Polymer composite adsorbents using particles of molecularly imprinted polymers or aluminium oxide nanoparticles for treatment of arsenic contaminated waters

Önnby, Linda; Pakade, Vusumzi Emmanuel; Mattìasson, Bo; Kirsebom, Harald

doi:10.1016/j.watres.2012.05.028

Cited by 109 publications

(54 citation statements)

References 34 publications

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“…As a whole, this is useless presentation of the textural characteristics of the cryogels. Cryogels with molecular-imprinted polymers have attracted increased attention because of significant enhancement of the selectivity of the materials used as adsorbents [234,243]. Additionally, functionalisation of cryogels can be used for the same purposes.…”

Section: Diffusion Of Small Molecules Polymers Proteins and Cells Wmentioning

confidence: 99%

Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

286

205

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*Graphical Abstract (for review)Cryotripic gelation technique allows the synthesis of solid and soft macroporous gels Textural characterisation of cryogel in native superhydrated state with noninvasive methods Adsorption and diffusion characteristics of macroporous cryogels with respect to macromolecules and cells Theoretical modelling of adsorption from aqueous media *Highlights (for review) Please find the revised manuscript entitled "Cryogels: morphological, structural and adsorption characterisation" by Vladimir M. Gun'ko, Irina N. Savina, Sergey V. Mikhalovsky to re-consider for publication in the "Advances in Colloid and Interface Science"The paper was completely edited and changed according to reviewers comments.Sincerely yours, Prof. V. M. Gun'koCover Letter ABSTRACTExperimental results on polymer, protein, and composite cryogels and data treatment methods used for morphological, textural, structural, adsorption and diffusion characterisation of the materials are analysed and compared. Treatment of microscopic images with specific software gives quantitative structural information on both native cryogels and freeze-dried materials that is useful to analyse the drying effects on their structure. A combination of cryoporometry, relaxometry, thermoporometry, small angle X-ray scattering (SAXS), equilibrium and kinetic adsorption of low and high-molecular weight compounds, diffusion breakthrough of macromolecules within macroporous cryogel membranes, studying interactions of cells with cryogels provides a consistent and comprehensive picture of textural, structural and adsorption properties of a variety of cryogels. This analysis allows us to establish certain regularities in the cryogel properties related to narrow (diameter 0.4 < d < 2 nm), middle (2 < d < 50 nm) and broad (50 < d < 100 nm) nanopores, micropores (100 nm < d < 100 m) and macropores (d > 100 m) with boundary sizes within modified life science pore classification. Particular attention is paid to water bound in cryogels in native superhydrated or freeze-dried states. At least, five states of water -free unbound, weakly bound (changes in the Gibbs free energy G < 0.5-0.8 kJ/mol) and strongly bound (G > 0.8 kJ/mol), and weakly associated (chemical shift of the proton resonance  H = 1-2 ppm) and strongly associated ( H = 3-6 ppm) waters can be distinguished in hydrated cryogels using 1 H NMR, DSC, TSDC, TG and other methods. Different software for image treatment or developed to analyse the data obtained with the adsorption, diffusion, SAXS, cryoporometry and thermoporometry methods and based on regularisation algorithms is analysed and used for the quantitative morphological, structural and adsorption characterisation of individual and composite cryogels, including polymers filled with solid nano-or microparticles.

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Section: Diffusion Of Small Molecules Polymers Proteins and Cells Wmentioning

confidence: 99%

Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

286

205

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“…Figure 6 presented the adsorption quantity (Q) of E2 by MMIC, MMIP, MNIC and MNIP after 5,10,15,20,30,40,50, 60 min. All experiments were performed in triplicate.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…28 Various molecular imprinting strategies, including mixed template, dummy template, pending template, have been utilized in the synthesis of MICs with different template molecules. [29][30][31][32] Synthetic estrogens, such as estradiol (E2), show strong endocrine disruption impacts on the hormone balance in an organism even under extremely low concentrations, due to their similar biological effects to that of endogenous hormones. 33,34 Estrogen can enter and store in the human body through the food chain and cause toxic and side effects.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of an Estradiol Templated Magnetic Sphere of Molecularly Imprinted Cryogel

Wang¹,

Tian²,

Yan³

et al. 2017

J. Braz. Chem. Soc.

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An estradiol templated core-shell magnetic molecularly imprinted cryogel (MMIC) was synthesized to selectively extract and analyze estradiol in milk powder. The microsphere of Fe 3 O 4 @SiO 2 was firstly prepared on Fe 3 O 4 with ethyl silicate and 3-methyl propyl trimethoxy silane. Then the polymerization of α-methacrylic acid and ethylene glycol dimethyl acrylate was carried out on Fe 3 O 4 @SiO 2 at −20 °C for 24 h with estradiol as template. The morphology and microstructure of MMIC were investigated by transmission electron microscopy and infrared spectrogram. When used as chromatographic stationary phase, MMIC showed good selectivity and chromatographic performance for the template. Spiked milk powder samples were used to examine the adsorption capacity and selectivity of MMIC, giving recoveries of 92-101% and limit of detection 0.8-1.2 ng g −1 .Experimental results indicate good reproducibility with relative standard deviation from 2.2 to 4.5% (n = 3) at spiked levels of estradiol 10, 50, and 100 ng g -1 .Keywords: magnetic sphere, molecularly imprinted cryogel, estradiol, milk powder IntroductionSample preparation is of vital importance in an analysis for reducing the interference of impurities, concentrating the low abundant components, and improving the sensitivity and selectivity. Sample pretreatment occupies more than 60% of the entire time, while it presents poor reproducibility and accuracy. Thus, a sound sample pretreatment is crucial to guarantee the accuracy, reliability of the results, as well as the efficiency of analytical determination. Solid phase extraction (SPE) has widely been used in the extraction, purification, and enrichment of analytes in environmental, food, and biological samples. However, SPE cannot eliminate the interference of matrix in complex samples because the conventional adsorbents, such as normal, reverse, and ionic phase and other special adsorbents, have poor selectivity. Molecularly imprinted polymer (MIP) is a kind of inclusive compound prepared from template, monomer, and cross linker. There is a covalent bond or hydrogen bond or Van der Waals' force between template and polymer.2 When template molecule is removed, a specific cavity with binding sites complementary to the size, shape, and functional group of template is formed in the polymer.2 Molecularly imprinted polymers based solid phase extraction (MIP-SPE) can be implemented in selective separation, analysis, and preparation of high-purity target substance. MIP-SPE can achieve rapid and high efficiency of extraction of the analytes, because of high specific surface area and high mass transfer rate. 3,4Core-shell magnetic molecularly imprinted polymer (MMIP) is a new type of functional composite, the magnetic core (such as Fe 3 O 4 ) of which is covered with inorganic (SiO 2 , Al 2 O 3 , etc.) or organic (surfactant, polymer, etc.) layers. [5][6][7] The layer can be further modified with hydrophilic and/or biocompatible functional groups, including C=C, -NH-, -Br and sulfonyl, then dipole interaction of core is...

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“…Arsenic exists in multiple oxidation states (+5, +3, 0 and -3); arsenate As (V) and arsenite As (III) are the most common inorganic forms of arsenic in aquatic environments. and greater mobility, which needs to be oxidized for better adsorbption of As (V) (8,11). Arsenic in aqueous systems can originate from natural sources (e.g., geochemical reactions and volcanic emissions) as well as anthropogenic activities (such as metal mining, industrial waste discharge, and agricultural use of arsenical pesticides) (12).…”

Section: Introductionmentioning

confidence: 99%

Removal of Arsenic and Coliform Bacteria by Modified Sand Filter With Slag and Zeolite from Drinking Water

et al. 2017

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Background: Among the various adverse pollutants in water, coliform bacteria and arsenic are very important. Drinking of arseniccontaminated water has become a serious threat to public health and has affected millions of people across the world. Objectives: The aim of this study was to investigate the removal of arsenic and coliform bacteria from drinking water in small communities with the use of a conventional Slow Sand Filter (SSF) and modified filter by slag (SMF) and Zeolite (ZMF). Methods: In this study, initial concentrations of arsenic were 0.073, 0.11, 0.171, 0.21, 0.24, and 0.33 mg/l and the initial number of coliform bacteria was 4*10 6 MPN/100 mL. Arsenic and coliform bacteria samples were taken every 24 and 48 hours, respectively.

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Polymer composite adsorbents using particles of molecularly imprinted polymers or aluminium oxide nanoparticles for treatment of arsenic contaminated waters

Cited by 109 publications

References 34 publications

Cryogels: Morphological, structural and adsorption characterisation

Cryogels: Morphological, structural and adsorption characterisation

Preparation and Performance of an Estradiol Templated Magnetic Sphere of Molecularly Imprinted Cryogel

Removal of Arsenic and Coliform Bacteria by Modified Sand Filter With Slag and Zeolite from Drinking Water

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