Investigation of the Removal of Methylene Blue with SiCl@AgNP Nanocomposite

Öz

In this study; SiCl@AgNP nanocomposite was synthesized by biosynthesis method using water extract of bay leaf (Laurus nobilis). The structure of the produced nanocomposite was characterized by UV-Vis., FTIR, XRD and SEM techniques. Then, the produced nanocomposite adsorbent was evaluated in the removal of methylene blue (MM), which is a cationic dye, from the aqueous solution. First, the effects of solution pH, initial MM concentration, contact time, adsorbent dose and ambient temperature were investigated among the parameters that may affect the adsorption process. The suitability of the experimental data to the Langmuir, Freundlich and D-R isotherms was analyzed and it was observed that it was compatible with the Langmuir isotherm model. Thermodynamic parameters of Gibbs free energy, entropy and enthalpy change were calculated and the values obtained showed the applicability of MM adsorption and its endothermic character. It has been determined that low-cost SiCl@AgNP nanocomposite produced by biosynthesis method is an effective adsorbent in MM dyestuff removal from aqueous solution. In addition, it has been suggested that the produced nanocomposite adsorbent can be used in the removal of other cationic dyestuffs.

Anahtar Kelimeler

• Biosynthesis
• Leave of daphne
• AgNP
• Nanocompozit
• Methylene blue
• Removal

Metilen Mavisinin SiCl@AgNP Nanokompoziti ile Gideriminin İncelenmesi

Öz

Bu çalışmada; defne yaprağı (Laurus nobilis) su özütü kullanılarak biyosentez yöntemi ile SiCl@AgNP nanokompozit sentezlenmiştir. Üretilmiş olan nanokompozitin yapısı UV-Vis., FTIR, XRD ve SEM teknikleri ile karakterize edilmiştir. Daha sonra üretilmiş olan nanokompozit adsorbent, sulu çözeltiden bir katyonik boyar madde olan metilen mavisinin (MM) gideriminde değerlendirilmiştir. İlk olarak adsorpsiyon sürecine etki edebilecek parametrelerden, çözelti pH'ı, başlangıç MM konsantrasyonu, temas süresi, adsorbent dozu ve ortam sıcaklığının etkisi incelenmiştir. Deneysel verilerin Langmuir, Freundlich ve D-R izotermlerine uygunluğu analiz edilmiş ve Langmuir izoterm modeli ile uyum sağladığı gözlemlenmiştir. Gibbs serbest enerjisi, entropi ve entalpi değişikliği termodinamik parametreleri hesaplanmış ve elde edilen değerler MM adsorpsiyonunun uygulanabilirliğini ve endotermik karakterli olduğunu göstermiştir. Biyosentez yöntemi ile üretilmiş olan düşük maliyetli SiCl@AgNP nanokompozitinin sulu çözeltiden MM boyar madde gideriminde etkili bir adsorbent olduğu belirlenmiştir. Ayrıca üretilmiş olan nanokompozit adsorbentin diğer katyonik boyar maddelerin gideriminde de kullanılabileceği önerilmiştir.

Anahtar Kelimeler

• biyosentez
• defne yaprağı
• nanokompozit
• metilen mavisi
• giderim

Kaynakça

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