PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2018
·Vol. 20
·期 18
·12870-12878
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IF 3.906
Delong Kong,Ning Qiao,Nian Wang,Zhuo Wang,Qi Wang,Zhiyong Zhou,Zhongqi Ren
A novel nanostructured magnetic ion-imprinted polymer (IIP) was synthesized for the selective adsorption of Pb(II) from aqueous solution. The IIP was prepared on functional Fe3O4@SiO2 core/shell nanoparticles as a support. Monomer units in the polymer featured the typical bidentate ligand itaconic acid. We used ethylene glycol dimethacrylate and 2,2-azoisobisbutyronitrile as a cross-linker and an initiator, respectively. Monomers with different acid–base properties and different proportions of cross-linker were investigated to obtain high-performance adsorbents. Our results showed that the IIP prepared from itaconic acid had a high adsorption capacity owing to the strong binding between the monomer and Pb(II) template ion. The IIPs were characterized using Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface area analysis, thermogravimetric analysis, and transmission electron microscopy. We confirmed the formation of a nano-imprinted shell layer on the surface of Fe3O4@SiO2. The adsorption rate was fast, conforming to a pseudo-second-order kinetic and Langmuir adsorption model; the adsorption mechanism was deemed to be chemisorption as a single molecular layer. The maximum adsorption capacity of the IIP (51.2 mg g−1) was approximately three times as large as that of the non-imprinted polymer (17.9 mg g−1). The selectivity factors for Pb(II) in mixed solutions of Pb(II)/Co(II), Pb(II)/Cu(II), and Pb(II)/Zn(II) were 45.6, 6.45, and 8.3, respectively. Pb-IIP exhibited a high selectivity towards Pb(II), which enabled the enrichment of Pb(II) in aqueous solution.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Polymers
·
2017
·Vol. 9
·期 8
·360
·
IF 3.364
Xiaoyan Xu,Mei Wang,Qing Wu,Zhenlin Xu,Xingguo Tian
Ion-imprinted polymers (IIPs) have received much attention in the fields of separation and purification. Nevertheless, selectivity of IIPs for trace target ions in complicated matrix remains a challenge. In this work, a cadmium magnetic ion-imprinted polymer (MIIP) was synthesized via surface imprinting, using methacrylic acid and acrylamide as dual functional monomers, vinyltrimethoxysilane as ligand, Fe3O4@SiO2as support, azodiisobutyronitrile as initiator, and ethylene glycol dimethacrylate as crosslinker. The MIIP was characterized by transmission electron microscopy, infrared spectroscopy, thermal gravimetric analysis, and a vibrating sample magnetometer. The maximum adsorption capacities of the MIIP and magnetic non-imprinted polymer for Cd(II) were 46.8 and 14.7 mg·g−1, respectively. The selectivity factors of Pb(II), Cu(II), and Ni(II) were 3.17, 2.97, and 2.57, respectively, which were greater than 1. The adsorption behavior of Cd(II) followed the Freundlich isotherm and a pseudo second order model. The MIIP was successfully used for the selective extraction and determination of trace Cd(II) in representative rice samples. The limit of detection and recovery of the method was 0.05 µg·L−1and 80–103%, respectively, with a relative standard deviation less than 4.8%. This study shows that MIIP provides an attractive strategy for heavy metal detection.Keywords:magnetic ion-imprinted polymers;cadmium ion;dual functional monomers;solid-phase extraction
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
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 56
·29715-29723
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IF 3.708
Shoulian Wei,Yong Liu,Mingdong Shao,Ling Liu,Hongwu Wang,Yanqing Liu
A novel magnetic ion-imprinted polymer (MIIP) was prepared by inverse microemulsion polymerization using ethylene glycol dimethacrylate (EGDMA) as the cross-linker, and 2,2-azo-bis-isobutyronitrile (AIBN) as the initiator. Fe3O4 particles were incorporated into the imprinted polymer matrix containing 4-vinyl pyridine and acrylate-modified Spirulina platensis as the functional monomers, Pb(II) and Cd(II) as double-templates. The MIIP product was characterized by Fourier-transform infrared spectroscopy, thermal gravimetric analysis and scanning electron microscopy and then evaluated for the magnetic solid-phase extraction of Pb(II) and Cd(II) from environmental and food samples. Inductively coupled plasma-optical emission spectrometry detection was also performed. The obtained MIIP showed the magnetic property, agglomerates of globular particles and rough surface morphologies. The maximum static adsorption capacities of MIIP for Pb(II) and Cd(II) were 108 and 56 mg g−1, respectively. The factors affecting the adsorption and separation of Pb(II) and Cd(II), namely, solution pH, adsorbent dosage, eluting solvent, and elution time, were investigated. Under the optimized conditions, the detection limits (S/N = 3) of the method were 0.1 and 0.08 μg kg−1 for Pb(II) and Cd(II), respectively. The relative standard deviations (RSDs) for 10-replicate detections of a soil sample were 3.3% and 3.7% for Pb(II) and Cd(II), respectively. Standard solutions containing Pb(II) and Cd(II) in the concentration range of 0.8 to 5000 μg kg−1 were analyzed by the proposed procedure and it was found that the calibration curve was linear in this range (R2 ≥ 0.999). The proposed method was successfully used to determine the Pb(II) and Cd(II) contents of cinnamon, lotus root and sweet potato with recovery rates ranging from 87.5% to 106%.
研究领域:
材料科学
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分析化学
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环境科学
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 3
·e4778
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IF 3.259
Jicheng Xu,Zhilong Pu,Xuechao Xu,Yuanyuan Wang,Dongya Yang,Tao Zhang,Fengxian Qiu
With the gradual exhaustion of land mineral resources, oceans and lakes have attracted world attention because they are abundant in inorganic mineral resources including lithium, potassium, rubidium and cesium. Lithium is becoming the key material in manufacturing of primary and secondary batteries used in various portable devices and hybrid/electric vehicles. Rubidium has been widely applied inglobal positioning satellites, magneto-optic modulators, solid-state lasers, phosphors, and glass manufacturing. In this work, a novel dual-functional magnetic ion imprinting polymer (Fe 3 O 4 @SiO 2 @IIPs) powder was prepared using 12-crown-4 (12C4) and 18-crown-6 (18C6) as functional monomer, and characterized by FT-IR, elemental analysis, XRD, TGA, SEM and TEM. The adsorption performance of Fe 3 O 4 @SiO 2 @IIPs for simultaneous adsorption of lithium and rubidium from simulative salt lakes was evaluated by batches of experiments at various pH values, contact time, and initial concentrations. Kinetic experiments show that the adsorption process followed the pseudo second order kinetic model. Langmuir adsorption isotherm model and Freundlich adsorption equilibrium data were fitted; the results show that Langmuir isotherm model is more suitable for the adsorption process. Additionally, Fe 3 O 4 @SiO 2 @IIPs exhibit specificity towards Li(I) and Rb(I) and low competitive behavior with Na(I), K(I) and Mg (II). Additionally, the selectivity properties, reusability and adsorption thermodynamic were also investigated. The obtained results show that the prepared Fe 3 O 4 @SiO 2 @IIPs material remains high adsorption capacities after five cycles, exhibits excellent abilities to simultaneously and selectively recover Li + and Rb + and have a promising application in the simultaneous adsorption of lithium and rubidium ions.
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
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2017
·
IF 1.591
Lin Yang,Shengfang Li,Chunyan Sun
A new Cs(I) magnetic ion-imprinted polymer (Cs(I)-MIIP) aimed at the selective adsorption and separation of Cs(I) from salt lake brine was prepared. The Fe3O4@SiO2 was used as supporter, Cs(I) as template ion, and carboxymethyl chitosan as functional monomer. The product was characterized by Fourier transform infrared spectra, XRD, energy-dispersive spectrometry, scanning electron microcopy, thermogravimetric analysis, and vibrating sample magnetometer. The adsorption of the Cs(I)-MIIP in solution was investigated, which indicated the maximum adsorption capacity was 36.15 mg·g−1 under the optimum conditions. The pseudo-first-order kinetic model and the Freundlich isotherm model were applied to predict the adsorption process of Cs(I) onto Cs(I)-MIIP. Selectivity experiments showed that the relative selectivity coefficient (k′) were 24.995, 1.73, 1.43, 4.83, and 1.63 to Cs(I)/Li(I), Cs(I)/Na(I), Cs(I)/K(I), Cs(I)/Rb(I), and Cs(I)/Sr(II) binary solutions, higher than those of NIP, respectively. Furthermore, the Cs(I)-MIIP was successfully applied to the enrichment and separation of Cs(I) from the salt lake brine of Qinghai, with satisfactory Cs(I) recovery rates.
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
Journal of Cleaner Production
·
2020
·
IF 7.246
Chunsheng Xie,Xiangjin Huang,Shoulian Wei,Chun Xiao,Jiangfei Cao,Zhenxing Wang
An environmentally friendly dual-template magnetic ion imprinted polymer (DMIIP) of Cd 2+ and Pb 2+ were prepared by surface imprinting technique combined with a sol-gel process using Cd 2+ and Pb 2+ as dual-templates, papain as a functional monomer and magnetic mesoporous Fe 3 O 4 @mSiO 2 as substrate. The Polymer was characterized using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and adsorption experiments. Maximum adsorption capacities of DMIIP were 41.69 for Cd 2+ and 76.39 mg/g for Pb 2+ in a mixed solution. We also studied factors affecting adsorption and desorption of Cd 2+ and Pb 2+ . DMIIP clearly demonstrates a stronger ability than dual-template magnetic none-ion imprinted polymer (DMNIP) to selectively adsorb Cd 2+ and Pb 2+ from solutions containing other metal ions . Absorption by DMIIP was well fitted with a pseudo-second-order kinetic model . After eight adsorption-desorption cycles, adsorption capacity of DMIIP relative to Cd 2+ and Pb 2+ decreased 6.1% and 6.3%, respectively. The developed MISPE-GFAA method using DMIIP as adsorbent was satisfied to Cd 2+ and Pb 2+ determination in soil and food samples. The polymer could be a green and promising adsorbent to remove Cd 2+ and Pb 2+ from soil and food samples.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 41
·23474-23483
·
IF 3.049
Chunsheng Xie,Shoulian Wei,Dan Chen,Wenying Lan,Zijun Yan,Zhenxing Wang
In this work, a magnetic ion imprinted polymer (MIIP) with specific recognition capability toward cadmium was prepared by a sol–gel method using waste beer yeast, which is a macromolecule biomass, as a functional monomer. The obtained Cd(II)-MIIP was characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and adsorption experiments. Then, a MIIP adsorbent based magnetic solid phase extraction (MSPE)-graphite furnace atomic absorption (GFAA) method was established to analyze the cadmium content in food and environmental samples. The maximum cadmium adsorption capacities by the MIIP and magnetic non-imprinted polymer (MNIP) were 62.74 and 32.38 mg g−1, respectively. The absorption by the MIIP was fitted using a pseudo-second-order kinetic model. The Cd(II)-MIIP demonstrated superior absorption capability for selective removal cadmium. The recovery rate of the MIIP was 90.7% after four adsorption–desorption cycles. The calculated Cd(II) detection limit (S/N = 3) was 0.18 μg L−1 with the relative standard deviation (RSD) equal to ∼3.5% for 10 μg L−1 of Cd(II) standard solution. Our proposed method was successfully used in detecting Cd(II) in aqueous samples. The results obtained in this work suggest that the Cd(II)-MIIPs might be promising adsorbents to remove harmful cadmium ions from aqueous samples.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·54679-54692
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IF 3.289
Yan Liu,Fangfang Liu,Liang Ni,Minjia Meng,Xiangguo Meng,Guoxing Zhong,Jian Qiu
In this paper, response surface methodology (RSM) was successfully applied for the first time to optimize the dynamic adsorption conditions for the maximum removal of Sr(II) ion from aqueous solutions using Sr(II) ion imprinted polymers (Sr(II)-IIPs) as adsorbents. Sr(II)-IIPs based on the support matrix of magnetic SBA-15 (Fe3O4@SBA-15) were prepared by a surface imprinted technique and RAFT polymerization. The adsorbents can be separated from the fixed-bed column after adsorption by an external magnetic field. The effects of the operational parameters for maximizing Sr(II) removal were studied using Box–Behnken design (BBD) combined with RSM. A second-order quadratic model was built to predict the responses. The significance of the independent variables and their interactions was studied and tested by analysis of variance (ANOVA). The adequacy of the model was tested by the correlation between the experimental and predicted values of the responses. At optimum adsorption conditions, the Sr(II) adsorption capacity of Sr(II)-IIPs was found to be 22.12 mg g−1. Moreover, Sr(II)-IIPs exhibited an excellent dynamic selectivity of Sr(II) and could be easily regenerated by a dynamic desorption process with a desorption ratio of 99.2%.
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
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Bin Guo,Fang Deng,Yu Zhao,Xubiao Luo,Shenglian Luo,Chaktong Au
A magnetic ion-imprinted polymer (Fe 3 O 4 @SiO 2 -IIP) functionalized with –SH groups for the selective removal of Pb(II) ions from aqueous samples was synthesized by surface imprinting technique combined with a sol–gel process using 3-mercaptopropyl trimethoxysilane as monomer, tetraethyl orthosilicate as cross-linking agent, and Pb(II) ion as template. The Fe 3 O 4 @SiO 2 -IIP was characterized by infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometry. Fe 3 O 4 @SiO 2 -IIP showed higher capacity and selectivity than that of Fe 3 O 4 @SiO 2 -NIP. The effects of initial concentration of Pb(II) and pH of medium on adsorption capacity of Fe 3 O 4 @SiO 2 -IIP were studied. The experimental data fits well with the Langmuir adsorption isotherm. The maximum Pb(II)-sorption capacity calculated from Langmuir isotherm is 32.58 mg/g and 16.50 mg/g for Fe 3 O 4 @SiO 2 -IIP and Fe 3 O 4 @SiO 2 -NIP, respectively. Kinetics studies show that the adsorption process obeys a pseudo-second-order kinetic model with high correlation coefficient ( R 2 = 0.9982). The separation factor of Fe 3 O 4 @SiO 2 -IIP for Pb(II)/Cu(II), Pb(II)/Zn(II), and Pb(II)/Co(II) are 50.54, 52.14, and 37.39, respectively. The adsorption thermodynamic parameters Δ G , Δ H and Δ S were −4.98 kJ/mol, 3.27 kJ/mol and 28.84 J/mol/K, respectively. In addition, the spent Fe 3 O 4 @SiO 2 -IIP can be refreshed by simple washing with aqueous HCl solution, and there is no significant decrease in adsorption capacity after a test of up to five cycles, demonstrating that the Fe 3 O 4 @SiO 2 -IIP is stable and reusable.
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
RSC Advances
·
2015
·Vol. 5
·期 65
·52369-52381
·
IF 3.84
Zhanchao Liu,Zhaoyong Hu,Yan Liu,Minjia Meng,Liang Ni,Xiangguo Meng,Guoxing Zhong,Fangfang Liu,Yanmin Gao
Utilising a general protocol for making surface-imprinted core–shell microparticles via a RAFT-mediated approach, we developed a Cu(II) imprinted polymer with a novel magnetic nanosphere, γ-Fe2O3@meso-SiO2, as support. Attributed to the controlled/living polymerization mechanism of the RAFT polymerization process, the Cu(II) imprinted polymer prepared by RAFT polymerization (IIP-RAFT) presented a more well-defined morphology, more mono-dispersed properties, and much higher magnetic responsiveness, compared to the Cu(II) imprinted polymer prepared by traditional free-radical polymerization (IIP-TP). Moreover, in the static saturation binding experiments, a higher binding capacity of IIP-RAFT (210 mg g−1) than IIP-TP (145 mg g−1) was also found. Afterwards, a series of adsorption experiments were carried out to systematically evaluate the adsorption performance of the as-prepared IIP-RAFT. And the results showed that IIP-RAFT exhibited excellent selectivity, good reusability and desirable dynamic adsorption behavior, and could be an ideal candidate for SPE sorbents for the removal of Cu(II) in real wastewater.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Long Wang,Zhiming Wang,Cuo Zhou,Weijun Song,Chunyan Sun
A cesium potentiometric microsensor based on magnetic ion-imprinted polymer (MIIP) has been developed for Cs(I) sensing. The core-shell structure Cs(I)-MIIP was synthesized by surface-imprinting technique, using functionalized magnetic Fe3O4@SiO2 microspheres, Cs(I) ion and carboxymethyl chitosan as supporter, template and functional monomers respectively. The resultant Cs(I)-MIIP was used as ionophore in the construction of the PVC membrane electrode to obtain a selective potentiometric microsensor toward Cs(I) ions. The fabricated sensor exhibited a highly sensitive Nernstian response (60.2 mV/decade) over the concentration range of 1 × 10−6 to 1 × 10−1 M of Cs(I). The response time of the microsensor was considerably short (less than 3 s) and its detection limit was determined as 3.0 × 10−7 M. The microsensor was effectively performed in the pH range of 4–6, and revealed desirable selectivity over a wide variety of other cations including alkali, alkaline earth and heavy metals. The proposed microsensor was also used for the determination of Cs(I) contents in the environmental water samples. The potentiometric results were in good harmony with the results obtained by the ICP-MS method.
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 RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2012
·Vol. 295
·期 1
·167-177
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IF 1.52
He F. F.,Wang H. Q.,Wang Y. Y.,F Wang X.,Zhang H. S.,Li H. L.,Tang J. H.
A new complex of N , N ′-bis(3-allyl salicylidene) o -phenylenediamine and thorium(IV) (Th(IV)) was synthesized and used as the functional monomer for a novel Th(IV) magnetic ion-imprinted polymer; this polymer was synthesized using a surface imprinting technique that included the modified magnetic Fe 3 O 4 particle and used tetraethyl orthosilicate, 3-Aminopropyltriethoxysilane and maleic anhydride in the process. The magnetic polymer was characterized using FT-IR, and powder- and single crystal-XRD. The behavior of Th(IV) was investigated using batch experiments. At pH 4.5, the uptake capacity of this adsorbent and that of the non-imprinted polymer was 42.54 and 14.10 mg g −1 , respectively, and the relative selectivity coefficient values of the synthesized adsorbent for Th(IV)/La(III), Th(IV)/Ce(III), Th(IV)/Nd(III), and Th(IV)/U(VI) were 82.2, 93.1, 21.0 and 62.4 times greater than that of the non-imprinted matrix, respectively. In addition, the Th(IV) adsorption process using Fe 3 O 4 @SiO 2 -IIP follows pseudo-second-order reaction kinetics and the Langmuir adsorption isotherm. The thermodynamic parameters also suggest that the adsorption of Th(IV) onto Fe 3 O 4 @SiO 2 -IIPs was a spontaneous and endothermic process.
研究领域:
材料科学
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环境化学
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分析化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）