JOURNAL OF SEPARATION SCIENCE
·
2020
·Vol. 43
·期 7
·1356-1364
·
IF 2.878
Liangqun Chen,Hongbing Liang,Jun Xing
In this work, N,N,N -tri(2-carboxyethyl)-3-(2-aminoethylamino)propyl-trimethoxysilane was prepared as a multidentate functional monomer. The 3D model of the monomer coordinating with Cu 2+ indicated that the monomer is able to provide five ligating atoms like ethylenediaminetetraacetic acid-Cu 2+ to complex with Cu 2+ . When Cu 2+ was used as a template ion, the synthesis conditions of Cu 2+ -imprinted polymers were optimized upon orthogonal design. It is interesting to find that Cu 2+ -imprinted polymer offers a selectivity coefficient of 192.2 when the molar ratio of Cu 2+ to monomer was exactly 1:1. That means there is no excess ligating atom in the ion-imprinted polymer and therefore, the nonspecific adsorption could be avoided. Benefiting from the excellent selectivity of Cu 2+ -imprinted polymer, even if the concentration of Zn 2+ was 25 times that of Cu 2+ , Cu 2+ -imprinted polymer still affords a high selectivity coefficient. Finally, the optimal synthesis conditions for Cu 2+ -imprinted polymer, except the pH, were adopted to prepare Ni 2+ -imprinted polymer, and Ni 2+ -imprinted polymer also offered satisfying selectivity to Ni 2+ . That implies this multidentate monomer is adaptable in ion imprinting and, the optimal synthesis conditions of Cu 2+ -imprinted polymer except pH are likely suitable for the imprinting of other ions besides Cu 2+ .
研究领域:
化学
·
材料科学
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DOI
PubMed
高影响因子
SENSORS
·
2020
·Vol. 20
·期 4
·995
·
IF 3.275
Lina Chen,Yue Lu,Minshu Qin,Fa Liu,Liang Huang,Jing Wang,Hui Xu,Na Li,Guobao Huang,Zhihui Luo,Baodong Zheng
In this work, we have fabricated a novel difunctional magnetic fluorescent nanohybrid (DMFN) for the determination of cadmium ions (Cd2+) in water samples, where the “off-on” model and “ion-imprinting” technique were incorporated simultaneously. The DMFN were composed of CdTe/CdS core-shell quantum dots (QD) covalently linked onto the surface of polystyrene magnetic microspheres (PMM) and characterized using ultraviolet-visible spectroscopy (UV-Vis), fluorescence spectroscopy, and transmission electron microscopy (TEM). Based on the favorable magnetic and fluorescent properties of the DMFN, the chemical etching of ethylene diamine tetraacetic acid (EDTA) at the surface produced specific Cd2+recognition sites and quenched the red fluorescence of outer CdTe/CdS QD. Under optimal determination conditions, such as EDTA concentration, pH, and interfering ions, the working curve of determining Cd2+was obtained; the equation was obtained Y = 34,759X + 254,894 (R= 0.9863) with a line range 0.05–8 μM, and the detection limit was 0.01 μM. Results showed that synthesized magnetic fluorescent microspheres had high sensitivity, selectivity, and reusability in detection. Moreover, they have significant potential value in fields such as biomedicine, analytical chemistry, ion detection, and fluorescence labeling.Keywords:bifunctional;magnetic;fluorescent;Cd2+;detection;ion-imprinting
研究领域:
分析化学
·
材料科学
·
环境科学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 18
·10542
·
IF 6.208
Yuheng Qiu,Kaiqi Ding,Liwen Tang,Ziyu Qin,Mengting Li,Xueqiong Yin
The demand for rare earth metal increases rapidly in the modern high-tech industry and therefore the accumulation of rare earth metal ions from an aqueous environment becomes a significant concern worldwide. In this paper, a water-recyclable chitosan-based La3+-imprinted thermoresponsive hydrogel (CLIT) was prepared to accumulate La3+from solution. The CLIT was characterized by DSC, FITR, Raman spectroscopy, XPS, and SEM, which revealed obvious reversible thermosensitivity and imprinted sites of La3+ions. An adsorption capacity of 112.21 mg/g to La3+ions was achieved on CLIT under its optimum adsorption conditions (pH 5, 50 °C, 60 min). The adsorption could be well illustrated by second-order kinetics and Freundlich isotherm models. The La3+-adsorbed CLIT could be recycled only by rinsing with 10 °C cold water, with a desorption rate of 96.72%. After ten cycles of adsorption-desorption, CLIT retained good adsorption capability. In the solution containing six ions, the adsorption coefficients kLa3+/Mn+of CLIT were 2.04–3.51 times that of non-imprinted hydrogel, with kLa3+/Y3+, kLa3+/Gd3+, kLa3+/Al3+, kLa3+/Fe3+and kLa3+/Cu2+being 1.67, 2.04, 3.15, 2.72 and 4.84, respectively.Keywords:thermoresponsive hydrogel;La3+-imprinting;rare earth metal
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Xingsheng Liu,Shengyuan Zhao,Wan Xu,Huijuan Zhang,Siyuan Lu,Zhenbin Chen,Fangfang Niu,Gang Wu
With decreasing global rhenium resources, it has become important to separate and purify rhenium in secondary resources, so a preparation strategy for a chitosan-comodified surface-grafted thermosensitive ion-imprinted composite membrane (CS-Re-TIICM) was developed in this work. The key of this design was that the two ends of a poly(N,N-diethylacrylamide) (PDEA) chain were grafted onto the imprinted polymer separating the layer matrix and the surface of the membrane, respectively, which aimed to improve the selectivity and desorption ratio of this material simultaneously. The structure and morphology of this material were characterized by FTIR and SEM, respectively. In addition, CS-Re-TIICM was applied to the secondary leaching solution of the high-temperature alloy to test the actual separation effect, and results showed that CS-Re-TIICM, possessing thermoresponsive recognition sites, and the structure of the imprinting cavity could be adjusted by temperature, which helped this material achieve good selective separation and purification performance for ReO4–. The maximum adsorption capacity was 0.1071 mmol/g at 35 °C. CS-Re-TIICM not only showed an excellent selectivity (separation ReO4–/MnO4– of 3.90 in the presence of interfering ion MnO4–) but also presented an excellent desorption performance (desorption ratio of 68.94%) and good reusability (adsorption capacity of 0.0425 mmol/g, desorption ratio of 59.13%, and separation degree of 1.24). When CS-Re-TIICM was applied to the secondary leaching solution of high-temperature alloys, the purity of Re was increased from 35.41% to 65.10% after one adsorption/desorption cycle, which depicted a prospective application in the industrialized separation of ReO4– from a complex environment.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dongxue Fu,Guifang Wang,Li Zhao,Yuwen Hong,Baoming Yang,Huiling Cheng
Green ion-imprinting technique was applied to construct a Cr(III) ion-imprinted absorbent material from an amino functionalized chitosan derivative. First, nitrogenous organic compounds (GACS) as functional monomer is synthesized by a Schiff base reaction followed by a grafting reaction. In the end, imprinting was completed by cross-linking with epichlorohydrin (ECH) in aqueous media and eluting the coordinated ions with hydrochloric acid to obtain chromium-imprinted polymers (Cr(III)-IIP) with pores. The relevant parameters of the imprinting system were explored, and the superior polymer (Cr(III)-IIP 9 ) has an excellent adsorption capacity 385.89 mg/g, wide pH range adsorption, good adsorption rates and equilibrium times (≤120 min) for Cr(III) ion. Additionally, the kinetic study is best defined in terms of pseudo-second order, while the Freundlich isotherm model fits the data well. Competitive adsorption of the quaternary system of Cr(III)/ Cd(II)/ Ni(II)/ Cu(II) were also investigated, it demonstrated a greater affinity for the Cr(III) ion than other ions. Hence, the imprinting materials prepared by amino functionalized chitosan enhances the adsorption of Cr(III) ions in the simulation of actual water sample. The adsorption mechanism accords with the hard and soft acid and base theory (HSAB), which is expected to be is utilized for the separation of Cr(III) ions in the environment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ANALYST
·
2016
·Vol. 141
·期 20
·5886-5892
·
IF 4.033
Jing Wang,Chenxing Jiang,Xiaoqi Wang,Ligeng Wang,Aimin Chen,Jun Hu,Zhihui Luo
In this work, we have fabricated a new dual-emission quantum dot (QD) nanohybrid for fluorescence ratiometric determination of cadmium ions (Cd2+) in water samples, where the “turn-on” model and “ion-imprinting” technique were incorporated simultaneously. The nanohybrid probe was composed of green-emitting CdSe QDs covalently linked onto the surface of silica nanoparticles embedded with red-emitting CdTe QDs. The chemical etching of ethylene diamine tetraacetic acid (EDTA) at the surface produced specific Cd2+ recognition sites and quenched the green fluorescence of outer CdSe QDs. Upon exposure to different amounts of Cd2+, the green fluorescence was gradually restored, whereas the inner red fluorescence remained constant. As a consequence, an obviously distinguishable fluorescence color variation (from red to green) of the probe solution was observed. Under the optimized conditions, the developed ratiometric sensor displayed a linear response range from 0.1 to 9 μM with a detection limit of 25 nM (S/N = 3) for Cd2+, which could offer an alternative sensing approach for the highly sensitive and selective detection of heavy metal ions.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Rong He,Zhihong Wang,Lei Tan,Yi Zhong,Weiming Li,Da Xing,Chaohai Wei,Youwen Tang
We developed two types of novel highly ordered Ni 2+ imprinted mesoporous organosilica materials (SBA-15 (NiIMS1) and MCM-41 (NiIMS2)) through co-condensation for selective adsorption of Ni 2+ from electroplating Ni 2+ effluents. FTIR and solid-state 13 C NMR spectra demonstrated the successful embedment of functionalized iminodiacetic acid and ethanediamine chelating groups in NiIMS1 and NiIMS2, respectively. X-ray photoelectron spectroscopy analysis confirmed that Ni 2+ was coordinated by N atom and carboxyl O atom of the functional groups. Furthermore, NiIMS1 and NiIMS2 displayed highly ordered periodic hexagonal P6mm meso-structure, large surface area, and highly specific recognition ability toward Ni 2+ . The adsorption experimental results proved that NiIMS1 was suitable for acidic wastewater treatment , whereas NiIMS2 was fit for alkaline wastewater. The saturated adsorption capacity of NiIMS2 was 20.8 mg/g at pH 6.0, and that of NiIMS1 reached up to 22.9 mg/g at pH 3.0. The values of selectivity coefficients of NiIMS1 and NiIMS2 for five competing metal ions ranged from 46.4 to 12.4 and 36.9 to 18.8, respectively. The adsorption efficiency of NiIMS1 was above 92.5% even after seven extraction-stripping cycles, while that for NiIMS2 was 90.9%. The real sample adsorption experiments demonstrated that these mesoporous organosilica materials have high potential for water treatment applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
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
·
环境科学
·
材料科学
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产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Yadong Hu,Juan Liu,Bin Liu,Donghu Liu,Yingying Hu,Qiang Wu,Xingdao He
In this work, a novel micro/nanofiber sensor array with high sensitivity and good selectivity was demonstrated to simultaneously detect Cr
3+
and Ni
2+
. The high sensitivity was caused by the evanescent field around a microfiber taper waist region. The specific recognition was achieved using an ion-imprinted polymer coating. The experimental results demonstrated a high sensitivity of 0.01086 nm/nM for Cr
3+
, with a linear response in the range of 10-100 nM and a limit of detection (LOD) as low as 0.67174 nM. The sensor array was highly selective and able to distinguish Cr
3+
and Ni
2+
, even at a high concentration of interfering ions (1 μM). Additionally, the practicability of our proposed sensor array for the simultaneous detection of Cr
3+
and Ni
2+
in industrial wastewater samples was evaluated, and it achieved simultaneous ppb level detection for Cr
3+
and Ni
2+
in wastewater. This investigation will facilitate heavy metal ion (HMI) trace detection in the field of drinking water.
研究领域:
环境科学
·
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 9
·1376
·
IF 4.329
Zhiming Wang,Cuo Zhou,Shunwei Wu,Chunyan Sun
Fluorescence analysis technology and ion imprinting technology are combined to prepare a copper ion fluorescence sensor. Carbon quantum dots (CQDs), with a quantum yield of 79%, were synthesized by a hydrothermal process using citric acid as the carbon source. The prepared CQDs, acting as the fluorophore, were grafted onto the surface of an SBA-15 mesoporous molecular sieve by an amidation reaction. Then, the fluorescent sensor CQDs@Cu-IIP was prepared using a surface imprinting technique with the modified SBA-15 as the substrate, copper ions as a template, tetraethoxysilane as the crosslinker, and 3-aminopropyl-3-ethoxysilane as the functional monomers. The sensor showed strong fluorescence from CQDs and high selectivity due to the presence of Cu(II)-IIP. After the detection conditions were optimized, the fluorescence intensity of the sensor had good linearity with Cu(II) concentration in a linear range of 0.25–2 mg/L and 3–10 mg/L. This CQDs@Cu-IIP was applied to the determination of traces Cu(II) in real water samples and good recoveries of 99.29–105.42% were obtained. The present study provides a general strategy for fabricating materials based on CQDs for selective fluorescence detection of heavy metals.Keywords:carbon quantum dots;fluorescence quenching;ion-imprinted polymer;copper(II) ion
研究领域:
分析化学
·
材料科学
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DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2020
·
IF 1.467
Yingmei Liu,Deqiong Hu,Xianzhi Hu,Shuliang Chen,Li Zhao,Yunlong Chen,Peng Yang,Xuecong Qin,Huiling Cheng,Futing Zi
Cr(VI) anion-imprinted composite membranes (Cr(VI)-IICM1∼23) based on a designed functional monomer N,N'-(ethane-1,2-diyl)bis(2-methylacrylamide) (EBMA) were synthesized via surface-grafting. Using nylon-6 membrane for support, the main imprinting parameters, i.e., the functional monomer and crosslinker dosages, membrane soaking times, and porogen solvent ratios were optimized. The morphology and surface area of the optimum imprinted composite membrane (Cr(VI)-IICM11) were characterized by scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analysis. The effects of the Cr(VI) anion concentration, adsorption time, temperature, and pH on adsorption were investigated. Additionally, the permeation, mass transfer, and adsorption of the Cr(VI)-IICM11 were characterized for aqueous Cr(VI) anions. The adsorption capacity and imprinting factor of the Cr(VI)-IICM11 in the imprinting solution were high, and the membrane had good permeation selectivity for Cr(VI) anions. Additionally, Cr(VI)-IICM11 efficiently adsorbed aqueous Cr(VI) anions. These results suggest that EBMA was a suitable functional monomer for Cr(VI) anions serving as the template. Therefore, Cr(VI)-IICM is a suitable material for adsorbing and separating Cr(VI) anions in complex, aqueous solutions.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 71
·43425-43431
·
IF 3.119
Junwen Li,Haiming Cheng
Molecular sieve 5A was modified with (3-aminopropyl) triethoxysilane (APTES) as the support matrix, on which 4-VP was used as the ionic imprinting group. The as-prepared IIZMS-APTES was applied as the adsorbent for the recovery of chromium(VI) from aqueous solutions. The adsorbent was characterized via Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy (SEM), and X-ray diffraction (XRD). The influences of adsorption time, concentration of the ions, initial pH, and temperature on the adsorption performance to Cr(VI) were investigated. The selectivity and reusability of IIZMS-APTES are also evaluated. The results showed that the maximum adsorption capacity reached 56.46 mg g−1 when the initial concentration of metal ions was at 100 mg L−1 at pH 2 and 30 °C. The adsorption process followed the pseudo-second-order kinetic model and Langmuir adsorption isotherm model. The IIZMS-APTES exhibits an efficient selective adsorption of Cr(VI) from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 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）