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    Nano-biosorbents for contaminant removal: An introduction
    (Elsevier, 2022) Cimen, Duygu; Gokturk, Ilgim; Calisir, Merve; Yilmaz, Fatma; Denizli, Adil
    In recent years, nanobiopolymers such as nanochitin, nanocellulose, nanostarch, nanosilk, and microbial produced by living organisms have received a wide range of attention in different fields of science and engineering. Nanobiopolymers are sustainable and biodegradable compared to petroleum-based synthetic polymers. While synthetic polymer materials are the most used materials in recent times, they have brought serious problems affecting human health, environment and nature. Nanobiopolymers with unique structural properties resulting from nano-dimensional effects such as ultra-high aspect ratio and length-to-diameter ratio are produced by a variety of mechanical, chemical and synthetic biology techniques. These properties ensure their machinability. Nanobiopolymers, which are successfully produced from agriculture, nature, and forestry products such as cotton, wood, silk fibers, coconut, shrimp/crab shell, wheat, rice and potatoes, are used in a wide range of high-tech areas such as transparent display panels, while ultrafiltration membranes, energy storage devices and catalytic as supports. This section demonstrates the manufacturing techniques for producing nano biopolymers and then summarizes the most recently reported applications of nanobiopolymers for decontamination of environmental pollutants. © 2022 Elsevier Inc. All rights reserved.
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    Removal of iron by chelation with molecularly imprinted supermacroporous cryogel
    (Taylor & Francis Ltd, 2016) Cimen, Duygu; Gokturk, Ilgim; Yilmaz, Fatma
    Iron chelation therapy can be used for the selective removal of Fe3+ ions from spiked human plasma by ion imprinting. N-Methacryloyl-(L)-glutamic acid (MAGA) was chosen as the chelating monomer. In the first step, MAGA was complexed with the Fe3+ ions to prepare the precomplex, and then the ion-imprinted poly(hydroxyethyl methacrylate-N-methacryloyl-(L)-glutamic acid) [PHEMAGA-Fe3+] cryogel column was prepared by cryo-polymerization under a semi-frozen temperature of -12 degrees C for 24 h. Subsequently, the template, of Fe3+ ions was removed from the matrix by using 0.1 M EDTA solution. The values for the specific surface area of the imprinted PHEMAGA-Fe3+ and non-imprinted PHEMAGA cryogel were 45.74 and 7.52 m(2)/g respectively, with a pore size in the range of 50-200 mm in diameter. The maximum Fe3+ adsorption capacity was 19.8 mmol Fe3+/g cryogel from aqueous solutions and 12.28 mmol Fe3+/g cryogel from spiked human plasma. The relative selectivity coefficients of ion-imprinted cryogel for Fe3+/Ni2+ and Fe3+/Cd2+ were 1.6 and 4.2-fold greater than the non-imprinted matrix, respectively. It means that the PHEMAGA-Fe3+ cryogel possesses high selectivity to Fe3+ ions, and could be used many times without significantly decreasing the adsorption capacity.