Agro-Endüstriyel Yan Ürün Adsorbentler ile Sulardan Kurşun (II) Giderilmesi
Bu çalışmada, Pb(II) iyonlarının, asit ve/veya baz ile aktive edilmiş ceviz ve limon kabuğu gibi adsorbentler ile adsorpsiyonu kesikli çalışan bir adsorpsiyon sisteminde gerçekleştirilmiştir. Orijinal ve aktive edilmiş adsorbentler SEM-EDS ve FTIR analizleri ile karakterize edilmiştir. Her iki adsorbentin SEM fotoğraflarında, aktivasyondan önce düzensiz şekilli ve tabakalı yapıların varlığı gözlenirken, aktivasyondan sonra daha gözenekli ve kıvrımlı yüzeylerin oluştuğu görülmüştür. Adsorpsiyon çalışmaları, aktivasyonun adsorpsiyon veriminin artışında etkili olduğunu ve kurşun iyonlarının % 50’sinden daha büyük bir kısmının ilk 10 dakika içerisinde giderildiğini, 180 dakikada ise dengeye ulaşıldığını göstermiştir. Ayrıca, adsorpsiyon çalışmaları adsorpsiyon hızının yalancı ikinci dereceden kinetik modeli ile tanımlanabileceğini de göstermiştir. Freundlich ve Langmuir izoterm modelleri de WS-NaOH ve LP-HNO3 adsorbanları üzerindeki Pb (II) iyonlarının adsorpsiyonunu tanımlamak için uygulanmış ve denge verilerinin Freundlich modeline daha uygun olduğu bulunmuştur.
Removal of Lead (II) from Water by Agro-Industrial by-Products Adsorbent
Pb(II) adsorption from the water using adsorbents such as acid and/orbase activated walnut shell and lemon peel was carried out in a continuous stirringbatch system. The original and activated adsorbents were characterized by SEMEDSand FTIR analyses. SEM photographs of both adsorbents showed that whilethe presence of irregularly shaped and layered structures were observed beforeactivation, more porous and curved surfaces were observed after activation.Adsorption studies showed that the activation was effective for increasing theadsorption efficiency and while more than 50% of the lead ions were removed atthe first 10 min, the equilibrium was reached at 180 min. Furthermore, theyshowed that the adsorption rate was determined by a pseudo second order kineticmodel. Additionally, Freundlich and Langmuir isotherm models were investigatedfor Pb(II) adsorption on WS-NaOH and LP-HNO3 adsorbents and it was found thatthe equilibrium data were more suitable for Freundlich model.
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