Doğal Kil Minerali Beydellit İle Sulu Çözeltilerden Co (II) Adsorpsiyonu

Bu çalışmada, doğal kil minerali olan beydellit kullanılarak atıksulardan kobalt giderimi araştırılmıştır. Kobalt adsorbsiyon kapasitesi için beydellit dozajı (0.2-20 g/l), başlangıç Co (II) konsantrasyonu (501000 mg/l), sıcaklık (293-333 0K) ve çözelti pH değerleri 2-7 çalışılmıştır. En yüksek adsorbsiyon pH 6-7 aralığında gözlenmiştir. 100 dakika temas süresi, pH 7 ve 50-400 mg/l kobalt konsantrasyonunda sırası ile % 99,5-86,8 giderme verimi bulunmuştur. Kinetik verilerden farklı başlangıç kobalt (II) konsantrasyonlarında (50-1000 mg/l) adsorbsiyonun hızlı ve 40 dakikada tamamlandığı ve daha sonra dengeye geldiği tespit edilmiştir. Verilerin yalancı ikinci mertebe modele yüksek korelasyon katsayıları ile uyduğu görülmüştür (r2>0.985). pH 7 ve 50-1000 mg/l de Co (II) adsorbsiyon kapasitesi Langmuir izoterminden 21,13 mg/g olarak hesaplanmıştır. Entalpi?Ho), serbest enerji(?(? Go) ve entropi ?So) gibi termodinamik parametreler 283-333 0K arasında sırası ile -2.01, 7.27-8.31 ve 0.031 (So) gibi termodinamik parametreler 283-333 0K arasında sırası ile -2.01, 7.27-8.31 ve 0.031 kJ/mol oK olarak hesaplanmıştır. Bu sonuçlar göre beydellit üzerine Co (II) üzerine adsorbsiyonu endotermik bir proses olup adsorpsiyon yüksek sıcaklıkta daha iyi sonuç vermiştir. Bu çalışma göstermiştir ki doğal kil minerali beydellit atıksulardan kobalt gideriminde etkili bir adsorbenttir.

Adsorption of Co (II) from aqueous solution by Natural clay mineral Beidellite

In this study, removal of cobalt from wastewater using natural clay (beidellite) was investigated. The adsorption capacity of cobalt was studied at beidellite dosages (0.20-20 g/L), initial Co(II) concentrations (50-1000 mg/L), temperature (293-333 0K) and solution pH values . Maximum adsorption was observed at the pH range of 6-7.With an initial concentration of 50 and 400 mg/L of the adsorbate at pH 7.0 and contact time of 100 min, the percentage adsorptions were found to be 99.5% and 86.8%, respectively. The kinetic data obtained at different initial Co(II) concentrations (501000 mg/L) indicated that adsorption rate was fast and most of the process was completed within 40 min, followed by slow attainment of equilibrium. Pseudo-second order model fitted the data well with very high correlation coefficients (r2>0.985). Adsorption capacities was calculated from the Langmuir isotherm as 21.13 mg/g at an initial pH of 7 for the 50-1000 mg Co(II)/L solution. Thermodynamic parameters such as enthalpy ?Ho), free energy (?(? Go) and entropy (?So) were calculated as 2.01, 7.27-8.31, and 0.031 kJ/mol oK between 293-333 oK, respectively. These results show that adsorption of Co(II) on beidellite was an endothermic process and the process of adsorption was favoured at high temperatures. The present study revealed that such a natural clay material beidellite could be used as an efficient sorbent for the removal of cobalt from wastewater streams.

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