Ligand değiştirici monolitik katı faz üzerinde nitroanilinlerin adsorpsiyon davranışlarının incelenmesi
Yükleniyor...
Tarih
2016
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Niğde Ömer Halisdemir Üniversitesi / Fen Bilimleri Enstitüsü
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışmada, doğal olarak oluşan biyomakromolekülden olan hümik asit (HA) kullanılarak yeni tip bir monolitik adsorbanın sentezi ve bazı nitroanilinlerin adsorpsiyonunda ligand değiştirici adsorban olarak kullanılabilirliği incelenmiştir. Kriyojelleşme yöntemine göre hazırlanan metakrilat esaslı kriyojelin yapısına HA, basit bir işlemle immobilize edilmiştir. Disk şeklinde hazırlanan monolitik adsorban (MLHA), Cu(II) iyonu yüklenerek ligand değiştirici şekle dönüştürülmüştür (Cu-MLHA). Çalışmalarda, analit olarak 2-, 3- ve 4-nitroanilin (yani 2-NA, 3-NA ve 4-NA) kullanılmıştır. Elemental analiz, FTIR, SEM, ve çözünürlük testleri gibi yöntem ve tekniklerle karakterizasyon gerçekleştirilmiştir. MLHA'ya bağlanan Cu(II) miktarı atomik absorpsiyon spektroskopisi ile belirlenmiştir. Deneysel parametre olarak, adsorpsiyon süresi, nitroanilin türü (2-NA, 3-NA ve 4-NA) ve konsantrasyonun (50–250 mg/L) kapasite üzerine etkisi çalışılmış ve elde edilen veriler izoterm modellemesi temelinde irdelenmiştir. Sonuçlar; gözlenen adsorpsiyon kapasitesinin 3-NA>4-NA>2-NA sırasında azaldığını göstermiştir. Adsorpsiyon karakterinin özellikle 3-NA için Langmuir modeline uyduğu; 2-NA ve 4-NA için ise Freundlich modelinin daha uyumlu olduğu görülmüştür.
In the present study, the synthesis of a new-type adsorbent that is made up of humic acid (HA), which is a biomacromolecule, and its application as a ligand exchanger in adsorption of nitroanilines were studied. HA was immobilized to a methacrylate-based cryogel through an easy process. The monolithic adsorban (MLHA), which was prepared in a disc form, was converted into a ligand exchanger form by loading of Cu(II) ion (product: Cu-MLHA). In the experiments, 2-nitroniline, 3-nitroaniline, and 4-nitroaniline (i.e. 2-NA, 3-NA, and 4-NA) were used as analytes. The characterization was done by some methods and techniques such as elemental analysis, FTIR, SEM, and solubility tests. The amount of Cu(II) bounded to MLHA was determined by atomic absorption spectroscopy. The effect of some experimental parameters like adsorption time, the type of nitroaniline (i.e. 2-NA, 3-NA, and 4-NA), and the concentration of nitroaniline (i.e. 50-250 mg/L) on adsorption was studied, and the obtained data was scrutinized on the basis of some adsorption isotherm models. The results showed that the observed adsorption capacity decreased in the order of 3-NA>4-NA>2-NA. The adsorption of 3-NA was found to be well described by the Langmuir model, while the Freundlich model was found to fit better to the data of 2-NA and 4-NA.
In the present study, the synthesis of a new-type adsorbent that is made up of humic acid (HA), which is a biomacromolecule, and its application as a ligand exchanger in adsorption of nitroanilines were studied. HA was immobilized to a methacrylate-based cryogel through an easy process. The monolithic adsorban (MLHA), which was prepared in a disc form, was converted into a ligand exchanger form by loading of Cu(II) ion (product: Cu-MLHA). In the experiments, 2-nitroniline, 3-nitroaniline, and 4-nitroaniline (i.e. 2-NA, 3-NA, and 4-NA) were used as analytes. The characterization was done by some methods and techniques such as elemental analysis, FTIR, SEM, and solubility tests. The amount of Cu(II) bounded to MLHA was determined by atomic absorption spectroscopy. The effect of some experimental parameters like adsorption time, the type of nitroaniline (i.e. 2-NA, 3-NA, and 4-NA), and the concentration of nitroaniline (i.e. 50-250 mg/L) on adsorption was studied, and the obtained data was scrutinized on the basis of some adsorption isotherm models. The results showed that the observed adsorption capacity decreased in the order of 3-NA>4-NA>2-NA. The adsorption of 3-NA was found to be well described by the Langmuir model, while the Freundlich model was found to fit better to the data of 2-NA and 4-NA.
Açıklama
Anahtar Kelimeler
Adsorpsiyon, Hümik Asit, İzoterm, Kriyojel, Ligand-değişim, Monolit, Nitroanilin, Adsorption, Cryogel, Humic acid, Isotherm, Ligand-exchange, Monolith, Nitroaniline
Kaynak
WoS Q Değeri
Scopus Q Değeri
Cilt
Sayı
Künye
Şenlik, K. (2016). Ligand değiştirici monolitik katı faz üzerinde nitroanilinlerin adsorpsiyon davranışlarının incelenmesi. (Yüksek Lisans Tezi). Niğde Ömer Halisdemir Üniversitesi, Fen Bilimleri Enstitüsü, Niğde
