AN) and MMA-linked allyl-β-CD MIPs (M-MMA). M-MAA polymers were eventually chosen to run through a molecularly imprinted solid-phase extraction (MISPE) micro-column to enrich CLEN residues spiked in pig livers. A high recovery was achieved, ranging from 91.03% to 96.76% with relative standard deviation (RSD) ≤4.45%.
研究领域:
分析化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 17
·1721-1729
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IF 3.532
Di Deng,Xiaoyu Fang,Ding Duan,Kang Li
There is a critical need for the rapid detection of p-chlorophenol produced by pesticide abuse and industrial wastewater discharge, which has been an urgent problem in the realm of environmental protection. Here, a green and environmentally friendly method was developed to prepare stable and low toxicity quantum dots. First, blue-green fluorescent FeS2 quantum dots (B-FeS2 QDs) were prepared with FeCl3·6H2O (an iron source) and L-cysteine (a capping agent) by the solvothermal method. By combining B-FeS2 QDs with orange carbon dots (O-CDs), a CDs@SiO2/FeS2@MIPs visual fluorescence sensor for the selective detection of p-chlorophenol was constructed. Under optimum conditions, this sensor exhibited a detection limit of 1.265 μM with a linear range of 5.00–50.00 μM and was successfully applied to detect p-chlorophenol in real samples. Moreover, this sensor was successfully applied to visual semi-quantitative detection of p-chlorophenol. This work demonstrated that these sensors, based on FeS2 QDs and CDs, had potentials for in situ and visual detection of environmental contaminants.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 60
·48885-48892
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IF 3.84
Hongkai Xie,Wenhua Ji,Dahui Liu,Wei Liu,Daijie Wang,Ruimin Lv,Xiao Wang
In this work, surface molecularly imprinted polymers with dummy templates were developed as the selective sorbents for preparation of dencichine from the extract of Panax notoginseng for the first time. The polymers were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. The performances of molecularly imprinted and non-imprinted polymers were evaluated, which included selective recognition, adsorption isotherms and adsorption kinetics. Optimization of various parameters affecting molecularly imprinted solid phase extraction, such as sample loading pH and flow rate, the composition and volume of the eluting solvent and the composition and volume of the washing solvent were investigated. Compared with NISPE, MISPE displayed improved specific adsorption performance. Dencichine with a purity of 98.7% was obtained from the aqueous extract of Panax notoginseng with the average recovery of 83.7% (n = 3).
研究领域:
药物化学
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分析化学
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产品关联
DOI
高影响因子
TALANTA
·
2015
·
IF 3.545
Fengling Zhu,Jing Wang,Lijun Zhu,Lanlan Tan,Guanglin Feng,Shaomin Liu,Ya Dai,Hua Wang
In this paper, a novel dummy template molecularly imprinted polymer (DMIP) based on a vinyl-SiO 2 microspheres surface for the simultaneous selective recognition and enrichment of 18 amino acids was prepared via a surface molecular imprinting technique using theanine as a dummy template. Compared to the imprinted polymers prepared using traditional polymerization techniques, the obtained DMIPs exhibited a regular spherical shape and were relatively monodisperse. The maximal sorption capacity ( Q max ) of the resulting DMIPs for the 18 amino acids was up to 1444.3 mg g −1 . A kinetic binding study showed that the sorption capacity reached 85.40% of Q max in 25 min and sorption equilibrium at 30 min. The imprint factors of the sorbents ranged from 2.86 to 6.9 for the 18 amino acids, which indicated that the DMIP sorbents have high selectivity. An HPLC-UV method for the simultaneous determination of 18 amino acids in tobacco and tobacco smoke was developed using the DMIPs as sorbents for solid phase extraction (SPE) in the sample pretreatment procedure. Under the optimum experimental conditions, the materials had enrichment factors of up to 200 for the amino acids, and the recoveries of the 18 amino acids in tobacco smoke were in the range from 79% to 104% with relative standard deviations of less than 7.4%. It indicated that the obtained DMIP sorbents could specifically recognize the amino acids from complicated samples.
研究领域:
分析化学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Zheng-zhong Lin,Hong-yuan Zhang,Ai-hong Peng,Yi-dong Lin,Lu Li,Zhi-yong Huang
Magnetic molecularly imprinted polymers (MMIPs) were synthesized through precipitation polymerization using malachite green (MG) as template, methacrylic acid as monomer, ethylene dimethacrylate as crosslinker, and Fe 3 O 4 magnetite as magnetic component. MMIPs were characterized by scanning electron microscopy, Fourier transform infrared spectrometry, and vibrating sample magnetometry. Under the optimum condition, the MMIPs obtained exhibited quick binding kinetics and high affinity to MG in the solution. Scatchard plot analysis revealed that the MMIPs contained only one type of binding site with dissociation constant of 24.0 μg mL −1 . The selectivity experiment confirmed that the MMIPs exhibited higher selective binding capacity for MG than its structurally related compound (e.g., crystal violet). As a sorbent for the extraction of MG in sample preparation, MMIPs together with the absorbed analytes could easily be separated from the sample matrix with an external magnet. After elution with methanol/acetic acid (9:1, v/v), MG in the eluent was determined by high-performance liquid chromatography coupled with UV detector with recoveries of 94.0–115%. Results indicated that the as-prepared MMIPs are promising materials for MG analysis in aquatic products.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2017
·
IF 4.529
Yiwei Tang,Jingwen Gao,Xiuying Liu,Xue Gao,Tao Ma,Xiaonan Lu,Jianrong Li
As an ideal biomimetic antibody, molecularly imprinted polymer (MIP) has shown great promise in immunoassays. Here, we developed a covalent imprinting method to prepare MIP artificial antibody towards clenbuterol on the well surface of a microtiter plate. Template molecule (clenbuterol) was splited by hydrolysis with functional monomer and removed by methanol/acetic acid solution, and then three-dimensional cavities were fabricated in the MIP, which can rebind template molecule via hydrogen bond interaction. Using this artificial antibody, we developed a novel biomimetic enzyme-linked immunosorbent assay (ELISA) with excellent sensitivity and specificity. The linear range for clenbuterol was 10 −5 to 1000 μg L −1 , with a detection limit of 10 −7 μg L −1 . Cross reactivity of this MIP artificial antibody to other four structural analogs was less than 0.93%. This method was applied to determine clenbuterol in real samples with satisfactory result, suggesting a promising application of the biomimetic ELISA in food and environmental analysis.
研究领域:
分析化学
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食品安全
·
环境科学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2017
·
IF 4.529
Le Wu,Zheng-zhong Lin,Hui-ping Zhong,Ai-hong Peng,Xiao-mei Chen,Zhi-yong Huang
A sensitive fluorescence sensor for the detection of malachite green (MG) was fabricated by grafting molecularly imprinted polymers (MIPs) onto the surface of CdTe quantum dots (QDs). The MIP-coated QDs were synthesized via a reverse microemulsion method using (3-aminopropyl)triethoxysilane (APTES) and tetraethyl orthosilicate (TEOS) as functional monomer and cross-linker, respectively. The optimum molar ratio of MG, functional monomer and cross-linker was 1:3:10. The MIP-coated QDs exhibited uniform spheres with diameter around 49 nm and excellent fluorescence emission at λ ex 370 nm. A linear relationship with two segments between the relative fluorescence intensities and the MG concentrations ranging from 0.08 to 20 μmol·L −1 could be obtained with a detection limit of 12 μg·kg −1 . The fluorescent probe was successfully applied to the determination of MG in fish samples with the spiked recoveries ranging from 94.3% to 109.5% which were in accordance with those of the measurement by HPLC-UV.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yongli Liu,Yue Zhang,Jingwen Niu,Linchun Nie,Shiyu Huang,Huanhuan Liu,Shuai Yuan,Qingxiang Zhou
Bisphenol A (BPA) is an endocrine disrupting chemical and poses a grave threat to the human health. Herein, a fluorescent probe constructed with molecularly imprinted polymers decorated carbon dots (CDs@MIPs) was proposed for determination of BPA with high selectivity . The CDs@MIPs were constructed using BPA, 4-vinylpyridine and ethylene glycol dimethacrylate as template, functional monomer and cross linker, respectively. The obtained fluorescent probe not only owned a highly selective recognition function derived from MIPs but also displayed an excellent sensitivity for sensing BPA stemmed from CDs. The fluorescence intensity of CDs@MIPs was varied before and after the removal of BPA templates. The fluorescent decrease fraction of the fluorescent probe demonstrates a nice linearity in BPA concentration range of 10–2000 nM (r 2 = 0.9998) and the detection limit is as low as 1.5 nM. The fluorescent probe was triumphantly utilized to sense the level of BPA in real aqueous and plastic samples with good results. Moreover, the fluorescent probe offered a wonderful means for fast identification and sensitive detection of BPA from environmental aqueous samples.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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