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    Öğe
    Magnetically responsive chitosan-based nanoparticles for remediation of anionic dyes: Adsorption and magnetically triggered desorption
    (Elsevier Science Sa, 2022) Babacan, Taner; Dogan, Deniz; Erdem, Umit; Metin, Aysegul Ulku
    Chitosan-based nanoparticles (PGMA/mCHT) were prepared for the adsorption of anionic Reactive Red 120 (RR120) and Indigo Carmine (IC). The morphology and characteristics were clarified by using SEM-EDX, XRD, VSM, and FTIR. The adsorption of RR120 and IC on PGMA/mCHT was carried out in a batch process to determine the influence of initial dye concentration (5-600 mg/L), initial pH (3-9), temperature (5, 25, 35, and 45 degrees C) and contact time. Under acidic conditions, higher adsorption efficiencies of the PGMA/mCHT nanoparticles due to intermolecular interactions of dye molecules between the protonated amine groups and the sulfonyl groups. Bi-solute adsorption was also investigated revealing between dye molecules has no competitive effect at the same initial concentration. The kinetic results of RR120 and IC adsorption onto PGMA/mCHT nanoparticles fit well to the pseudo-second-order model. The desorption of dye molecules from PGMA/mCHT nanoparticles was also studied using an alternating magnetic field which is caused the superior desorption behavior demonstrating the magnetic nanoparticles can be acted as a nanoheater.
  • Küçük Resim
    Öğe
    Manyetik biyopolimerik nanopartiküllerin sentezi ve karakterizasyonu
    (Kırıkkale Üniversitesi, 2020) Babacan, Taner; Metin, Ayşegül Ülkü
    Bu tez çalışmasında, nano boyutta manyetik özellikteki kitosan-aşı-poli(glisidil metakrilat) partikülleri radikalik polimerizasyon yöntemi ile sentezlendi ve yapısal ve morfolojik özellikleri FTIR, SEM-EDS, VSM, XRD ve TGA yöntemleri ile aydınlatıdı. Daha sonra, manyetik özellikteki nanopartiküller iki farklı yol kullanılarak anyonik boyaların (RR-120 ve IC) giderilmesinde kullanıldı. İlk bölümde, manyetik nanopartikül yapısındaki fonksiyonel epoksi grubu 1,6-diaminohekzan kullanılarak amin gruplarına dönüştürüldü ve adsorpsiyon yolu ile anyonik boyaların uzaklaştırılmasında etkinliği araştırıldı. Adsorpsiyon kos¸ullarının (pH, adsorpsiyon denge su¨resi, iyonik s¸iddet, sıcaklık, bas¸langıc¸ boya deris¸imi gibi) manyetik nanopartiku¨llerin boyaları adsorplama performansına etkisi incelendi. Bununla birlikte, adsorpsiyon kinetigˆi ve izoterm modeli ile manyetik nano partiku¨llerin yeniden kullanılabilirligˆi gibi parametreler de belirlendi. Manyetik kitosan-aşı-poli(glisidil metakrilat) nanopartiküllerinin RR-120 ve IC için maksimum adsorpsiyon kapasiteleri sırası ile pH 5.0 ve 3.0'de 241 mg/g ve 185 mg/g olarak belirlendi. Manyetik nanopartiku¨llerin adsorpsiyon kapasitesinde o¨nemli bir azalma olmadan adsorpsiyon-desorpsiyon is¸lem do¨ngu¨lerinde yeniden kullanılabilir olduğu belirlendi. Tez c¸alıs¸masının ikinci bo¨lu¨mu¨nde, manyetik kitosan-aşı-poli(glisidil metakrilat) nanopartiküllerinin, mCHT-PGMA, epoksi grupları EDA kullanılarak amin gruplarına do¨nu¨s¸tu¨ru¨ldu¨. Lakkaz enzimi, GA kullanılarak kovalent bağlanma yöntemi ile immobilize edildi ve immobilize edilen enzim miktarı 70 ? 0,21 mg/g olarak hesaplandı. İmmobilize enzimin aktivitesine pH ve sıcaklık gibi parametrelerin etkisi belirlenerek, serbest enzim ile karşılaştırıldı ve lakkaz immobilize mCHT-PGMA nanoku¨releri RR-120 ve IC boyalarının giderilmesinde kullanıldı. Anahtar Kelimeler: Manyetik Nanopartikül, Kitosan, Aşı Kopolimer.
  • Küçük Resim
    Öğe
    Preparation of a novel functionalized magnetic nanobiocomposite as a carrier for protein adsorption
    (TAYLOR & FRANCIS INC, 2020) Metin, Aysegul Ulku; Dogan, Mustafa; Erdem, Umit; Babacan, Taner; Gungunes, Hakan
    This study aims the synthesis of a novel functionalized magnetic nanocarrier based on xanthan gum biopolymer. Glycidyl methacrylate was grafted on xanthan gum chains by radical polymerization reaction using two types of initiators: ammonium persulfate and benzoyl peroxide. Characterization studies of the magnetic nanocarrier were performed using several instruments such as Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Energy-Dispersive-X-Ray Spectroscopy, X-Ray Diffraction Spectroscopy, Transmission Electron Microscopy, Mossbauer Spectroscopy, and Vibrating Sample Magnetometer. According to the Vibrating Sample Magnetometer data and Mossbauer analysis, Fe atoms were incorporated successfully in the polymer chains in Fe3+ state and magnetic nanocarrier has super-paramagnetic behavior, respectively. Epoxy groups on magnetic nanoparticles were converted to carboxylic acid groups using iminodiacetic acid and then tested to usability as a carrier for immobilization of proteins such as albumin, lipase and cytochrome c. The adsorption of albumin and lipase on magnetic nanoparticles were pH-dependent while cytochrome c was immobilized in a wide range of pH value. The calculated maximum experimental immobilization capacity of magnetic nanoparticles was 65.10 mg g(-1), 62.0 mg g(-1) and 188.0 mg g(-1) for albumin, lipase and cytochrome c, respectively. Experimental data fitted to Langmuir isotherm better than Freundlich. The rate of cytochrome c adsorption followed the pseudo-second-order kinetic. Results showed that the functionalized magnetic nanoparticles can be effectively used as a carrier for protein separations, especially for cytochrome c. Moreover, the functionalized magnetic nanocarrier had high affinity to Cytochrome c protein even in multiple protein systems.