Kitosan Kaplı Muz Kabuğu Boncukları ile Sulu Çözeltilerden Krom(VI) Giderimi

Bu çalışmada glutaraldehitle çapraz bağlanmış kitosan kaplamalı muz kabuğu (KMK) performansı, sulu çözeltilerden Cr (VI) iyonlarının adsorpsiyonu ile araştırılmıştır. Farklı deneysel parametrelerin; Cr (VI) iyonlarının farklı konsantrasyonu, pH, adsorban miktarı ve temas süresinin etkileri değerlendirilmiştir. Çözeltide kalan Cr (VI) konsantrasyonu difenilkarbazit ajanı kullanılarak UV-Vis. spektrofotometresi ile belirlenmiştir. KMK boncuklarıyla Cr(VI) adsorpsiyonunda optimum pH değeri 2.0 olarak bulunmuştur. KMK kullanılarak Cr(VI) maksimum giderimleri, pH 2, temas süresi 1 saatte, % 90,2 olarak elde edilmiştir. Çeşitli fonksiyonel gruplar FTIR analiziyle tanımlanmıştır. Adsorpsiyon deneyi denge verilerinin Langmuir modeline daha uygun olduğu belirlenmiştir. KMK için Cr(VI) maksimum adsorpsiyon kapasitesi 102 mg/g olarak bulunmuştur. Sonuçlar, Cr(VI) iyonlarının adsorpsiyonu için KMK’nın uygun adsorban olduğunu göstermiştir.

Chromium(VI) Removal From Aqueous Solutions by Chitosan Coated Banan Peel Beads

In this study, the performance of a cross-linked chitosan coated banana peel (CBP), which has been cross-linked with glutaraldehyde, has been investigated for the adsorption of Cr(VI) ions from aqueous solutions. The influence of different experimental parameters; different concentration of Cr(VI) ions, pH, adsorbent amount and contact time was evaluated. The concentration of Cr(VI) in residual solution was identified by a UV-Vis spectrophotometer using a diphenylcarbazide reagent. pH 2.0 was found to be an optimum pH for Cr(VI) adsorption onto CBP beads. The maximum removal efficiencies were obtained 90.2 % for Cr(VI) by using CBP, at a pH 2, contact time of 1h. Various active functional groups were identified by FTIR analysis. The adsorption experimental equilibrium data was found to best fit to the Langmuir mode. Maximum adsorption capacity of CBP was determined to be 102 mg/g. Results showed that CBP is favourable adsorbent for the adsorption of Cr(VI) ions.

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