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George Z Kyzas, Panoraia I Siafaka, Margaritis Kostoglou, Dimitrios N Bikiaris
This work investigates the removal of arsenic ions in trivalent (As(III)) or pentavalent form (As(V)) from single-component and binary (equal initial ion concentrations) aqueous solutions using commercial cross-linked polyallylamine (namely as Sevelamer) as adsorbent. This is the first work in literature regarding the application of that commercial material as adsorbent for ions. Sevelamer (SVL) is a widely known pharmaceutical compound and the existence of primary and secondary amino groups (with different ratios) in its molecule increases its adsorption potential...
July 15, 2016: Journal of Colloid and Interface Science
Zoi Terzopoulou, Myrsini Papageorgiou, George Z Kyzas, Dimitrios N Bikiaris, Dimitra A Lambropoulou
In the present study, a molecularly imprinted solid-phase microextraction fiber (MIP-SPMEf) was synthesized and applied for the selective removal and extraction of the antiviral drug, abacavir (ABA). Morphology and structure characterization of fibers were performed by scanning electron microscopy and Fourier transform infrared spectra, respectively. The effects on the adsorption behavior of the process parameters were studied and the equilibrium data were fitted by the Langmuir, Freundlich and Langmuir-Freundlich models...
March 24, 2016: Analytica Chimica Acta
S Liu, Y Luo, J Fu, J Zhou, G Z Kyzas
The glucocorticoid receptor (GR) antagonistic activities of hydroxylated polychlorinated biphenyls (HO-PCBs) were recently characterised. To further explore the interactions between HO-PCBs and the GR, and to elucidate structural characteristics that influence the GR antagonistic activity of HO-PCBs, molecular docking and three-dimensional quantitative structure-activity relationship (3D-QSAR) studies were performed. Comparative molecular similarity indices analysis (CoMSIA) was performed using both ligand- and receptor-based alignment schemes...
2016: SAR and QSAR in Environmental Research
George Z Kyzas, Anastasia Koltsakidou, Stavroula G Nanaki, Dimitrios N Bikiaris, Dimitra A Lambropoulou
The aim of the present study is the evaluation of graphene oxide (GhO) as adsorbent material for the removal of beta-blockers (pharmaceutical compounds) in aqueous solutions. The composition and morphology of prepared materials were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Atenolol (ATL) and propranolol (PRO) were used as model drug molecules and their behavior were investigated in terms of GhO dosage, contact time, temperature and pH. Adsorption mechanisms were proposed and the pH-effect curves after adsorption were discussed...
December 15, 2015: Science of the Total Environment
Siying Liu, Jia Liu, Juanjuan Zhao, Dongsheng Xia, Fei Pan, Ci Liu, George Z Kyzas, Jie Fu
To investigate the effects of palygorskite on chemical forms of heavy metal and microbial functional diversity in the sewage sludge composting, a compost matrix of sewage sludge, wheat straw and varying contents of palygorskite were inoculated with the compound microbial preparation. The chemical speciation analysis by a Community Bureau of Reference-sequential extraction indicated the contribution of palygorskite to reduce the bioavailability of a model metal, Cu, during the composting process. The Biolog EcoPlate(TM) test revealed that the microbial community showed better capability of utilizing complex macro-molecules (such as miscellaneous and polymers) in the presence of palygorskite...
2015: Environmental Technology
George Z Kyzas, Stavroula G Nanaki, Anastasia Koltsakidou, Myrsini Papageorgiou, Maria Kechagia, Dimitrios N Bikiaris, Dimitra A Lambropoulou
In the present study, two novel molecularly imprinted polymers (MIPs) with remarkable recognition properties for metformin and its transformation product, guanylurea, have been prepared for their selective, enrichment, isolation and removal from aqueous media. The prepared adsorbents were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and swelling experiments. The performance of the prepared MIPs was evaluated by various parameters including the influence of pH, contact time, temperature and initial compound concentration...
March 25, 2015: Analytica Chimica Acta
Stavroula G Nanaki, George Z Kyzas, Areti Tzereme, M Papageorgiou, Margaritis Kostoglou, Dimitrios N Bikiaris, Dimitra A Lambropoulou
In the present study, carrageenan microparticles were synthesized using spray-drying method and used as biosorbents for the removal of pharmaceutical compounds. The cross-linking reaction of iota-carrageenan (iCAR) and kappa-carrageenan (kCAR) with glutaraldehyde (GLA) at different concentrations (2.5% or 5% (w/w), mass of GLA per mass of CAR) was studied (iCAR/GLA2.5, iCAR/GLA5, kCAR/GLA2.5, kCAR/GLA5). The physicochemical properties of the novel cross-linked polymers were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR)...
March 1, 2015: Colloids and Surfaces. B, Biointerfaces
George Z Kyzas, Dimitrios N Bikiaris
Chitosan is considered to be one of the most promising and applicable materials in adsorption applications. The existence of amino and hydroxyl groups in its molecules contributes to many possible adsorption interactions between chitosan and pollutants (dyes, metals, ions, phenols, pharmaceuticals/drugs, pesticides, herbicides, etc.). These functional groups can help in establishing positions for modification. Based on the learning from previously published works in literature, researchers have achieved a modification of chitosan with a number of different functional groups...
January 2015: Marine Drugs
George Z Kyzas, Panoraia I Siafaka, Dimitrios N Bikiaris, Emmanuel N Koukaras, George E Froudakis
In this study, an alternative use of Sevelamer carbonate (SEV, a cross-linked polyallylamine which is a widely known pharmaceutical compound) was suggested. The existence of primary and secondary amino groups (with different ratios) in its molecule increases its adsorption potential and use as biosorbent material. SEV was tested as biosorbent material aiming the removal of heavy metals and dyes from simulated effluents. As heavy metals and dyes, hexavalent chromium (Cr(VI)) and Remazol Brilliant Blue RN (RB) were used, respectively...
March 15, 2015: Journal of Colloid and Interface Science
George Peat, Richard D Riley, Peter Croft, Katherine I Morley, Panayiotis A Kyzas, Karel G M Moons, Pablo Perel, Ewout W Steyerberg, Sara Schroter, Douglas G Altman, Harry Hemingway
No abstract text is available yet for this article.
July 2014: PLoS Medicine
George Z Kyzas, Eleni A Deliyanni, Nikolaos K Lazaridis
In this study, impregnation of microporous activated carbon with magnetite was achieved by co-precipitation of iron salts onto activated carbon. The evaluation of the adsorption ability of this material was examined using the anionic dye Reactive Black 5 as model dye pollutant (adsorbate). The effect of pH, ionic strength, contact time and initial dye concentration were also studied. It was found that high pH and high ionic strength favor the adsorption of Reactive Black 5. The adsorption kinetics and isotherms were well fitted by the fractal BS model and Langmuir model, respectively...
September 15, 2014: Journal of Colloid and Interface Science
Jie Fu, Changpo Zhao, Yupeng Luo, Chunsheng Liu, George Z Kyzas, Yin Luo, Dongye Zhao, Shuqing An, Hailiang Zhu
This work investigated heavy metal pollution in surface sediments of the Jialu River, China. Sediment samples were collected at 19 sites along the river in connection with field surveys and the total concentrations were determined using atomic fluorescence spectrometer and inductively coupled plasma optical emission spectrometer. Sediment samples with higher metal concentrations were collected from the upper reach of the river, while sediments in the middle and lower reaches had relatively lower metal concentrations...
April 15, 2014: Journal of Hazardous Materials
George Z Kyzas, Dimitrios N Bikiaris, Mykola Seredych, Teresa J Bandosz, Eleni A Deliyanni
A novel graphite oxide/poly(acrylic acid) grafted chitosan nanocomposite (GO/CSA) was prepared and used as biosorbent for the removal of pharmaceutical compound (dorzolamide) from biomedical synthetic wastewaters. The performance was evaluated taking into account pH, kinetics and thermodynamics of adsorption. GO/CSA presented higher adsorption capacity in comparison with the parent materials (graphite oxide and poly(acrylic acid) grafted chitosan). All adsorbents prepared were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and potentiometric titration...
2014: Bioresource Technology
Nicola R Jaffa, Danny Adam, Shakeel Akhtar, Panayiotis A Kyzas
CONTEXT: Pancreatic adenocarcinoma metastasizing to the mandible is extremely rare, with only 4 previous cases reported in the literature. Here, we present a patient with a metastatic lesion in the mandible as the initial manifestation of pancreatic adenocarcinoma. We also review the incidence, diagnosis, and management of this rare occurrence. CASE REPORT: A 45-year-old man with a 5-week history of pain, following a tooth extraction, was referred to our Oral & Maxillofacial Department and presented with a nonhealing socket in the mandibular premolar region...
January 2014: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
George Z Kyzas, Panoraia I Siafaka, Dimitra A Lambropoulou, Nikolaos K Lazaridis, Dimitrios N Bikiaris
Two novel chitosan (CS) adsorbents were prepared in powder form, after modification with the grafting of itaconic acid (CS-g-IA) and cross-linking with either glutaraldehyde (CS-g-IA(G)) or epichlorohydrin (CS-g-IA(E)). Their adsorption properties were evaluated in batch experiments for Cd(II) or Pb(II) uptake. Characterization techniques were applied to the prepared adsorbents as swelling experiments, TGA, SEM, XRD, and FTIR. Adsorption mechanisms were suggested for different pH conditions. Various adsorption parameters were determined as the effect of pH, contact time, and temperature...
January 14, 2014: Langmuir: the ACS Journal of Surfaces and Colloids
George Z Kyzas, Nikolina A Travlou, Eleni A Deliyanni
The present study focuses on the role of chitosan (CS) as nanofiller of graphite oxide (GO) in order to prepare composite materials with improved Hg(II) adsorption properties. The removal of Hg(II) from aqueous solutions was studied using adsorbents as graphite oxide (GO), graphite oxide nanofilled with chitosan (GO/CS) and magnetic chitosan (GO/mCS). Many possible interactions between materials and Hg(II) were observed after adsorption and explained via characterization with various techniques (SEM/EDAX, FTIR, XRD, DTG)...
January 1, 2014: Colloids and Surfaces. B, Biointerfaces
George Z Kyzas, Nikolaos K Lazaridis, Margaritis Kostoglou
In the present work, the simultaneous adsorption of Remazol Red 3BS (reactive dye) and Cr(VI) onto chitosan powder grafted with poly(ethylene imine) and cross-linked with epichlorohydrin is experimentally studied. Such a combination of a dye molecule and a heavy metal can be found in real/practical conditions of environmental pollutants' removal, so their mutual interaction on the adsorption efficiencies is very important. The experimental data revealed a competitive type of interaction between the dye molecule and heavy metal ion...
October 1, 2013: Journal of Colloid and Interface Science
George Z Kyzas, Eleni A Deliyanni
Two modified chitosan derivatives were prepared in order to compare their adsorption properties for Hg(II) removal from aqueous solutions. The one chitosan adsorbent (CS) is only cross-linked with glutaraldehyde, while the other (CSm), which is magnetic, is cross-linked with glutaraldehyde and functionalized with magnetic nanoparticles (Fe3O4). Many possible interactions between materials and Hg(II) were observed after adsorption and explained via characterization with various techniques (SEM/EDAX, FTIR, XRD, DTG, DTA, VSM, swelling tests)...
2013: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Richard D Riley, Jill A Hayden, Ewout W Steyerberg, Karel G M Moons, Keith Abrams, Panayiotis A Kyzas, NĂºria Malats, Andrew Briggs, Sara Schroter, Douglas G Altman, Harry Hemingway
Prognostic factor research aims to identify factors associated with subsequent clinical outcome in people with a particular disease or health condition. In this article, the second in the PROGRESS series, the authors discuss the role of prognostic factors in current clinical practice, randomised trials, and developing new interventions, and explain why and how prognostic factor research should be improved.
2013: PLoS Medicine
Nikolina A Travlou, George Z Kyzas, Nikolaos K Lazaridis, Eleni A Deliyanni
In the current study, the functionalization of graphite oxide (GO) with magnetic chitosan (Chm) was investigated to prepare a nanocomposite material (GO-Chm) for the adsorption of a reactive dye (Reactive Black 5). The synthesis mechanism was investigated by various techniques (SEM/EDAX, FTIR spectroscopy, XRD, XPS, DTA, DTG, VSM). Characterization results indicated that a significant fraction of the amines of the chitosan (i) were inserted between the GO layers and (ii) reacted with carboxyl and epoxy groups of GO, leading to its reduction and hence the destruction of the layered structure...
February 5, 2013: Langmuir: the ACS Journal of Surfaces and Colloids
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