ZnO-Kitosan Kompoziti ile Ağır Metal Giderimi

Yıl 2022, Cilt , Sayı 35, 603 - 609, 30.04.2022

Gamze TOPAL CANBAZ Unsal AÇIKEL Yeşim SAĞ AÇIKEL

https://doi.org/10.31590/ejosat.1094734

Öz

Çalışmada Allium cepa (A. cepa) kabukları kullanılarak yeşil sentez ile ZnO partikülleri sentezlendi ve kitosan (Ch) ile oluşturulan ZnO- Ch kompozitin Nikel (II) (Ni (II)) giderim potansiyeli incelendi. Sentezlenen ZnO-Ch kompozitin taramalı elektron mikroskopisi (SEM), Fourier transform infrared (FTIR) ve X-ışını difraksiyonu (XRD) ile karakterizasyonu gerçekleştirildi. Çalışmada ZnO-Ch kompoziti ile kesikli sistemde Ni (II) adsorpsiyonu için pH (2,0-6,0), sıcaklık (25-55 oC), adsorban miktarı (0,25-1,0 g/L),temas süresi (15-1440 dk) ve başlangıç kirletici derişimi (20-300 mg/L) incelenerek optimum giderim koşulları incelenmiştir. Elde edilen optium koşullar pH 5,0, sıcaklık 25 0C, adsorban miktarı 0,5 g/L, temas süresi 300 dakika (dk) olarak belirlenmiştir. Ni (II) gideriminde kompozitin maksimum adsorpsiyon kapasitesi Langmuir izoterm modeline göre 222,22 mg/g olarak hesaplandı. Yapılan sıcaklık çalışmalarında artan sıcaklık ile adsorpsiyon kapasitesinin düşmesi sistemin ekzotermik olduğunu gösterdi.

Anahtar Kelimeler

ZnO, kitosan, Ni(II), adsorpsiyon

Heavy Metal Removal with ZnO-Chitosan Composite

Öz

In the study, ZnO particles were synthesized by green synthesis using Allium cepa (A. cepa) shells and the Nickel (II) (Ni (II)) removal potential of the ZnO-Ch composite formed with chitosan (Ch) was investigated. Characterization of the synthesized ZnO-Ch composite was performed by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray diffraction (XRD). In the study, pH (2,0-6,0), temperature (25-55 oC), amount of adsorbent (0,,25-1,0 g/L), contact time for Ni (II) adsorption in batch system with ZnO-Ch composite. (15-1440 min) and initial pollutant concentration (20-300 mg/L) were examined and optimum removal conditions were investigated. The optimum conditions obtained were determined as pH 5,0, temperature 25 0C, amount of adsorbent 0,5 g/L, contact time 300 minutes (min). The maximum adsorption capacity of the composite in Ni (II) removal was calculated as 222,22 mg/g according to the Langmuir isotherm model. In temperature studies, the decrease in adsorption capacity with increasing temperature showed that the system was exothermic.

Anahtar Kelimeler

ZnO, Chitosan, Ni (II), adsorption

Kaynakça

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