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Journal ArticleDOI: 10.1080/01496395.2019.1575418

Ion-imprinted polymer for selective separation of cobalt, cadmium and lead ions from aqueous media

04 Mar 2021-Separation Science and Technology (Taylor & Francis)-Vol. 56, Iss: 4, pp 671-680
Abstract: Ion-imprinting polymers (IIPs) materials draw the great awareness because of the powerful selectivity to the desired metal ions. Thus, the IIPs were prepared by using metals such as Co, Cd and Pb i...

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8 results found


Open accessJournal ArticleDOI: 10.3390/POLYM11111876
13 Nov 2019-Polymers
Abstract: Nowadays, water quality monitoring is an essential task since environmental contamination and human exposure to heavy metals increased. Sensors that are able to detect ever lower concentrations of heavy metal ions with greater accuracy and speed are needed to effectively monitor water quality and prevent poisoning. This article shows studies of the modification of flexible track-etched membranes as the basis for the sensor with various polymers and their influence on the accuracy of detection of copper, cadmium, and lead ions in water. We report the UV-induced graft (co)polymerization of acrylic acid (AA) and 4-vinylpyridine (4-VPy) on poly(ethylene terephthalate) track-etched membrane (PET TeMs) and use them after platinum layer sputtering in square wave anodic stripping voltammetry (SW-ASV) for detection of Cu2+, Cd2+, and Pb2+. Optimal conditions leading to functionalization of the surface and retention of the pore structure were found. Modified membranes were characterized by SEM, FTIR, X-ray photoelectron spectroscopy (XPS) and colorimetric analysis. The dependence of the modification method on the sensitivity of the sensor was shown. Membrane modified with polyacrylic acid (PET TeMs-g-PAA), poly(4-vinylpyridine) (PET TeMs-g-P4VPy), and their copolymer (PET TeMs-g-P4VPy/PAA) with average grafting yield of 3% have been found to be sensitive to µg/L concentration of copper, lead, and cadmium ions. Limits of detection (LOD) for sensors based on PET TeMs-g-PAA are 2.22, 1.05, and 2.53 µg/L for Cu2+, Pb2+, and Cd2+, respectively. LODs for sensors based on PET TeMs-g-P4VPy are 5.23 µg/L (Cu2+), 1.78 µg/L (Pb2+), and 3.64 µg/L (Cd2+) µg/L. PET TeMs-g-P4VPy/PAA electrodes are found to be sensitive with LODs of 0.74 µg/L(Cu2+), 1.13 µg/L (Pb2+), and 2.07 µg/L(Cd2+). Thus, it was shown that the modification of membranes by copolymers with carboxylic and amino groups leads to more accurate detection of heavy metal ions, associated with the formation of more stable complexes.

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10 Citations


Journal ArticleDOI: 10.1016/J.IJBIOMAC.2020.08.009
Abstract: Combining ion-imprinting technology with pH-dependent adsorptive features of acid- or salt-activated zeolites brings up the opportunity to develop composite polymer materials with ‘desired’ sorption properties and performances. In this respect, we present here Co2+-imprinted composite cryo-beads with switching on/off selectivity towards the template ions, engineered by selecting the appropriate zeolite-treatment conditions and/or controlling the initial sorption pH values. Co2+ chelating efficiency of all cryo-beads was investigated either at pH 4 or 6 depending on zeolite conditioning strategy. The maximum sorption capacity values of ion-imprinted cryo-beads were from about 5 up to 7 times higher compared with those of non-imprinted ones. Under competitive conditions (Cu2+, Ni2+, Fe2+ and Cd2+ ions), the change of pH value from 4 to 6 resulted in a remarkable quenching of Co2+ selectivity generated by the zeolite shift from the H+-form to the Na+-form. The presence of zeolites within cryogel matrix generated composites with outstanding elasticity that allows the instant recovery of gels after full compression. These results indicate that the cryogel-type composites can be successfully re-used in separation processes for several times without losing their features.

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9 Citations


Journal ArticleDOI: 10.1080/01496395.2019.1659366
Abstract: A porous and high surface area-activated carbon based on Pongamia pinnata pods (PPP) was synthesized using a chemical method. The synthesized material was characterized using FTIR, XRD, BET, SEM, E...

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Topics: Pongamia (60%), Activated carbon (55%), Adsorption (54%) ... read more

4 Citations


Open accessJournal ArticleDOI: 10.3390/MA14051083
26 Feb 2021-Materials
Abstract: Growing concern over the hazardous effect of radionuclides on the environment is driving research on mitigation and deposition strategies for radioactive waste management. Currently, there are many techniques used for radionuclides separation from the environment such as ion exchange, solvent extraction, chemical precipitation and adsorption. Adsorbents are the leading area of research and many useful materials are being discovered in this category of radionuclide ion separation. The adsorption technologies lack the ability of selective removal of metal ions from solution. This drawback is eliminated by the use of ion-imprinted polymers, these materials having targeted binding sites for specific ions in the media. In this review article, we present recently published literature about the use of ion-imprinted polymers for the adsorption of 10 important hazardous radionuclides—U, Th, Cs, Sr, Ce, Tc, La, Cr, Ni, Co—found in the nuclear fuel cycle.

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Topics: Adsorption (54%), Ion exchange (50%)

2 Citations


Journal ArticleDOI: 10.1016/J.JTICE.2021.06.004
Abstract: Background The selective removal of Pb(II) ions is meaningful not only to the waste water treatment but also the lead recycling. Methods In this study, two kinds of thiazole Schiff base modified mesoporous silica, SBA-NS, SBA-ENS, were prepared by modifying SBA-15 with aminopropyl and [2-aminoethylamino]-propyl groups, respectively, and then followed by Schiff condensation with 2-aldehyde-thiazole. The effects of pH, time, ions concentration, and temperature on the Pb(II) adsorption performance were investigated. Significant Findings The kinetics analysis and adsorption isotherms revealed that the overall Pb(II) adsorption process by the two adsorbents was more consistent with the pseudo-second-order kinetic model and Langmuir isotherm model. The thermodynamic parameters showed spontaneous and exothermic Pb(II) adsorption nature onto SBA-NS and SBA-ENS. Compared with amino modified silica precursors, SBA-NS and SBA-ENS exhibited improved adsorption selectivity for Pb(II) in binary metal ion systems with co-existing cations. Besides, the adsorption behavior is not affected by the ionic strength, and the adsorbents can be easily reused without significant loss in of Pb(II) removal efficiency. The density functional theory method demonstrated that the imine N atoms on the two adsorbents played a dominant role during the Pb(II) sorption process.

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Topics: Adsorption (60%), Mesoporous silica (55%), Langmuir adsorption model (55%) ... read more

1 Citations


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39 results found


Open accessJournal ArticleDOI: 10.1039/C6CS00061D
Lingxin Chen1, Lingxin Chen2, Xiaoyan Wang3, Xiaoyan Wang1  +3 moreInstitutions (3)
Abstract: Molecular imprinting technology (MIT), often described as a method of making a molecular lock to match a molecular key, is a technique for the creation of molecularly imprinted polymers (MIPs) with tailor-made binding sites complementary to the template molecules in shape, size and functional groups. Owing to their unique features of structure predictability, recognition specificity and application universality, MIPs have found a wide range of applications in various fields. Herein, we propose to comprehensively review the recent advances in molecular imprinting including versatile perspectives and applications, concerning novel preparation technologies and strategies of MIT, and highlight the applications of MIPs. The fundamentals of MIPs involving essential elements, preparation procedures and characterization methods are briefly outlined. Smart MIT for MIPs is especially highlighted including ingenious MIT (surface imprinting, nanoimprinting, etc.), special strategies of MIT (dummy imprinting, segment imprinting, etc.) and stimuli-responsive MIT (single/dual/multi-responsive technology). By virtue of smart MIT, new formatted MIPs gain popularity for versatile applications, including sample pretreatment/chromatographic separation (solid phase extraction, monolithic column chromatography, etc.) and chemical/biological sensing (electrochemical sensing, fluorescence sensing, etc.). Finally, we propose the remaining challenges and future perspectives to accelerate the development of MIT, and to utilize it for further developing versatile MIPs with a wide range of applications (650 references).

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Topics: Molecular imprinting (54%)

1,242 Citations


Journal ArticleDOI: 10.1007/S10532-008-9237-8
01 Jul 2009-Biodegradation
Abstract: Pharmaceuticals and personal care products (PPCPs) have been the focus of much recent research as concerns rise about their occurrence in bodies of water worldwide. In an effort to characterize the risk and determine the prevalence of these micropollutants in lakes and rivers, many researchers are examining PPCP removal from impaired water during wastewater treatment and water recycling (soil passage) processes. Biodegradation studies and projects considering combinations of biodegradation and other removal processes have been conducted over a wide range of compound categories and therapeutic classes, as well as across different systems and scales of study. This review summarizes the extent of PPCP removal observed in these various systems.

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443 Citations


Journal ArticleDOI: 10.1016/J.BIOS.2015.07.013
Lokman Uzun1, Anthony Turner2Institutions (2)
Abstract: In parallel with recent developments in communications, nanotechnology and materials sciences, there has been extraordinary growth in the area of biosensors, with almost half of the total number of papers ever published (1962-2015) appearing in the last five-years (2010-2015). Molecular imprinting offers a route to the creation of specific and selective cavities in a 3D-polymeric network, which are complementary not only to the size and shape of a target species, but also provide interaction points and a coordination sphere around the template molecule. Given the challenges facing biosensor technologists, it is natural that this approach to create potentially highly stable synthetic ligands as an alternative to, or to compliment natural receptors, should emerge as a key line of interdisciplinary research. Despite the profuse amount of recent literature on molecularly-imprinted polymers (MIPs) and some limited commercial activity, these promising materials still need to overcome some limitations before taking their place in analytical market. In this review, we have focused on the most promising advances in MIP-based biosensors to illustrate how close to market they really are. We present our material under five main sections covering computational design, polymerisation strategies, material combinations, recent sensor designs and manufacturing issues. Each section provides technical details and evaluates the effect on sensor performance.

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304 Citations


Open accessJournal ArticleDOI: 10.1080/01919510601039726
Shane A. Snyder1, Eric C. Wert1, David J. Rexing1, Ronald E. Zegers1  +1 moreInstitutions (1)
Abstract: The oxidative removal of a diverse group of trace organic contaminants from surface water and wastewater was evaluated using ozone (O3) and O3 combined with hydrogen peroxide (O3/H2O2). Target compounds included estrogenic and androgenic steroids, pharmaceuticals, pesticides, and industrial chemicals. Bench- and pilot- scale experiments were conducted with surface water spiked with the target compounds and wastewater effluent containing ambient concentrations of target compounds. Full-scale water treatment plants were sampled before and after ozonation to determine if bench- and pilot-scale results accurately predict full-scale removal. In both drinking water and wastewater experiments, the majority of target compounds were removed by greater than 90% at O3 exposures commonly used for disinfection. Atrazine, iopromide, meprobamate, and tris-chloroethylphosphate (TCEP) were the most recalcitrant compounds to oxidize using O3, with removals generally less than 50%. The addition of H2O2 for advanced oxidatio...

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Topics: Wastewater (59%), Advanced oxidation process (59%), Water treatment (55%) ... read more

304 Citations


Journal ArticleDOI: 10.1016/J.REACTFUNCTPOLYM.2013.03.021
Abstract: Selective recognition of metal ions is a real challenge for a large range of applications in the analytical field (from extraction to detection and quantification). For that purpose, ion-imprinted polymers (IIPs) have been increasingly developed during the last 15 years on the principle of molecularly imprinted polymers (MIPs). Those imprinted materials are designed to mimic the binding sites of biological entities and assure an improved recognition of the template species. The aim of this review is to give the current state of the art in the conception of IIPs from the components to the polymerization process. Some applications of those materials will be also discussed.

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225 Citations