Ağır metallerin giderimi için düşük maliyetli adsorban olarak pirina kullanımı

Son yıllarda düşük maliyetli tarımsal atıklar kullanılarak ağır metallerin sulardan uzaklaştırılması çalışmalarıhız kazanmıştır. Zeytinyağı endüstrisi atığı olan pirinanın (zeytin posası) adsorban olarak kullanılmasıyla sularda çözünmüş Cr(VI) ve Cu(II) ağır metallerinin giderimi araştırılmıştır. Deneysel adsorpsiyon prosesinde, sıcaklık (20oC), adsorban dozu (0,5 g) ve partikül boyutu (0,5-2,0 mm) sabit tutularak; giderim verimine pH , temas süresi (2-120 dk) ve başlangıç ağır metal konsantrasyonlarının (5-100 mg/L) etkileri incelenmiştir. pH 4, temas süresi 15 dk ve başlangıç ağır metal konsantrasyonu 5 mg/L'deaktifleştirilmiş pirina (AP) kullanılarak Cr(VI) ve Cu(II) maksimum giderimleri %98,8 ve %93,2 olarak elde edilmiştir. Bu sonuçlar doğrultusunda Cr(VI) ve Cu(II) için adsorplanma kapasiteleri 0,988 mg/g ve 0,932mg/g olarak tespit edilmiştir. Bu ön çalışmanın ardından aynı optimum şartlar akü sanayi atıksuyuna dauygulanmış olup, yüksek giderim verimleri elde edilmiştir. Ayrıca, optimum koşullarda kinetik ve izotermmodelleri uygulanmış olup; deneysel sonuçlar ile yalancı ikinci derece kinetik ve Langmuir izotermmodellerindeki teorik sonuçlar arasında iyi bir uyum gözlenmiştir. FTIR analizi ile çeşitli fonksiyonel gruplar tanımlanmış ve SEM görüntüleri AP'nin gözenekli yapıya sahip olduğunu göstermiştir. Çalışmasonuçları, adsorpsiyon uygulamalarında AP'nin düşük maliyetli adsorban olarak çeşitli alanlarda kullanıma uygunluğunu ispatlamıştır.

Olive pomace as a low-cost adsorbent for the removal heavy metals

In recent years, the removal of heavy metals from water by using low-cost agricultural waste activities wereaccelerated. Removal of dissolved Cr(VI) and Cu(II) heavy metals in water by olive pomace which olive oilindustry waste was investigated. The parameters that affect the heavy metal adsorption such as pH , contact time (2-120 min.), and initial heavy metal concentrations (5-100 mg/L) were studied in batch experiments at a temperature of 20oC, 0.5 g adsorbent dose and, particle size of between 0.5 and 2.0 mm. The maximum removal efficiencies were obtained 98.8% and 93.2% for Cr(VI) and Cu(II), respectively byusing activated olive pomace (AP), at a pH 4, contact time of 15 min. and initial heavy metal concentrationof 5 mg/L. The maximum adsorption capacity was determined 0.988 and 0.932 mg/g onto AP for Cr(VI) andCu(II), respectively. Following this preliminary study, the same optimum conditions were applied to thebattery industry wastewater and high removal efficiency was obtained. Moreover, kinetic and isotherm studies were carried out by applying pseudo second order kinetic and Langmuir isotherm model, observinggood agreement between theoretical and experimental results at the optimum operation conditions. Variousactive functional groups were identified by FTIR analysis and SEM images showed that the AP has a porousstructure. The study results show that AP has proven its suitability for use in various fields as a low-cost adsorbent in adsorption.

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