Elektro Eğirme Yöntemi Kullanılarak Ag Aşılanmış ZnO Nano Fiberlerin Sentezi ve Foto Katalitik Aktivitelerinin İncelenmesi

%1 ve %3 gümüş (Ag) içeren Ag aşılanmış çinko oksit (ZnO) nano fiberler elektro eğirme yöntemi kullanılarak hazırlanmış ve yapısal, şekilsel ve foto katalitik özellikleri incelenmiştir. Saf ZnO nano fiberler de yapı ve özelliklerin karşılaştırılması amacı ile aynı yöntemle sentezlenmişlerdir, Ag aşılanmış ZnO nano fiberlerin foto katalitik özellikleri UV ışığı altında metilen mavisini bozma eğiliminin Ag miktarına bağlı olarak değişiminin bir fonksiyonu olarak belirlenmiştir. Ag aşılama ile fiberlerin foto katalitik aktivitelerinin geliştiği ve yüksek miktarda Ag miktarının eklenmesi ile metilen mavisinin bozunum oranının daha iyi olduğu bulunmuştur. Saf ZnO fiberler ile 270 dakikalık UV ışımasından sonra boyanın bozunum miktarının %52 oranında olduğu tespit edilmiştir. Aynı ışıma suresinde %1 Ag içeren fiberlerde boya moleküllerinin bozunum oranı %60 iken, %3 Ag içeren fiberlerde bu oran %77’dir. Ag aşılama ile ZnO fiberlerin foto katalitik aktivitelerinde gözlemlenen iyileşme ZnO kristal yapısında Zn bölgeleri içine Ag iyonlarının yer alan atom olarak geçmesi ile açıklanabilir. Yer alan atom pozisyonunda yerleşme XRD piklerinin pozisyonlarında meydana gelen kayma ile doğrulanmıştır.

SYNTHESIS of Ag-DOPED ZnO NANOFIBERS USING ELECTROSPINNING METHOD and THEIR PHOTOCATALYTIC ACTIVITIES

Silver (Ag) doped zinc oxide (ZnO) nanofibers with 1 at.% and 3 at.% Ag content wereprepared using the electrospinning technique and their structural, morphological and photocatalyticproperties were investigated. Pure ZnO nanofibers were also prepared with the same procedure forstructure and property related comparison purposes. The photocatalytic activity of the Ag doped ZnOnanofibers were determined as a function of Ag content by exploring the degradation behavior ofmethylene blue under UV light irradiation. It was found that photocatalytic ability of fibers wasimproved with Ag addition and higher Ag incorporation resulted higher methylene blue degradationrate. For pure ZnO fibers, the degraded amount of dye was 52% of its initial amount after 270 min of UVirradiation time. For the same irridation time, 60% and 67% decomposition ratios of the dye moleculeswere achieved with the fibers containing 1 at.% Ag and 3 at.% Ag, respectively. The origin of theimprovement of photocatalytic activity in Ag doped ZnO nanofibers was attributed to the substitutionalincorporation of Ag ions into Zn sites within the ZnO crystal. The substitutional incorporation has beenproved with the positional shift of the XRD diffraction lines.

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