Tek moleküllü tabakaların fonksiyonelleştirilmesi ve uygulamaları
Yükleniyor...
Dosyalar
Tarih
2006
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Selçuk Üniversitesi Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışmada silanlama vasıtası olan 3- kloropropiltrimetoksi silan, silika jel yüzeyine kovalent olarak bağlanmış ve ardından 4-kloroizonitroasetofenon 4-aminobenzohirazon (I), izonitroasetofenon 4-aminobenzohidrazon (II), benzofenon 4-aminobenzohidrazon (III) molekülleri immobilize edilmiştir. İmmobilizasyon reaksiyonları infrared spektroskopisi termogravimetri, taramalı elektron mikroskobu, elementel analiz cihazları ile karakterize edilmiştir. Her bir yeni adsorban için Cu(II) metal iyonlarının adsorpsiyonu çalışılmıştır. Bu metal iyonu için adsorpsiyona, adsorban miktarı, adsorpsiyon süresi, pH, metal iyon konsantrasyonu ve sıcaklık etkileri araştırılmıştır. Kesikli kap adsorpsiyon çalışmasının sonuçları Freundlich, Langmuir ve Dubinin-Radushkevich (D-R) izoterm modellerine uygulanmıştır. Her bir adsorban için Cu(II) metal iyonlarının sorpsiyonu Langmuir izotermi ile uyum içinde olarak bulunmuştur. Bu izotermin uygun olup olmadığı Scatchart eğrileri çizilerek doğrulanmıştır. Adsorpsiyon izotermlerinden Cu(II) iyonlarının yüzeye kimyasal reaksiyon ile tutunduğu sonucuna varılmıştır. Adsorpsiyon termodinamiği detaylı olarak çalışılmıştır. Termodinamik parametreler, â H , â Go, â So deneysel sonuçların grafiklere uygulanması ile hesaplanmıştır. Sentezlenmiş o olan her bir yeni adsorban maddenin adsorpsiyon çalışması endotermik olarak bulunmuştur. â Go değeri ise immobilize yüzeylerde Cu(II) iyonlarının adsorpsiyonunun kendiliğinden yürüyen mekanizma ile gerçekleştiğini göstermiştir. Son olarak â So her bir adsorban için pozitif olarak bulunmuştur. Bunlara ilave olarak, adsorpsiyon çalışması sürekli sistem veya kolon prosesi ile de gerçekleştirilmiştir. Sonuçlar Origin 6 programına aktarılarak Breakthrough eğrileri çizilmiştir. Eğrilerin alanlarını hesaplamak sureti ile Cu(II) iyonunun mmol metal iyonu/g adsorban miktarları hesaplanmıştır. Bu değerlerin deney koşullarındaki parametreler ile değişimi grafikler ile gösterilmiştir.
In this study, a silylant precursor agent 3-chloro trimethoxysilane was covalently anchored onto silica gel surface followed by 4-chloroisonitroacethophenone 4- aminobenzylhydrazone, isonitroacetophenone 4-4-aminobenzylhydrazone, benzophenon 4- aminobenzylhydrazone molecules immobilized. The immobilization reaction was confirmed through infrared spectroscopy, thermogravimetry, scanning electron microscopy, elemental analysis instruments. Each new adsorbent was evaluated for adsorption of Cu(II) metal ion. For this metal ion the effects of solution adsorbent quantity, sorption time, pH, metal ion concentration and temperature on the adsorption were investigated. Data obtained from batch studies were evaluated by Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherm models. It was observed that sorption behavior of each adsorbent for Cu(II) metal ions were fitted to the Langmuir isotherm. The isotherms were examined by Scatchart plot analysis whether it fits well or not. From the adsorption isotherms, it was concluded that Cu(II) was sorbed via chemical interactions. The thermodynamics of sorption were studied in detail. Thermodynamic parameters â H , â Go, â So, were calculated from graphical interpretation of the experiment data. For each o new adsorbent standard heat for adsorption (â Ho) was found to be endothermic for adsorption processes. â Go values indicated that adsorption process for Cu(II) on immobilized silica gels are spontaneously occurred. Moreover calculated â So value was found to be positive for adsorption process. I addition, the adsorption process was also studied by column process. The results were interpreted by breakthrough curves using Origin 6, software program. The curves was analyzed by calculating of area under the breakthrough curves and the value of adsorption of Cu(II) was calculated as mmol metal ion /g adsorbent. These values were represented with this graphics.
In this study, a silylant precursor agent 3-chloro trimethoxysilane was covalently anchored onto silica gel surface followed by 4-chloroisonitroacethophenone 4- aminobenzylhydrazone, isonitroacetophenone 4-4-aminobenzylhydrazone, benzophenon 4- aminobenzylhydrazone molecules immobilized. The immobilization reaction was confirmed through infrared spectroscopy, thermogravimetry, scanning electron microscopy, elemental analysis instruments. Each new adsorbent was evaluated for adsorption of Cu(II) metal ion. For this metal ion the effects of solution adsorbent quantity, sorption time, pH, metal ion concentration and temperature on the adsorption were investigated. Data obtained from batch studies were evaluated by Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherm models. It was observed that sorption behavior of each adsorbent for Cu(II) metal ions were fitted to the Langmuir isotherm. The isotherms were examined by Scatchart plot analysis whether it fits well or not. From the adsorption isotherms, it was concluded that Cu(II) was sorbed via chemical interactions. The thermodynamics of sorption were studied in detail. Thermodynamic parameters â H , â Go, â So, were calculated from graphical interpretation of the experiment data. For each o new adsorbent standard heat for adsorption (â Ho) was found to be endothermic for adsorption processes. â Go values indicated that adsorption process for Cu(II) on immobilized silica gels are spontaneously occurred. Moreover calculated â So value was found to be positive for adsorption process. I addition, the adsorption process was also studied by column process. The results were interpreted by breakthrough curves using Origin 6, software program. The curves was analyzed by calculating of area under the breakthrough curves and the value of adsorption of Cu(II) was calculated as mmol metal ion /g adsorbent. These values were represented with this graphics.
Açıklama
Anahtar Kelimeler
Tek moleküllü tabakalar, Monomolecular layers, Fonksiyonelleştirilme, Functionalization
Kaynak
WoS Q Değeri
Scopus Q Değeri
Cilt
Sayı
Künye
Gübbük, İ. H. (2006). Tek moleküllü tabakaların fonksiyonelleştirilmesi ve uygulamaları. Selçuk Üniversitesi, Yayımlanmış doktora tezi, Konya.
