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

Öz

%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.

Anahtar Kelimeler

• Ag aşılama,Elektro eğirme yöntemi,Foto katalitik özellik,ZnO nano fiberler

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

Abstract

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

Keywords

• Ag doping,Electrospinning method,Photocatalytic property,ZnO nanofibers

Kaynakça

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